JP6285019B2 - Axial gap type rotating electrical machine - Google Patents

Description

  The present invention relates to an axial gap type rotating electrical machine (motor, generator).

  FIG. 15 shows a conceptual diagram of an axial gap type rotating electrical machine. A permanent magnet 2 is attached to the surface of the disk-shaped rotor 1, and a stator 4 (coil and iron core) is disposed via an axial gap 3. The rotor 1 is attached to a rotor shaft 6 and supported by a bearing 5 to rotate. The axial gap type rotating electrical machine can increase the working area of the magnet 2 to be attached by increasing the outer diameter of the rotor 1, and can obtain a high output without increasing the axial length of the rotating electrical machine. For this reason, it is used for a rotating electrical machine that requires thinness, such as a fan motor arranged on the ceiling and a disk motor for driving an automobile arranged in a tire. In addition, in a rotating electrical machine of the same volume, since the working area of the magnet can be made larger than that of a radial gap type rotating electrical machine, an output equivalent to or higher than that of a radial gap type rotating electrical machine using a rare earth magnet by a ferrite magnet having a low magnetic force is provided. Can be obtained. For this reason, it attracts attention as a low-cost, high-output rotating electrical machine that does not use rare earths. The same applies to SR motors (generators) and induction motors (generators) that do not use permanent magnets for the rotor 1.

  Here, a stator structure of a conventional axial gap type rotating electrical machine will be described. FIG. 16 shows a tooth 9 serving as a magnetic pole of the stator. Magnetic steel sheets are laminated in the radial direction of the stator to form a block having a rectangular, trapezoidal, or sectoral cross-sectional shape (FIG. 16 is an example of a trapezoidal cross-sectional shape). In FIG. 16, the caulking 10 is used for fixing the electromagnetic steel sheet, but there are cases where the fixing is performed using laser welding or an adhesive. Alternatively, these teeth 9 may be obtained by cutting and laminating amorphous foil bodies, or may be constituted by solidifying magnetic powder having an insulating surface. FIG. 17 shows a bobbin 11 mounted around the tooth 9, and by arranging a coil 7 (not shown) around the bobbin 11, insulation between the tooth and the coil is ensured. Alternatively, an insulating paper or insulating tape may be wound around the teeth instead of the bobbin, or in recent years, insulation from the teeth may be ensured only by an insulating film (PPS or the like) on the surface of the electric wire.

  18 and 19 show structural examples of a conventional axial gap type rotating electrical machine using a resin mold for fixing the teeth. First, in the structure of FIG. 18, the coil 7 is wound around the bobbin 11 of FIG. 17 and then assembled to the tooth 9 of FIG. 16. Then, the teeth 9 assembled with the coil 7 are arranged in a ring shape and inserted into the case 12 of the rotating electrical machine. Thereafter, in order to fix the teeth 9 and the coil 7 in the axial direction and the circumferential direction, resin is injected into the case 12 and cured. Next, FIG. 19 shows a structure using the back yoke 14 in consideration of the attachment strength of the teeth. First, the teeth 9 have a length protruding from the end surface of the bobbin 11. Also, an integrated annular back yoke 14 is prepared in which holes 13 having the outer peripheral shape of the teeth 9 are arranged in the circumferential direction. Here, the back yoke 14 is generally formed by punching and laminating a steel plate (a nonmagnetic material is preferable, but a magnetic material may be used). Good. And the teeth 9 are positioned in the circumferential direction by inserting a part of the teeth 9 protruding from the end surface of the bobbin 11 into the hole 13 of the back yoke. (See Patent Documents 1 to 3)

JP 2011-182576 A JP 2011-91933 A Japanese Patent No. 4518903

  18 has no means for fixing the teeth 9 in the circumferential direction and the rotation axis direction, and the structure in FIG. 19 has no means for fixing the teeth 9 in the rotation axis direction. Therefore, it is necessary to inject resin into the case 12. For this reason, there has been a drawback that it cannot be used for a rotating electrical machine that requires a strength that receives a large reaction force and a rotating electrical machine that is used in a harsh usage environment (high temperature, large temperature change, high humidity, etc.).

  An object of the present invention is to provide an axial gap type rotating electrical machine having high strength and high magnetic performance by a structure that can fix the position of a tooth without using a resin mold.

  In order to achieve the above object, the present invention adopts the configurations described in the claims.

The present invention includes a plurality of means for solving the above-mentioned problems. If an example of the axial gap type rotating electrical machine of the present invention is given, an axial gap type rotating electrical machine in which the gap surface of the rotor and the stator is orthogonal to the rotating shaft. The stator of the rotating electrical machine includes a plurality of teeth made of a magnetic material, a plurality of coils assembled on an outer periphery of the teeth, and a back yoke, and is axially disposed in a groove provided in a circumferential direction of the back yoke. the teeth are inserted, the back yoke is provided with a thin portion, said bore extending in the radial direction of each of the teeth, or depressions and the fitted and deformed portion of the thin portion of the back yoke, the teeth Is fixed in the axial direction.

  Another example of the axial gap type rotating electrical machine of the present invention is an axial gap type rotating electrical machine in which the gap surface of the rotor and the stator is perpendicular to the rotating shaft, and the stator of the rotating electrical machine is a magnetic material. A plurality of teeth composed of a plurality of teeth, a plurality of coils assembled on an outer periphery of the teeth, and a back yoke. The plurality of teeth are arranged in a circumferential direction of the back yoke, and a back is formed in a hole extending in a radial direction of each of the teeth. A part of the yoke is passed, and the teeth are fixed in the axial direction.

Another example of the axial gap type rotating electrical machine of the present invention is an axial gap type rotating electrical machine in which the gap surface of the rotor and the stator is perpendicular to the rotating shaft, and the stator of the rotating electrical machine is a magnetic material. a plurality of teeth made of, composed of a plurality of coils and the back yoke is assembled to the outer periphery of the teeth, the back yoke, the groove Ru extending radially, a plurality in the circumferential direction, a groove provided on the side surface of the teeth, wherein each of the teeth in the radial direction within the groove provided in Bakkuyo click is inserted, the groove and by the protruding portion is fitted in the back yoke side of the teeth, to fix the teeth in the axial direction, the the tips of the projecting portions of the back yoke sandwiching the teeth spread on radial end portions of the teeth, especially that it has fixed the teeth radially It is an.

  According to the present invention, since the position of the teeth is fixed by fitting the teeth and the back yoke, the teeth can be firmly fixed without using resin, the torque reaction force is large, and the harsh environment (high temperature, temperature change) It is possible to obtain an axial gap type rotating electrical machine that can be used in large, high humidity, etc.

  In addition, since no pressure is applied to the teeth and iron loss due to strain does not increase, an axial gap type rotating electrical machine with high output and efficiency can be obtained.

It is sectional drawing which cut | disconnected the stator of Example 1 of this invention by the surface which passes along the hole of teeth and is orthogonal to a rotating shaft. It is a figure which shows the teeth which have the hole (or recessed part) used in Example 1 of this invention. It is a structure figure of the stator of Example 1 of this invention. In Example 1 of this invention, it is a figure which shows the structural example which provided the clearance gap in the outer peripheral part (thin part) of the back yoke, and prevented the eddy current loss. In Example 1 of this invention, it is a figure which shows the structural example which provided the clearance gap in the inner peripheral part of the back yoke, and prevented the eddy current loss. It is a figure which shows the back yoke which has the auxiliary | assistant protrusion part used in Example 2 of this invention. It is a whole view of the back yoke which has an auxiliary | assistant protrusion part used in Example 2 of this invention. It is a structural diagram of the stator of Example 2 of the present invention. In Example 2 of this invention, it is a figure which shows the structural example which does not provide the groove | channel for teeth insertion in a back yoke. It is a whole view of the back yoke which does not provide the groove | channel for teeth insertion used in Example 2 of this invention. It is a figure which shows the back yoke which has a deformation | transformation part in the front-end | tip of the protrusion part used in Example 3 of this invention. It is a whole view of the back yoke used in Example 3 of the present invention. It is a figure which shows the teeth which have a groove | channel on the side surface of the radial direction used in Example 3 of this invention. It is a structural diagram of the stator of Example 3 of the present invention. FIG. 3 is a structural diagram of an axial gap type rotating electrical machine. It is a figure which shows the teeth of an axial gap type rotary electric machine. It is a figure which shows the bobbin of an axial gap type rotary electric machine. It is a figure which shows the stator of the conventional axial gap type rotary electric machine which used the resin mold for fixation of teeth. It is a figure which shows the stator of the axial gap type rotary electric machine which uses the resin mold and the back yoke for fixation of teeth.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that components having the same function are denoted by the same names and reference numerals in the drawings for describing the embodiments, and repetitive description thereof is omitted.

  An axial gap type rotating electrical machine according to a first embodiment of the present invention will be described with reference to FIGS. In the stator of the axial gap type rotating electrical machine of the first embodiment, as shown in FIG. 2, a hole (or recess) 17 extending in the stacking direction of the teeth 9 is provided. Then, with the bobbin 11 and the coil 7 attached to the periphery of the tooth 9 as shown in FIG. 3, the protruding portion of the tooth 9 is inserted into the groove of the back yoke 14. Here, the hole (or recess) 17 provided in the above-described tooth is provided on the protruding portion side of the tooth 9. Further, the back yoke 14 is provided with a thin portion 18 on the outer peripheral side, and a hemispherical punch is pressed from the outer peripheral side with the teeth hole (or recess) 17 aligned with the radial and axial positions. As a result, the deformed portion 18 of the back yoke 14 and the tooth hole (or recess) 17 are fitted, and the tooth 9 is fixed in the axial direction. Finally, the back yoke 14 is press-fitted into the case 12. FIG. 1 is a cross-sectional view of a state in which a tooth 9 and a back yoke 14 are fitted by a hole (or recess) 17 and a deformed portion 19 of the back yoke, cut by a plane perpendicular to the rotation axis through the hole (or recess) 17. FIG.

  4 and 5 show modifications of the axial gap type rotating electric machine according to the first embodiment. If the back yoke 14 is made of a conductive material and is continuous with the outer periphery of the tooth 9, a large eddy current may flow and the efficiency of the rotating electrical machine may deteriorate. Therefore, as shown in FIG. 4, a gap 20 may be provided in the back yoke in the axial direction at the outer thin portion 18. Further, as shown in FIG. 5, a structure in which a gap 20 is provided between the thin portions 18 on the inner peripheral side of the back yoke may be adopted.

  According to the present embodiment, the teeth (or recesses) 17 of the teeth 9 and the deformed portions 19 of the back yoke 14 are fitted to each other so that the teeth can be removed without using a resin mold and applying stress to the teeth 9. It can be fixed in the axial direction (the radial direction is fixed by the groove of the back yoke 14). Although the back yoke 14 is distorted by deformation, it is not used as a magnetic circuit through which magnetic flux passes and does not affect the electromagnetic characteristics.

  An axial gap type rotating electrical machine according to a second embodiment of the present invention will be described with reference to FIGS. In the stator of the axial gap type rotating electrical machine according to the second embodiment, first, as shown in FIG. 6, the back yoke 14 is provided with a groove 16 that is opened on either the inner or outer periphery. And the protrusion part 21 is provided in the center part of the groove | channel 16. FIG. And the deformation | transformation part 22 is provided in the front-end | tip of the protrusion part 21, and it is made the shape which can be shape | molded by opening it right and left. FIG. 7 is a plan view showing the overall structure of the bark yoke 14 shown in FIG. Next, as shown in FIG. 8, a hole 17 is provided in the tooth 9, and the tooth 9 is assembled to the back yoke 14 in the radial direction through the protruding portion 21 of the back yoke 14 in the hole 17. Then, the teeth 9 are prevented from falling off in the radial direction by being deformed so as to open the deformed portion 22 at the tip of the teeth 9. Finally, a stator is formed by arranging coils around the teeth 9. The periphery of the coil may be protected with a bobbin, insulating paper, insulating tape, or the like, or the insulating performance may be ensured only with the insulating film of the electric wire. In FIG. 6, the deformed portion 22 is provided at the tip of the protrusion 21 in the groove 16 of the back yoke 14, but the deformable portion 22 may be provided at the tip of the protrusion 23 on the side of the groove 16 of the back yoke 14.

  9 and 10 show a modification of the axial gap type rotating electrical machine of the second embodiment. In this modification, as shown in FIG. 9, the protruding portions 23 of the back yoke 14 located on both sides of the teeth 9 are eliminated, and only the protruding portions 21 through which the holes 17 of the teeth 9 are passed are left. FIG. 10 is a plan view showing the overall structure of the bark yoke 14 shown in FIG. Then, the teeth 9 are assembled to the back yoke 14 in the radial direction through the protrusions 21 of the back yoke 14 through the holes 17 of the teeth 9. And it deform | transforms so that the deformation | transformation part 22 of the front-end | tip of the teeth 9 may be opened.

  According to the present embodiment, the teeth 9 are assembled to the back yoke 14 through the protrusions 21 of the back yoke 14 through the holes 17 of the teeth 9, so that the teeth can be used without using a resin mold and applying stress to the teeth 9. Can be fixed in the axial direction and the radial direction.

  An axial gap type rotating electric machine according to a third embodiment of the present invention will be described with reference to FIGS. In the stator of the axial gap type rotating electrical machine according to the third embodiment, as shown in FIG. 11, the back yoke 14 is provided with a groove 16 that is open on either the inner or outer periphery. And the deformation | transformation part 22 is provided in the front-end | tip of the protrusion part 23 beside the groove | channel 16, and it is set as the shape which can be shape | molded by opening it right and left. FIG. 12 is a plan view showing the overall structure of the bark yoke 14 shown in FIG. Further, as shown in FIG. 13, grooves 24 are provided on the side surfaces of the teeth 9 in the radial direction. And as shown in FIG. 14, the teeth 9 are assembled | attached in the groove | channel 16 of the back yoke 14 from radial direction. Here, the axial height h2 of the groove 24 on the side surface of the tooth is made slightly larger than the axial height h1 of the protruding portion 23 of the back yoke. Further, the width W3 of the protruding portion of the tooth 9 is larger than the width W1 of the groove of the back yoke 14, and the width W2 of the groove 24 portion of the tooth 9 is made smaller than the width W1 of the groove of the back yoke 14. Thereby, the teeth 9 can be fixed in the axial direction by fitting the side grooves 24 of the teeth 9 and the protrusions 23 of the back yoke 14. Then, after inserting the tooth 9 into the groove 16, the deformed portion 22 at the tip of the projecting portion 23 of the back yoke 14 is widened to the left and right, thereby forming the tooth 9 in the radial direction. Finally, a stator is formed by arranging coils around the teeth 9. The periphery of the coil may be protected with a bobbin, insulating paper, insulating tape, or the like, or the insulating performance may be ensured only with the insulating film of the electric wire.

  According to the present embodiment, the side surface groove 24 of the tooth 9 and the protruding portion 23 of the back yoke 14 are fitted to each other so that the teeth can be moved in the radial direction of the stator without using a resin mold and applying stress to the teeth. Can be fixed in the direction. Therefore, it is possible to obtain an axial gap type rotating electrical machine that has a large torque reaction force and can be used in a severe environment (high temperature, large temperature change, high humidity, etc.).

DESCRIPTION OF SYMBOLS 1 Rotor 2 Permanent magnet 3 Gap 4 Stator 5 Bearing 6 Rotor shaft 7 Coil 9 Teeth 10 Caulking 11 Bobbin 12 Case 13 Integrated back yoke hole 14 Integrated back yoke 16 Integrated back yoke groove 17 Hole provided in teeth (Or recess)
18 Thin portion of back yoke 19 Deformed portion of back yoke 20 Clearance of back yoke 21 Protruding portion in groove of back yoke 22 Deformed portion of protruding end of back yoke 23 Protruding portion beside groove of back yoke 24 Groove on side of teeth

Claims (11)

An axial gap type rotating electrical machine in which the gap surface between the rotor and the stator is perpendicular to the rotating shaft,
The stator of the rotating electrical machine is composed of a plurality of teeth made of a magnetic material, a plurality of coils and a back yoke assembled to the outer periphery of the teeth,
The teeth are inserted in the axial direction into a groove provided in the circumferential direction of the back yoke,
The back yoke includes a thin portion,
Rotating electric machine, characterized in that said holes extending in a radial direction of each of the teeth, or in the fitted and deformed portion of the thin portion of the back yoke and depressions, to fix the teeth in the axial direction. In the rotating electrical machine according to claim 1 ,
The rotating electric machine according to claim 1, wherein the deformed portion of the thin portion of the back yoke is formed by pressing a hemispherical punch. In the rotating electrical machine according to claim 1 ,
The rotating electrical machine according to claim 1, wherein the deformed portion of the back yoke is formed on an outer peripheral side of the back yoke. In the rotating electrical machine according to any one of claims 1 to 3 ,
A rotating electrical machine characterized in that a gap is provided in the axial direction in a thin portion on an outer peripheral side or an inner peripheral side of the back yoke. An axial gap type rotating electrical machine in which the gap surface between the rotor and the stator is perpendicular to the rotating shaft,
The stator of the rotating electrical machine is composed of a plurality of teeth made of a magnetic material, a plurality of coils and a back yoke assembled to the outer periphery of the teeth,
The plurality of teeth are arranged in a circumferential direction of the back yoke,
A rotating electric machine characterized in that a part of a back yoke is passed through a hole extending in a radial direction of each of the teeth, and the teeth are fixed in an axial direction. In the rotating electrical machine according to claim 5 ,
The respective teeth are inserted in the radial direction into a plurality of grooves provided in the circumferential direction of the back yoke,
Protruding portions are provided in the grooves of the back yoke,
A rotating electric machine characterized in that the protrusion is passed through a hole extending in a radial direction of the tooth, and the tooth is fixed in an axial direction. In the rotating electrical machine according to claim 6 ,
A rotating electric machine characterized in that a tip of the protruding portion protruding from a hole of the tooth is widened to fix the tooth in a radial direction. In the rotating electrical machine according to claim 6 ,
A rotating electric machine characterized in that a tip of a projecting portion sandwiching the teeth is spread on a radial end portion of the teeth and the teeth are fixed in a radial direction. In the rotating electrical machine according to claim 5 ,
Providing the back yoke with a protruding portion extending in the radial direction,
A rotating electric machine characterized in that the protrusion is passed through a hole extending in a radial direction of the tooth, and the tooth is fixed in an axial direction. The rotating electrical machine according to claim 9 ,
A rotating electric machine characterized in that a tip of the protruding portion protruding from a hole of the tooth is widened to fix the tooth in a radial direction. An axial gap type rotating electrical machine in which the gap surface between the rotor and the stator is perpendicular to the rotating shaft,
The stator of the rotating electrical machine is composed of a plurality of teeth made of a magnetic material, a plurality of coils and a back yoke assembled to the outer periphery of the teeth,
The back yoke, the groove Ru extending radially, a plurality in the circumferential direction,
A groove is provided on the side surface of the tooth,
Wherein each of the teeth in the radial direction within the groove provided in Bakkuyo click is inserted, the groove and by the protruding portion is fitted in the back yoke side of the teeth, to fix the teeth in the axial direction,
A rotating electric machine characterized in that a tip of a protruding portion of a back yoke sandwiching the teeth is spread on a radial end portion of the teeth and the teeth are fixed in a radial direction .

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