JP2011188587A - Stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an unconventional, epoch-making exciting coil structure which contributes to the miniaturization, weight reduction, and cost cutting of a motor, in a stator in which a plurality of teeth with magnetic poles on which exciting coils are wound concentrically are arranged in the circumferential direction. <P>SOLUTION: The exciting coils 8u to 8w of the stator 2 are formed by rectangular wire coils 13a. In that case, the rectangular wire coils 13a are formed by winding a rectangular wire 13 to start winding the wire from outer circumferential side and to finish winding the wire at the outer circumferential side by alternately changing the winding direction of each step from the outer circumferential side to the inner circumferential side and from the inner circumferential side to the outer circumferential side with its wide width surface facing the circumferential surface of each of teeth 51, 62 of the stator 2 and each exciting coil of at least a part of magnetic poles is formed by a cassette coil 81 of the same rectangular wire 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stator in which teeth of a plurality of magnetic poles around which an exciting coil is concentratedly wound are arranged in the circumferential direction, and more particularly to provision of an unprecedented exciting exciting coil structure.

  Conventionally, both the axial gap and radial gap motors include a stator in which teeth of a plurality of magnetic poles around which an exciting coil is concentrated are arranged in the circumferential direction.

  FIG. 11 shows a connection structure of stator excitation coils in a three-phase drive axial gap motor. The core 110 of the stator 100 is an annular shape in which a motor shaft (not shown) is loosely inserted in the center of a motor case 111. As three-phase U, V, and W excitation coils, four U-phase coils U1 to U4, V-phase coils V1 to V4, and W-phase coils W1 to W4 are provided. The coils U1 to W4 are concentratedly wound around the teeth 112 of magnetic poles provided at substantially equal intervals in the circumferential direction on the core 110 via insulators (not shown), and coil windings on the outer peripheral side and inner peripheral side ( Wires 113u, 113v, 113w are connected in series or in parallel with the bus ring, and are further drawn out to the connection portions 14u, 14v, 14w located on the outer peripheral side of the core 110. In addition, the neutral wire 115 is arrange | positioned at the outer peripheral side (for example, refer patent document 1 (paragraph [0007], [0008], FIG. 1 etc.)).

  In addition, as another connection structure of the excitation coil of the stator in the axial gap motor, it has also been proposed to continuously form the respective excitation coils of the same phase magnetic poles by concentrating the same circular wire having a circular cross section (for example, Patent Document 2 (see paragraphs [0040]-[0093], FIG. 1, FIG. 2, etc.).

  Furthermore, it has also been proposed to form a coil by electrically connecting the first and second layers of a rectangular coil that are formed one above the other as a connection structure of a stator exciting coil in an axial gap motor. (For example, see Patent Document 3 (paragraph [0014], FIG. 1 and the like)).

JP 2006-345655 A JP 2006-230179 A JP-A-9-168270

  In the case of the stator described in Patent Document 1, bus rings are required on the outer peripheral side and the inner peripheral side in order to connect the exciting coil, which increases the physique and weight of the motor and increases the cost of the motor. In addition, since the bus ring and each exciting coil are connected, there are many connection points and productivity is low.

  In the case of the stator described in Patent Document 2, the bus ring is not used, but each exciting coil is wound around a dummy member together with a connecting wire between the coils by one continuous winding for each phase. Since it is manufactured with a certain thickness, a rectangular wire cannot be used in the manufacturing method, and only a round wire coil can be used. For this reason, the space factor of the coil cannot be as high as that of the flat wire due to the gap between the round wires, and the physique of the motor is increased accordingly.

  In the case of the stator described in Patent Document 3, it is necessary to connect the upper rectangular coil and the lower rectangular coil, the inner peripheral side of the coil must be soldered, and the productivity is low. is there.

  The stator excitation coil in the radial gap motor has the same problems as described above.

  The present invention provides an unprecedented exciting excitation coil structure that contributes to reduction in size, weight and cost of a motor in a stator in which teeth of a plurality of magnetic poles around which an excitation coil is concentrated are arranged in the circumferential direction. The purpose is to do.

  In order to achieve the above-described object, the stator according to the present invention is a stator in which teeth of a plurality of magnetic poles around which an exciting coil is concentrated are arranged in the circumferential direction. The exciting coil is formed by a rectangular wire coil, and the rectangular The wire coil has a rectangular wire with a wide surface facing the peripheral surface of each tooth, and the winding direction is changed alternately from the outer peripheral side to the inner peripheral side and from the inner peripheral side to the outer peripheral side for each step. The rectangular wire coil as the exciting coil of each of the magnetic poles is continuously formed at least partly with the same rectangular wire. (Claim 1).

  In the case of the stator according to the first aspect of the present invention, the exciting coil of each magnetic pole of the stator has a rectangular wire in a direction in which the wide surface faces the peripheral surface of each tooth (if the edgewise is set sideways, In the first stage, the winding direction is changed from the outer circumference side to the inner circumference side, the second stage is the winding direction from the opposite inner circumference side to the outer circumference side, and so on. In other words, it is formed of a coil body wound so as to start winding from the outer peripheral side and finish winding on the outer peripheral side. In addition, for example, the coil body of the exciting coil having the same phase magnetic pole is continuously formed by repeating the start of winding from the outer peripheral side and the end of winding on the outer peripheral side as described above by the same single rectangular wire.

  In this case, a rectangular wire is used instead of a round wire, and each exciting coil is formed by concentrating the rectangular wire with a so-called alpha winding. The space factor of the exciting coil with respect to is increased. In addition, the alpha wire coil body of a rectangular wire is bent in an easy bending direction to constitute an exciting coil, so that it does not swell toward the inner peripheral side and the outer peripheral side like a round wire coil body. The size of the motor can be reduced by narrowing the space with the motor shaft.

  Further, since the winding start and end of the flat wire are both positioned on the outer peripheral side of the coil body, it is not necessary to draw the flat wire that has been wound from the inner peripheral side to the outer peripheral side of the stator, There is no need to draw a flat wire, and the size of the motor does not increase. Specifically, if the rectangular wire is routed from the inner peripheral side to the outer peripheral side, it is necessary to ensure that the magnetic pole height of the stator or the gap (gap) between the stator and the rotor is larger by the thickness of the rectangular wire. In addition, it is necessary to secure a gap corresponding to the thickness of the flat wire on the outer peripheral side of the stator, but in the case of the present invention, it is not necessary to route the flat wire from the inner peripheral side of the stator to the outer peripheral side. The size of the motor is reduced both in the motor axial direction and in the radial direction.

  In addition, since the rectangular wire is alpha-wrapped, it is easy to bend the corners and crossovers of the exciting coil, the thickness is not increased, the exciting coil is easily formed, and the motor becomes smaller and lighter. .

  In addition, the exciting coils of all or part of the magnetic poles of the same phase are continuously formed with the same rectangular wire coil body, so that no bus ring is required, and the motor becomes smaller and lighter accordingly. At the same time, the cost can be reduced.

  Therefore, it is possible to provide an unprecedented exciting excitation coil structure that contributes to the reduction in size, weight and cost of the motor.

It is the disassembled perspective view which abbreviate | omitted a part of the three-phase drive axial gap motor of one Embodiment of this invention. FIG. 2 is a perspective view of a cassette coil forming a part of exciting coils of the stator of FIG. 1. It is a top view of the cassette coil of FIG. (A), (b) is sectional drawing explaining the winding state of each position of the BB line of FIG. 3, and the AA line. (A), (b) is the front view of the stator of FIG. 1 of the state which assembled | attached the exciting coil of one phase, and sectional drawing of the CC line | wire. (A), (b) is the front view of the stator of FIG. 1 of the state which assembled | attached some excitation coils of two phases, and sectional drawing of the DD line | wire. (A), (b) is the front view of the stator of FIG. 1 of the state which assembled | attached the excitation coil of a part of 3 phases, and sectional drawing of the EE line. (A), (b) is the front view of the stator of FIG. 1 of the state which also assembled the remaining excitation coils of one phase, and the sectional view of the FF line. (A), (b) is the front view of the stator of FIG. 1 of the state which assembled | attached the remaining excitation coils of two phases, and sectional drawing of the GG line. (A), (b) is the front view of the stator of FIG. 1 of the assembly completion state which also assembled | attached the remaining excitation coils of three phases, and sectional drawing of the HH line. It is explanatory drawing of the exciting coil structure of the stator of a prior art example.

  Next, in order to describe the present invention in more detail, an embodiment will be described in detail with reference to FIGS. In these drawings, the motor shaft and the like are omitted as appropriate.

  FIG. 1 shows a three-phase drive axial gap motor 1 according to the present embodiment. The axial gap motor 1 is arranged such that gaps are provided on both front and back sides of the stator 2 so that the rotors 3a and 3b face each other. The solid magnetic path configuration in which either one of the front and back magnetic pole surfaces of the stator 2 is excited to the N pole or the S pole, and either one of the front and back magnetic pole faces of the stator 2 is excited to the opposite S pole or the N pole. .

  This three-dimensional magnetic path configuration will be described in further detail on the assumption that all the magnetic poles on the front surface side of the stator 2 are excited to the S pole and all the magnetic poles on the back surface are excited to the N pole by the excitation of the three phases U, V, and W.

  First, the rotors 3a and 3b are rotatably supported by the motor shaft 4, and the stator 2 is placed in a fixed state between the rotors 3a and 3b with the motor shaft 4 being loosely inserted in the center.

  Next, when the magnetic poles of each phase are arranged in the order of U, V, and W on the front and back surfaces of the stator 2 and each of the four magnetic poles is arranged at intervals of 90 degrees, the stator 2 The surface-side core 5 in which 12 divided cores 51 having a fan shape in a plan view are arranged in the circumferential direction and the 12 divided cores 61 having the same shape as the divided cores 51 are shifted from each divided core 51 back to back by 1/2 magnetic pole bitch. And a back-side core 6 disposed in the circumferential direction. Each divided core 51 is formed with an S-pole tooth 52 by, for example, a dust core, and each divided core 61 is formed with an N-pole tooth 62 by, for example, a dust core. By doing so, the number of magnetic poles of the stator 2 viewed from the direction of the motor shaft 4 becomes 24 poles, which is twice the 12 poles on one side of the front and back.

  Each of the split cores 51 and 61 is detachably mounted with an insulator 7 having a flanged outer frame shape as an insulating partition, for example.

  The U-phase split cores 51 and 61 are provided with a concentrated winding U-phase excitation coil 8 u via an insulator 7, and the V-phase split cores 51 and 61 are concentrated with a concentrated winding V-phase excitation via an insulator 7. A coil 8v is mounted, and a concentrated winding W-phase exciting coil 8w is mounted to the W-phase split cores 51 and 61 via an insulator 7.

  The exciting coils 8u, 8v, 8w mounted on the divided cores 51 via the insulator 7 are each formed of an insulating annular double outer frame 9a, 9b as a crossover guide and a terminal block, and 1 each. A pair of split ring-shaped triple inner locking bodies 10a, 10b, and 10c are fitted and fixed on the outer side and the inner side. Similarly, the exciting coils 8u, 8v, 8w attached to the respective split cores 61 via the insulator 7 are insulating loop double outer frames 9c, 9d as a crossover guide and a terminal block, respectively. A pair of split ring-shaped triple inner locking bodies 10d, 10e, and 10f are fitted and fixed to the outside and the inside.

  On the other hand, each of the rotors 3a and 3b includes, for example, eight teeth magnetic poles 31 arranged at equal intervals in the circumferential direction on the magnetic pole surfaces facing the stator 2.

  Furthermore, a cylindrical shaft magnetic path material 11 made of a magnetic material is provided coaxially on the motor shaft 4, and both end surfaces of the shaft magnetic path material 11 are joined to the yoke surfaces of the rotors 3 a and 3 b.

  Then, the axial gap motor 1 is driven by sequential energization of the excitation coils 8u, 8v, 8w of the respective phases on the front and back surfaces of the stator 2, for example, in the case of the U phase, four U-phase teeth 52 at intervals of 90 degrees on the front side. Is excited to the S pole, and the four U-phase teeth 62 at 90 ° intervals on the back side are excited to the N pole, and the magnetic flux emitted from the U pole of the U phase on the back side is a magnetic pole near the opposing rotor 3b. 31, through the magnetic path forming member 4, toward the rotor 3 a, and from the magnetic pole of the rotor 3 a near the U-phase S pole of the stator 2 toward the U-phase S pole on the front side of the stator 2. In the case of the V-phase, in the stator 2, the four V-phase teeth 52 at 90 ° intervals adjacent to the U-phase teeth 52 on the front side are excited to the S pole, and the four V-phase teeth at 90 ° intervals on the back side. The phase teeth 62 are excited to the N pole, and the magnetic flux emitted from the V phase N pole on the back side passes through the magnetic pole 31 in the vicinity of the opposing rotor 3b and the magnetic path forming member 4 to the rotor 3a. From the magnetic pole of the rotor 3a in the vicinity of the V-phase S pole, the V-phase S pole on the front side of the stator 2 is directed. Further, in the case of the W phase, in the stator 2, the four W phase teeth 52 at 90 ° intervals adjacent to the front V phase teeth 52 are excited to the S pole, and the four W W at 90 ° intervals on the back side. The phase teeth 62 are excited to the N pole, and the magnetic flux emitted from the W phase N pole on the back side passes through the magnetic pole 31 and the magnetic path forming member 4 in the vicinity of the opposing rotor 3b toward the rotor 3a. From the magnetic pole of the rotor 3a in the vicinity of the W-phase S pole toward the W-phase S pole on the front side of the stator 2.

  In this manner, a solid magnetic path is formed between the stator 2 and the front and back rotors 3a and 3b in the direction of the motor shaft 4, the rotors 3a and 3b rotate to rotate the motor shaft 4, and an axial gap motor. 1 is driven.

  Note that the axial gap motor 1 of the present embodiment increases the amount of magnetic flux to increase the torque of the axial gap motor 1, so that the stator 2 has an annular field coil 12 for each front and back, or for both front and back surfaces. The field coil 12 is configured to supply a suitable amount of direct current to generate a constant bias magnetic flux.

  Next, the structure and assembly of the excitation coils 8u to 8w for the respective phases on the front and back of the stator 2 will be further described.

  Each of the four exciting coils 8u to 8w of each phase on the front and back surfaces of the stator 2 is composed of, for example, a set of two cassette coils 81.

  FIG. 2 shows, for example, a cassette coil 81 that forms two exciting coils 8u with a 90-degree interval on the U phase on the front side. The cassette coil 81 includes two rectangular wires coils in which one rectangular wire 13 is concentratedly wound. In this configuration, two concentrated winding exciting coils 8u positioned on a half circumference of the stator 2 are formed by 13a, and the flat wire coils 13a of both exciting coils 8u are connected by a jumper wire 82. The flat wire coil 13a is a so-called alpha winding of a flat wire, with the wide surface facing the peripheral surface of the tooth 52, and the winding direction from the outer peripheral side to the inner peripheral side and the inner peripheral side for each step. In this structure, the windings are alternately changed from the outer circumference side to the outer circumference side so as to start winding from the outer circumference side and finish winding on the outer circumference side.

  3 is a plan view of the cassette coil 81 of FIG. 2, and FIGS. 4A and 4B are cross sections showing the winding structure of the BB line and the AA line of the exciting coil 8u of FIG. FIG.

  When each of the exciting coils 8u to 8w has a configuration in which one stage is approximately 7 turns and the rectangular wire coils 13a are stacked in four stages in the direction of the motor shaft 4, the winding of the rectangular wire 13 is one excitation. The coil 8u will be described below. As shown in FIGS. 4A and 4B, the rectangular coil 13a as the exciting coil 8u starts winding from the outside in the first stage and winds it for 7 turns, and turns the 8th turn. Wind diagonally upward and proceed to the second stage. When the second stage begins to wind from the inside and reaches the outside at the 14th turn, wind the 15th turn diagonally upward and proceed to the third stage. When starting to wind and reaching the inner side at turn 21, the 22nd turn is wound obliquely upward and proceeding to the fourth step, the fourth step starting from the inner side and reaching the outer side at the 29th turn, predetermined 30th turn Pulled out of position and thus excited Yl 8u is formed by alpha winding. Numbers 1 to 30 in FIGS. 4A and 4B are turn numbers.

  Further, when the winding of the rectangular wire coil 13a of the first exciting coil 8u is finished, the connecting wire 82 having an appropriate length is formed, and the rectangular wire coil 13a of the next exciting coil 8u is similarly formed by alpha winding.

  Then, if the necessary number of cassette coils 81 each having two excitation coils 8u to 8w connected for each phase by connecting wires 82 is prepared (in the case of this embodiment, two per phase for each front and back), The two exciting coils 8u to 8w of the cassette coil 81 are mounted on the corresponding two teeth 52 and 62 of the stator 2 via the insulator 7 so as to be stacked in order from the U phase, for example, on the front and back sides of the stator 2. . Each cassette coil 81 can be manufactured with high productivity by, for example, spindle winding.

  Next, the mounting of the cassette coils 81 on the front and back of the stator 2 by the cassette coil 81 on the front side of the stator 2 will be further described. It is assumed that each phase of the cassette coil 81 is mounted for one half of each phase, and then the remaining half of the coil is mounted. The same applies to the mounting of the cassette coil 81 on the back side of the stator 2.

  5 (a) and 5 (b) show a state in which the first U-phase cassette coil 81 of the first U phase (a half circumference of the stator 2) is attached to the stator 2, and the CC line in FIG. 5 (a). As shown in FIG. 2B, which is a cross-sectional view, the crossover wire 82 is disposed along the guide groove 14c of one inner locking body 10c. At this time, the leading and trailing lead lines 83 of the flat wire 13 are drawn along the respective guide grooves 91 formed on the outer peripheral portion of the outer frame body 9b.

  FIGS. 6A and 6B show a state in which the first V-phase cassette coil 81 is attached to the stator 2, and the V-phase cassette coil 81 is shifted over the U-phase cassette coil 81. As shown in FIG. 7B, which is a cross-sectional view taken along the line D-D of FIG. 6A, the connecting wire 82 extends along the guide groove 14b of one inner locking body 10b. The leading and trailing lead wires 83 of the flat wire 13 are drawn out along respective guide grooves 91 formed on the outer peripheral portion of the outer frame 9b.

  FIGS. 7A and 7B show a state in which the W-phase first cassette coil 81 is further attached to the stator 2, and the W-phase cassette coil 81 is placed on the V-phase cassette coil 81 on the U-phase. As shown in FIG. 5B, which is a cross-sectional view taken along the line E-E of FIG. 5A, the connecting wire 82 is connected to one inner side of the V-phase cassette coil 81. Arranged along the guide groove 14a of the stationary body 10a, the leading and trailing lead lines 83 of the flat wire 13 are drawn out along the respective guide grooves 91 formed on the outer peripheral portion of the outer frame body 9a.

  8 (a) and 8 (b) show a state in which the first U-phase cassette coil 81 of the remaining half circumference is attached to the stator 2, and is a cross-sectional view taken along line FF in FIG. 8 (a). As shown in FIG. 2B, the crossover wire 82 is disposed along the guide groove 14c of the other inner locking body 10c, and the leading end and the end leading line 83 of the flat wire 13 are the outer peripheral portion of the outer frame body 9a. The first U-phase cassette coil 81 is pulled out to substantially the same position as the first U-phase cassette coil 81. Since the two lead lines 83 of each phase of the remaining half circumference are routed from the left and right directions of the outer frame body 9b, the number of guide grooves 91 of the outer frame body 9a is half that of the outer frame body 9b. There are three.

  FIGS. 9A and 9B show a state in which the remaining half-circular V-phase cassette coil 81 is attached to the stator 2, and this V-phase cassette coil 81 is the remaining half-circular U-phase cassette coil. As shown in FIG. 5B, which is a cross-sectional view taken along line GG in FIG. 4A, the connecting wire 82 is connected to the other side of the U-phase cassette coil 81. Arranged along the guide groove 14b of the inner locking body 10b, the lead wire 83 at the start and end of the flat wire 13 is the first along each guide groove 91 formed on the outer periphery of the outer frame 9a. The V-phase cassette coil 81 is pulled out to almost the same position.

  FIGS. 10A and 10B show a state in which the remaining half-circular W-phase cassette coil 81 is attached to the stator 2, and this W-phase cassette coil 81 is the above-mentioned remaining half-circular V-phase cassette. The coil 81 is mounted on the U-phase and V-phase cassette coils 81 so as to overlap with the U-phase and V-phase cassette coils 81. As shown in FIG. The wire 82 is disposed along the guide groove 14a of the other inner locking body 10a, and the leading and trailing lead lines 83 of the flat wire 13 are formed in the respective guide grooves 91 formed on the outer peripheral portion of the outer frame 9a. The first W-phase cassette coil 81 is pulled out to substantially the same position.

  Then, the terminal portions corresponding to the half circumferences of the respective phases drawn out to the outer frame bodies 9a and 9b are connected in series or in parallel, the mounting of the cassette coil 81 on the front side of the stator 2 is finished, and the same applies to the back side of the stator 2 as well. Thus, the cassette coil 81 for each phase is mounted.

  In the case of the axial gap motor 1 assembled in this way, (1) the exciting coils 8u to 8w on the front and back of the stator 2 are formed by concentrated winding with a so-called alpha winding of a flat wire 13, so that a round wire of nozzle winding There is no need to provide a nozzle gap as in the case where the exciting coil is formed of the coil body, and the occupation ratio of the exciting coils 8u to 8w with respect to the area of the stator 2 is increased. Further, the alpha-wound coil body of the rectangular wire 13 does not swell toward the inner peripheral side and the outer peripheral side like the round wire coil body, and in particular, the space between the inner peripheral side of the stator 2 and the motor shaft 4 is narrowed to reduce the axial gap. The physique of the motor 1 can be reduced.

  (2) Since each of the exciting coils 8u to 8w is formed by the cassette coil 81 and can be easily attached to each of the teeth on the front and back of the stator 2, the assembly of the axial gap motor 1 is improved and the productivity is increased.

  (3) Since the winding start and end of the flat wire 13 of each cassette coil 81 are both on the outer peripheral side, there is no need to route the wound flat wire 13 from the inner peripheral side of the stator 2 to the outer peripheral side. Therefore, it is not necessary to route the rectangular wire 13 in the direction of the motor shaft 4, and the size of the axial gap motor 1 does not increase in the direction of the motor shaft 4. Specifically, if the rectangular wire 13 is routed from the inner peripheral side to the outer peripheral side of the stator 2, the gap (gap) between the stator 2 and the rotors 3a and 3b needs to be increased by the thickness of the rectangular wire 13, Further, it is necessary to secure a gap corresponding to the thickness of the flat wire 13 on the outer peripheral side of the stator 2, but in the present embodiment, it is not necessary to route the flat wire 13 from the inner peripheral side of the stator 2 to the outer peripheral side. Therefore, the physique of the motor 2 is reduced both in the motor axial direction and in the radial direction.

  (4) Since the rectangular wire 13 is alpha-wound to form the exciting coils 8u to 8w of the cassette coils 81, the corner portions of the exciting coils 8u to 8w, the crossover wire 82, the lead wire 83, etc. can be easily bent and thickened. The exciting coils 8u to 8w and the like can be easily formed without increasing the thickness, and the axial gap motor 1 is further reduced in size and weight.

  (5) Since the exciting coils 8u to 8w of the two magnetic poles in the half circumference of each phase are continuously formed by one cassette coil 81 of the same rectangular wire 13, respectively, the bus ring is partially However, the number of parts can be further reduced, and the axial gap motor 1 can be reduced in size and weight, and cost can be reduced.

  (6) The exciting coils 8 u to 8 w of each cassette coil 81 are insulated by the insulator 7. Further, the connecting wire 82 and the lead wire 83 are held while being insulated by the partition walls of the guide grooves 14a to 14c and 91 at different positions in the radial direction and the motor shaft 4 direction on the inner and outer peripheral sides of the stator 2. . In this case, a sufficient space distance and creepage distance can be secured between the connecting wires 82 and the lead wires 83 of different phases, and between the connecting wires 82 and the lead wires 83 and the excitation coils 8u to 8W of the other phases, and reliable insulation between the phases can be performed. The In addition, since the insulation of the crossover 82 is performed by the said partition, it is compact, and sufficient space can be ensured in the inner peripheral side of the stator 2, and the space of the axial magnetic path material 11 can be ensured in this embodiment. Further, there is an advantage that damage due to vibration or the like of the crossover 82 can be prevented, insulation reliability can be improved, and durability can be improved.

  (7) By providing the crossover wire 82 on the inner peripheral side of the stator 2, the wire length of each cassette coil 81 can be shortened, and the inner locking bodies 10 a to 10 c as the holding portions are also downsized.

  Therefore, it is possible to provide an unprecedented and exciting excitation coil structure that contributes to the reduction in size, weight and cost of the axial gap motor 1.

  The present invention is not limited to the above-described embodiments, and various modifications other than those described above can be made without departing from the spirit of the present invention. 8w may be formed by one flat wire 13 of three cassettes and four (all) in one cassette coil 82, and in that case, in order to ensure sufficient space distance and creepage distance, What is necessary is just to increase the number of guide grooves 10a-10c, 91, etc. suitably.

  The number of driving phases of the stator 2 and the number of magnetic poles of the stator 2 and the rotors 3a and 3b are not limited to the three-phase, 12-pole, etc. of the above-described embodiment. It may be.

  Next, the stator 2 may have a single-sided magnetic pole configuration in which a magnetic pole surface is formed only on one side of the front or back. In that case, for example, the axial gap motor 1 is formed by one stator 2 and a rotor 3a, respectively. The

  Next, according to the present invention, various axial gap motors having different magnetic pole structures of the stator 2 and the rotors 3a and 3b from the axial gap motor 1, for example, the magnetic poles of each phase in the circumferential direction of the stator 2 have S and N poles. The present invention can be similarly applied to an axial gap motor having a magnetic pole structure formed alternately, and also applied to a concentrated winding excitation coil structure of a radial gap motor in which the magnetic pole surface is disposed on the peripheral side surface of the stator 2. can do.

  The present invention can be applied to an axial gap motor for various uses such as a drive motor for an electric vehicle, and an exciting coil structure for a stator of a radial gap motor.

DESCRIPTION OF SYMBOLS 1 Axial gap motor 2 Stator 8u-8w Excitation coil 13 Flat wire 13a Flat wire coil 52, 62 Teeth 81 Cassette coil

Claims (1)

In a stator in which teeth of a plurality of magnetic poles around which excitation coils are concentrated are arranged in the circumferential direction,
The exciting coil is formed by a rectangular coil,
The rectangular wire coil is configured so that the winding direction of the rectangular wire is alternately changed from the outer peripheral side to the inner peripheral side and from the inner peripheral side to the outer peripheral side, with the wide surface facing the peripheral surface of each tooth. It is structured to start winding from the outer peripheral side and finish winding on the outer peripheral side,
And the said rectangular wire coil as said exciting coil of each said magnetic pole is formed at least one part continuously by the same rectangular wire, The stator characterized by the above-mentioned.

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