JP2008211892A - Axial gap type rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cancel a magnetic suction force acting in the axial direction as much as possible while suppressing an increase in the number of coils, in an axial gap type rotating electric machine equipped with winding stators at both sides of a rotor. <P>SOLUTION: A plurality of coils 50U, 50V and 50W, and coils 52U, 52V and 52W are distributively wound to a pair of the winding stators 30, 40 in a plurality of layers, and the layers are divided into two layers along a rotating shaft 18a, and arranged at the winding stators 30, 40, respectively. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an axial gap type rotating electrical machine.

  The axial gap type motor has a configuration in which a winding stator and a rotor are provided with a gap along a rotation axis.

  However, in the axial gap type motor, a suction force acts between the winding stator and the rotor along the rotation axis direction, so that the bearing loss is increased and the bearing life is shortened. There's a problem.

  As a prior art related to the invention of the present application, for example, there is one described in Patent Document 1.

  In Patent Document 1, in the single-phase induction motor, the first stator and the second stator are provided on both sides of the rotor along the rotation axis direction, the main winding is provided on the first stator, and the second A configuration in which an auxiliary winding is provided on a stator is disclosed.

JP-A-1-174248

  In the axial gap type motor, in order to prevent the force acting in the axial direction, for example, two rotors are provided on both sides of one winding stator along the rotational axis direction, or the rotational shaft is also the same. Along the direction, two winding stators are provided on both sides of one rotor, for example, to interact with each other so as to cancel the suction force acting at a plurality of locations, thereby reducing the total suction force in the axial direction. Such a configuration is proposed.

  However, in the configuration in which two rotors are provided as in the former case, twice as many permanent magnets are required. Further, since the shaft is fixed to the two rotors at two locations, the shaft holding configuration is complicated.

  Further, in the latter case, in the configuration in which two winding stators are provided, it is necessary to divide the coils into two winding stators, so that the number of coils is doubled and the coils are connected. There is. For this reason, there existed a problem that an assembly man-hour increase and a dead space increased.

  Incidentally, in the technique disclosed in Patent Document 1, a primary winding is provided on the first stator and an auxiliary winding is provided on the second stator. However, in the single-phase induction motor, the current that flows through the main winding is larger than the current that flows through the auxiliary winding. That is, Patent Document 2 does not disclose or suggest a technique for preventing a force acting in the axial direction in the first place.

  Accordingly, the present invention aims to cancel the magnetic attractive force acting in the axial direction as much as possible while suppressing an increase in the number of coils in an axial gap type rotating electrical machine provided with winding stators on both sides of the rotor. To do.

  In order to solve the above-mentioned problem, this axial gap type rotating electrical machine is arranged so as to be rotatable about a rotation shaft (18a) and has a plurality of poles around the rotation shaft (20, 20B, 20C, 20D, 220) and a pair of winding stators (30, 40, 30E, 40E, 30F, 40F, 230, 240) disposed with a gap on both sides of the rotor in the direction of the rotation axis, A plurality of coils (50U, 50V, 50W, 52U, 52V, 52W, 150CU, 150CV, 150CW, 152CU, 152CV, 152CW, 250U, 250V, 250W, 252U, 252V, 252W) ) Are distributed over an even number of layers along the rotation axis direction, and each coil is divided into two groups along the rotation axis direction. Is provided to the winding stator, and at the same position in the circumferential direction over the two groups, it is not wound coils of the same phase, but.

  In order to solve the above-mentioned problem, this axial gap type rotating electrical machine is disposed so as to be rotatable about a rotation axis (18a), and has (4 × N) poles (N is a positive integer) around the rotation axis. The rotor (20, 20B, 20C, 20D, 220) having a magnetic pole and a substantially disk-shaped back yoke magnetic core (32, 42) disposed on both sides of the rotor in the direction of the rotation axis with a gap therebetween. ), A plurality of winding stator core portions disposed around the rotation axis on the rotor side of the back yoke magnetic core, and N sets of three-phase coils (50U, 50V, 50W, 52U, 52V, 52W, 150CU, 150CV, 150CW, 152CU, 152CV, 152CW, 250U, 250V, 250W, 252U, 252V, 252W), respectively, Each of the winding stators has (3 × N) coil winding core portions (34, 44) around which the N sets of three-phase coils are wound as the plurality of winding stator core portions. , 134, 144, 134B, 144B, 134C, 144C, 234, 244) and (3 × N) inter-coil core portions (38, 48, 138B, 148B) provided between the coil winding core portions. 138C, 148C, 238, 248), which are coil winding core portions provided on one of the winding stators, and both circumferential ends (36a, 36c, 46a, 46c) are two coil winding core portions provided in the other winding stator, and the circumferential ends (36a, 46c) of the other two phases wound around the coil. 36c, 46a, 46c) Both of them are coil winding cores provided on one of the winding stators, and the substantially intermediate portions (36b, 46b) in the circumferential direction of the coil having a predetermined phase wound thereon are fixed to the other winding. The inter-coil core portion provided in the child, which exists between the coil winding core portions around which the coils of the other two phases are wound (38, 48, 138B, 148B, 138C, 148C, 238, 248).

  In this case, the rotor may have a plurality of magnetic poles represented by permanent magnets (22, 22D), and each magnetic pole may be substantially magnetically independent.

  The rotor may have a permanent magnet (22, 22D) that exhibits a magnetic pole with respect to the both-winding stator.

  The permanent magnet (22) may have anisotropy having an easy axis of magnetization along the rotation axis direction.

  Further, two coil windings provided on the other winding stator are provided at the tip of a coil winding core provided on one of the winding stators, in which a coil of a predetermined phase is wound. An end-side collar portion (37a, 37c, 47a, 47c, 137a, 137c, 147a, 147c) facing the circumferential end portion of the wound core portion in which the coils of the other two phases are wound; An intermediate collar portion opposed to the inter-coil core portion provided on the other winding stator, the coil being disposed between the coil winding core portions around which the other two phases of the coil are wound. (37b, 47b, 137b, 147b) are provided, and the end-side collar portion and the intermediate collar portion may be magnetically independent.

  Moreover, each collar part provided in the front-end | tip part of one said coil winding core part may be connected and integrated by the connection part (39Fa, 49Fa).

  Further, in a plane substantially orthogonal to the rotation axis, the cross-sectional area of the coil winding core part (134B, 144B) may be approximately three times the cross-sectional area of the inter-coil core part (138B, 148B). .

  Moreover, the outer peripheral part of the cross-sectional shape of the said coil | winding core part (134C, 144C) may have an outward convex shape in the plane substantially orthogonal to the said rotating shaft.

  Moreover, the clearance gap between the said coil winding core part (134C, 144C) and the said inter-coil core part (138C, 148C) may be formed in the groove shape of substantially equal width.

  The inter-coil core portions (138B, 148B) are located on the outer peripheral side of the coil winding core portions (134B, 144B) and between the coil winding core portions, and the arrangement portions of the coils. It may be provided in the gap excluding.

  The N may be an integer of 2 or more.

  The one winding stator (30, 40, 30E, 40E, 30F, 40F, 230, 240) includes at least the positions and shapes of the coil winding core portion and the inter-coil core portion, and the phase of each coil. Regarding the order and the number of turns, the other winding stator (30, 40, 30E, 40E, 30F, 40F, 230, 240) is based on the plane between the two winding stators that is substantially orthogonal to the rotation axis. Further, it may have a mirror surface target shape and a symmetry that is rotated by (180 / N) ° about the rotation axis.

  Each gap length between the pair of winding stators (30, 40, 30E, 40E, 30F, 40F, 230, 240) and the rotor (20, 20B, 20C, 20D, 220) is approximately It may be the same.

  The N is an integer of 2 or more, and a plurality of the coils connected in series in the same phase are provided in the both-winding stator, and the plurality of coils are the pair of winding stators. It may be connected (260) so as to connect them.

  Each coil of the pair of winding stators has one end of the coil winding drawn from one end in the circumferential direction and the other end of the coil winding drawn from the other end in the circumferential direction. The coils connected in series between the pair of winding stators are connected via close ends (60U, 60V) with reference to a distance projected on a plane substantially orthogonal to the rotation axis. , 60W, 260).

  The coils of the pair of winding stators may be connected (70) in parallel.

  The rotor has a plurality of permanent magnets arranged at intervals around the rotation axis, and is interposed between the permanent magnets and magnetically independent from the permanent magnets. A magnetic core (23D) may be interposed.

  According to this axial gap type rotating electrical machine, a plurality of coils are distributed and wound on the pair of winding stators over a plurality of layers along the rotation axis direction, and the coils are arranged along the rotation axis direction. Since the coils of the same phase are not wound at the same position in the circumferential direction across the two groups, separated into two groups of layers and wound on both sides of the rotor In an axial gap type rotating electrical machine provided with a stator, the magnetic attractive force acting in the axial direction can be canceled as much as possible while suppressing an increase in the number of coils.

  Further, according to another axial gap type rotating electric machine, the rotary electric machine is disposed so as to be rotatable around the rotation axis, and (4 × N) poles (N is a positive integer) around the rotation axis on both surfaces in the rotation axis direction. A rotor having a magnetic pole surface, a substantially disc-shaped back yoke magnetic core disposed on both sides of the rotor in the direction of the rotational axis, and the rotational shaft on the rotor side of the back yoke magnetic core A pair of winding stators having a plurality of winding stator core portions arranged along the periphery and N sets of three-phase coils, and winding stators are provided on both sides of the rotor. An axial gap type rotating electrical machine can be configured.

  In addition, the rotor has a magnetic pole face of (4 × N) poles, whereas the winding stator is provided with N sets of three-phase coils, so that the rotor is distributed as a whole (2 × N). Since it is the structure which provides a set of three-phase coils, an increase in the number of coils can be suppressed.

  In addition, the coil winding core portion provided in one of the winding stators, in which both end portions in the circumferential direction of the coil having a predetermined phase are wound are provided in the other winding stator. A coil winding core portion provided on one of the winding stators and facing a circumferential end portion of the coil winding core portion in which the coils of the other two phases are wound. The circumferential intermediate portion of the coil having the predetermined phase wound is the core portion between the coils provided in the other winding stator, and the other two phases of the coil are wound. Further, the magnetic attraction force acting in the axial direction can be canceled as much as possible because it is opposed to that existing between the coil winding core portions.

  Further, when the rotor has a plurality of magnetic poles represented by permanent magnets, the magnetic flux density can be increased.

  Further, if the rotor has a permanent magnet that exhibits magnetic poles with respect to the double-winding stator, the magnetic flux passes through the permanent magnet of the field element in each magnetic circuit, and between the two-winding stators. Will pass.

  Further, if the permanent magnet has anisotropy with an easy magnetization axis along the rotation axis direction, the permanent magnet can be strongly magnetized along the rotation axis direction, and in both gaps of both winding stators. Magnetic flux leakage can be reduced.

  In addition, when the end side flange portion and the intermediate flange portion are provided at the tip end portion of the coil winding core portion, the exchange of magnetic flux between both winding stators is the synthesis of the magnetic flux by both corresponding coils. The flow of the magnetic flux can be adjusted by each collar portion so as to be a magnetic flux.

  Moreover, when each collar part provided in the front-end | tip part of one said coil winding core part is connected and integrated by the connection part, they can be handled easily as an integral object, and gap accuracy is improved. It can be improved.

  Further, in a plane substantially orthogonal to the rotation axis, the cross-sectional area of the coil winding core portion is approximately three times the cross-sectional area of the inter-coil core portion, and the cross-sectional area of the magnetic circuit corresponding to each phase is By substantially the same, uneven magnetic flux density can be prevented and magnetic saturation can be prevented.

  In addition, when the outer peripheral portion of the cross-sectional shape of the coil winding core portion has an outwardly convex shape on a plane substantially orthogonal to the rotation axis, the coil winding closely contacts the outer periphery of the coil winding core portion. Thus, the coil space factor can be improved.

  When the gap between the coil winding core portion and the adjacent inter-coil core portion is formed in a groove shape having a substantially equal width, the coils can be densely arranged at the interval. The space factor can be improved.

  Further, the inter-coil core portion is provided on the outer peripheral side of the respective coil winding core portions and between the respective coil winding core portions and in a gap excluding an arrangement portion of the respective coils. The coil winding core portion can be provided by effectively using the gap between the coils.

  Further, when N is an integer of 2 or more, the force acting in the circumferential direction can be balanced in each winding stator.

  The one winding stator rotates the other winding stator with respect to the position and shape of at least the coil winding core part and the inter-coil core part and the phase sequence and the number of turns of each coil. If the mirror surface is shaped as a mirror surface with reference to the plane between the two winding stators substantially orthogonal to the axis, and further has a symmetry of being rotated (180 / N) ° about the rotation axis, Since the winding stator generates magnetic flux under substantially the same conditions, it is possible to easily generate a composite magnetic flux suitable for rotating the rotor.

  Further, if the gap lengths between the pair of winding stators and the rotor are substantially the same, a similar magnetic circuit can be formed on both sides of the rotor.

  In addition, a plurality of the coils connected in series in the same phase are provided in the both-winding stator, and the plurality of coils are connected so as to connect the pair of winding stators. As compared with the case where coils of the same phase are connected only in each winding stator, the cross wiring connecting the coils can be shortened.

  Each coil of the pair of winding stators has one end of the coil winding drawn from one circumferential end and the other end of the coil winding drawn from the other circumferential end. In this case, since a coil having the same configuration can be used, productivity is improved. Further, when the coils connected in series between the pair of winding stators are connected via close ends based on a distance projected on a plane substantially orthogonal to the rotation axis, Wiring can be made shorter.

  Further, when each coil is star-connected (70) in each of the winding fixings, the wiring between the pair of winding stators can be reduced.

  The rotor has a plurality of permanent magnets arranged at intervals around the rotation axis, and an intervening magnetic core that is magnetically independent from each permanent magnet is interposed between the permanent magnets. If intervened, reluctance torque can be used together by utilizing the intervening magnetic core.

{First embodiment}
Hereinafter, the axial gap type rotating electrical machine according to the first embodiment will be described. FIG. 1 is an exploded perspective view showing the axial gap type rotating electrical machine, and FIG. 2 is a side view showing the axial gap type rotating electrical machine.

  The axial gap type rotating electrical machine 10 generates a rotational force around a predetermined rotation shaft 18a, and includes one rotor 20 and two winding stators 30 and 40. The rotor 20 is formed in a substantially disk shape, is rotatably disposed around a predetermined rotation shaft 18a, and alternately presents a plurality of magnetic poles around the rotation shaft 18a. The winding stators 30 and 40 are also formed in a substantially disk shape, and are disposed with a gap on both sides of the rotor 20 in the direction of the rotation shaft 18a. When the pair of winding stators 30 and 40 is viewed as a whole, the plurality of coils 50U, 50V, and 50W and the coils 52U, 52V, and 46W are distributedly wound over a plurality of layers (here, two layers). Yes. Further, these coils 50U, 50V, 50W and coils 52U, 52V, 52W are separated into two groups of layers (here, separated into two layers) and provided in the respective winding stators 30, 40, In addition, coils of the same phase (U phase, V phase, W phase, etc.) are not wound around the two groups at the same position in the circumferential direction around the rotation shaft 18a. The coils 50U, 50V, and 50W and the coils 52U, 52V, and 52W are energized with a three-phase alternating current to generate a magnetic flux that rotates the rotor 20 around the rotation shaft 18a.

  Each part will be described more specifically.

  FIG. 3 is a partially exploded perspective view of the rotor, and FIG. 4 is a perspective view showing the rotor. As shown in FIGS. 1 to 4, the rotor 20 is rotatably arranged via a rotation shaft portion (not shown). Note that the rotating shaft portion is rotatably supported by a bearing (not shown). Further, the rotor 20 exhibits magnetic pole surfaces having alternating magnetism around the rotation shaft 18a on both surfaces in the direction of the rotation shaft 18a. Here, each magnetic pole surface of the rotor presents alternating magnetic poles of (4 × N) poles (N is a positive integer, here N = 1) around the rotation axis 18a.

  More specifically, the rotor 20 has a plurality (four in this case) of permanent magnets 22. Each permanent magnet 22 is formed in a shape obtained by dividing a donut plate-shaped member around the rotation shaft 18a into a plurality (here, four), that is, an arc-like and strip-like plate shape extending around the rotation shaft 18a. In addition, the permanent magnets 22 are arranged around the rotation shaft 18a at intervals, and the permanent magnets 22 are substantially magnetically independent by the intervals. Thereby, the ineffective magnetic flux by the leakage of magnetic flux can be reduced. Thus, since the magnetic field is generated by the permanent magnet 22, the magnetic flux density in each magnetic circuit can be increased.

  Further, each permanent magnet 22 exhibits a magnetic pole with respect to both sides thereof, that is, with respect to the respective winding stators 30 and 40. Thereby, in each magnetic circuit passing through each permanent magnet 22, the magnetic flux passes through the permanent magnet 22 as a field element and passes between both winding stators 30 and 40.

  The permanent magnet 22 as described above attaches an anisotropic magnetic material having an easy magnetization axis along the direction of the rotation axis 18a, that is, along the thickness direction of the permanent magnet 22 along the direction of the rotation axis 18a. It is preferably formed by magnetizing. As a result, the permanent magnet 22 can be strongly magnetized along the direction of the rotating shaft 18a, and leakage of magnetic flux can be reduced in the gaps on both the winding stators 30 and 40 side.

  Further, a rotor magnetic core 26 is provided on both surfaces of each permanent magnet 22, that is, on the surfaces on both winding stators 30 and 40 side. Each rotor magnetic core 26 is formed in an arc-like and strip-like plate shape corresponding to the shape of each permanent magnet 22, and is arranged on both surfaces of the permanent magnet 22 in a superposed manner. These rotor magnetic cores 26 are also arranged around the rotation axis 18a at intervals, and are magnetically independent from each other.

  The rotor magnetic core 26 reduces the influence of the demagnetizing field acting on each permanent magnet 22 when the demagnetizing field acts on the rotor 20 by the external magnetic field of the excited winding stators 30, 40. It is possible to prevent each permanent magnet 22 from demagnetizing.

  The rotor magnetic core 26 is preferably made of a material having a high resistivity, for example, a dust core. Thereby, the reduction effect of the eddy current generated in the rotor magnetic core 26 can be expected. In particular, for example, the magnetic flux of the carrier high frequency component generated by the winding stators 30 and 40 by the PWM inverter drive hardly acts to the permanent magnet 22, and the eddy current due to the magnetic flux is near the surface of the rotor core 26 due to the skin effect. It is easy to generate in. Therefore, by forming the rotor magnetic core 26 with a material having a high resistivity, it is possible to effectively reduce such high-frequency component eddy currents.

  Each permanent magnet 22 and each rotor magnetic core 26 are held in the above-described arrangement by a holder 28 formed of a non-magnetic material such as resin or non-magnetic metal (see FIG. 4), and a rotating shaft. It is fixed to the part. The holder 28 may be molded together with the permanent magnets 22 and the rotor magnetic cores 26, or the permanent magnets 22 and the rotor magnetic cores 26 and the like may be formed on a holder 28 that has been molded in advance. The structure fixed by inserting etc. may be sufficient.

  The double-winding stators 30 and 40 will be described.

  FIG. 5 is an explanatory diagram showing a state in which a three-phase alternating current is applied to the axial gap type rotating electrical machine and a connection mode. In FIG. 5, among the codes indicating the winding stator core portions, the first code is one (lower), and the second code is the other (upper). Further, in FIG. 5, for easy understanding, reference numerals T <b> 1 to T <b> 12 are attached to the respective positions of the divided coil winding core portions 36 a, 36 b, 36 c, 46 a, 46 b, 46 c and the inter-coil core portions 38, 48. is doing.

  As shown in FIGS. 1, 2, and 5, one (here, lower) winding stator 30 includes a back yoke magnetic core 32, and a plurality (here, twelve) winding stator core portions 34, 38 and N sets (here, 1 set) of three-phase coils 50U, 50V, and 50W.

  The back yoke magnetic core 32 is formed of a soft magnetic material such as iron, and is formed in a substantially disc shape with a hole formed in a substantially central portion. The back yoke magnetic core 32 may be formed of any one of a dust core, a laminated steel plate, and the like. The winding stator core portions 34 and 38 are supported in a protruding manner on the surface of the back yoke magnetic core 32 on the rotor 20 side.

  Each of the winding stator core portions 34 and 38 is formed of a soft magnetic material such as iron, and is arranged on the surface of the back yoke magnetic core 32 on the rotor 20 side in an annular shape with a space around the rotation shaft 18a. Has been.

  The winding stator core portions 34 and 38 include (3 × N) (here, three) coil winding core portions 34 and (3 × N) (here, three) inter-coil core portions. 38.

  Each coil winding core portion 34 has three divided coil winding core portions 36a, 36b, and 36c that are adjacently arranged in an arc with a space therebetween. Each of the coil winding cores 34 is prepared in the number corresponding to the three-phase coils 50U, 50V, and 50W (three in this case), and around the rotating shaft 18a on the surface of the back yoke magnetic core 32 on the rotor 20 side. Are arranged in an annular shape at substantially equal intervals. The three-phase coils 50U, 50V, and 50W are wound around each of the coil winding core portions 34, that is, around the outer periphery of each of the three adjacent divided coil winding core portions 36a, 36b, and 36c. Turned. Here, the three-phase coils 50U, 50V, and 50W are viewed from above along the direction of the rotation axis 18a, and the U-phase coil 50U, the V-phase coil 50V, and the W-phase coil 50W are clockwise in this order ( (Clockwise) are arranged in a line.

  The inter-coil core portions 38 are provided in the same number as the coil winding core portions 34, and are arranged at intervals between the coil winding core portions 34. The interval between the coil winding core portion 34 and the inter-coil core portion 38 is set to be substantially equal in width along the radial direction of the back yoke magnetic core 32. Further, no coil is wound around the inter-coil core portion 38.

  Further, the divided coil winding core portions 36a, 36b, 36c and the inter-coil core portion 38 constituting the coil winding core portion 34 are each an isosceles triangle or fan-shaped apex in a plane substantially orthogonal to the rotating shaft 18a. And has a cross-sectional shape that is rounded, and is arranged in a posture that gradually widens outward from the rotating shaft 18a. The split coil winding core portions 36a, 36b, 36c and the inter-coil core portion 38 are fixed to the back yoke magnetic core 32. For example, each split coil winding is provided in a through-hole portion or a bottomed hole portion formed in the back yoke magnetic core 32. This is done by press-fitting or shrink-fitting the cores 36a, 36b, 36c and the inter-coil core 38.

  The other winding stator 40 has the same configuration as the one winding stator 30, that is, the back yoke magnetic core 42 corresponding to the back yoke magnetic core 32, and the three divided coil winding core portions 36 a, 36 b, 36 c. Corresponding to the coil winding core portion 34 having three coil winding core portions 44 having three divided coil winding core portions 46a, 46b, 46c, inter-coil core portion 48 corresponding to the inter-coil core portion 38, three-phase Three-phase coils 52U, 52V, and 52W corresponding to the coils 50U, 50V, and 50W.

  The other winding stator 40 includes winding stator core portions 44 and 48 including a coil winding core portion 44 and an inter-coil core portion 48, and three-phase coils 50U, 50V, and 50W on the rotor 20 side. Is disposed above the rotor 20 with a gap therebetween.

  The positional relationship between the two winding stators 30 and 40 is as follows.

  First, the inter-divided coil core portion 36a, which is a coil winding core portion 34 provided in one winding stator 30 and is a circumferential end portion of a coil in which coils 50U, 50V, 50W of predetermined phases are wound. 36c is a coil winding core portion 44 provided on the other winding stator 40, and is a divided core portion which is a circumferential end portion of the other two-phase coils 52U, 52V, 52W wound 46c and 46a.

  For example, as shown in FIG. 5, the coil winding core portion 34 provided in the lower winding stator 30, and the core between the divided coils that is the circumferential end portion of the U-phase coil 50 </ b> U wound thereon. The portions 36a and 36c are coil winding core portions 44 provided on the other winding stator 40, and the other two V-phase and W-phase coils 52V and 52W are wound around the circumferential ends. Is opposed to the split core portions 46c and 46a.

  The coil winding core portion 34 provided on one winding stator 30 is a divided coil winding core portion that is a substantially intermediate portion in the circumferential direction of the coil 50U, 50V, 50W of a predetermined phase. 34b is an inter-coil core portion 48 provided in the other winding stator 40, and exists between the coil winding core portions 44 around which the other two-phase coils 52U, 52V, 52W are wound. Opposite things.

  For example, as shown in FIG. 5, it is a coil winding core portion 34 provided on one (lower) winding stator 30 and is a substantially intermediate portion in the circumferential direction of a U-phase coil 50U wound thereon. The split coil winding core portion 34b is an inter-coil core portion 48 provided in the other winding stator 40, and the coil winding core portion 44 around which the other two phase coils 52V and 52W are wound. Opposing to something in between.

  It should be noted that the same positional relationship is obtained with reference to the other winding stator 40 and with reference to any of the U phase, V phase, and W phase.

  Further, the coils 50U, 50V, 50W on the one winding stator 30 side and the coils 52U, 52V, 52W on the other winding stator 40 side are from one side of the rotating electrical machine 10 in the direction of the rotating shaft 18a. It is wound in the same direction as seen (for example, seen from above). In other words, when viewed from the rotor 20, the coils 50U, 50V, 50W on the one winding stator 30 side and the coils 52U, 52V, 52W on the other winding stator 40 side are opposite to each other. It is wound around. In addition, the winding direction here means not a mechanical direction at the time of actual winding but a direction based on the energization direction of each phase. Therefore, when wound in the same direction as viewed from one side of the rotating electrical machine 10 in the direction of the rotating shaft 18a (for example, viewed from above), the coils 50U and 52U of a predetermined phase, for example, U-phase, are wound. When the maximum current is applied, reverse currents flow through the other two phases, for example, the V-phase and W-phase coils 50V, 50W, 52V, and 52W. Therefore, in this case, the magnetic flux of the other two phases, for example, the V-phase and W-phase coils 50V, 50W, 52V, and 52W, with respect to the direction of the magnetic flux in a predetermined phase, for example, the U-phase coils 50U and 52U. The direction is reversed.

  That is, the both-winding stators 30 and 40 include at least the positions and shapes of the coil winding core portions 34 and 44 and the inter-coil core portions 38 and 48 and the coils 50U, 50V, 50W, and the coils 52U, 52V, 52W. With respect to the phase sequence and the number of turns, the mirror is symmetrical with respect to the plane between the two winding stators 30 and 40 substantially orthogonal to the rotating shaft 18a, and (180 / N) ° around the rotating shaft 18a (here In this case, N = 1 to 180 °), that is, a symmetry that is rotated by one cycle at an electrical angle.

  In addition to the arrangement relationship between the two winding stators 30 and 40, each permanent magnet 22 of the rotor 20 has a magnetic pole with respect to both sides thereof. Toward the other winding stator 40 (or from the other winding stator 40 toward one winding stator 30), the magnetic flux passes through the rotor 20. That is, even if the coils 50U, 50V, 50W, 52U, 52V, and 52W are provided separately for the two winding stators 30 and 40, the rotor 20 can be rotated by their combined magnetic fields.

  The manner in which the magnetic field is generated by each coil winding core 44 and each inter-coil core 48 will be described more specifically with reference to FIG.

  Between the split coil winding core part 36b at the substantially central part of each coil winding core part 34 around which the U-phase coils 50U and 52U are wound and the inter-coil core part 48 facing this (see T1 and T7). Magnetic flux generated by the U-phase current passes.

  Similarly, between the divided coil winding core portion 36b at the substantially central portion of each coil winding core portion 34 around which the V-phase coils 50V and 52V are wound, and between the inter-coil core portion 48 (T5 and T11). The magnetic flux generated by the V-phase current passes, and the split coil winding core portion 36b at the substantially central portion of each coil winding core portion 34 around which the W-phase coils 50W and 52W are wound, Between the opposing inter-coil core portions 48 (see T3 and T9), the magnetic flux generated by the W-phase current passes.

  Moreover, the opposing part (refer T12) of the division | segmentation coil winding core part 36a and the division | segmentation coil winding core part 46c which are the parts which U phase coils 50U and 52U and V phase coils 50V and 52V overlap, division coil winding In the facing portion (see T6) between the rotating core portion 36c and the split coil winding core portion 46a, the magnetic flux generated by the U-phase current and the V-phase current is passed.

  Similarly, the opposing portion (see T4) of the split coil winding core portion 36a and the split coil winding core portion 46c, which is a portion where the V phase coils 50V and 52V and the W phase coils 50W and 52W overlap, and the split coil In the facing portion (see T10) between the wound core portion 36c and the split coil wound core portion 46a, the magnetic flux generated by the V-phase current and the W-phase current is passed.

  Similarly, the opposing portion (see T8) of the split coil winding core portion 36a and the split coil winding core portion 46c, which are portions where the W phase coils 50W, 52W and the U phase coils 50U, 52U overlap. In the facing portion (see T2) between the split coil winding core portion 36c and the split coil winding core portion 46a, the magnetic flux generated by the W-phase current and the U-phase current is passed.

  FIG. 6 is a diagram showing the relationship between the winding form of the coil and the generated magnetic flux in this axial gap type rotating electrical machine. FIG. 6 shows a state where each winding stator core portion and the annular arrangement direction of the coils are partially repeated and developed in a planar shape, and each coil is conceptually shown.

  That is, paying attention to the case where the maximum current in a predetermined direction is applied to the W phase, from the split coil winding core part 36b in the middle part of the coil winding core part 34 toward the inter-coil core part 48 facing this, A magnetic flux Φ3 obtained by superimposing the magnetic flux Φ2 generated by the permanent magnet 22 on the magnetic flux Φ1 passes.

  On the other hand, the U-phase coils 50U and 52U and the V-phase coils 50V and 52V are energized in the reverse direction, and the U-phase coils 50U and 52U and the V-phase coils 50V and 52V Magnetic fluxes Φ4 and Φ5 in the opposite direction to Φ1 are generated. In the portion where the U-phase coils 50U and 52U and the V-phase coils 50V and 52V overlap each other, the magnetic fluxes Φ4 and Φ5 are superimposed, and the magnetic flux Φ7 superimposed with the magnetic flux Φ6 by the permanent magnet 22 is between them. Pass through.

  Here, since Iv = −Iw−Iu (Ix is a current flowing through the x phase), the magnetic flux passing between one winding stator 30 and the other winding stator 40 is Φ3 = Φ7. The magnetic flux having almost the same magnitude is transmitted between the winding stators 30 and 40.

  When the maximum current in the reverse direction is supplied to the W phase and the maximum current is supplied to the U phase and V phase in the predetermined direction and the reverse direction, magnetic flux is generated and passed in the same manner.

  Therefore, when a three-phase alternating current is applied, a magnetic flux that periodically changes around the rotation shaft 18a is generated by the two winding stators 30 and 40, and this changes with time to rotate the rotor 20.

  Such an arrangement form of the coils 50U, 50V, 50W, 52U, 52V, and 52W can be evaluated as being equivalent to the following distributed winding form of the usual four poles and 12 teeth. In other words, in the normal 4-pole 12-tooth distributed winding configuration, coils having the number of poles (four) per phase are arranged at equal intervals and stacked in three layers for three phases. With such an arrangement, symmetry on both sides of the rotor 20 cannot be maintained. Therefore, the coils 50U, 50V, 50W and 52U, 52V, 52W are divided into two layers, and the coils 50U, 50V, 50W and 52U, 52V, 52W are provided with the inter-coil core portions 38, 48 interposed in each layer. Thus, the number of poles / 2 (here, two) coils 50U, 50V, 50W and 52U, 52V, 52W are provided for each phase. As a result, the coils 50U, 50V, 50W and 52U, 52V, 52W can be divided and arranged on both winding stators 30, 40, and can be arranged on both sides of the rotor 20 with good symmetry. If the coils 52U, 52V, and 52W are slid as they are onto the winding stator 30, the winding distribution of normal distributed winding is obtained with one stator.

  Further, among the divided coil winding core portions 36a, 36c, 46a, and 46c, end portion side flange portions 37a, 37c, 47a, and 47c that extend outward are provided at the end portions on the rotor 20 side. The end side flange portions 37a, 37c, 47a, 47c are opposed to the corresponding divided coil winding core portions 36a, 36c, 46a, 46c via the rotor 20. In addition, intermediate collar portions 37b and 47b that extend outward are formed at the rotor 20 side end portions of the split coil winding core portions 36b and 46b. The intermediate collar portions 37 b and 47 b are opposed to the corresponding inter-coil core portions 38 and 48 through the rotor 20. Further, flange portions 39 and 49 extending outwardly are formed at end portions on the rotor 20 side of the inter-coil core portions 38 and 48, and these are divided coil winding cores corresponding to the rotor 20 via the corresponding portions. It faces the parts 36b, 46b.

  Further, these end side collar portions 37a, 37c, 47a, 47c, intermediate collar portions 37b, 47b, and collar portions 39, 49 are separated through a slit and are substantially magnetically independent from each other. is doing.

  These end side collar portions 37a, 37c, 47a, 47c, intermediate collar portions 37b, 47b, and collar portions 39, 49 are divided coil winding core portions 36a, 36c, 46a, 46c and divided coil windings. The core portions 36b and 46b and the inter-coil core portions 38 and 48 are integrally formed. In addition, by forming the divided coil winding core portions 36a, 36c, 46a, 46c, the divided coil winding core portions 36b, 46b, and the inter-coil core portions 38, 48 with a dust core, the end side flange portion is formed. 37a, 37c, 47a, 47c, intermediate collar portions 37b, 47b, and collar portions 39, 49 can be easily formed integrally.

  By these end-side collar portions 37a, 37c, 47a, 47c, intermediate collar portions 37b, 47b, and collar portions 39, 49, the linkage flux is increased between the rotor 20 and the winding stators 30, 40. Can be achieved. Moreover, the substantial gap length between both can be made smaller by raising the flatness of the winding stators 30 and 40 with respect to the rotor 20. In particular, due to the slit existing between them, the exchange of magnetic flux between the two winding stators 30 and 40 becomes the combined magnetic flux of the magnetic fluxes by the corresponding coils 50U, 50V, 50W and 52U, 52V, 52W. Thus, the flow of magnetic flux can be adjusted.

  According to the axial gap type rotating electrical machine 10 configured as described above, a plurality of coils 50U, 50V, 50W and coils 52U, 52V, 52W are distributed over a plurality of layers on the pair of winding stators 30, 40. At the same time, they are separated into two groups along the direction of the rotary shaft 18a and are provided on the respective winding stators 30 and 40. For this reason, in the rotating electrical machine 10 in which the winding stators 30 and 40 are provided on both sides of the rotor 20, the magnetic attractive force acting by one winding stator 30 and the magnetic force acting by the other winding stator 40. The thrust force can be reduced by canceling the suction force as much as possible.

  In particular, the rotor 20 exhibits a (4 × N) pole face around the rotation axis 18a, whereas the winding stators 30 and 40 have N sets of three-phase coils 50U, 50V, 50W and a coil 52U. , 52V, and 52W are provided so that (2 × N) sets of three-phase coils are provided as a whole. Therefore, compared to the case where the magnetic circuit for rotating the rotor 20 is formed on both sides of the rotor 20, respectively. Thus, an increase in the number of coils can be suppressed.

  Moreover, the inter-divided coil core portion 36a, which is a coil winding core portion 34 provided in one winding stator 30 and is a circumferential end portion of the coil 50U, 50V, 50W having a predetermined phase wound thereon, 36c is a coil winding core portion 44 provided on the other winding stator 40, and is a divided core portion which is a circumferential end portion of the other two-phase coils 52U, 52V, 52W wound It faces 46a and 46c. The coil winding core portion 34 provided on one winding stator 30 is a divided coil winding core portion that is a substantially intermediate portion in the circumferential direction of the coil 50U, 50V, 50W of a predetermined phase. 34b is an inter-coil core portion 48 provided in the other winding stator 40, and exists between the coil winding core portions 44 around which the other two-phase coils 52U, 52V, 52W are wound. Opposite things. For this reason, the magnetic attraction force acting in the axial direction can be made the same on both sides of the rotor 20 as much as possible, and the magnetic attraction force can be canceled as much as possible.

  Further, as described above, since the both-winding stators 30 and 40 have a mirror-symmetric symmetry and are rotated as described above, the both-winding stators 30 and 40 generate magnetic flux under substantially the same conditions. Therefore, it is possible to easily generate a synthetic magnetic field suitable for smoothly rotating the rotor 20.

  The gap lengths between the pair of winding stators 30 and 40 and the rotor 20 are preferably substantially the same. This is because a similar magnetic circuit is formed on both sides of the rotor 20.

  The basic configuration of this axial gap type rotating electrical machine is as described above. In the following, a preferred specific configuration or a preferred modification will be described on the basis of the above configuration. In the following description, elements similar to those described above are denoted by the same reference numerals and description thereof is omitted.

  FIG. 7 shows a modification of the rotor. In this modification, the rotor 20B is formed by magnetizing a ring-shaped magnetic material alternately in opposite polarities for each area divided along the circumferential direction. In addition, the part attached to the rotating shaft part of the rotor 20B may not be magnetized or may be magnetized, but does not contribute to torque generation. Further, the portion magnetized in the circumferential direction of the rotor 20B is a non-magnetized portion. This modification is effective in the case of using a bonded magnet having excellent flexibility in shape processing.

  8 and 9 show other modified examples of the rotor. In the rotor 20C of this modification, the permanent magnets 22 are held in a predetermined arrangement form so as to be sandwiched between a pair of rotor magnetic cores 26C. Each rotor magnetic core 26 </ b> C has wide portions 26 </ b> Ca and 26 </ b> Cb corresponding to the respective permanent magnets 22, and these are connected via a connecting portion 26 </ b> Cc. The connecting portion 26Cc is narrow or thin and has a cross-sectional area that can be easily magnetically saturated. Further, the wide portion 26Ca corresponding to one of the wide portions 26Ca and 26Cb is connected to each other by the inner ring portion 26Cd around the rotation shaft portion on the inner peripheral side, and is fixed to the rotation shaft portion. Thus, each permanent magnet 22 can be held without the need for providing a holder or the like separately. In addition, since each wide part 26Ca respond | corresponds to the same magnetic pole, even if it connects mutually as mentioned above, the magnetic flux leakage is prevented.

  FIG. 10 shows still another modification of the rotor. The rotor 20D according to this modification has an intervening magnetic core. That is, the rotor 20D includes a plurality (here, four) of permanent magnets 22D disposed at intervals on the rotation shaft 18a, and between the permanent magnets 22D, A magnetically independent intervening magnetic core 23D is interposed. The intervening magnetic core 23D faces both the winding stators 30 and 40. That is, the permanent magnets 22D and the intervening magnetic cores 23D are annularly and alternately arranged around the rotation shaft 18a. Each permanent magnet 22D and the intervening magnetic core 23D are held in a magnetically independent state by a holder (not shown) formed of a non-magnetic material. As the intervening magnetic core 23D, for example, an isotropic soft magnetic material such as a dust core is preferably used. It should be noted that both ends of the intervening magnetic core 23D on the side of the both-winding stators 30 and 40 are formed wider than the other portions so that more magnetic flux can be guided.

By providing the intervening magnetic core 23D, the q-axis inductance Lq indicating the gap between the poles can be made larger than the d-axis inductance Ld indicating the magnetic pole center by the permanent magnet 22D, and the reverse saliency (Lq> Ld) can be increased. Show. For this reason, by controlling the current phase with an appropriate advance angle with respect to the q axis, so-called reluctance torque can be further added to so-called magnet torque, and torque and energy efficiency can be increased. In general, the torque equation is: Here, the reluctance torque of the second term can be used by setting Lq> Ld.
_{T-Pn [φ a I a} cosβ + 0.5 (Lq-Ld) I a 2 sin (2β)]
Here, Pn is the number of pole pairs, φ _{a is the} armature flux linkage, I _{a is the} current value, and β is the current phase.

  FIG. 11 shows a modification of the winding stator. In the winding stators 30E and 40E according to this modification, the end side collar portions 37a, 37c, 47a, and 47c, the intermediate collar portions 37b and 47b, and the collar portions 39 and 49 in the above embodiment are omitted. Yes. In this manner, the end side collar portions 37a, 37c, 47a, 47c, the intermediate collar portions 37b, 47b, and the collar portions 39, 49 are not essential.

  FIG. 12 shows another modification of the winding stator. In the winding stators 30F and 40F according to this modification, the end-side flange portions 37a, 37c, 47a, and 47c, the intermediate flange portions 37b and 47b, and the flange portions 39 and 49 are respectively connected to the inner peripheral side. And on the outer peripheral side, they are connected by connecting portions 39Fa and 49Fa. The connecting portions 39Fa and 49Fa are narrow or thin, and have a cross-sectional area that can be easily magnetically saturated.

  According to this modification, the end side flange portions 37a, 37c, 47a, 47c, the intermediate flange portions 37b, 47b, and the flange portions 39, 49 can be easily handled as an integrated object. Moreover, since they can be handled as an integrated object, the accuracy of each gap can be improved.

  Although it is not necessary to connect all the end side collar portions 37a, 37c, 47a, 47c, the intermediate collar portions 37b, 47b, and the collar portions 39, 49 with the coupling portions 39Fa, 49Fa, the coil winding It is preferable that the end side collar portions 37a, 37c, 47a, 47c and the intermediate collar portions 37b, 47b provided at the distal ends of the core portions 34, 44 are connected and integrated by connecting portions 39Fa, 49Fa.

  In the above embodiment, the back yoke magnetic cores 32, 42, the coil winding core portions 34, 44, the inter-coil core portions 38, 48, the end side collar portions 37a, 37c, 47a, 47c, and the intermediate collar. Regarding the parts 37b and 47b and the collar parts 39 and 49, it is arbitrary to separate them and combine them together.

  In the example shown in FIG. 12, the coil winding core portions 34, 44 and the inter-coil core portions 38, 48, the end side collar portions 37 a, 37 c, 47 a, 47 c, the intermediate collar portions 37 b, 47 b, and the collar portion 39. , 49 and the back yoke magnetic cores 32, 42 are formed separately from each other. According to this configuration, the back yoke magnetic cores 32 and 42 can be easily formed of laminated steel plates in which thin plates such as steel plates are laminated in the direction of the rotation axis 18a. Moreover, each coil winding core part 34 and 44 and each core part 38 and 48 between coils, and the edge part side collar parts 37a, 37c, 47a, 47c, the intermediate collar parts 37b, 47b, and the collar parts 39, 49 are integrated. About a chemical compound, it can form with a powder iron core, for example, an isotropic powder iron core.

  FIG. 13 is a perspective view showing still another modification of the winding stator. As shown in FIG. 13, the end side flange portions 37a, 37c, 47a, 47c, the intermediate flange portions 37b, 47b, and the flange portions 39, 49 are respectively formed by coil winding core portions 34, 44 and inter-coil core portions 38, 48 may be a separate body. This configuration allows the coils 50U, 50V, 50W, 52U, 52V, and 52W to be easily fitted on the coil winding core portions 34 and 44 and the inter-coil core portions 38 and 48, thereby contributing to an improvement in the coil space factor. To do.

  In addition, the clearance gap between the divided coil winding core parts 36a, 36b, 36c, 46a, 46b, 46c in the said coil winding core parts 34 and 44 is between the coil winding core parts 34 and 44 in which a coil is arrange | positioned, and a coil. It may be smaller than the gap between the core portions 38 and 48. Even in this case, it is preferable that the gaps between the end flange portions 37a, 37c, 47a, 47c, the intermediate flange portions 37b, 47b, and the flange portions 39, 49 are of equal width. This is to maintain symmetry on both sides of each of the winding stators 30 and 40 and on each phase.

  The connection configuration of the coils 50U, 50V, 50W and the coils 52U, 52V, 52W will be described.

  First, as shown in FIGS. 1 and 5, one end of the coil winding is drawn from one end in the circumferential direction of each of the coils 50U, 50V, 50W and the coils 52U, 52V, 52W, and the other in the circumferential direction, etc. When the other end of the coil winding is drawn from the end, the coils 50U, 50V, 50W and the coils 52U, 52V, 52W connected between the pair of winding stators 30, 40 are rotated. They are connected via end portions close to each other with a distance projected on a plane substantially orthogonal to the axis 18a as a reference. That is, it is assumed that the coils 50U, 50V, and 50W and the coils 52U, 52V, and 52W have the same drawing end and are attached in the same direction and posture as viewed from the rotor 20. Then, the other end portion of the coil 50U and one end portion of the coil 52U are disposed at relatively close positions with respect to the plane. Therefore, the wiring 60U may be connected between these end portions. Similarly, the other end of the coil 50V and one end of the coil 52V may be connected by a wiring 60V, and the other end of the coil 50W and one end of the coil 52W may be connected by a wiring 60W. In addition, although the cross wiring 60U, 60V, and 60W shown in FIG. 1 are shown by the length according to the exploded perspective view, it is actually shorter.

  Note that one end of each of the coils 50U, 50V, and 50W is connected to the neutral point by the winding stator 30 via the wiring 62. The other ends of the coils 52U, 52V, and 52W are connected to a power source via the wiring 64.

  Thus, productivity can be improved by using the coils 50U, 50V, 50W, 52U, 52V, and 52W of the same structure. In addition, there is also an advantage that the wirings 60U, 60V, 60W for connecting 50U, 50V, 50W, 52U, 52V, 52W in each phase can be shortened.

  In addition, when said N is an integer greater than or equal to 2, ie, when the three-phase coils 50U, 50V, 50W, 52U, 52V, and 52W are provided in each winding stator 30 and 40, a preferable wiring form is mentioned later. To do.

  In addition, as shown in FIG. 11, in each of the winding stators 30 and 40, the coils 50U, 50V, and 50W and the coils 52U, 52V, and 52W are respectively star-connected through the wiring 70, and the respective coils 50U. , 50V, 50W and coils 52U, 52V, 52W may be connected in parallel, and current from an external power source may be supplied to each via a wiring 72.

  In this case, there is an advantage that it is possible to reduce the wiring connecting the coils 50U, 50V, 50W and the coils 52U, 52V, 52W between the pair of winding stators 30, 40. For example, even if it is desired to increase the outer diameter of the rotor 20, the outer diameter of the rotor 20 is limited to be reduced by the wiring between the winding stators 30 and 40. This form can reduce such restrictions. This embodiment is a connection mode suitable for a case where variations in resistance values and the like in the coils 50U, 50V, 50W and the coils 52U, 52V, 52W are small.

  If the winding stators 30 and 40 are driven by supplying current from the same power source, only one inverter circuit or the like need be provided.

{Second Embodiment}
An axial gap type rotating electrical machine according to the second embodiment will be described. FIG. 14 is an exploded perspective view showing the axial gap type rotating electrical machine, and FIG. 15 is a schematic sectional view showing a coil winding core portion and an inter-coil core portion in the rotating electrical machine.

  The axial gap type rotating electrical machine 110 according to the present embodiment is different from the first embodiment in the configuration related to the coil winding core portions 134 and 144. Since other configurations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  In the coil winding core portions 134 and 144, the divided coil winding core portions 36a, 36b, 36c, 46a, 46b, and 46c described in the first embodiment are integrated.

  Further, the end side flange portions 137a, 137c, 147a, 147c provided at the end portions of the respective divided coil winding core portions 36a, 36b, 36c, 46a, 46b, 46c and the intermediate collar portions 137b, 147b are slits. Are separated from each other.

  In addition, as shown in FIG. 16, it is not always necessary to provide a slit between the end side flange portions 137a, 137c, 147a, and 147c and the intermediate flange portions 137b and 147b. The permeance can be reduced by eliminating the slit in this way. However, in order to reduce the cogging torque, it is preferable to provide a slit between the end side flange portions 137a, 137c, 147a, 147c and the intermediate flange portions 137b, 147b.

  In the second embodiment, since the gaps can be omitted in the split coil winding core portions 36a, 36b, 36c, 46a, 46b, 46c, the core space factor can be improved, and they can be handled easily as an integrated object. Can do.

  Hereinafter, modifications of the axial gap type rotating electrical machine according to the second embodiment will be described.

  FIG. 17 shows another modification of the coil winding core part. The outer peripheral side portions of the inter-coil core portions 138B and 148B according to this modification are formed so as to extend further to the outer peripheral side than the outer peripheral portions of the coil winding core portions 134B and 144B. The outer peripheral side extending portions of the inter-coil core portions 138B and 148B are present within a range existing between the coils 50U, 50V and 50W and the coils 52U, 52V and 52W.

  According to this modification, the cross-sectional areas of the coil winding core portions 134B and 144B can be increased by effectively using the gaps between the coils 50U, 50V, and 50W and the coils 52U, 52V, and 52W.

  However, considering the amount of magnetic flux in each phase, the cross-sectional area of the coil winding core portions 134B and 144B is the inter-coil core regardless of the shape of the coil winding core portions 134B and 144B and the inter-coil core portions 138B and 148B. It is preferably approximately three times the cross-sectional area of the portions 138B and 148B. Thereby, the cross-sectional area of the magnetic circuit according to each phase can be made substantially the same, and magnetic flux density unevenness can be prevented and magnetic saturation can be prevented.

  FIG. 18 is an exploded perspective view showing a modified example of the coil winding core portion and the inter-coil core portion, and FIG. 19 is a perspective view in which the axial gap type rotating electric machine is divided into a rotor and two winding stators. FIG. 20 is a side view showing an axial gap type rotating electrical machine according to the modification, and FIG. 21 is a perspective view of the axial gap type rotating electrical machine.

  The coil winding core portions 134C and 144C have a convex shape on the outer side in a plane substantially orthogonal to the rotation shaft 18a. More specifically, it is preferable that the coil winding core portions 134C and 144C have a cross-sectional shape that is convex in an arc shape in the plane, and here, in the outer tangent direction of the back yoke magnetic cores 32 and 42, It has a long oval cross section.

  The coils 150CU, 150CV, 150CW, 152CU, 152CV, and 152CW are wound around the outer peripheral portions of the coil winding core portions 134C and 144C along the convex shape.

  Moreover, the surface which opposes the outer surface of the said coil winding core parts 134C and 144C among the core parts 138C and 148C between coils has a dent shape according to the outer surface shape of the said coil winding core parts 134C and 144C. ing. Thereby, the clearance gap between each coil winding core part 134C, 144C and the core parts 138C, 148C between coils is formed in the groove shape of substantially equal width.

  According to this modification, since the outer peripheral part of the cross-sectional shape of each coil winding core part 134C, 144C has a convex shape outward, the coils 150CU, 150CV, 150CW, 152CU, 152CV, 152CW are connected to each coil winding. The core portions 134C and 144C can be wound tightly around the outer peripheral portion, and the coil space factor can be improved.

  In addition, since the gaps between the coil winding core parts 134C and 144C and the inter-coil core parts 138C and 148C are formed in substantially equal-width grooves, the coils 150CU, 150CV, 150CW, 152CU, 152CV, and 152CW can be densely arranged in a packed manner, and the coil space factor and the core space factor can be improved.

{Third embodiment}
An axial gap type rotating electrical machine according to the third embodiment will be described. FIG. 22 is an exploded perspective view showing the same axial gap type rotating electrical machine, FIG. 23 is a perspective view showing a state in which the same rotating electrical machine is divided into a rotor and two winding stators, and FIG. It is explanatory drawing which shows the arrangement | positioning aspect and connection aspect of a coil in a gap type rotary electric machine. In FIG. 24, for easy understanding, reference numerals TS <b> 1 to TS <b> 24 are assigned to each position where the coil winding core part is divided into three parts and each position of the inter-coil core part.

  The axial gap type rotating electric machine 110 according to the present embodiment is different from the modification shown in FIGS. 18 to 21 of the second embodiment in that each of the winding stators 230 and 240 has three-phase coils 250U, 250V, The difference is that a plurality of sets of 250 W or three-phase coils 252U, 252V, and 252W are provided. Other configurations are the same as the configurations described above, and thus the same reference numerals are given and description thereof is omitted.

  That is, this one winding stator 230 has two sets (that is, N = 2) of three-phase coils 250U, 250V, and 250W. The three-phase coils 250U, 250V, and 250W are arranged around the rotating shaft 18a in that order at intervals. In addition, a coil winding core portion 234 around which these three-phase coils 250U, 250V, and 250W are wound and an inter-coil core portion 238 between them are also formed with a short size around the rotating shaft 18a. ing.

  Similarly, the other winding stator 240 has two sets of three-phase coils 252U, 252V, and 252W (that is, N = 2), and a coil winding core portion 244 around which these sets are wound and It has a core part 248 between the coils.

  In addition, both the winding stators 230 and 240 are substantially orthogonal to the rotation shaft 18a, have a mirror surface shape with respect to the plane between the both winding stators 230 and 240, and are further centered on the rotation shaft 18a. (180 / N) °, that is, a symmetry rotated by 90 °.

  Further, the rotor 220 alternately presents (4 × N) poles, that is, eight magnetic poles, on both surfaces thereof.

  According to the axial gap type rotating electrical machine 210 according to the present embodiment, in each of the winding stators 230 and 240, the coils 250U, 250V, 250W, 252U, 252V, and 252W having the same phase are present at 180 ° target positions. For this reason, magnetic force can be made to act with sufficient balance in the outer periphery of the rotor 20, and the inclination of the rotor 20 can be suppressed effectively. Thereby, vibration and sound can be reduced.

  Incidentally, in the case of N = 3, there is a coil having the same phase at the target position of 120 °, so that the magnetic force can be applied in a balanced manner around the outer periphery of the rotor. That is, if N is 2 or more, the above effect can be expected.

  When N is an integer greater than or equal to 2, 250 U, 250 V, 250 W, 252 U, 252 V, and 252 W connected in series in the same phase are provided in both winding stators 230 and 240, and these are both By connecting the winding stators 230 and 240 to each other, the wiring between the coils can be shortened.

  This will be specifically described with reference to FIG.

  As a comparative example, two U-phase coils 250U are connected in series with one winding stator 230, and two U-phase coils 252U are connected in series with the other winding stator. Consider the case of connection use. In this case, a wiring for half a back yoke magnetic core 32 is required between the two coils 250U, and a wiring for a half circumference of the back yoke magnetic core 42 is required between the two coils 252U. Minute wiring is required. In other words, wiring for a total of 1 and 1/4 turn is required.

  On the other hand, in the above connection mode, as shown by a two-dot chain line in FIG. 24, a wiring 260 for a quarter turn is required between the coil 250U and the coil 252U, and this is required for three connection points. That is, wiring for a total of 3/4 turns is required. Note that a wiring 262 indicates a wiring for connection to an external or neutral point.

  Therefore, when N is an integer greater than or equal to 2, 250 U, 250 V, 250 W, 252 U, 252 V, and 252 W connected in series in the same phase are provided in both winding stators 230 and 240, and these are both By connecting the winding stators 230 and 240 alternately in the circumferential direction, the wiring between the coils can be shortened.

{Modifications}
The axial gap type rotating electrical machine described above can be used as a motor or a generator.

  Moreover, the structure which concerns on said each embodiment and each modification can be suitably combined mutually, unless it opposes mutually.

It is a disassembled perspective view which shows the axial gap type rotary electric machine which concerns on 1st Embodiment. It is a side view which shows the same axial gap type rotary electric machine. It is a partial exploded perspective view of a rotor. It is a perspective view which shows a rotor. It is explanatory drawing which shows the state by which the three-phase alternating current was supplied with the axial gap type rotary electric machine, and the connection aspect. It is a figure which shows the relationship between the coil | winding form of a coil and generated magnetic flux in an axial gap type rotary electric machine. It is a perspective view which shows the modification of a rotor. It is a perspective view which shows the other modification of a rotor. It is a disassembled perspective view which shows the rotor which concerns on the other modification same as the above. It is a perspective view which shows the other modification of a rotor. It is a disassembled perspective view which shows the modification of a winding stator. It is a disassembled perspective view which shows the other modification of a coil | winding stator. It is a disassembled perspective view which shows the other modification of a coil | winding stator. It is a disassembled perspective view which shows the axial gap type rotary electric machine which concerns on 2nd Embodiment. It is a schematic sectional drawing which shows the coil winding core part and the core part between coils in a rotary electric machine same as the above. It is a schematic sectional drawing which shows the modification of a coil winding core part. It is a disassembled perspective view which shows the other modification concerning a coil winding core part. It is a disassembled perspective view which shows the further another modification which concerns on a coil winding core part and a core part between coils. It is a perspective view which shows the state which divided | segmented the axial gap type rotary electric machine into the rotor and the two winding stators regarding the modification same as the above. It is a side view which shows the axial gap type rotary electric machine which concerns on the modification same as the above. It is a perspective view of the axial gap type rotary electric machine which concerns on the modification same as the above. It is a disassembled perspective view which shows the axial gap type rotary electric machine which concerns on 3rd Embodiment. It is a perspective view which shows the state which divided | segmented the axial gap type rotary electric machine same as the above into the rotor and the two coil | winding stators. It is explanatory drawing which shows the arrangement | positioning aspect and connection aspect of a coil in an axial gap type rotary electric machine same as the above.

Explanation of symbols

10, 110, 210 Axial gap type rotating electrical machine 18a Rotating shaft 20, 20B, 20C, 20D, 220 Rotor 22, 22D Permanent magnet 23D Intervening magnetic core 26, 26C Rotor magnetic core 26Ca, 26Cb Wide part 26Cc Connecting part 30, 40, 30E, 40E, 30F, 40F, 230, 240 Winding stator 32, 42 Back yoke magnetic core 34, 44, 134, 144, 134B, 144B, 134C, 144C, 234, 244 Coil winding core portions 36a, 36b, 36c , 46a, 46b, 46c Split coil winding core portions 37a, 37c, 47a, 47c, 137a, 137c, 147a, 147c End side flange portions 37b, 47b, 137b, 147b Intermediate flange portions 38, 48, 138B, 148B, 138C, 148C, 238, 248 Inter-core core part 39Fa, 49Fa Connection part 50U, 50V, 50W, 52U, 52V, 52W, 150CU, 150CV, 150CW, 152CU, 152CV, 152CW, 250U, 250V, 250W, 252U, 252V, 252W Coil 60U, 60V, 60W Wiring 260 Wiring

Claims (18)

A rotor (20, 20B, 20C, 20D, 220) that is rotatably arranged around the rotation axis (18a) and presents a plurality of poles around the rotation axis;
A pair of winding stators (30, 40, 30E, 40E, 30F, 40F, 230, 240) disposed with a gap on both sides of the rotor in the direction of the rotation axis;
With
A plurality of coils (50U, 50V, 50W, 52U, 52V, 52W, 150CU, 150CV, 150CW, 152CU, 152CV, 152CW, 250U, 250V, 250W, 252U, 252V, 252W) are provided on the pair of winding stators. Distributed winding over an even number of layers along the rotation axis direction,
The coils are separated into two groups along the direction of the rotation axis, provided on the winding stators, and coils of the same phase are wound at the same position in the circumferential direction over the two groups. Axial gap type rotating electrical machine that is not. A rotor (20, 20B, 20C, 20D, 220) that is arranged so as to be rotatable about a rotation axis (18a) and presents magnetic poles of (4 × N) poles (N is a positive integer) around the rotation axis. When,
A gap is provided on both sides of the rotor in the direction of the rotation axis, with a gap therebetween, and a substantially disk-shaped back yoke magnetic core (32, 42), along the rotation axis on the rotor side of the back yoke magnetic core. And three sets of three-phase coils (50U, 50V, 50W, 52U, 52V, 52W, 150CU, 150CV, 150CW, 152CU, 152CV, 152CW, 250U, 250V) , 250 W, 252 U, 252 V, 252 W), respectively,
With
Each of the winding stators has (3 × N) coil winding core portions (34, 44, 134) around which the N sets of three-phase coils are wound as the plurality of winding stator core portions. , 144, 134B, 144B, 134C, 144C, 234, 244) and (3 × N) inter-coil core portions (38, 48, 138B, 148B, 138C) provided between the coil winding core portions. , 148C, 238, 248),
A coil winding core portion provided on one of the winding stators and having both ends (36a, 36c, 46a, 46c) in the circumferential direction of the coil wound with a predetermined phase wound on the other winding The two coil winding core portions provided on the stator are opposed to the circumferential end portions (36a, 36c, 46a, 46c) of the other two-phase coils wound, and
A coil winding core portion provided in one of the winding stators, and a substantially intermediate portion (36b, 46b) in the circumferential direction of the coil having a predetermined phase wound thereon is connected to the other winding stator. The inter-coil core portion provided between the coil winding core portions around which the other two-phase coils are wound (38, 48, 138B, 148B, 138C, 148C, 238, 248), an axial gap type rotating electrical machine. An axial gap type rotating electrical machine according to claim 2,
An axial gap type rotating electrical machine in which the rotor has a plurality of magnetic poles represented by permanent magnets (22, 22D), and each magnetic pole is substantially magnetically independent. An axial gap type rotating electrical machine according to claim 2 or claim 3, wherein
The rotor is an axial gap type rotating electrical machine having permanent magnets (22, 22D) presenting magnetic poles with respect to the both winding stators. An axial gap type rotating electrical machine according to claim 3 or claim 4,
The said permanent magnet (22) is an axial gap type rotary electric machine which has the anisotropy which has an easy axis of magnetization along the said rotating shaft direction. An axial gap type rotating electrical machine according to any one of claims 2 to 5,
A coil winding core portion provided on one of the winding stators and having a coil of a predetermined phase wound on the tip thereof,
Two coil winding core portions provided on the other winding stator and the end side collar portion (37a, opposite to the circumferential end portion of the other two phases of the coil wound) 37c, 47a, 47c, 137a, 137c, 147a, 147c),
An intermediate brim portion that is opposed to the core portion between the coils provided on the other winding stator and that exists between the coil winding core portions around which the coils of the other two phases are wound. 37b, 47b, 137b, 147b),
Is provided,
An axial gap type rotating electrical machine in which the end side collar portion and the intermediate collar portion are magnetically independent. An axial gap type rotating electrical machine according to claim 6,
An axial gap type rotating electrical machine in which each flange provided at the tip of one coil winding core is connected and integrated by connecting portions (39Fa, 49Fa). An axial gap type rotating electrical machine according to any one of claims 2 to 7,
An axial gap type rotation in which the cross-sectional area of the coil winding core part (134B, 144B) is substantially three times the cross-sectional area of the inter-coil core part (138B, 148B) in a plane substantially orthogonal to the rotation axis. Electric. An axial gap type rotating electrical machine according to any one of claims 2 to 8,
An axial gap type rotating electrical machine in which an outer peripheral portion of a cross-sectional shape of the coil winding core portion (134C, 144C) has a convex shape on the outside in a plane substantially orthogonal to the rotation axis. An axial gap type rotating electrical machine according to any one of claims 2 to 9,
An axial gap type rotating electrical machine in which a gap between the coil winding core part (134C, 144C) and the adjacent inter-coil core part (138C, 148C) is formed in a substantially uniform groove shape. An axial gap type rotating electrical machine according to any one of claims 2 to 10,
The inter-coil core portions (138B, 148B) are on the outer peripheral side of the respective coil winding core portions (134B, 144B), except between the coil winding core portions and the portions where the coils are disposed. An axial gap type rotating electrical machine provided in the gap. It is an axial gap type rotary electric machine in any one of Claims 2-11,
The axial gap type rotating electrical machine, wherein N is an integer of 2 or more. An axial gap type rotating electrical machine according to any one of claims 2 to 12,
The one winding stator (30, 40, 30E, 40E, 30F, 40F, 230, 240) includes at least the positions and shapes of the coil winding core portion and the inter-coil core portion, the phase sequence of the coils, With respect to the number of turns, the other winding stator (30, 40, 30E, 40E, 30F, 40F, 230, 240) is mirrored with reference to the plane between the two winding stators substantially orthogonal to the rotation axis. An axial gap type rotating electrical machine having a symmetrical shape that has a target shape and is further rotated by (180 / N) ° about the rotation axis. An axial gap type rotating electrical machine according to any one of claims 2 to 13,
Each gap length between the pair of winding stators (30, 40, 30E, 40E, 30F, 40F, 230, 240) and the rotor (20, 20B, 20C, 20D, 220) is substantially the same. An axial gap type rotating electrical machine. An axial gap type rotating electrical machine according to any one of claims 2 to 14,
N is an integer of 2 or more,
A plurality of the coils connected in series in the same phase are provided in the two-winding stator, and the plurality of coils are connected (260) so as to connect the pair of winding stators. Axial gap type rotating electrical machine. An axial gap type rotating electrical machine according to any one of claims 2 to 15,
Each coil of the pair of winding stators is such that one end of the coil winding is drawn from one end in the circumferential direction and the other end of the coil winding is drawn from the other end in the circumferential direction. Yes,
The coils connected in series between the pair of winding stators are connected via end portions close to each other on the basis of a distance projected on a plane substantially orthogonal to the rotation axis (60U, 60V, 60W, 260). Axial gap type rotating electrical machine. An axial gap type rotating electrical machine according to any one of claims 2 to 14,
An axial gap type rotating electrical machine in which each coil is star-connected (70) in each of the windings fixed. An axial gap type rotating electrical machine according to any one of claims 2 to 17,
The rotor has a plurality of permanent magnets arranged at intervals around the rotation axis,
An axial gap type rotating electrical machine in which an intervening magnetic core (23D) is interposed between the permanent magnets, which is magnetically independent from the permanent magnets.

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