JP2009011086A - Armature for axial gap type rotating electrical machines - Google Patents

Abstract

[PROBLEMS] To suppress the eddy current in the tooth part and improve the shape flexibility of the tooth part, and to form as many parts as possible with laminated steel sheets and reduce the use part of the dust core as much as possible at a relatively low rotational speed. Even when a large torque is required, the iron loss should be reduced and the copper loss should be reduced, and the back yoke should be arranged in a space-efficient manner with excellent strength.
SOLUTION: A plurality of teeth portions 40 each having a back yoke 34 formed of a laminated steel plate, a dust core portion 42, and a pair of laminated core portions 46 disposed so as to sandwich the dust core portion 42. And a coil portion 50 wound around the plurality of teeth portions 40. The plurality of teeth portions 40 are embedded and fixed in the back yoke 34 so as to protrude from the back yoke 34 around the rotation shaft 18a. The outer diameter of each of the plurality of tooth portions 40 is at least as large as the winding thickness of the coil portion 50 than the outer diameter of a circle connecting the outer periphery of the coil winding portion.
[Selection] Figure 1

Description

  The present invention relates to an armature applied to an axial gap type rotating electric machine.

  Conventionally, as a motor, there is an axial gap type motor in which a surface where a rotor and a stator face each other is arranged along a plane orthogonal to a shaft.

  As such an axial gap type motor, there is one using a core in which thin plates (electromagnetic steel plates) orthogonal to the shaft are laminated in the axial direction.

  However, in the case of using a core in which thin plates (electromagnetic steel plates) perpendicular to the shaft are laminated in the axial direction, especially in the teeth and the vicinity thereof, the lamination direction and the flow of magnetic flux are parallel, so eddy currents are There is a problem that occurs frequently. Moreover, since the teeth are formed of laminated steel sheets, there is a problem that there are large restrictions on the shape of the teeth.

  Therefore, as disclosed in Patent Document 1, a tooth portion is formed by combining a dust core and a laminated steel plate, and a yoke is constituted by the dust core and the base end portion of the laminated steel plate. There is also.

JP 2006-345672 A

  However, in the technique disclosed in Patent Document 1, when the yoke is formed by the dust core forming the tooth portion and the base end portion of the laminated steel plate, the shape of the laminated steel plate is greatly limited, so the diameter of the armature core In the direction, it is difficult to make the length of the yoke constituent portion of the laminated steel plates longer than the length of the teeth. Then, the yoke cannot be disposed at a portion corresponding to the coil wound around the teeth, and the yoke cannot be disposed efficiently.

  In addition, the yoke has a problem in that the strength of the yoke is inferior because the dust core portion and the laminated steel plate portion are simply arranged in the circumferential direction. For example, it becomes difficult to use as a member for fixing to a housing.

  Here, a core is proposed in which a back yoke made of laminated steel plates is combined with teeth made of a dust core. However, as magnetic characteristics of the dust core, hysteresis loss is still large and saturation magnetic flux density is low. For this reason, for example, when generating a large torque using a permanent magnet with a large energy product such as a rare earth magnet, or when high-speed rotation is not particularly required (for example, the drive frequency is lower than 1 kHz to 5 kHz) In the case of (case), sufficient characteristics may not be obtained with the configuration in which the entire tooth is a dust core.

  Therefore, the present invention aims to suppress the eddy current at the tooth part and improve the shape flexibility of the tooth part, while forming as many parts as possible with laminated steel sheets and reducing the use part of the dust core as much as possible. It is an object of the present invention to achieve low iron loss and low copper loss even when a high torque is required at a rotational speed, and to make it possible to dispose the back yoke in a space efficient manner and to have excellent strength.

  In order to solve the above problem, an armature for an axial gap type rotating electrical machine according to the first aspect is provided with an armature for an axial gap type rotating electrical machine (30, 130, 230, 330, 430) having a rotating shaft (18a). 430B), which is formed of a laminated steel plate in which thin plates are laminated along the direction of the rotation axis, and a substantially disk-shaped back yoke (34, 134, 234) having a main surface substantially perpendicular to the rotation axis. 334, 434, 434B), a dust core portion (42, 42C, 42D, 42E, 142, 242, 342, 342B, 442) formed of a dust core, and a thin plate having substantially the same shape as the back yoke A pair of laminated core portions (46, 46B, 46D, 46E, 146, 24) disposed so as to sandwich the dust core portion in the direction around the rotation axis. 346, 346B, 446) and a plurality of teeth portions (40, 40B, 40C, 40D, 40E, 140, 240, 340, 340B, 440), and coil portions wound around the plurality of teeth portions ( 50), and the plurality of teeth portions are embedded and fixed in the back yoke so as to protrude from the main surface of the back yoke around the rotation axis, and the outer diameter of the back yoke has the plurality of teeth The coil portion is larger by at least the winding thickness of the coil portion than the outer diameter of the circle connecting the outer periphery of the coil winding portion.

  An armature for an axial gap type rotating electrical machine according to a second aspect is the armature for an axial gap type rotating electrical machine according to the first aspect, wherein each tooth portion is provided at a tip portion of each laminated core portion. A flange forming portion (47) projecting outward is formed.

  An armature for an axial gap type rotating electrical machine according to a third aspect is the armature for an axial gap type rotating electrical machine according to the first or 22nd aspect, wherein each of the armatures adjacent to each other in the direction around the rotation axis is provided. Of the teeth (40, 40B, 40C, 40D, 40E, 140, 240, 340, 340B), the portion of the back yoke (34, 134, 234, 334) is interposed between the portions embedded in the back yoke. It is what you are doing.

  An armature for an axial gap type rotating electrical machine according to a fourth aspect is the armature for an axial gap type rotating electrical machine according to any one of the first to third aspects, and each of the tooth portions (40, 40B). , 40C, 40D, 40E, 140, 240, 340, 340B, 440) includes a pair of side surfaces (42a) extending so as to expand from the inner peripheral side to the outer peripheral side of the back yoke, and the pair of side surfaces. A dust core portion (42, 42C, 42D, 42E, 142, 242, 342, 342B, 442) having a portion surrounded by an outer peripheral side surface (42b) connected on the outer peripheral side of the back yoke, Laminated core portions (46, 46B, 46D, 46E, 146, 246, 346, 346B, 446) are respectively disposed along a pair of side surfaces of the dust core portion.

  An armature for an axial gap type rotating electrical machine according to a fifth aspect is the armature for an axial gap type rotating electrical machine according to the fourth aspect, and each of the tooth portions (40, 40B, 40C, 40D, 40E). 140, 240, 340, 340B, 440), the side surfaces (40a) adjacent to each other around the rotation axis are substantially parallel to each other.

  An armature for an axial gap type rotating electrical machine according to a sixth aspect is the armature for an axial gap type rotating electrical machine according to the fourth or fifth aspect, wherein the tooth portions (40B, 40C) are each of the armatures. The pair of laminated core portions (46B) are obtained by laminating a plurality of thin plates so as to substantially overlap each other along a direction substantially orthogonal to the thin plates.

  An armature for an axial gap type rotating electrical machine according to a seventh aspect is the armature for an axial gap type rotating electrical machine according to the sixth aspect, wherein the dust core portion (40C) of each tooth portion (40C) 42C) has an embedded powder core portion (42Ca) that fills the recesses between the end faces of the pair of laminated core portions.

  An armature for an axial gap type rotating electrical machine according to an eighth aspect is the armature for an axial gap type rotating electrical machine according to the fourth or fifth aspect, wherein the pair of teeth portions (40) is a pair of the armatures. The end surfaces of the laminated core portion (46) are disposed on substantially the same plane on the inner peripheral side and the outer peripheral side of the back yoke.

  An armature for an axial gap type rotating electrical machine according to a ninth aspect is the armature for an axial gap type rotating electrical machine according to the fourth or fifth aspect, wherein the tooth portions (40D, 40E) are each of the armatures. Of the pair of laminated core portions (46D, 46E), the back yoke outer peripheral side outward corner portion (46Da, 46Ea) forms a substantially right angle or an obtuse angle. The stacking direction of the outer peripheral side portion is set inward from the stacking direction of the inner peripheral side portion of the back yoke.

  An armature for an axial gap type rotating electrical machine according to a tenth aspect is the armature for an axial gap type rotating electrical machine according to the ninth aspect, wherein the pair of laminated core portions of each tooth portion (40E) is provided. The pair of laminated cores of each of the teeth portions so that the back yoke outer peripheral side outward corner portion (46Ea) and the back yoke inner peripheral side outward corner portion (46Eb) form substantially the same obtuse angle in (46E). The stacking direction of the back yoke outer peripheral part of the portion is set inward from the stacking direction of the back yoke inner peripheral part.

  An armature for an axial gap type rotating electric machine according to an eleventh aspect is the armature for an axial gap type rotating electric machine according to any one of the first to tenth aspects, wherein each of the tooth portions (140, 240) is provided. 340, 340B) are provided with drop prevention portions (146p, 242p, 346p) for preventing the teeth portions from coming off in the protruding direction from the back yoke (134, 234, 334).

  An armature for an axial gap type rotating electrical machine according to a twelfth aspect is the armature for an axial gap type rotating electrical machine according to the eleventh aspect, wherein the drop prevention portions (146p, 346p) It is provided in the core part (146, 346B).

  An armature for an axial gap type rotating electrical machine according to a thirteenth aspect is an armature for an axial gap type rotating electrical machine according to the twelfth aspect, wherein the back yoke (134) has a tooth portion fixing hole ( 136) is formed, and the pair of laminated core portions (146) is inserted into the teeth portion fixing hole portion along the rotational axis direction, and the dust core portion ( 142) is inserted into the tooth portion fixing hole portion so as to prevent it from coming off.

  An armature for an axial gap type rotating electric machine according to a fourteenth aspect is the armature for an axial gap type rotating electric machine according to the twelfth aspect, wherein the teeth are formed along the radial direction of the back yoke (334). A groove fixing hole portion (336) is formed, and the pair of laminated core portions (346B) and the dust core portion (342B) are formed on the teeth fixing groove hole portion from the outer peripheral side of the back yoke. When the pair of laminated core portions are inserted and prevented from coming off from the back yoke in the protruding direction of the teeth portions, the removal preventing portions (346p) are formed in the teeth portion fixing groove-like hole portions. To engage.

  An armature for an axial gap type rotating electric machine according to a fifteenth aspect is the armature for an axial gap type rotating electric machine according to the eleventh aspect, wherein the drop prevention portion (242p,) It is provided in the core part (242, 342).

  An armature for an axial gap type rotating electrical machine according to a sixteenth aspect is the armature for an axial gap type rotating electrical machine according to the fifteenth aspect, wherein the back yoke (234) has a tooth portion fixing hole ( 236) is formed, and the powder core portion (242) is inserted into the teeth portion fixing hole portion along the rotational axis direction from the opposite side to the protruding direction of the teeth portion, thereby preventing the removal preventing portion. (242p) is engaged with the teeth portion fixing hole portion in a retaining manner.

  An armature for an axial gap type rotating electric machine according to a seventeenth aspect is the armature for an axial gap type rotating electric machine according to the fifteenth aspect, wherein teeth are formed along the radial direction of the back yoke (334). A groove fixing hole portion (336) is formed, and the dust core portion (342) is inserted into the teeth fixing groove hole portion from the outer periphery side of the back yoke, and the teeth are inserted from the back yoke. In the aspect in which the part is prevented from coming off in the protruding direction, the come-off prevention part (242p) is engaged with the groove part for fixing the tooth part.

  An armature for an axial gap type rotating electrical machine according to an eighteenth aspect is an armature for an axial gap type rotating electrical machine according to any one of the first to seventeenth aspects, and includes the dust core portion and the armature. Each of the pair of laminated core portions disposed so as to be sandwiched is provided with a misalignment prevention portion (242q, 246g) that prevents mutual misalignment.

  An armature for an axial gap type rotating electric machine according to a nineteenth aspect is an armature for an axial gap type rotating electric machine according to any one of the first to eighteenth aspects, and includes the dust core portion and the armature. The pair of laminated core portions arranged so as to be sandwiched are maintained in the combined state by the coil portion (50) wound around them.

  An armature for an axial gap type rotating electrical machine according to a twentieth aspect is the armature for an axial gap type rotating electrical machine according to any one of the first to nineteenth aspects, wherein each of the dust core portions (342) is provided. , 342B), the portion embedded in the back yoke (334) protrudes toward the outer periphery of the back yoke from the portion protruding from the back yoke.

  An armature for an axial gap type rotating electrical machine according to a twenty-first aspect is the armature for an axial gap type rotating electrical machine according to the twentieth aspect, wherein the armature for the dust core portion (342, 342B) The end of the portion embedded in the back yoke (334) and projecting toward the outer periphery of the back yoke is located on the outer peripheral surface of the back yoke.

  An armature for an axial gap type rotating electrical machine according to a twenty-second aspect is the armature for an axial gap type rotating electrical machine according to the twenty-first aspect, wherein an annular frame (338) is provided outside the back yoke. It has been fitted.

  According to the armature for an axial gap type rotating electrical machine according to the first embodiment, the teeth portion includes a dust core portion formed of a dust core and a thin plate having substantially the same shape along the substantially radial direction of the back yoke. And a pair of laminated core parts arranged so as to sandwich the dust core part in the direction around the rotation axis, and therefore, the eddy current suppression of the tooth part is intended at the laminated core part. In addition, the shape flexibility of the tooth portion can be improved at the portion of the powder core portion. In addition, since the teeth part is partially composed of a laminated core part and the back yoke is formed of a laminated steel sheet, as many parts as possible are formed of the laminated steel sheet and the use part of the dust core is reduced as much as possible. Even when a relatively low rotational speed and a large torque are required, a low iron loss and a low copper loss can be achieved. Further, each tooth portion is embedded and fixed in the back yoke, and the outer diameter of the back yoke is at least wound around the outer circumference of a circle connecting the outer circumferences of the coil winding portions of the plurality of tooth portions. Since the thickness is increased, the back yoke can be disposed in a space-efficient manner at a portion corresponding to the coil portion. In addition, since the back yoke is composed of laminated steel plates, it can have excellent strength.

  As in the second aspect, when a brim forming portion is formed at the tip of each laminated core portion so as to project outward from each tooth portion, the area facing the field element is increased. Thus, the flux linkage can be increased.

  According to the 3rd aspect, since the part of the said back yoke is interposing between the parts embed | buried under the said back yoke among each said teeth part adjacent in the direction of the periphery of a rotating shaft, it is excellent in intensity | strength.

  According to the fourth aspect, the dust core portion has a pair of side surfaces extending so as to expand from the inner peripheral side to the outer peripheral side of the back yoke, and the pair of laminated core portions are respectively arranged along the pair of side surfaces. Therefore, the side surface of each tooth portion can be formed so as to extend from the inner peripheral side to the outer peripheral side of the back yoke, and each tooth portion can be arranged in a space-efficient manner. it can.

  Further, according to the fifth aspect, when the side surfaces adjacent to each other around the rotation axis among the tooth portions are substantially parallel to each other, the coil portions can be efficiently disposed between the tooth portions, The winding space factor and the cross-sectional area of the tooth portion can be sufficiently secured.

  According to the sixth aspect, the pair of laminated core portions of each of the tooth portions are laminated such that a plurality of thin plates overlap each other substantially along a direction substantially orthogonal to the thin plates. Therefore, the laminated core part can be easily manufactured.

  According to the 7th aspect, the recessed part of each teeth part can be filled with the embedding compacting core part, and the clearance gap between each teeth part and the coil part wound around it can be suppressed.

  According to the eighth aspect, since the end surfaces of the pair of laminated core portions of each tooth portion are disposed on substantially the same plane on the inner peripheral side and the outer peripheral side of the back yoke, It is possible to eliminate the dent at the portion, and to suppress a gap between each tooth portion and the coil portion wound around the tooth portion.

  According to the 9th aspect, since the said back yoke outer peripheral side outward corner part has comprised a substantially right angle or an obtuse angle among the pair of lamination | stacking core parts of each said tooth part, it was wound by the teeth part. The coil thickness can be suppressed.

  According to the tenth aspect, the back yoke outer peripheral side outward corner portion and the back yoke inner peripheral side outward corner portion of the pair of laminated core portions of each of the teeth portions form substantially the same obtuse angle. The coil thickness of the coil part wound around the teeth part can be suppressed.

  According to the eleventh aspect, the teeth portions are provided with the prevention portions that prevent the teeth portions from coming off in the projecting direction from the back yoke, so that the teeth portions can be prevented from coming off.

  According to the twelfth aspect, the teeth part can be prevented from coming off by the coming-out preventing part provided in each laminated core part.

  According to the thirteenth aspect, the dust core portion is inserted between the pair of laminated core portions in a state where the pair of laminated core portions are inserted in the teeth portion fixing hole portions along the rotation axis direction. As a result, the removal preventing portion engages with the teeth portion fixing hole portion in a retaining manner, so that the teeth portion can be easily and reliably retained.

  According to the fourteenth aspect, the pair of laminated core portions and the dust core portion are inserted into the teeth portion fixing groove-like hole portions from the outer peripheral side of the back yoke, and the pair of laminated core portions are the back. Since the teeth prevention portion engages with the teeth portion fixing groove-like hole portion in a manner in which the teeth portion is prevented from coming off in the protruding direction from the yoke, the teeth portion can be easily and reliably prevented from being detached. be able to.

  According to the fifteenth aspect, the teeth portion can be prevented from coming off by the coming-off preventing portion provided in each powder core portion.

  According to the sixteenth aspect, by inserting the dust core portion into the teeth portion fixing hole portion from the side opposite to the protruding direction of the teeth portion along the rotational axis direction, the removal preventing portion is Since the teeth are fixedly engaged with the teeth fixing holes, it is possible to easily and reliably prevent the teeth from being removed.

  According to the seventeenth aspect, the dust core portion is inserted into the tooth portion fixing groove-like hole portion from the outer peripheral side of the back yoke to prevent the teeth portion from coming off in the protruding direction from the back yoke. In this manner, the removal preventing portion engages with the tooth portion fixing groove-like hole portion, so that it is possible to easily and reliably prevent the tooth portion from being removed.

  According to the eighteenth aspect, each of the dust core portion and the pair of laminated core portions disposed so as to sandwich the dust core portion is provided with a misalignment prevention portion that prevents mutual misalignment. Therefore, it is possible to prevent positional deviation between the powder core portion and the pair of laminated core portions.

  According to the 19th aspect, the united form of a compacting core part and a pair of lamination | stacking core part is maintained with the comparatively simple structure using a coil part.

  According to the twentieth aspect, the portion embedded in the back yoke in each of the dust core portions protrudes toward the outer periphery of the back yoke rather than the portion protruding from the back yoke. It is easy to prevent the powder core portion from coming off by the members disposed on the surface.

  In particular, as in the twenty-first embodiment, the end portion of each of the dust core portions that is embedded in the back yoke and protrudes toward the outer periphery of the back yoke is located on the outer peripheral surface of the back yoke. In this case, the dust core portion can be prevented from coming off by a member fitted around the outer periphery of the back yoke.

  According to the twenty-second aspect, it is possible to prevent the dust core portion from being removed by the annular frame fitted around the outer periphery of the back yoke.

{First embodiment}
Hereinafter, the armature for the axial gap type motor according to the first embodiment will be described. FIG. 1 is an exploded perspective view showing a main part of the axial gap motor, and FIG. 2 is an exploded perspective view showing an armature of the axial gap motor.

  This axial gap type motor has a predetermined rotation shaft 18a and generates a rotational force around the rotation shaft 18a, and includes a rotor 20 as a field element and a stator 30 as an armature. Yes.

  The rotor 20 includes a rotor-side back yoke 22, a plurality of permanent magnets 24, and a rotor magnetic body 26 as a field element-side magnetic body member provided on the stator 30 side of each permanent magnet 24. The rotor 20 is formed in a substantially disk shape as a whole, and is disposed on one surface side (the upper surface side in FIG. 1) of the stator 30 via a gap. The rotor 20 is connected and fixed to a shaft (not shown). This shaft penetrates the stator 30 and extends outward (downward here) and is rotatably supported by a bearing (not shown). Thus, the stator 30 is supported so as to be rotatable about the rotation shaft 18a that is the central axis of the shaft. Then, the rotational force of the rotor 20 is transmitted to the outside through the shaft. That is, this motor is an axial gap type motor in which the rotor 20 as a field element and the stator 30 as an armature face each other with a gap in the direction of the rotating shaft 18a.

  The rotor-side back yoke 22 is formed of a magnetic material such as a laminated steel plate or a dust core, is formed in a substantially disk shape, and is fixedly attached to the shaft. The rotor side back yoke 22 fixes and holds each permanent magnet 24 and contributes to demagnetization of the permanent magnet 24 and reduction of eddy current loss on the side opposite to the stator 30.

  The plurality of permanent magnets 24 are arranged in a substantially annular shape at substantially equal intervals so as to exhibit alternating magnetic poles around the rotation shaft 18 a with respect to the stator 30. Each permanent magnet 24 generates a magnetic flux along the direction of the rotation axis 18a. Here, six permanent magnets 24 are used, and the rotor 20 has six magnetic poles.

  The rotor magnetic body 26 is formed in a substantially annular plate shape as a whole, and is fixed to the stator 30 side of each permanent magnet 24. The inner peripheral portion of the rotor magnetic body 26 is on the inner peripheral side with respect to the inner peripheral portions of all the tooth portions 40, and the outer peripheral portion of the rotor magnetic body 26 is on the outer peripheral side with respect to the outer peripheral portions of all the tooth portions 40. That is, the rotor magnetic body 26 as a whole has a spread that can face the rotor 20 side end surface of each laminated core portion 46.

  The rotor magnetic body 26 is formed with slits 26 s extending in the radial direction corresponding to the spaces between the permanent magnets 24. The rotor magnetic body 26 is magnetically divided into substantially fan-shaped portions corresponding to the respective permanent magnets 24 by the slits 26s. Further, the inner peripheral end of each slit 26 s is on the inner peripheral side with respect to the inner peripheral portion of all teeth portions 40, and the outer peripheral end portion of each slit 26 s is on the outer peripheral side with respect to the outer peripheral portions of all teeth portions 40. It is preferable that it exists in.

  The rotor magnetic body 26 has a role of concentrating or expanding the magnetic flux of the permanent magnet 24 in accordance with the gap facing area of each tooth portion 40. For example, when the gap facing area of each tooth portion 40 is small, the magnetic flux of each permanent magnet 24 is concentrated on the portion where each tooth portion 40 exists, and the magnetic flux passes between each tooth portion 40 and the rotor 20 with little leakage. Have a role. However, the rotor magnetic body 26 may be omitted.

  The stator 30 has a substantially disk-like overall shape and is fixed at a fixed position in a casing (not shown). The stator 30 has a stator core 32 as an armature core, and a plurality of coil portions 50 attached to the stator core 32. The stator 30 is opposed to the rotor 20 with a gap in a posture in which each tooth portion 40 described later faces the rotor 20.

  The stator core 32 has a back yoke 34 and a plurality of tooth portions 40.

  The back yoke 34 is formed in a substantially disc shape by a laminated steel plate in which thin plates such as electromagnetic steel plates extending in a direction substantially orthogonal to the rotation shaft 18a are laminated along the direction of the rotation shaft 18a. Is substantially perpendicular to the rotating shaft 18a and is opposed to the rotor 20. The thin plates to be laminated are, for example, silicon steel plates and other thin plates made of a magnetic material such as amorphous or permalloy.

  As described above, the back yoke 34 formed of laminated steel sheets is excellent in strength and has a property that iron loss is small at a relatively low frequency (for example, about several kHz or less).

  A through-hole portion 34h that is larger than the outer diameter of the shaft and does not contact the shaft is formed at the center of the back yoke 34. You may provide the bearing which supports a shaft in this through-hole part 34h.

  The back yoke 34 has a plurality of teeth fixing holes 36 around the rotation shaft 18a. The teeth portion fixing hole portions 36 are formed at substantially equal intervals around the rotation shaft 18 a by the number of the tooth portions 40. Each tooth portion fixing hole 36 is formed in substantially the same shape as the base end portion of the tooth portion 40, and is formed so as to be embedded in the base end portion. It is formed in a trapezoidal hole shape.

  Each tooth portion fixing hole 36 may have a bottomed hole shape that does not penetrate the back yoke 34.

  However, it is desirable that the depth of each tooth portion fixing hole 36 be within a range in which the magnetic flux passing through the teeth portion 40 has an axial component. For example, if the magnetic flux density of the back yoke 34 is substantially close to the saturation region, the magnetic flux flowing between the tooth portions 40 passes through the portion of the back yoke 34 opposite to the rotor 20. Magnetic resistance is large in the thickness direction. Therefore, the depth of the tooth portion fixing hole 36 is particularly penetrated to the above range so that the magnetic flux can be sufficiently passed between each tooth portion 40 and the portion of the back yoke 34 opposite to the rotor 20. It is desirable. Further, if the teeth portion fixing hole 36 is formed in a penetrating shape, the shape of the thin plate constituting the back yoke 34 can be made one, and only one type of punching die for forming can be formed.

  In other cases (such as when the teeth portion fixing hole 36 is bottomed), the depth of the teeth portion fixing hole 36 is preferably half or more of the thickness dimension of the back yoke 34. Thereby, after the magnetic flux reaches a sufficient depth through the teeth portion 40, the magnetic flux can be passed through the back yoke 34, so that the magnetic resistance can be lowered and the iron loss can be reduced.

  In the portion of the stator core 32 excluding the protruding portion of each tooth portion 40, there is a magnetic flux that flows through the embedded portion of each tooth portion 40 and a magnetic flux that passes through the tooth portion 40 and flows to the adjacent tooth portion 40. . The latter magnetic flux passes through the back yoke 34 itself formed by the laminated steel plate.

  The plurality of teeth portions 40 are formed in a substantially columnar shape, here, a substantially trapezoidal columnar shape, and the length of the teeth portions 40 embedded in the teeth portion fixing hole portion 36 rather than the protruding dimension from the back yoke 34. It is formed in the size. Each tooth portion 40 is embedded and fixed in the back yoke 34 in a substantially annular shape around the rotation shaft 18 a so as to protrude from the main surface of the back yoke 34 facing the rotor 20. Thereby, each teeth part 40 is magnetically connected via the back yoke 34. At this time, since each tooth portion 40 is partially embedded in the back yoke 34, each tooth portion 40 can be firmly held in a fixed position, and magnetic flux is generated between each tooth portion 40 and the back yoke 34. Passed smoothly.

  Further, here, there are nine teeth portions 40, and the coil portions 50 are wound around each. In addition, since the volume ratio of the lamination | stacking core part 46 increases, the number of the teeth parts 40 increases, It is suitable.

  Here, since the base end portions of the plurality of tooth portions 40 are embedded in the tooth portion fixing hole 36 formed in the back yoke 34, the teeth portions 40 adjacent to each other in the direction around the rotation shaft 18 a are included. Between the portions embedded in the back yoke 34, a portion of the back yoke 34, that is, a portion between the fixing hole portions 36 of the back yoke 34 is interposed. However, the portion of the back yoke 34 is not necessarily interposed between the embedded portions, and such a form will be described later. Each tooth part 40 is fixed and held in the tooth part fixing hole 36 by press-fitting or adhesive fixing.

  Each tooth portion 40 includes a dust core portion 42 formed of a dust core, and a pair of laminated core portions 46 in which thin plates having substantially the same shape are laminated along the substantially radial direction of the back yoke 34. In addition, the dust core portion 42 is sandwiched between the pair of laminated core portions 46 in the direction around the rotation shaft 18a.

  The dust core portion 42 is formed of a dust core obtained by solidifying magnetic powder, preferably a dust core. The dust core portion 42 is formed in a substantially columnar shape having a height dimension capable of projecting from the back yoke 34 with the base end portion disposed in the tooth portion fixing hole 36. More specifically, the dust core portion 42 connects the pair of side surfaces 42 a extending so as to expand from the inner peripheral side of the back yoke 34 toward the outer peripheral side, and the pair of side surfaces 42 a on the outer peripheral side of the back yoke 34. It is formed in a substantially columnar shape having a portion surrounded by the outer peripheral side surface 42b. Here, the powder core part 42 is formed in a substantially isosceles triangular prism shape.

  In addition, the pair of side surfaces 42a of each dust core portion 42 are substantially parallel to each other in a relationship adjacent to each other around the rotation shaft 18a.

  As the dust core portion 42, in addition to the above-described configuration, the portion protruding from the back yoke 34 has a substantially isosceles triangular prism shape, the whole or the portion protruding from the back yoke 34 has a substantially sector-shaped column shape, the whole or The portion protruding from the back yoke 34 may have a substantially isosceles trapezoidal columnar shape.

  The laminated core portion 46 is configured by laminating thin plates having substantially the same shape which are punched or the like along the substantially radial direction of the back yoke 34, and has a substantially rectangular cross-sectional shape in a plane substantially orthogonal to the rotating shaft 18a. And a member having a substantially equal width in a direction substantially orthogonal to the stacking direction. The thin plate to be laminated may be a thin plate formed of a magnetic material such as amorphous or permalloy in addition to a silicon steel plate. These are appropriately selected according to the required characteristics. Moreover, as the laminated thin plate, a grain-oriented electrical steel sheet having an easy magnetization axis substantially coinciding with the direction of the rotation axis 18a may be used. This is because the flow of magnetic flux in the laminated core portion 46 is substantially along the direction of the rotation axis 18a. For the same reason, when a non-oriented electrical steel sheet is used as a thin plate, it is preferable to perform punching or the like so that the rolling direction is substantially coincident with the rotation shaft 18a. Moreover, it is preferable that the thin plate is an electromagnetic steel plate in which a direction with good magnetic properties is substantially parallel to the direction of the rotation axis 18a. This is because the magnetic permeability of the tooth portion 40 can be improved along the main magnetic flux passing direction, so that the tooth portion 40 can be further miniaturized and the iron loss can be reduced.

  The pair of laminated core portions 46 are disposed along the pair of side surfaces 42a of the dust core portion 42. Therefore, the extending direction of the pair of side surfaces 42a of the dust core portion 42 is almost directly laminated. This is the direction in which the outer surface of the core portion 46 (the outer surface of the tooth portion 40) extends. Note that the lamination of the thin plates along the substantially radial direction of the back yoke 34 means to exclude the lamination along the circumferential direction of the back yoke 34, and it is not necessarily accurate along the true radial direction of the back yoke 34. There is no need to be arranged. For example, the case where the thin plate is disposed along the pair of side surfaces 42 a of the dust core portion 42 is also included in the case where the thin plate is stacked along the substantially radial direction of the back yoke 34. Moreover, the laminated core part 46 should just have the component by which the thin plate of the substantially identical shape was laminated | stacked, for example, even if the thin plate of a different shape is laminated | stacked on the edge part etc. of the laminated core part 46, for example Good. Various examples of the stacking direction of the stacked core portions 46 will be described later.

  And as mentioned above, a pair of side surfaces 42a of each dust core part 42 is in a relationship adjacent to each other around the rotation shaft 18a, and is substantially parallel to each other. The side surfaces 40a adjacent to each other around the rotation shaft 18a are in a substantially parallel positional relationship.

  A flange forming portion 47 is formed at the front end of the laminated core portion 46 on the gap side so as to project outward from the teeth portion 40. Such a brim forming portion 47 can be easily formed by forming a protruding piece projecting outward at the tip of the thin plate constituting the laminated core portion 46 and laminating such thin plates. it can. Thereby, the rib formation part 47 which protrudes outward is formed in the front-end | tip of the both-sides part of the teeth part 40, and the area which each teeth part 40 opposes to the rotor 20 can be enlarged. The collar forming portion 47 has a role of increasing gap permeance between the rotor 20 and the stator 30 so that a large amount of magnetic flux from the rotor 20 is linked on the stator 30 side. Also, it has a role of preventing the coil part 50 from coming off.

  The collar forming portion 47 may be omitted. Moreover, you may form the collar of the teeth part 40 front-end | tip part in the part of the compacting core part 42. FIG. However, by forming the collar forming portion 47 with the laminated core portion 46, the protruding length of the collar can be shortened and the strength can be improved.

  The coil portion (winding) 50 is formed around the protruding portion of the tooth portion 40 from the back yoke 34, more specifically, a portion of each tooth portion 40 embedded in the back yoke 34 and a collar forming portion 47. It is wound corresponding to the part except the part. Each coil part 50 may be wound directly on the tooth part 40 or may be wound around another part and fitted on the tooth part 40. The coil unit 50 is wound around each of the tooth units 40, and a total of nine coil units 50 are provided. That is, it is set as the concentrated winding form by which the coil part 50 was wound by each of each teeth part 40. As shown in FIG.

  Here, unless otherwise specified in the present application, the coil portion (winding) 50 does not indicate each one of the conductive wires constituting the coil portion, but indicates an aspect in which the conductive wires are wound together. The same applies to the drawings. In addition, the drawing lines at the start and end of winding and their connections are also omitted in the drawings.

  Each coil unit 50 is repeatedly arranged in the order of the U phase, the V phase, and the W phase along the periphery of the rotation shaft 18a, and the three-phase coil units 50 are star-connected. Then, by supplying the current from the three-phase inverter circuit to the coil portions 50 of each phase, each coil portion 50 exemplifies, and each tooth portion 40 generates a magnetic flux along the protruding direction, and the rotor 20 Is supposed to rotate. That is, this axial gap type motor corresponds to concentrated winding 6 poles 9 slots.

  In the concentrated winding form as described above, the winding form of the coil part 50 is simple and each coil part 50 can be densely arranged without being overlapped in the direction of the rotating shaft 18a, so that the overall size of the motor can be reduced. There is an advantage that the amount of copper used as the winding can be reduced. Moreover, in the concentrated winding form, there exists an advantage that the compacting core part 42 and a pair of lamination | stacking core part 46 can be maintained in the united form by the coil part 50 wound by each teeth part 40. FIG.

  But each coil part 50 does not necessarily need to be wound by each of each teeth part 40, and may be wound by forms, such as what is called distributed winding and wave winding. That is, as the coil part 50 wound by the some teeth part 40, not only the form wound by each of each teeth part 40 but the form wound by some or more than each tooth part 40 Is also included. In addition, an insulator such as an insulating film is actually interposed between each coil part 50 and each tooth part 40, but is omitted in each figure and the following description.

  Further, the outer diameter of the back yoke 34 is set to be larger by at least the winding thickness of the coil portion 50 than the outer diameter of the circle connecting the outer periphery of the coil winding portion of the plurality of tooth portions 40. . Here, the outer diameter of the back yoke 34 refers to the outer diameter of a circle that comes into contact with the back yoke 34 from the outer peripheral side in a plane substantially orthogonal to the rotation shaft 18a. When it is formed in a radial shape, it can be grasped as the outer diameter of a circle in contact with each distal end portion of each radially extending portion from the outer peripheral side. Moreover, the circle | round | yen which connects the outer periphery of a coil winding part among the some teeth parts 40 is the part by which the coil part 50 is wound among the some tooth parts 40 in the plane substantially orthogonal to the rotating shaft 18a. On the other hand, it refers to a circle in contact with the outer periphery of the back yoke 34. Moreover, the winding thickness of the coil part 50 means the thickness of the coil part 50 with respect to the side surface 42a or the outer peripheral side surface 42b of the teeth part 40, and is determined according to the wire diameter wound, the number of windings, a winding width, etc. The Thereby, the coil part 50 wound around each tooth part 40 is disposed so as to be accommodated in the back yoke 34.

  A method for manufacturing the stator 30 and the motor will be described. First, a pair of powder core portions 42 are disposed on both sides of the laminated core portion 46 to constitute the tooth portion 40, and the coil portion 50 is mounted around each tooth portion 40. At this time, the coil may be wound directly around the tooth portion 40 or the coil portion 50 wound in advance may be externally fitted to the tooth portion 40. Thereafter, each tooth portion 40 is fitted into the tooth portion fixing hole 36 of the back yoke 34. At this time, if the teeth portions 40 are fitted in the teeth portion fixing hole 36 so as to be aligned on the same plane with respect to the gap facing surface of the teeth portions 40, the gap accuracy is improved. . Thereby, the stator 30 is manufactured.

  Thereafter, the stator 30 is fixed at a fixed position in the casing, and the rotor 20 is rotatably incorporated in the casing, whereby an axial gap type motor is manufactured.

  According to the stator 30 as an armature configured as described above, the tooth portion 40 includes the dust core portion 42 and the laminated core portion 46, and therefore the vortex of the tooth portion 40 at the portion of the laminated core portion 46. Current suppression can be achieved, and the shape flexibility of the tooth portion 40 can be improved at the portion of the powder core portion 42. Further, in the laminated core portion 46, the saturation magnetic flux density is increased while reducing the hysteresis loss, and even when a large torque is generated at a relatively low rotational speed, low iron loss and low copper loss can be achieved.

  The improvement in the degree of freedom of shape of the tooth part 40 can be linked to, for example, an improvement in the winding space factor of the coil part 50 and an improvement in the cross-sectional area of the tooth part 40.

  That is, since the degree of freedom of shape of the teeth part 40 can be improved, the gaps between the teeth parts 40 can be formed so as to approach the substantially equal gaps. Here, the dust core portion 42 extends so as to expand from the inner peripheral side of the back yoke 34 toward the outer peripheral side, and the outer peripheral side surface that connects the pair of side surfaces 42 a to the outer peripheral side of the back yoke 34. (For example, a substantially isosceles triangular columnar portion or a substantially isosceles trapezoidal columnar portion), and a pair of laminated core portions 46 are disposed along the pair of side surfaces 42a. When the teeth portion 40 is viewed as a whole, the pair of side surfaces 40a of the teeth portion 40 are formed so as to extend from the inner peripheral side of the back yoke 34 toward the outer peripheral side. More specifically, side surfaces 40a adjacent to each other around the rotation axis 18a of each tooth portion 40 are formed so as to be substantially parallel to each other. Accordingly, a gap that is close to substantially equal width or a substantially equal width gap is formed between each tooth portion 40, and the gap is reduced when the coil portion 50 is wound around each tooth portion 40. be able to. Thereby, the winding space factor improvement of the coil part 50 and the cross-sectional area improvement of the teeth part 40 can be aimed at.

  Temporarily, if it is going to implement | achieve the said efficient shape by comprising the whole teeth part 40 by the laminated steel plate laminated | stacked on the substantially radial direction of the back yoke 34, it is necessary to make all the punching shapes of a thin plate substantially different. On the other hand, in this teeth part 40, after forming the compacting core part 42 in the said shape, it combines with the laminated core part 46 which laminated | stacked the thin plate of the substantially identical shape, and the said efficient shape is implement | achieved. Therefore, there is a great merit in terms of reducing manufacturing costs.

  In addition, the magnetic flux passing through the tooth portion 40 is concentrated at the circumferential end portion around the rotation shaft 18a of the tooth portion 40 due to the armature reaction, and the portion where the magnetic flux is concentrated is saturated magnetic flux density. Therefore, the saturation of the magnetic flux is effectively suppressed.

  Moreover, in the part formed in the lamination | stacking core part 46 among the teeth parts 40, since there exists a gap | interval between the coating of an electromagnetic steel plate and lamination | stacking, a magnetic flux does not flow easily along the radial direction of the back yoke 34 which is the lamination direction. However, the present tooth portion 40 has a dust core portion 42 and a laminated core portion 46, and magnetic flux easily flows along the radial direction of the back yoke 34 at the dust core portion 42. The dust core portion 42 is exposed and is in contact with the back yoke 34 on the outer peripheral side of the back yoke 34 around the base end portion of the portion 40. For this reason, the magnetic flux can easily flow along the radial direction of the back yoke 34 by the dust core portion 42, and the magnetic flux can easily flow from the teeth portion 40 to the outer peripheral side portion of the back yoke 34. For this reason, the entire radial direction of the back yoke 34 can be effectively used as a magnetic path, and the thinner back yoke 34 can realize a configuration that avoids saturation of magnetic flux, which contributes to miniaturization of the motor.

  In addition, since the tooth portion 40 is partially formed of the laminated core portion 46 and the back yoke 34 is formed of the laminated steel plate, as many portions as possible are formed of the laminated steel plate and the portion where the dust core is used is preferably as much as possible. Can be reduced. Thereby, even when a relatively low rotation and a large torque are required, the efficiency of the motor can be improved by reducing the iron loss and the copper loss. In particular, the portion of the back yoke 34 that has a high magnetic flux density and greatly affects the iron loss is formed of a laminated steel plate having a relatively low frequency (for example, about several kHz or less) and a small iron loss. More effective.

  Further, each tooth portion 40 is embedded and fixed in the back yoke 34, and the outer diameter of the back yoke 34 is at least wound by the coil portion 50 than the outer diameter of the circle connecting the outer circumferences of the coil winding portions of the plurality of tooth portions 40. Since the thickness is increased by the thickness, the back yoke 34 can be efficiently disposed in the portion corresponding to the coil portion 50. Further, since the tooth portion 40 is embedded in the back yoke 34, the portion of the back yoke 34 can be disposed on the inner peripheral side of the embedded portion of the tooth portion 40.

  Moreover, since the back yoke 34 is formed of a laminated steel plate, it is excellent in strength. Thereby, it can be set as the structure suitable also for attaching and fixing the back yoke 34 in a casing by press-fitting or shrink fitting.

  In particular, each tooth portion 40 is embedded in the tooth portion fixing hole 36 of the back yoke 34, and between the portions embedded in the back yoke 34 among the adjacent tooth portions 40 in the direction around the rotation shaft 18a, the Since the yoke 34 is interposed, the strength is further improved.

  In addition, since a brim forming portion 47 is formed at the front end portion of each laminated core portion 46 so as to protrude outward from each tooth portion 40, the area facing the rotor 20 that is a field element is increased. The flux linkage can be increased.

  Below, the lamination | stacking form in the lamination | stacking core part 46 is demonstrated more concretely.

  The example shown in FIG. 3 is a laminated form similar to that shown in FIGS. 1 and 2, and in each laminated core part 46, the thin plate is the circumferential center of the tooth part 40 (the circumferential direction with reference to the back yoke 34). Are disposed in a posture substantially orthogonal to the radial direction of the back yoke 34 passing through the center of the back yoke 34, and are stacked along a pair of side surfaces of the dust core portion 42 of the tooth portion 40. In this case, in each laminated core part 46, each thin plate is laminated | stacked, shifting sequentially toward the outer side of the compacting core part 42 toward the outer peripheral side from an inner peripheral side. The end surfaces of the pair of laminated core portions 46 are arranged on substantially the same plane on each of the inner peripheral side and the outer peripheral side of the back yoke 34. In addition, the lamination | stacking of the above thin plates can be implement | achieved using the lamination | stacking structure and the crimping structure etc. which are known when using a skew in the rotor core of a radial gap type motor, for example.

  In the example shown in FIG. 3, the end surfaces of the pair of laminated core portions 46 are disposed on substantially the same plane on the inner peripheral side and the outer peripheral side of the back yoke 34, so that the recesses in the teeth portion 40 are formed. The gap between the tooth part 40 and the coil part 50 wound around the tooth part 40 can be suppressed.

  In the tooth part 40B shown in FIG. 4, in the laminated core part 46B corresponding to each laminated core part 46, the thin plate is disposed in a substantially vertical posture on the side surface 42a of the dust core part 42, respectively. Are stacked along a pair of side surfaces. That is, in this example, in each laminated core portion 46B, a plurality of thin plates are laminated so as to substantially overlap each other along a direction substantially orthogonal to the thin plates.

  In the example shown in FIG. 4, a plurality of thin plates need only be stacked without shifting, so that they can be easily stacked and a crimped structure can be applied to maintain the stacked form.

  In the example shown in FIG. 4, in each laminated core portion 46 </ b> B, the thin plate is disposed in a substantially vertical posture on the side surface 42 a of the dust core portion 42, so that a recess is generated on the inner peripheral side of the tooth portion 40. . Since such a dent is very small, there is no major problem even if it is filled with an insulator (insulator) or the like.

  However, like the tooth part 40C shown in FIG. 5, as the powder core part 42C corresponding to the powder core part 42, the shape having the embedded powder core part 42Ca as a substantially triangular prism shaped part that fills the recess. Use a good one. Thereby, the teeth part 40C as a whole can be formed into a shape with few dents, here a substantially isosceles trapezoidal columnar shape, and the gap between the tooth part 40C and the coil part 50 wound around it can be suppressed. .

  In the tooth portion 40D shown in FIG. 6, the outwardly facing corner portion 46Da on the outer peripheral side of the back yoke 34 of the pair of laminated core portions 46D corresponding to the pair of laminated core portions 46 is substantially perpendicular or obtuse (here, right angle). The stacking direction of the outer peripheral side portion of the back yoke 34 of the pair of laminated core portions 46D is set inward from the stacking direction of the inner peripheral side portion of the back yoke 34. Here, the stacking direction is an arrangement direction of the thin plates, for example, a direction in which substantially the same portions of the thin plates having substantially the same shape are arranged.

  More specifically, the dust core portion 42D corresponding to the dust core portion 42 is formed in a columnar shape in which a portion near the base angle of a substantially isosceles triangular prism shape is cut at a substantially right angle with respect to the bottom side. The pair of side surfaces 42Da are formed so as to expand from the inner peripheral side to the outer peripheral side of the back yoke 34 and to extend in a substantially parallel posture on the way. In each of the pair of side surfaces 42Da, a thin plate is laminated along the extending direction thereof, so that the thin plate in the pair of laminated core portions 46D is formed on the inner periphery of the back yoke 34. The layers are stacked along the direction extending from the inner peripheral side toward the outer peripheral side, and are stacked so as to extend in the substantially parallel direction at the outer peripheral portion of the back yoke 34 by changing the stacking direction in the middle. In other words, the thin plates are stacked while sequentially shifting outward at the inner peripheral side portion of the back yoke 34 of the pair of stacked core portions 46D, and the thin plate is not shifted at the outer peripheral side portion of the back yoke 34. They are stacked so as to overlap.

  As a result, the outwardly facing corner portion 46Da on the outer periphery side of the back yoke 34 of each pair of laminated core portions 46D has a substantially right angle or an obtuse angle (here, substantially a right angle), and therefore the coil wound around the tooth portion 40D. The winding thickness of the part 50 can be suppressed.

  In addition, it is preferable that the part of each laminated core part 46D laminated | stacked while shifting on the inner peripheral side of the back yoke 34 is longer than the part laminated | stacked without shifting on the outer peripheral side of the back yoke 34. Thereby, the space factor of the teeth part 40 can be improved.

  Further, in the tooth portion 40E shown in FIG. 7, the back yoke 34 outer peripheral side outward corner portion 46Ea and the back yoke 34 inner peripheral side outward corner portion 46Eb of the pair of laminated core portions 46E corresponding to the pair of laminated core portions 46. And the stacking direction of the outer peripheral side portion of the back yoke 34 of the pair of laminated core portions 46E is set to be inward from the stacking direction of the inner peripheral side portion of the back yoke 34 so that they form substantially the same obtuse angle.

  That is, the outer peripheral side portion of the back yoke 34 of the side surface 42Ea of the dust core portion 42E corresponding to the dust core portion is inclined more inward than the example shown in FIG. Then, of the pair of laminated core portions 46E, the outer peripheral side portion of the back yoke 34 is inclined more inward than the example shown in FIG. In other words, the thin plate is laminated while sequentially shifting outward at the inner peripheral side portion of the back yoke 34 of the pair of laminated core portions 46E, and the thin plate is formed at the inner peripheral side portion of the back yoke 34. It is piled up while shifting sequentially inward at the same level as the shift amount.

  As a result, out of the pair of laminated core portions 46E of the tooth portion 40E, the outer peripheral side outward corner portion 46Ea of the back yoke 34 and the inner peripheral side outward corner portion 46Eb of the back yoke 34 form substantially the same obtuse angle. The winding thickening of the coil part 50 wound by the part 40E can be suppressed more effectively.

  Moreover, the extent of the roll thickness suppressed by the outer peripheral side and inner peripheral side of the teeth part 40D can be made substantially equivalent.

  4 to 7, when stacking while shifting the thin plates, the stacking direction of the thin plates is (180 degrees / N) degrees (where N is the number of teeth portions) with respect to the radial direction of the back yoke 34. The direction should be shifted by an angle.

{Second Embodiment}
By the way, in the said embodiment, the removal of the teeth part 40 can be prevented by providing the teeth part 40 with the removal prevention part which prevents the teeth 40 from coming off from the back yoke 34 in the protruding direction.

  In the following second to fourth embodiments, a configuration for preventing the teeth portion from coming off will be described. In each embodiment, the same components as those described above are denoted by the same reference numerals and description thereof is omitted.

  In addition, as a structure which provides the prevention part in a teeth part, the structure which provides a prevention part in a lamination | stacking core part, and the structure which provides a prevention part in a powder core part are assumed. Any of the embodiments can prevent the teeth from coming off. Each more specific configuration will be described in the following embodiments.

  First, in the second embodiment, a configuration in which a stacking prevention part is provided in the laminated core part will be described. FIG. 8 is a perspective view for explaining the stator according to the present embodiment, FIGS. 9 and 10 are exploded perspective views of the stator, and FIG. 11 is a perspective view showing a state during the assembly of the stator.

  The stator 130 includes a back yoke 134 corresponding to the back yoke 34 and a plurality of tooth portions 140 (only one is shown in the figure) corresponding to the tooth portions 40.

  The teeth portion fixing hole 136 formed in the back yoke 134 is formed in a through hole shape into which the proximal end portion of the teeth portion 140 can be inserted. Further, a pair of side surfaces 137 of the teeth portion fixing hole 136 along the substantially radial direction of the back yoke 134, and at the edge opposite to the protruding direction of the teeth portion 140, the length of the side surface 137 is set. A groove-shaped tooth portion fixing groove portion 137g extending along the direction is formed.

  In addition, the tooth part 140 includes a powder core part 142 and a pair of laminated core parts 146.

  A protruding portion that can be fitted into the tooth portion fixing groove portion 137g along the extending direction of the edge portion of the outer surface 146a of the pair of laminated core portions 146 along the extending direction of the edge portion thereof on the opposite side to the protruding direction of the teeth portion 140. 146p is formed. The protruding portion 146p is a drop prevention portion. Then, when the pair of laminated core portions 146 are inserted into the teeth portion fixing hole 136 along the rotation axis 18a from the side opposite to the protruding direction of the teeth portion 140 in the back yoke 134, the protruding portion 146p is formed. The teeth are fixedly engaged with the teeth fixing groove 137g of the back yoke 134. Here, the width of the protruding portion 146p needs to be such that the pair of laminated core portions 146 are brought close to each other and pass through the inside of the teeth portion fixing hole 136 and the coil portion 50.

  Further, the dust core 142 has a substantially columnar shape in which a substantially isosceles triangular prism-shaped outer peripheral side surface is projected in a substantially V shape toward the outer peripheral side of the back yoke 134.

  Further, a protrusion 142p extending along the extending direction of the end edge portion is formed on the edge portion of the pair of side surfaces 142a of the powder core portion 142 opposite to the protruding direction of the tooth portion 140. Yes. In addition, a recess in which the protruding portion 142p can be fitted into the portion of the inward surface 146b of the pair of laminated core portions 146 along the extending direction of the edge portion thereof on the opposite side to the protruding direction of the teeth portion 140. A strip 146g is formed.

  The other configurations of the back yoke 134, the teeth portion 140, the laminated core portion 146, and the dust core portion 142 are the same as those of the back yoke 34, the teeth portion 40, the laminated core portion 46, and the dust core portion 42, respectively. is there.

  And as shown in FIG. 11, the coil part separately wound around the outer periphery of a pair of lamination | stacking core part 146 is arrange | positioned, and a teeth part fixation is carried out in the state which made the pair of lamination | stacking core part 146 approach in this state. The back hole 134 is inserted into the hole 136 from the opposite side to the protruding direction of the teeth 140 along the direction of the rotation shaft 18a. Then, the protrusion 146p engages with the teeth fixing groove 137g of the back yoke 134 in a retaining manner.

  In this state, the dust core portion 142 is inserted between the pair of laminated core portions 146 from the protruding direction side of the teeth portion 140 in the back yoke 134. Then, the dust core portion 142 is interposed between the pair of laminated core portions 146, and the pair of laminated core portions 146 are maintained so as to be opened to a predetermined width, and the protrusions 146p are formed on the back yoke 134. The state of engaging with the tooth portion fixing groove portion 137g in a retaining shape is maintained.

  According to the stator 130 configured as described above, by inserting the dust core portion 142 between the pair of laminated core portions 146 with the pair of laminated core portions 146 inserted into the teeth portion fixing hole 136, Since the protruding portion 146p is retained in a retaining manner in the tooth portion fixing groove portion 137g of the back yoke 134, it is possible to easily and reliably prevent the teeth portion 140 from being removed.

{Third embodiment}
In the third embodiment, a configuration in which a powder core part is provided with a drop prevention part will be described. FIG. 12 is a perspective view for explaining the stator according to the present embodiment, FIG. 13 is a perspective view seen from different directions for explaining the stator, and FIG. 14 is an exploded view for explaining the stator. FIG. 15 is a perspective view showing a state during the assembly of the stator.

  The stator 230 includes a back yoke 234 corresponding to the back yoke 34 and a tooth portion 240 corresponding to each of the tooth portions 40 (only one tooth portion 240 is shown in FIGS. 12 to 15). .

  The teeth portion fixing hole 236 formed in the back yoke 234 is formed in a through hole shape into which the proximal end portion of the teeth portion 240 can be inserted. Further, of each tooth portion fixing hole 236, a pair of side surfaces 237 along the substantially radial direction of the back yoke 234, and an edge of the teeth portion 240 opposite to the protruding direction is extended to the side surface 237. A groove-like tooth portion fixing groove portion 237g extending along the existing direction is formed.

  The teeth portion fixing hole 236 formed in the back yoke 234 is formed in a through hole shape into which the proximal end portion of the teeth portion 240 can be inserted. Further, a pair of side surfaces 237 of the tooth portion fixing hole 236 along the substantially radial direction of the back yoke 234, and on the edge opposite to the protruding direction of the teeth portion 240, the length of the side surface 237 is long. Groove-shaped teeth portion fixing groove portions 237g extending along the direction are formed.

  The teeth part 240 has a powder core part 242 and a pair of laminated core parts 246.

  The dust core portion 242 is formed of dust like the dust core portion 42, and a portion of which the portion embedded in the back yoke 234 can be fitted into the teeth portion fixing hole 236, Here, it is formed in a substantially sector shape. Further, on the outer surface of the portion embedded in the back yoke 234 in the dust core portion 242, the tooth portion extends along the extending direction of the edge portion on the portion opposite to the protruding direction of the tooth portion 240. A protrusion 242p that can be fitted into the fixing groove 237g is formed. The protruding portion 242p is a drop prevention portion. Then, the protruding portion 242p is fixed to the tooth portion by inserting the green compact core portion 242 into the tooth portion fixing hole 236 from the opposite side to the protruding direction of the tooth portion 240 along the direction of the rotation axis 18a. It engages with the teeth fixing groove 237g of the hole 236 in a protruding manner in the protruding direction.

  Further, a portion of the dust core portion 242 that protrudes from the back yoke 234, and a pair of side surfaces along the substantially radial direction of the back yoke 234, has a step portion rather than a portion embedded in the back yoke 234. It is formed on a concave side surface 242a that is recessed by one step. The pair of concave side surfaces 242a is formed with a positioning protrusion 242q extending along the radial direction of the back yoke 234 at a substantially central position in the protruding direction.

  Each laminated core portion 246 is formed of a laminated steel plate similarly to the laminated core portion 46 and has a height dimension corresponding to the protruding dimension of the teeth portion 240 from the back yoke 234. The core portion 242 has a shape that can be disposed on the concave side surface 242a portion.

  A positioning groove portion 246g extending along the radial direction of the back yoke 234 is formed on the inner surface of each laminated core portion 246 at a substantially central position in the height direction. Then, in a state where the laminated core portion 246 is disposed on the concave side surface 242a, the positioning protrusion 242q is fitted into the positioning groove portion 246g, and each laminated core portion 246 is attached to the dust core portion 242. It is positioned in the height direction. The positioning protrusion 242q and the positioning groove 246g function as a misregistration prevention unit that prevents mutual misalignment between the dust core portion 242 and the laminated core portion 246. The relationship may be reversed. In addition, you may apply this position shift prevention part to other embodiment, such as the said 1st Embodiment.

  In order to manufacture such a stator, first, as shown in FIG. 15, the dust core portion 242 is inserted into the teeth portion fixing hole 236 from the side opposite to the protruding direction of the teeth portion 240 along the direction of the rotation axis 18a. insert. Then, the protruding portion 242p engages with the teeth portion fixing groove portion 237g of the teeth portion fixing hole 236 in a retaining shape in the protruding direction.

  In this state, the pair of laminated core portions 246 are disposed on the concave side surface 242a portion of the dust core portion 242 protruding from the back yoke 234, and the protruding portions of the dust core portion 242 are formed by the pair of laminated core portions 246. Try to pinch. At this time, the positioning rib portion 242q is fitted into the positioning groove portion 246g so that the laminated core portion 246 is not displaced along the protruding direction from the dust core portion 242.

  Then, when the coil part 50 is wound around the tooth part 240 protruding from the back yoke 234, the dust core part 242 and the pair of laminated core parts 246 disposed so as to sandwich the powder core part 242 are maintained in the combined state. (See FIG. 12).

  According to the stator 230 configured as described above, the dust core portion 242 is inserted into the teeth portion fixing hole 236 along the direction of the rotation axis 18a from the side opposite to the protruding direction of the teeth portion 240, whereby dust Since the core part 242 is engaged in a retaining shape, the teeth part 240 can be easily and reliably retained.

  Further, the positioning core portion 246 is prevented from being displaced from the dust core by fitting the positioning protrusion 242q into the positioning groove portion 246g.

  Further, the coil portion 50 maintains the combined state of the dust core portion 242 and the pair of laminated core portions 246 with a relatively simple configuration.

{Fourth embodiment}
The structure which provided the prevention part in the powder core part also in 4th Embodiment is demonstrated. 16 is a perspective view showing the stator according to the present embodiment, FIG. 17 is a plan view showing the stator, FIG. 18 is an exploded perspective view of the stator, and FIGS. FIG. 22 is a schematic sectional view taken along line XXII-XXII in FIG.

  The stator 330 includes a back yoke 334 and a tooth portion 340.

  The back yoke 334 is formed of a laminated steel plate similarly to the back yoke 34, and is formed in a substantially disk shape, and a plurality of teeth portions (9 in accordance with the number of teeth portions 340) along the radial direction thereof. A fixing groove-like recess 336 is formed. Each tooth portion fixing groove-like concave portion 336 has a hole shape corresponding to the base end portion of the tooth portion 340 and opens on both sides of the back yoke 334 and also on the outer peripheral side of the back yoke 334. It is open. In addition, a pair of side surfaces 337 along the substantially radial direction of the back yoke 334 of each tooth portion fixing groove-like concave portion 336, and the side surface 337 on the edge portion opposite to the protruding direction of the teeth portion 340. A groove-shaped tooth portion fixing groove portion 337g extending along the extending direction of the groove portion is formed. Each tooth portion fixing groove-like recess 336 does not necessarily have to be opened on both sides of the back yoke 334, and may have a shape that opens only on the protruding side of the teeth portion 340.

  The teeth part 340 includes a powder core part 342 and a pair of laminated core parts 346.

  The dust core portion 342 includes a protruding portion 343a that protrudes to the outer peripheral side of the back yoke 334 relative to a portion of the teeth portion 340 that protrudes from the back yoke 334 in a portion embedded in the back yoke 334 of the dust core portion 242. It is set as the structure which formed. In addition, the protruding portion 343a is formed with a protruding portion 342p that is continuous with the protruding portion 242p.

  The embedded portion, which is the base end portion of the dust core portion 342, can be inserted into the tooth portion fixing groove-like recess 336 of the back yoke 334 from the outer peripheral side of the back yoke 334. Further, in this inserted state, the protrusions 242p and 342p of the dust core portion 342 are fitted into the teeth portion fixing groove portion 337g, and the dust core portion 342 is toothed along the rotation axis 18a with respect to the back yoke 334. The portion 340 is engaged in a state in which it is prevented from coming off in the protruding direction.

  Further, the end of the outer peripheral side portion of the back yoke 334 in the protruding portion 343 a is located on the outer peripheral surface of the back yoke 334, that is, the outer peripheral side portion of the protruding portion 343 a and the back yoke 334. The outer peripheral side portion is located on substantially the same circle. Further, by fitting a ring member 338 as an annular frame on the outer peripheral side of the back yoke 334, it is possible to prevent the dust core portion 342 from being pulled out from the teeth portion fixing groove-like concave portion 336 to the outer peripheral side. ing.

  Other configurations of the powder core portion 342 are substantially the same as those of the powder core portion 242.

  In addition, the pair of laminated core portions 346 has substantially the same configuration as the pair of laminated core portions 246.

  In assembling the stator 330, first, as shown in FIG. 19, a pair of laminated core portions 346 are disposed on the concave side surface 242 a of the dust core portion 342 to form a tooth portion 340. In this state, as shown in FIG. 21, the coil portion 50 may be wound around the protruding portion of the tooth portion 340. Thereby, the coil part 50 can be easily wound around the teeth part 340. Moreover, the dust core part 342 and the pair of laminated core parts 346 can be maintained in the combined state by the coil part 50.

  In this state, as shown in FIG. 20, the embedded portion that is the base end portion of the tooth portion 340 is inserted into the tooth portion fixing groove-like recess 336 of the back yoke 334 from the outer peripheral side of the back yoke 334. Then, the protrusions 242p and 342p of the dust core portion 342 are fitted into the teeth portion fixing groove portion 337g, and the dust core portion 342 projects from the back yoke 334 along the direction of the rotation axis 18a. Engage in a state where slipping out is prevented.

  Thereafter, when the ring member 338 is externally fitted to the outer periphery of the back yoke 334, the teeth portion 340 is held in a state in which the tooth portion 340 is prevented from coming off to the outer periphery side.

  According to the stator 330 configured as described above, the dust core portion 342 is inserted into the tooth portion fixing groove-like concave portion 336 from the outer peripheral side of the back yoke 334, and the teeth portion 340 is prevented from coming off. Since it is fixedly held in the fixing groove-like recess 336, it is possible to easily and reliably prevent the tooth portion 340 from being removed.

  Moreover, since the protrusion part 343a of the powder core part 342 exists in the outer peripheral side rather than the part which protrudes in the teeth part 340, and is located on the outer peripheral surface of the said back yoke 334, the said powder core part It is easy to hold 342 so as not to escape to the outer peripheral side of the back yoke 334. For example, the ring core 342 can be prevented from being pulled out of the teeth portion fixing groove-like recess 336 to the outer peripheral side by fitting the ring member 338 on the outer peripheral side of the back yoke 334. Here, the annular frame to be externally fitted may be a casing in which the stator 330 is fitted or a frame for fixing the stator 330. Also by these, similarly, it is possible to prevent the powder core portion 342 from being pulled out from the teeth portion fixing groove-like concave portion 336 to the outer peripheral side.

  In addition, although this embodiment demonstrated the structure by which the powder core part 342 was provided with the removal prevention part, the pair of lamination | stacking core part 346 may be provided with the prevention part.

  That is, FIG. 23 shows a modified example of the cross-sectional portion as in FIG. Like this modification, while using the powder core part 342B which omitted the protrusions 242p and 342p, the base end part of the pair of laminated core parts 346B can be embedded in the tooth part fixing groove-like concave part 336. The protrusion 346p having the same configuration as the protrusions 242p and 342p may be formed at the extended end. Then, the pair of laminated core portions 346B and the powder core portion 342B are inserted into the tooth portion fixing groove-like recesses 336 from the outer peripheral side, and the pair of laminated core portions 346B are inserted into the teeth portion fixing groove-like recesses of the back yoke 334. You may make it hold | maintain in the aspect in which the removal to the protrusion direction was prevented by 336.

  Even in the case of this modification, it is preferable that the dust core portion 342B protrudes to the outer periphery of the back yoke 334.

  Also according to this modification, the tooth portion 340B can be held on the back yoke 334 as in the above embodiment. In addition, the compacted core portion 342B and the pair of laminated core portions 346B have a configuration in which the dust core portion 342B and the pair of laminated core portions 346B are fitted into the tooth portion fixing groove-like concave portions 336 of the back yoke 334. There is an advantage that can be maintained.

{Fifth embodiment}
In the fifth embodiment, a mode in which portions embedded in the back yoke among the teeth portions are directly adjacent to each other, that is, a mode in which the back yoke portion is not interposed will be described.

  FIG. 24 is a plan view showing a stator according to the present embodiment.

  The stator 430 has a back yoke 434 and a plurality of teeth portions 440.

  The back yoke 434 has an inner peripheral annular portion 434a and an outer peripheral annular portion 434b. An inner diameter of the outer peripheral annular portion 434b is larger than an outer diameter of the inner peripheral annular portion 434a, and a plurality of teeth portions 440 can be arranged in a ring shape between the inner peripheral annular portion 434a and the outer peripheral annular portion 434b. Yes. The inner peripheral annular portion 434a and the outer peripheral annular portion 434b are each formed of a laminated steel plate in which thin plates are laminated in the direction of the rotation shaft 18a.

  Each tooth portion 440 includes a powder core portion 442 and a pair of laminated core portions 446 that sandwich the powder core portion 442. The laminated core portion 446 has the same configuration as the laminated core portion 246 according to the third embodiment, and the dust core portion 442 is the same as the dust core portion 242 according to the third embodiment except for the following configuration. It is configured.

  The difference between the dust core portion 442 and the dust core portion 242 is that a portion 443 embedded in the back yoke 434 that is the base end portion of the dust core portion 442 is greatly expanded, and a plurality of dust core portions 442 are embedded. The point is that the portion 443 is formed in a ring shape without a gap. That is, the angle (center angle) formed by the pair of side surfaces 443a extending from the inner peripheral side to the outer peripheral side of the back yoke 434 in the embedded portion 443 of the dust core portion 442 is (360 degrees / N) degrees. (Where N is the number of teeth). When a plurality of embedded portions 443 are arranged so that the pair of side surfaces 443a abut each other, an annular portion without a gap is formed.

  In manufacturing the stator 430, the pair of laminated core portions 446 are disposed so as to sandwich the protruding portion of the dust core portion 442, thereby forming the teeth portion 440. In addition, it is good to wind the coil part 50 around this teeth part 440. FIG.

  And the embedding part of the powder core part 442 among the plurality of teeth parts 440 is annularly arranged so as to be embedded between the inner peripheral annular part 434a and the outer peripheral annular part 434b disposed around the inner peripheral annular part 434a. Thus, the stator 430 can be manufactured.

  Alternatively, after the annular core portion 442 of the plurality of teeth portions 440 is annularly disposed around the outer periphery of the inner peripheral annular portion 434a, the outer peripheral annular portion 434b is externally fitted to the outer periphery. Also good. Alternatively, after the embedded portion of the dust core portion 442 of the plurality of tooth portions 440 is annularly arranged around the inner periphery of the outer peripheral annular portion 434b, the inner peripheral annular portion 434a is fitted inside the inner periphery. You may do it.

  In such a stator 430 as well, a plurality of tooth portions 440 are constituted by the main surface of the back yoke 434 around the rotation shaft 18a (the main surface of the inner peripheral annular portion 434a and the main surface of the outer peripheral annular portion 434b). It can be said that it is embedded and fixed in the back yoke 434 so as to protrude from the main surface (substantially orthogonal to the main surface). Further, when viewed as the back yoke 434 as a whole, the thin plate is formed of a laminated steel plate laminated along the direction of the rotation shaft 18a, and is formed in a substantially disk shape having a main surface substantially perpendicular to the rotation shaft 18a. You can say that. And this stator 430 can do the same effect as the said 1st Embodiment.

  In the fifth embodiment, like the stator 430B of the modified example shown in FIG. 25, it extends along the radial direction of the back yoke 434 between the inner peripheral annular portion 434a and the outer peripheral annular portion 434b. A back yoke 434B provided with a connecting portion 434Bc for connecting the inner peripheral annular portion 434a and the outer peripheral annular portion 434b may be used.

  In this case, the embedded portions 443 of the dust core portions 442 are directly adjacent to each other and partially adjacent to each other via a connecting portion 434Bc which is a portion of the back yoke 434B. In the figure, the connecting portion 434Bc is depicted as being deformed, but it is desirable that the interval between the teeth be constant regardless of the presence or absence of the connecting portion.

{Modifications}
In each of the above-described embodiments, the case where the armature is a stator has been described. However, the configuration related to the armature may be applied to either the rotor or the stator. Moreover, this armature may be applied not only to a motor but also to a generator. Two armatures may be provided so as to sandwich the field element from both sides along the rotation axis.

  In addition, the configurations of the above embodiments can be appropriately combined as long as they do not contradict each other.

It is a disassembled perspective view which shows the principal part of the axial gap type motor which concerns on 1st Embodiment. It is a disassembled perspective view which shows the stator of an axial gap type motor same as the above. It is a figure which shows the lamination | stacking form of a lamination | stacking core part. It is a figure which shows the other lamination | stacking form of a lamination | stacking core part. It is a figure which shows the modification of a compacting core part in FIG. It is a figure which shows the other lamination | stacking form of a lamination | stacking core part. It is a figure which shows the other lamination | stacking form of a lamination | stacking core part. It is a perspective view for demonstrating the stator which concerns on 2nd Embodiment. It is a disassembled perspective view of a stator same as the above. It is a disassembled perspective view of a stator same as the above. It is a perspective view which shows the assembly middle state of a stator same as the above. It is a perspective view for demonstrating the stator which concerns on 3rd Embodiment. It is the perspective view seen from the different direction for demonstrating a stator same as the above. It is a disassembled perspective view for demonstrating a stator same as the above. It is a perspective view which shows the assembly middle state of a stator same as the above. It is a perspective view which shows the stator which concerns on 4th Embodiment. It is a top view which shows a stator same as the above. It is a disassembled perspective view of a stator same as the above. It is explanatory drawing which shows the state in the middle of manufacture of a stator same as the above. It is explanatory drawing which shows the state in the middle of manufacture of a stator same as the above. It is explanatory drawing which shows the state in the middle of manufacture of a stator same as the above. FIG. 18 is a schematic sectional view taken along line XXII-XXII in FIG. 17. It is a figure which shows the modification in a cross-sectional part similarly to FIG. It is a top view which shows the stator which concerns on 5th Embodiment. It is a schematic plan view which shows the stator which concerns on the modification of 5th Embodiment.

Explanation of symbols

18a Rotating shaft 30, 130, 230, 330, 430, 430B Stator 32 Stator core 34, 134, 234, 334, 434, 434B Back yoke 36, 136, 236 Teeth portion fixing hole 40, 40B, 40C, 40D, 40E , 140, 240, 340, 340B, 440 Teeth portion 40a Side surface 42, 42C, 42D, 42E, 142, 242, 342, 342B, 442 Dust core portion 42a, 142a Side surface 42b Outer peripheral side surface 42Ca Embedded dust core portion 46 , 46B, 46D, 46E, 146, 246, 346, 346B, 446 Laminated core part 46Da, 46Ea Outer peripheral side outward corner part 46Eb Inner peripheral side outward corner part 47 Brim forming part 50 Coil part 146p, 346p Projection part 242p Ridge 242q positioning Projection 246g Positioning groove 336 Teeth fixing groove recess 338 Ring member 343a Projection

Claims (22)

An armature (30, 130, 230, 330, 430, 430B) for an axial gap type rotating electrical machine having a rotating shaft (18a),
A substantially disk-shaped back yoke (34, 134, 234, 334, 434, 434B) that is formed of laminated steel plates that are laminated along the direction of the rotation axis and has a main surface that is substantially perpendicular to the rotation axis. When,
A dust core portion (42, 42C, 42D, 42E, 142, 242, 342, 342B, 442) formed of a dust core and a thin plate having substantially the same shape are laminated along the substantially radial direction of the back yoke. A plurality of laminated core portions (46, 46B, 46D, 46E, 146, 246, 346, 346B, 446) disposed so as to sandwich the dust core portion in the direction around the rotation axis. Teeth part (40, 40B, 40C, 40D, 40E, 140, 240, 340, 340B, 440),
A coil portion (50) wound around the plurality of tooth portions;
With
The plurality of teeth portions are embedded and fixed in the back yoke so as to protrude from the main surface of the back yoke around the rotation axis,
The outer diameter of the back yoke has an armature for an axial gap type rotating electrical machine that is at least as large as the winding thickness of the coil portion than the outer diameter of a circle connecting the outer periphery of the coil winding portion of the plurality of tooth portions. . An armature for an axial gap type rotating electrical machine according to claim 1,
An armature for an axial gap type rotating electrical machine in which a flange forming portion (47) projecting outward of each tooth portion is formed at the tip of each laminated core portion. An armature for an axial gap type rotating electrical machine according to claim 1 or 2,
Among the teeth portions (40, 40B, 40C, 40D, 40E, 140, 240, 340, 340B) adjacent to each other in the direction around the rotation axis, the back yoke (34) is interposed between the portions embedded in the back yoke. , 134, 234, 334), an armature for an axial gap type rotating electrical machine. An armature for an axial gap type rotating electrical machine according to any one of claims 1 to 3,
Each tooth part (40, 40B, 40C, 40D, 40E, 140, 240, 340, 340B, 440)
A portion surrounded by a pair of side surfaces (42a) extending so as to expand from the inner peripheral side to the outer peripheral side of the back yoke and an outer peripheral side surface (42b) connecting the pair of side surfaces to the outer peripheral side of the back yoke. It has a dust core part (42, 42C, 42D, 42E, 142, 242, 342, 342B, 442) and has a pair of laminated core parts (46, 46B, 46D, 46E, 146, 246, 346, 346B) 446) is an armature for an axial gap type rotating electrical machine, which is disposed along a pair of side surfaces of the dust core portion. An armature for an axial gap type rotating electrical machine according to claim 4,
An axial gap type in which the side surfaces (40a) adjacent to each other around the rotation axis of the teeth portions (40, 40B, 40C, 40D, 40E, 140, 240, 340, 340B, 440) are substantially parallel to each other. Armature for rotating electrical machines. An armature for an axial gap type rotating electrical machine according to claim 4 or 5,
The pair of laminated core portions (46B) of each of the tooth portions (40B, 40C) are laminated such that a plurality of thin plates overlap each other substantially along a direction substantially perpendicular to the thin plates. An armature for an axial gap type rotating electrical machine. An armature for an axial gap type rotating electrical machine according to claim 6,
The dust core portion (42C) of each tooth portion (40C) has an embedded dust core portion (42Ca) that fills a recess between end surfaces of the pair of laminated core portions. Armature. An armature for an axial gap type rotating electrical machine according to claim 4 or 5,
An axial gap type rotation in which the end faces of the pair of laminated core portions (46) of the teeth portions (40) are arranged on substantially the same plane on the inner peripheral side and the outer peripheral side of the back yoke. Armature for electric machine. An armature for an axial gap type rotating electrical machine according to claim 4 or 5,
Each of the teeth portions is formed such that a back yoke outer side outward corner portion (46Da, 46Ea) of the pair of laminated core portions (46D, 46E) of each of the tooth portions (40D, 40E) forms a substantially right angle or an obtuse angle. An armature for an axial gap type rotating electrical machine in which the stacking direction of the outer peripheral side portion of the back yoke is set inward from the stacking direction of the inner peripheral side portion of the back yoke. An armature for an axial gap type rotating electrical machine according to claim 9,
Of the pair of laminated core portions (46E) of each tooth portion (40E), the back yoke outer peripheral side outward corner portion (46Ea) and the back yoke inner peripheral side outward corner portion (46Eb) have substantially the same obtuse angle. The axial gap type rotation in which the stacking direction of the back yoke outer peripheral side portion of the pair of laminated core portions of each of the teeth portions is set to be more inward than the stacking direction of the back yoke inner peripheral side portion. Armature for electric machine. An armature for an axial gap type rotating electrical machine according to any one of claims 1 to 10,
The teeth portions (140, 240, 340, 340B) are provided with drop prevention portions (146p, 242p, 346p) that prevent the teeth portions from coming off from the back yoke (134, 234, 334) in the protruding direction. An armature for an axial gap type rotating electrical machine provided. An armature for an axial gap type rotating electrical machine according to claim 11,
The slip-off prevention part (146p, 346p) is an armature for an axial gap type rotating electrical machine provided in each of the laminated core parts (146, 346B). An armature for an axial gap type rotating electrical machine according to claim 12,
Teeth portion fixing holes (136) are formed in the back yoke (134),
Inserting the dust core portion (142) between the pair of laminated core portions in a state where the pair of laminated core portions (146) is inserted into the teeth portion fixing hole portions along the rotational axis direction. Thus, the armature for an axial gap type rotating electrical machine, wherein the removal preventing portion (146p) is engaged with the tooth portion fixing hole portion in a retaining manner. An armature for an axial gap type rotating electrical machine according to claim 12,
The back yoke (334) is formed with a groove-shaped hole portion (336) for fixing the teeth portion along the radial direction thereof,
The pair of laminated core portions (346B) and the dust core portion (342B) are inserted into the teeth portion fixing groove-like hole portions from the outer peripheral side of the back yoke, and the pair of laminated core portions are the back yoke. An armature for an axial gap type rotating electrical machine in which the removal prevention portion (346p) engages with the tooth portion fixing groove-like hole portion in a manner in which the teeth portion is prevented from coming off in the protruding direction. An armature for an axial gap type rotating electrical machine according to claim 11,
The said slip-off prevention part (242p,) is an armature for an axial gap type rotating electrical machine provided in each said powder core part (242, 342). An armature for an axial gap type rotating electrical machine according to claim 15,
Teeth portion fixing holes (236) are formed in the back yoke (234),
By inserting the dust core portion (242) into the teeth portion fixing hole portion from the side opposite to the protruding direction of the teeth portion along the rotational axis direction, the removal preventing portion (242p) is formed by the teeth. An armature for an axial gap type rotating electrical machine, which is engaged with a hole for fixing a part in a retaining manner. An armature for an axial gap type rotating electrical machine according to claim 15,
The back yoke (334) is formed with a groove-shaped hole portion (336) for fixing the teeth portion along the radial direction thereof,
In a mode in which the dust core part (342) is inserted into the tooth part fixing groove-like hole part from the outer peripheral side of the back yoke, and the teeth part is prevented from coming off in the protruding direction from the back yoke. An armature for an axial gap type rotating electrical machine in which a slip-off preventing portion (242p) engages with the groove portion for fixing the tooth portion. An armature for an axial gap type rotating electrical machine according to any one of claims 1 to 17,
An axial gap in which a misalignment prevention portion (242q, 246g) for preventing mutual misalignment is provided in each of the dust core portion and the pair of laminated core portions disposed so as to sandwich the dust core portion. Armature for type rotary electric machine. An armature for an axial gap type rotating electrical machine according to any one of claims 1 to 18,
An axial gap type rotating electrical machine in which the dust core part and the pair of laminated core parts arranged so as to sandwich the powder core part are maintained in a combined state by a coil part (50) wound around them. Armature. The axial gap type rotating electrical machine according to any one of claims 1 to 19,
The axial gap type rotating electrical machine in which the portion embedded in the back yoke (334) in each of the dust core portions (342, 342B) protrudes toward the outer periphery of the back yoke rather than the portion protruding from the back yoke. Armature. An armature for an axial gap type rotating electric machine according to claim 20,
Of each of the powder cores (342, 342B), the end of the portion embedded in the back yoke (334) and projecting toward the outer periphery of the back yoke is located on the outer peripheral surface of the back yoke. , Armature for axial gap type rotating electrical machines. An armature for an axial gap type rotating electrical machine according to claim 21,
An armature for an axial gap type rotating electric machine, wherein an annular frame (338) is fitted on the outer periphery of the back yoke.

Images