Stator

Abstract

A stator (30) is provided with a stator core (31) having a rear yoke (33) and a plurality of teeth (34), and a stator winding (32) having a plurality of phase windings provided for each phase. Each phase winding has a plurality of partial windings wound around the teeth by concentrated winding. Among a first tooth, a second tooth, and a third tooth, which are continuous in the circumferential direction, among the plurality of teeth, a partial winding of the first phase winding (C1) is continuously wound around the first tooth and the second tooth, and a partial winding of the second phase winding (C2) is continuously wound around the second tooth and the third tooth. One end of the first phase winding is drawn out from the base end side or the top end side of the first tooth, the other end is drawn out from the base end side or the top end side of the second tooth, on the other hand, one end of the second phase winding is drawn out from the base end side or the top end side of the third tooth, and the other end is drawn out from the base end side or the top end side of the second tooth.

Description

[0001] Cross-references of related applications

[0002] This application is based on Japanese application No. 2022-147354 filed on September 15, 2022, and the contents thereof are cited herein. Technical Field

[0003] The invention relates to a stator. Background Art

[0004] In a rotating electric machine having a stator and a rotor, in order to achieve the reduction of pulsating current in a stator winding provided in the stator, it is conceivable to wind two phase windings of mutually different phases in each of three consecutive teeth in the circumferential direction. For example, Patent Document 1 describes the following technology: In a rotating electric machine having a three-phase stator winding consisting of a U phase, a V phase, and a W phase, the first tooth is wound with each coil body Ua, Va, Wa of the U phase, V phase, and W phase in the first stator winding, the second tooth is wound with each coil body Ub, Vb, Wb of the U phase, V phase, and W phase in the second stator winding, and the third tooth is wound with each coil body Uc, Vc, and Wc of one phase in the first stator winding and the second stator winding, the phase difference of the magnetomotive force in each coil body between the phases is within a prescribed phase range including an electrical angle of 20 degrees.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 7103299

[0008] However, Patent Document 1 and the like do not describe a specific structure in which a two-phase phase winding is wound around each of three consecutive teeth in the circumferential direction. Therefore, it is desirable to propose a technology in which a two-phase phase winding is wound around each of three consecutive teeth in the circumferential direction. Summary of the invention

[0009] The present invention has been made in view of the above-mentioned technical problems, and an object of the present invention is to provide a stator in which two-phase phase windings can be appropriately wound around three teeth that are continuous in the circumferential direction.

[0010] Hereinafter, technical means for solving the above-mentioned technical problems and their effects will be described.

[0011] Technical means 1 is a stator having:

[0012] a stator core including a back yoke in an annular shape and a plurality of teeth extending radially from the back yoke and arranged at predetermined intervals in a circumferential direction; and

[0013] a stator winding having a plurality of phase windings provided for each phase,

[0014] Each of the phase windings has a plurality of partial windings, and the plurality of partial windings are respectively wound around the teeth by concentrated winding.

[0015] Among the plurality of teeth, in three circumferentially consecutive first teeth, second teeth, and third teeth, a portion of a first phase winding among the plurality of phase windings is continuously wound around the first tooth and the second tooth, and a portion of a second phase winding among the plurality of phase windings is continuously wound around the second tooth and the third tooth,

[0016] One end of the first phase winding is drawn out from the base end side or the tip end side of the first tooth, and the other end is drawn out from the base end side or the tip end side of the second tooth.

[0017] On the other hand, one end of the second phase winding is drawn out from the base end side or the tip end side of the third tooth, and the other end is drawn out from the base end side or the tip end side of the second tooth.

[0018] For example, in order to achieve the reduction of pulsating current in the stator, it is considered that two phase windings (first phase winding and second phase winding) with different phases are wound in each of three teeth in a circumferential direction. Specifically, in the stator core, it is considered that in the three teeth in a circumferential direction, a part of the winding of the first phase winding is wound continuously on the first tooth and the second tooth, and a part of the winding of the second phase winding is wound continuously on the second tooth and the third tooth. In addition, in this structure, one end of the first phase winding is pulled out from the base end side or the top end side of the first tooth, and the other end is pulled out from the base end side or the top end side of the second tooth. On the other hand, one end of the second phase winding is pulled out from the base end side or the top end side of the third tooth, and the other end is pulled out from the base end side or the top end side of the second tooth. In this way, three teeth can be regarded as a group, and the connection of the wire end in each phase winding to the power supply side and the connection of the neutral point can be appropriately implemented. As a result, the phase windings of two phases can be appropriately wound in each of the three teeth in a circumferential direction.

[0019] In technical means 2, the second phase winding of the first phase winding and the second phase winding is the leading winding group that is wound first when the winding is wound, and the first phase winding is the trailing winding group that is wound later. An inter-tooth guide portion is provided at the axial end of the stator core and radially outward or inner side compared with the teeth. The inter-tooth guide portion guides a transition portion that is arranged between the second tooth and the third tooth in the leading winding group.

[0020] When the second tooth in the middle of three teeth in a row from the first to the third in the circumferential direction is used as a common tooth and two phase windings (the first phase winding and the second phase winding) are respectively wound on the common tooth, there is a concern that the transition portion between teeth in the first winding group may become an obstacle when the second winding group is wound on the second tooth. In this regard, since an inter-tooth guide portion for guiding the transition portion of the first winding group is provided at the axial end of the stator core and radially outside or inside the teeth, it is possible to prevent the transition portion between teeth in the first winding group from becoming an obstacle when the second winding group is wound.

[0021] In technical means 3, an insulating component is provided at the axial end of the stator core, which insulates the teeth from the partial winding. The insulating component has a rising portion on at least one of the base end side and the top end side of the tooth, and the rising portion is arranged in a manner extending in the axial direction. The rising portion functions as the inter-tooth guide portion, and the transition portion is arranged on the side of the rising portion opposite to the tooth.

[0022] The transition portion between teeth in the pre-wound winding is guided by an insulating member provided at the axial end of the stator core to insulate the teeth from the partial winding. According to the insulating member, the transition portion between teeth can be appropriately guided while insulating the teeth from the partial winding.

[0023] In technical means 4, in the pre-winding group, one side and the other side of the transition portion guided by the inter-tooth guide portion are respectively a partial winding wound on the second tooth and a partial winding wound on the third tooth, and the winding directions of the wire materials of these partial windings are opposite to each other.

[0024] In the case where the winding directions of the wires of the partial windings wound on the second and third teeth are opposite to each other in the first winding group, it is considered that the wire material in the transition part is more likely to loosen than when the winding directions are the same. In addition, if the wire material in the transition part of the first winding is loosened, there is a concern that it will affect the subsequent winding group. In this regard, since the transition part of the first winding group is guided to the inter-tooth guide part, the looseness of the transition part can be suppressed, and each phase winding can be appropriately wound.

[0025] In technical means 5, an insulating component is provided at the axial end of the stator core, which insulates the tooth from the partial winding. The insulating component has a retaining portion, which is provided on the base end side or the top end side of the tooth and retains the wire end portion, which is the side where the winding of each wire in the first phase winding and the second phase winding starts and ends.

[0026] The ends of the wires of the first phase winding and the second phase winding, which are the winding start side and the winding end side, are held by a holding portion provided on the base end side or the tip end side of the tooth in the insulating member. Thus, the position of the ends of the wires of each phase winding can be appropriately determined, thereby facilitating connection to a bus bar or the like. In addition, it is expected that the loosening of the wires can be suppressed during the winding operation of each phase winding.

[0027] In technical means 6, the stator core is composed of a plurality of split cores that can be split in the circumferential direction and each of which has the teeth, and the holding portion is provided on each of the split cores.

[0028] The stator core is formed of a plurality of split cores, and each split core is provided with a holding portion for holding the wire end of each phase winding. In this case, the wire end drawn out from the partial winding can be appropriately held in each structure wound around each tooth of each split core.

[0029] In technical means 7, when the number of turns of the partial winding for the first tooth and the third tooth is Na, and the number of turns of the partial winding for the second tooth is Nb, the relationship between these numbers of turns is Na / 2<Nb.

[0030] The number of turns of the partial winding of the teeth at both ends (the first tooth and the third tooth) of each of the three teeth in a circumferential direction is Na, and the number of turns of the partial winding of the central tooth (the second tooth) is Nb. When the relationship between these numbers of turns is Na / 2<Nb, the amount of wire in the central tooth, that is, the common tooth, is increased compared with the other teeth. Therefore, when the wire is wound around the common tooth, there is a concern that the winding may be disordered. In this regard, by specifying the extraction position of the wire end of each phase winding, it is possible to suppress the inconvenience caused by the winding of the wire disorder.

[0031] In addition, by guiding the transition portion of the phase winding to the inter-tooth guide portion or holding the end of the conductor wire by the holding portion, it is also possible to achieve an effect of suppressing the inconvenience caused by the winding of the conductor wire.

[0032] In technical means 8, there is a bus module, which has a bus and a bus frame. The bus is electrically connected to the wire ends of each phase winding. The bus frame holds the bus, and the wire ends at one end and the other end of each phase winding are pulled out in an axially extending manner and inserted into the insertion holes provided on the bus frame to be connected to the bus.

[0033] In each phase winding wound around three consecutive first to third teeth in the circumferential direction, the wire end is drawn out from the base end side or the tip end side of each tooth, in other words, the wire end is drawn out from a predetermined position relative to each tooth. In this case, the wire end of each phase winding can be easily and appropriately connected to the busbar module provided on one side of the axial end of the stator core.

[0034] In technical means 9, the stator core has 3×n teeth, and the teeth in groups of three in the circumferential direction are respectively tooth groups. The bus module is in the shape of a circular ring coaxial with the stator core, and two phase windings equivalent to the first phase winding and the second phase winding are wound on each of the tooth groups. The bus module is assembled on one axial end side of the stator core.

[0035] According to the above configuration, the stator winding can be appropriately wound around all 3×n teeth in the stator core, and the bus bar module can be easily and appropriately assembled to the n teeth groups. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above-mentioned object and other objects, features and advantages of the present invention will become more apparent through the following detailed description with reference to the accompanying drawings. In the accompanying drawings:

[0037] Figure 1 It is a longitudinal section view of the motor.

[0038] Figure 2 It is a cross-sectional view of the motor.

[0039] Figure 3 It is a diagram showing the electrical structure of the control device.

[0040] Figure 4 It is a three-dimensional diagram of the stator.

[0041] Figure 5 It is a top view of the stator.

[0042] Figure 6 It is a perspective view showing the structure of a stator core.

[0043] Figure 7 It is the winding structure diagram of the stator winding.

[0044] Figure 8 This is a diagram showing the correspondence between each part of the stator winding and the teeth.

[0045] Fig. 9 It is a figure which shows the structure of a split core.

[0046] Fig.10 This is a perspective view showing a state where a partial winding is wound around one tooth group.

[0047] Fig.11 It is a three-dimensional diagram of a bus module.

[0048] Fig.12 It is a perspective view showing the structure of a bus bar.

[0049] Fig.13 It is a perspective view showing the structure of a busbar rack.

[0050] Fig.14 This is a perspective view showing a state where the bus bar module is mounted on the stator.

[0051] Fig.15 It is a perspective view showing a state where a partial winding is wound around a tooth group in the second embodiment.

[0052] Fig.16 This is a top view of the gear set viewed from the axial direction.

[0053] Fig.17 is a winding structure diagram of a stator winding in another example. DETAILED DESCRIPTION

[0054] (First Embodiment)

[0055] Hereinafter, each embodiment will be described based on the drawings. In addition, in each of the following embodiments, the same or equivalent parts are marked with the same symbols in the drawings, and the description of the parts with the same symbols is cited. In the first embodiment, the motor 10 as a rotating electrical machine is described as an example.

[0056] Figure 1 The motor 10 shown is a permanent magnet excitation type motor, specifically, a permanent magnet excitation type synchronous machine having a three-phase winding. That is, the motor 10 is a brushless motor. The three-phase winding may have two systems. The motor 10 includes: a housing 20, a stator 30 fixed to the housing 20, a rotor 40 that rotates relative to the stator 30, and a rotating shaft 11 to which the rotor 40 is fixed. Hereinafter, in this embodiment, the axial direction indicates the axial direction of the rotating shaft 11, the radial direction indicates the radial direction of the rotating shaft 11, and the circumferential direction indicates the circumferential direction of the rotating shaft 11.

[0057] The housing 20 is formed in a cylindrical shape, and the stator 30 and the rotor 40 are housed in the housing 20. The housing 20 is provided with bearings 23 and 24, and the rotating shaft 11 is supported rotatably by the bearings 23 and 24. The axis of the inner peripheral surface of the housing 20 is coaxial with the rotating shaft 11. An angle sensor 12 is provided on the top end side of the rotating shaft 11. The angle sensor 12 can be a magnetic sensor or a rotary transformer.

[0058] The stator 30 is provided in a cylindrical shape along the inner circumference of the housing 20 at the substantially axial center of the housing 20. The stator 30 is fixed to the inner circumferential surface of the housing 20 with the axis O of the rotating shaft 11 as the center. The stator 30 constitutes a part of the magnetic circuit, and includes: a stator core 31 which is annular and arranged radially opposite to the outer circumference of the rotor 40, and a stator winding 32 wound on the stator core 31.

[0059] like Figure 2 As shown, the stator core 31 has: an annular back yoke 33, and a plurality of teeth 34 protruding from the back yoke 33 toward the radial inside and arranged at a predetermined distance in the circumferential direction, and a slit 35 is formed between adjacent teeth 34. In the stator core 31, the teeth 34 are arranged at equal intervals in the circumferential direction, and the stator winding 32 is wound around the teeth 34. Thus, the conductor of the stator winding 32 is accommodated in each slit 35. In the present embodiment, the number of teeth 34 and the number of slits 35 are "18" respectively. For the convenience of explanation, the symbols T1 to 18 are marked counterclockwise on each tooth 34 in the order of arrangement in the circumferential direction. When it is necessary to indicate the tooth number, the tooth 34 is recorded as teeth T1, T2, T3... The stator winding 32 is maintained in a state of being accommodated in the slit 35, and a magnetic flux is generated by being supplied with power (AC power).

[0060] The stator core 31 is formed by laminating a plurality of thin plate-shaped magnetic steel plates (core materials) in the axial direction of the stator core 31. The steel plates can be formed by, for example, punching a strip-shaped electromagnetic steel plate material.

[0061] The rotor 40 constitutes a part of the magnetic circuit, has a plurality of magnetic poles in the circumferential direction, and is arranged to face the stator 30 in the radial direction. In the present embodiment, the rotor 40 has 14 magnetic poles (i.e., the number of magnetic pole pairs is 7). The rotor 40 includes a rotor core 41 made of a magnetic body and a permanent magnet 42 fixed to the rotor core 41. Specifically, as Figure 2 As shown, the rotor 40 includes 14 permanent magnets 42 as magnet portions so that polarities thereof alternate in the circumferential direction. The permanent magnets 42 are embedded in accommodation holes provided in the rotor core 41 along the axial direction.

[0062] The rotor 40 may be a known structure, for example, an IPM (Interior Permanent Magnet) rotor or an SPM (Surface Permanent Magnet) rotor. In addition, as the rotor 40, a rotor on the field winding side may be used. In the present embodiment, an IPM-type rotor is used. The rotating shaft 11 is inserted through the rotor 40, and the rotor 40 is fixed to the rotating shaft 11 in such a manner that the rotor 40 rotates integrally with the rotating shaft 11 with the rotating shaft 11 as the center.

[0063] The motor 10 is connected to a control device 50. The control device 50 is mainly composed of a microcomputer having a CPU, a ROM, a RAM, and an I / O, and the CPU implements various functions by executing programs stored in the ROM. In addition, various functions may be implemented by electronic circuits as hardware, or at least a part of them may be implemented by software, that is, processing executed on a computer.

[0064] The control device 50 has functions such as converting power from the outside (e.g., a battery) and supplying it to the motor 10 to generate driving force. In addition, the control device 50 has functions such as controlling the motor 10 (current control, etc.) using information related to the rotation angle input from the angle sensor 12.

[0065] Figure 3 2 is a diagram showing an electrical configuration of the control device 50 in the present embodiment.

[0066] In the present embodiment, the stator winding 32 is composed of a first stator winding 32a and a second stator winding 32b, and the control device 50 is provided with a first inverter circuit 51 and a second inverter circuit 52 for each stator winding 32a, 32b. Each inverter circuit 51, 52 is composed of a full-bridge circuit having the same number of upper and lower arms as the number of phases of the three phases. The control device 50 controls the current in each phase by turning on and off the switching element provided in each arm.

[0067] To explain in detail, in the three phases consisting of the U phase, the V phase and the W phase, the first inverter circuit 51 is respectively provided with a series connection of an upper arm switch Sp and a lower arm switch Sn as a switching element. In the present embodiment, as the upper arm switch Sp and the lower arm switch Sn in each phase, a voltage-controlled semiconductor switching element is used, specifically, an IGBT is used. In addition, a MOSFET may also be used. The upper arm switch Sp and the lower arm switch Sn in each phase are respectively connected in anti-parallel with flywheel diodes (freewheeling diodes) Dp and Dn.

[0068] The high potential side terminal (collector) of the upper arm switch Sp of each phase is connected to the positive terminal of the battery. In addition, the low potential side terminal (emitter) of the lower arm switch Sn of each phase is connected to the negative terminal (ground) of the battery. The intermediate connection point between the upper arm switch Sp and the lower arm switch Sn of each phase is respectively connected to one end of the phase winding of each phase in the first stator winding 32a. The first stator winding 32a has phase windings of U phase, V phase, and W phase. In the first inverter circuit 51, one end of the phase winding of each phase is respectively connected to the intermediate connection point of the switches Sp and Sn of the upper and lower arms.

[0069] The second inverter circuit 52 has the same structure as the first inverter circuit 51, so detailed description is omitted here. The second stator winding 32b has phase windings of X phase, Y phase, and Z phase. In the second inverter circuit 52, one end of the phase winding of each phase is connected to the intermediate connection point of the switches Sp and Sn of the upper and lower arms, respectively.

[0070] The three-phase current supplied from the first inverter circuit 51 and the three-phase current supplied from the second inverter circuit 52 have a predetermined current phase difference from each other.

[0071] Hereinafter, the structure of the stator 30 will be described in detail. Figure 4 is a three-dimensional diagram of the stator 30, Figure 5 is a top view of the stator 30. In addition, Figure 6 3 is a perspective view showing the structure of the stator core 31. Figure 4 , Figure 5 The stator 30 shown corresponds to Figure 2 The stator 30 is shown.

[0072] In the stator 30, the stator core 31 is composed of a plurality of split cores 61, and the split cores 61 are arranged in a circumferential direction so that the stator core 31 is formed into a cylindrical shape. Each split core 61 has a tooth 34 (see Fig. 9 (a)), each split core 61 is arranged in the circumferential direction, so that Figure 2 As shown, the teeth 34 and the slits 35 are alternately arranged in the circumferential direction. In the present embodiment, the stator core 31 is formed by 18 split cores 61. The stator winding 32 is formed by winding a conductive wire around each tooth 34 by concentrated winding.

[0073] Figure 7 is a winding structure diagram of the stator winding 32 in this embodiment, Figure 7 (a) shows the structure of the phase windings of the U phase, the V phase, and the W phase in the first stator winding 32a. Figure 7 (b) shows the structure of the phase windings of the X phase, the Y phase, and the Z phase in the second stator winding 32b. In each of these stator windings 32a and 32b, the phase windings of each phase are connected to each other by a star connection (Y connection).

[0074] like Figure 7As shown in (a), the first stator winding 32a has partial windings U1, U2, U3, and U4 as phase windings of the U phase, partial windings V1, V2, V3, and V4 as phase windings of the V phase, and partial windings W1, W2, W3, and W4 as phase windings of the W phase. Furthermore, one end of the series connection body of the partial windings U1 and U2, one end of the series connection body of the partial windings V1 and V2, and one end of the series connection body of the partial windings W1 and W2 are connected to each other at a neutral point N1a, and one end of the series connection body of the partial windings U3 and U4, one end of the series connection body of the partial windings V3 and V4, and one end of the series connection body of the partial windings W3 and W4 are connected to each other at a neutral point N1b.

[0075] In addition, if Figure 7 As shown in (b), the second stator winding 32b has partial windings X1, X2, X3, and X4 as phase windings of the X phase, partial windings Y1, Y2, Y3, and Y4 as phase windings of the Y phase, and partial windings Z1, Z2, Z3, and Z4 as phase windings of the Z phase. Furthermore, one end of the series connection body of the partial windings X1 and X2, one end of the series connection body of the partial windings Y1 and Y2, and one end of the series connection body of the partial windings Z1 and Z2 are connected to each other at a neutral point N2a, and one end of the series connection body of the partial windings X3 and X4, one end of the series connection body of the partial windings Y3 and Y4, and one end of the series connection body of the partial windings Z3 and Z4 are connected to each other at a neutral point N2b.

[0076] In addition, in addition to the structure in which the four partial windings of each phase winding in each stator winding 32a, 32b are divided into two and connected in star shape as described above, the four partial windings of each phase winding may be connected in star shape after being connected in parallel in pairs. In this case, in the first stator winding 32a, the neutral points (N1a, N1b) are combined into one, and in the second stator winding 32b, the neutral points (N2a, N2b) are also combined into one.

[0077] The partial windings U1 to U4, V1 to V4, W1 to W4 of each phase in the first stator winding 32a and the partial windings X1 to X4, Y1 to Y4, Z1 to Z4 of each phase in the second stator winding 32b are respectively wound around the teeth 34 of the stator core 31 by concentrated winding. In the present embodiment, the 12 partial windings of the first stator winding 32a and the 12 partial windings of the second stator winding 32b are distributed and wound around the 18 teeth 34 of the stator core 31. This will be described in detail below.

[0078] In the stator core 31, all 18 teeth 34 are divided into three tooth groups, and each of the three teeth 34 in each tooth group is wound with partial windings of two phase windings that are out of phase with each other. Figure 5 As shown, in the stator 30, all teeth 34 (T1 to T18) of the stator core 31 are divided into six tooth groups G1 to G6, and two partial windings of the partial windings U1 to U4, V1 to V4, and W1 to W4 of the first stator winding 32a and two partial windings of the partial windings X1 to X4, Y1 to Y4, and Z1 to Z4 of the second stator winding 32b are wound in a state of being allocated to each tooth group G1 to G6. In this case, in each tooth group G1 to G6, a partial winding of the first stator winding 32a is wound around one of the teeth 34 on both sides in the circumferential direction, and a partial winding of the second stator winding 32b is wound around the other of the teeth 34. In addition, partial windings of both the first stator winding 32a and the second stator winding 32b are wound around the central tooth 34 of each tooth group G1 to G6.

[0079] Here, in each tooth group G1 to G6, three teeth 34 that are continuous in the circumferential direction are set as the first tooth, the second tooth, and the third tooth in the order of arrangement in the circumferential direction, and the first tooth and the second tooth among these first to third teeth are continuously wound with a partial winding of the first phase winding among multiple phase windings, and the second tooth and the third tooth are continuously wound with a partial winding of the second phase winding among multiple phase windings. The second tooth in the middle of the three continuous teeth 34 is a common tooth wound together with the first phase winding and the second phase winding. In this case, the "first phase winding" is any one of the six phase windings of the first stator winding 32a and the second stator winding 32b, and the "second phase winding" is a phase winding different from the first phase winding among the same six phase windings.

[0080] Figure 8 : is a diagram showing the correspondence between each partial winding of the stator windings 32a, 32b and each tooth T1 to T18. Figure 8 For example, in gear group G1,

[0081] A partial winding W1 of the second stator winding 32b is wound around the tooth T1 serving as the first tooth.

[0082] The partial winding W2 of the second stator winding 32b and the partial winding X2 of the first stator winding 32a are wound around the tooth T2 serving as the second tooth.

[0083] The partial winding X1 of the first stator winding 32a is wound around the third tooth T3. Although the other tooth groups G2 to G6 are not described, the partial windings are wound in the same manner, and the first to third teeth of each tooth group G2 to G6 are wound with the partial windings as shown in the figure.

[0084] The winding structure of each partial winding in each tooth group will be described below. In addition, before describing the winding structure of each partial winding, a more detailed structure related to the stator core 31 will be described first.

[0085] Fig. 9 (a) is a three-dimensional view of the split core 61, Fig. 9 (b) is an exploded perspective view of the split core 61. The split core 61 has a core body 62 as a steel plate laminate and insulating components 63 and 64 provided at one axial end and the other axial end of the core body 62 (the upper and lower sides of the figure). The core body 62 has teeth 34 extending in the radial direction (the radial direction in the stator core 31), a yoke portion 62a provided at one end of the core body 62, and a flange portion 62b provided at the other end. The yoke portion 62a is equivalent to Figure 2 The back yoke 33 of the stator core 31 shown in FIG. 1 is a portion of the back yoke 33 of the stator core 31. When the plurality of split cores 61 are arranged in a circumferential direction, the yoke portions 62a of the split cores 61 are connected to each other to form the annular back yoke 33. In addition, the yoke portions 62a of the adjacent split cores 61 may be joined to each other by bonding or the like.

[0086] The insulating members 63 and 64 are made of insulating resin materials and the like, and are attached to both ends of the tooth 34 in the axial direction. The insulating member 63 includes a covering portion 63a covering the axial end surface (upper surface in the figure) of the tooth 34, and rising portions 63b and 63c provided at one end and the other end of the covering portion 63a in the radial direction and extending in the axial direction (upward in the figure). The rising portion 63b is provided on one side of the yoke portion 62a in the radial direction, that is, on the base end side of the tooth 34, and the rising portion 63c is provided on the side opposite to the yoke portion in the radial direction, that is, on the tip end side of the tooth 34. Grooves 65a and 65b are provided at two locations in the circumferential direction in the rising portion 63b, through which the conductor wire of the partial winding can be inserted. The insulating member 64 also includes a covering portion 64a and rising portions 64b and 64c.

[0087] The split core 61 is configured by attaching insulating members 63 and 64 to a core body 62 , and a conductive wire is wound multiple times so as to span the insulating members 63 and 64 , so that partial windings are wound around the teeth 34 of the split core 61 .

[0088] Fig.10 1 is a perspective view showing a state where a partial winding is wound around a tooth group G, (a) is a perspective view viewed from the radial inside, and (b) is a perspective view viewed from the radial outside. Fig.10In (a) and (b), the tooth group G1 including teeth T1 to T3 is taken as an example. In the tooth group G1, the phase winding wound on teeth T1 and T2 (the phase winding of the W phase having partial windings W1 and W2) is referred to as the "first phase winding C1", and the phase winding wound on teeth T2 and T3 (the phase winding of the X phase having partial windings X1 and X2) is referred to as the "second phase winding C2". The second phase winding C2 of each phase winding C1 and C2 is the first winding that is wound first when winding, and the first phase winding C1 is the last winding that is wound last.

[0089] In the second phase winding C2 as the first winding group, the wire is wound in the order of tooth T3 → tooth T2 during the winding operation. In each of the teeth T2 and T3, the wire is wound in the opposite winding directions to each other. Fig.10 For example, in (a), the wire is wound counterclockwise around the tooth T3 with the number of turns Na, and then the wire is wound clockwise around the tooth T2 with the number of turns Nb. In the second phase winding C2, the wire end portion of the wire at the start of winding and the wire end portion of the wire at the end of winding are drawn out in the axial direction and form drawn portions H21 and H22 extending from the split core 61 by a predetermined length.

[0090] The pulled-out portion H21 on the side where winding starts is pulled out from the base end side of the tooth T3 (third tooth), and the pulled-out portion H22 on the side where winding ends is pulled out from the base end side of the tooth T2 (second tooth). In this case, in particular, in each split core 61, grooves 65a, 65b are provided in the rising portion 63b of the insulating component 63, and the pulled-out portion H21 is pulled out while being inserted into the groove 65a of the insulating component 63 corresponding to the tooth T3. In addition, the pulled-out portion H22 is pulled out while being inserted into the groove 65a of the insulating component 63 corresponding to the tooth T2. The pulled-out portions H21 and H22 are held by the groove 65a of the insulating component 63, and the groove 65a corresponds to the "holding portion".

[0091] In addition, in the second phase winding C2, the partial winding X1 wound on the tooth T3 and the partial winding X2 wound on the tooth T2 form a transition portion H23 spanning between these teeth T3 and T2, and the transition portion H23 is guided to the outside of the rising portion 63b of the insulating member 63. In detail, the transition portion H23 is a conductor wire from the position where the tooth winding of the partial winding X1 ends to the position where the tooth winding of the partial winding X2 begins, and the transition portion H23 is in a state of being pulled out to the outside of the rising portion 63b between the groove portion 65b on the tooth T3 side and the groove portion 65b on the tooth T2 side. In addition, as Fig.10 As shown in (b), a guide groove 65c is provided on the outer side surface of the rising portion 63b, and the transition portion H23 is guided while being inserted into the guide groove 65c. The rising portion 63b of the insulating member 63 corresponds to the "inter-tooth guide portion".

[0092] On the other hand, in the first phase winding C1 as the last winding group, the wire is wound in the order of tooth T1 → tooth T2. Here, comparing the first phase winding C1 and the second phase winding C2, in each of these phase windings C1 and C2, the winding operation is performed from the adjacent teeth on one side to the teeth on the other side in the order opposite to each other in the circumferential direction. That is, in the second phase winding C2 as the first winding group, the partial windings X1 and X2 are wound in the order from the adjacent teeth on the other side. Fig.10 The winding is carried out in a manner of moving from left to right in (a), whereas in the first phase winding C1 as the rear winding, the partial windings W1 and W2 are wound in a manner of moving from left to right. Fig.10 The winding is performed in a manner of moving from right to left as shown in (a).

[0093] In each of the teeth T1 and T2, the wire is wound in opposite winding directions. Fig.10 For example, in (a), the wire is wound counterclockwise around the tooth T1 with the number of turns Na, and then the wire is wound clockwise around the tooth T2 with the number of turns Nb. In the first phase winding C1, the wire end portion of the wire at the start of winding and the wire end portion of the wire at the end of winding are drawn out in the axial direction and form drawn portions H11 and H12 extending from the split core 61 by a predetermined length.

[0094] The pulled-out portion H11 on the side where winding starts is pulled out from the base end side of the tooth T1 (first tooth), and the pulled-out portion H12 on the side where winding ends is pulled out from the base end side of the tooth T2 (second tooth). In this case, the pulled-out portion H11 is pulled out in a state of being inserted into the groove portion 65a of the insulating member 63 corresponding to the tooth T1. In addition, the pulled-out portion H12 is pulled out in a state of being inserted into the groove portion 65b of the insulating member 63 corresponding to the tooth T2.

[0095] In addition, in the first phase winding C1, a transition portion H13 is formed between the partial winding W1 wound on the tooth T1 and the partial winding W2 wound on the tooth T2, which is spanned between these teeth T1 and T2. The transition portion H13 is different from the transition portion H23 of the second phase winding C2. The transition portion H13 is not guided to the outside of the rising portion 63b of the insulating part 63, but directly spans from the tooth T1 side to the tooth T2 side.

[0096] According to the above structure, the two extraction parts H11 and H12 of the first phase winding C1 and the two extraction parts H21 and H22 of the second phase winding C2 are arranged in the circumferential direction at the same position in the radial direction (i.e., the position on the base end side of each tooth). The other tooth groups G2 to G6 also have the same winding structure as the tooth group G1 (see Figure 4 , Figure 5 ).

[0097] As described above, in the first phase winding C1, the number of turns of the partial winding relative to the tooth T1 is "Na", and the number of turns of the partial winding relative to the tooth T2 is "Nb". In addition, in the second phase winding C2, the number of turns of the partial winding relative to the tooth T3 is "Na", and the number of turns of the partial winding relative to the tooth T2 is "Nb". The relationship between these numbers of turns is Na / 2<Nb. That is, in the present embodiment, the numbers of turns of the teeth T1 and T3 at both ends of each of the three consecutive teeth T1 to T3 in the circumferential direction are "Na", and the number of turns of the central tooth T2 is "2Nb", and their relationship is "Na<2Nb". The upper limit of the number of turns Nb is, for example, the number of turns Na.

[0098] In this case, the amount of wire in the center tooth T2 (common tooth) of the three consecutive teeth T1 to T3 is larger than that in the teeth T1 and T3 at both ends, so when the wire is wound around the common teeth, there is a concern that winding may be disordered. In this regard, in the present embodiment, the extraction position of the wire end of each phase winding is specified, the transition portion H23 of the second phase winding C2 (preliminary winding group) is guided by the rising portion 63b of the insulating member 63, and the wire end is held by the groove portion 65a of the insulating member 63, thereby suppressing the inconvenience caused by the disorder of the wire winding.

[0099] In the present embodiment, the bus bar module 70 is mounted on one side of one axial end of the stator 30 , which will be described in detail below. Fig.11 is a perspective view of the bus module 70 .

[0100] The busbar module 70 has a plurality of busbars 71 and a busbar frame 72 for holding the busbars 71. The busbars 71 include a busbar 73 for each phase provided for each phase of each stator winding 32a, 32b and a busbar 74 for a neutral point. The busbar 73 for each phase is a conductive member that connects partial windings of the same phase to each other, and the busbar 74 for a neutral point is a conductive member that connects partial windings of each phase through a star connection. In this embodiment, six busbars, namely, a U-phase busbar, a V-phase busbar, a W-phase busbar, an X-phase busbar, a Y-phase busbar, and a Z-phase busbar, are provided as the busbars 73 for each phase, and two busbars, namely, a neutral point busbar of the first stator winding 32a and a neutral point busbar of the second stator winding 32b, are provided as the busbars for a neutral point. In addition, here, a structure in which each of the stator windings 32a and 32b is provided with one neutral point is exemplified.

[0101] Fig.12(a) is a three-dimensional diagram showing the structure of a bus bar 73 for each phase. The bus bar 73 for each phase is generally arc-shaped, with arms 73a extending in the radial direction at both ends, and a winding connection portion 73b connected to the phase winding of each phase is provided at the top end of each arm 73a. In addition, a power terminal portion 73c for inputting and outputting power to each phase is provided in the arc portion. Fig.11 As shown, in the busbars 73 of the respective phases, the radial lengths of the arm portions 73a and the circumferential positions of the power terminal portions 73c are different.

[0102] in addition, Fig.12 (b) is a perspective view showing the structure of a bus bar as a neutral point bus bar 74. The neutral point bus bar 74 is generally arc-shaped, and is provided with radially extending arms 74a at multiple locations (six locations in the present embodiment) in the long side direction thereof, and a neutral point connecting portion 74b connected to the neutral point side end of the phase winding of each phase is provided at the top end of each arm portion 74a.

[0103] Fig.13 : is a three-dimensional diagram showing the structure of the bus frame 72. The bus frame 72 is made of, for example, an insulating resin material and is formed into a circular ring shape. The bus frame 72 has a plurality of grooves 72a extending in an arc shape in the circumferential direction. These plurality of grooves 72a are formed in multiple layers radially inside and outside, and each bus 73, 74 is assembled in each groove 72a in a manner that the bus plate surfaces face each other in the radial direction. In addition, a plurality of protrusions 72b are provided on the upper surface of the bus frame 72. The protrusions 72b are supporting portions for supporting the arm portions 73a, 74a of each bus 73, 74, and are respectively provided in a dispersed manner in the circumferential direction according to the positions of the arm portions 73a, 74a.

[0104] A plurality of through holes 72c are provided on the outer edge of the busbar frame 72, i.e., on the radially outer side of each groove 72a, and penetrate in the axial direction (the vertical direction in the figure). The through holes 72c are provided as the extraction part of the wire ends of each phase winding, i.e., Fig.10 The through holes 72c are inserted through the extraction parts H11, H12, H21, and H22 shown in (a) and the like. In the present embodiment, in the busbar module 70, the through holes 72c as the wire connection parts are concentratedly provided at the outer edge of the busbar frame 72. In addition, the busbar frame 72 is provided with a plurality of assembly parts 72d for assembling the busbar module 70 to the stator core 31.

[0105] Fig.14 2 is a perspective view showing a state where the busbar module 70 is assembled in the stator 30. Fig.14 In the embodiment, the bus bar module 70 is assembled on one side of one axial end of the stator core 31 in a coaxial state with the stator core 31 .

[0106] The lead-out portion as the end of the conductor of each phase winding is connected to each busbar 73, 74 on the upper surface side of the busbar frame 72 in a state where it is inserted into the through hole 72c of the busbar frame 72. Specifically, the end of the conductor of each phase winding and the connecting portion 73b, 74b of each busbar 73, 74 are joined by welding or the like. Thus, in each stator winding 32a, 32b, the phase winding of each phase is connected to each other in a desired manner. In addition, the power line 75 is connected to the power terminal portion 73c of the busbar 73 for each phase for each phase.

[0107] However, in the rotating electric machine, noise and vibration caused by torque pulsation become a problem. Torque pulsation mainly has 6th harmonic component or 12th harmonic component as main component, so it is preferable to suppress them. Therefore, the motor 10 with the above structure can be used to perform the following control in the control device 50.

[0108] In the motor 10 of the above structure,

[0109] The partial windings (first coil bodies) of the U phase, V phase, and W phase in the first stator winding 32a are wound around the first teeth (T1, T4, T7, T10, T13, and T16) of each tooth group, and the partial windings (second coil bodies) of any one phase in the first stator winding 32a and the second stator winding 32b are wound around the second teeth (T2, T5, T8, T10, T14, and T17) of each tooth group.

[0110] Each partial winding (third coil body) of the X phase, Y phase, and Z phase in the second stator winding 32 b is wound around the third teeth ( T3 , T6 , T9 , T12 , T15 , and T18 ) of each tooth group.

[0111] Furthermore, in the structure involved, the control device 50 sets the total phase difference of the magnetomotive force generated by the partial winding of the first stator winding 32a wound on the second tooth and the magnetomotive force generated by the partial winding of the second stator winding 32b wound on the second tooth in such a manner that each phase difference of the magnetomotive force of the second coil body of each phase relative to the magnetomotive force of the first coil body of each phase and each phase difference of the magnetomotive force of the third coil body of each phase relative to the magnetomotive force of the second coil body of each phase are within a prescribed phase range including an electrical angle of 20 degrees, or each phase difference of the magnetomotive force of the third coil body of each phase relative to the magnetomotive force of the first coil body of each phase and each phase difference of the magnetomotive force of the second coil body of each phase relative to the magnetomotive force of the third coil body of each phase are within a prescribed phase range including an electrical angle of 20 degrees. The total phase difference can be set, for example, in the range of an electrical angle of 72 to 88 degrees. Alternatively, the control device 50 sets the total phase difference between the current flowing through the partial winding of the first stator winding 32a wound around the second tooth and the current flowing through the partial winding of the second stator winding 32b wound around the second tooth. The details of this control are described in detail in Japanese Patent No. 7103299 applied for by the applicant of this application.

[0112] According to the present embodiment described in detail above, the following excellent effects can be obtained.

[0113] In the stator core 31, a part of the winding of the first phase winding C1 is continuously wound around the first tooth and the second tooth, and a part of the winding of the second phase winding C2 is continuously wound around the second tooth and the third tooth, among three teeth that are continuous in the circumferential direction. In this structure, one end of the first phase winding C1 is drawn out from the base end side of the first tooth, and the other end is drawn out from the base end side of the second tooth. On the other hand, one end of the second phase winding C2 is drawn out from the base end side of the third tooth, and the other end is drawn out from the base end side of the second tooth (see Fig.10 (a), (b)). Thus, the connection to the power supply side of the conductor end and the connection to the neutral point in each phase winding can be appropriately implemented while treating three teeth 34 as a group. As a result, the phase windings of two phases can be appropriately wound around each of the three teeth 34 that are continuous in the circumferential direction.

[0114] When the second tooth in the middle of three teeth in a row from the first to the third in the circumferential direction is used as a common tooth and two phase windings (the first phase winding C1 and the second phase winding C2) are respectively wound on the common tooth, there is a concern that the transition portion between the teeth in the first winding group may become an obstacle when the second winding group is wound on the second tooth. In this regard, since a rising portion 63b (inter-tooth guide portion) for guiding the transition portion H23 of the first winding group is provided at the axial end of the stator core 31 and radially outside the tooth 34, it is possible to prevent the transition portion H23 between the teeth 34 in the first winding group from becoming an obstacle when the second winding group is wound.

[0115] The transition portion H23 between teeth in the pre-wound winding is guided by an insulating member 63 provided at the axial end of the stator core 31 (split core 61) and insulating the teeth 34 from the partial winding. The insulating member 63 can achieve insulation between the teeth 34 and the partial winding and appropriately guide the transition portion H23 between teeth.

[0116] In the second phase winding C2 (first winding group), when the winding directions of the wires of the partial windings wound on the second and third teeth are opposite to each other, it is considered that the loosening of the wire material in the transition portion H23 is more likely to occur than when the winding directions are the same. That is, when the wire material is wound in opposite directions at the adjacent teeth, it is considered that it will become a cause of tension reduction and loosening at the transition portion H23. In addition, in the second phase winding C2, if the wire material at the transition portion H23 is loosened, there is a concern that it will affect the first phase winding C1 (latter winding group). In this regard, since the transition portion H23 of the second phase winding C2 is guided to the rising portion 63b of the insulating component 63, the loosening of the transition portion can be suppressed, and each phase winding can be properly wound.

[0117] The lead-out portions H11, H12, H21, and H22 (the ends of the wires at the start and end of the winding) of the first phase winding C1 and the second phase winding C2 are held by the groove portion 65a of the insulating member 63. As a result, the positions of the ends of the wires of the respective phase windings C1 and C2 can be appropriately determined, and connection to a bus bar or the like becomes easy. In addition, during the winding operation of the respective phase windings, it is possible to expect an effect such as suppressing loosening of the wire material.

[0118] The stator core 31 is constituted by a plurality of split cores 61, and a holding portion (groove portion 65a) for holding the wire ends of each phase winding C1, C2 is provided for each split core 61. In this case, in a structure in which a partial winding is wound around each of the teeth 34 of each split core 61, the wire ends drawn out from the partial winding can be appropriately held.

[0119] The number of turns of the partial winding of the teeth 34 at both ends (the first tooth and the third tooth) of each of the three teeth 34 continuous in the circumferential direction is Na, and the number of turns of the partial winding of the central tooth 34 (the second tooth) is Nb. When the relationship between these numbers of turns is Na / 2<Nb, the amount of wire in the central tooth 34, that is, the common tooth, is increased compared with the other teeth. Therefore, when the wire is wound around the common teeth, there is a concern that the winding may be disordered. In this regard, by specifying the extraction position of the wire end (extraction portion H11, H12, H21, H22) of each phase winding, it is possible to suppress the inconvenience caused by the winding of the wire.

[0120] In addition, by guiding the transition portion H23 of the second phase winding C2 to the rising portion 63b of the insulating member 63 or holding the wire end by the groove portion 65a of the insulating member 63, it is also expected to have the effect of suppressing the inconvenience caused by the winding of the wire.

[0121] In each phase winding C1, C2 wound around three consecutive first to third teeth in the circumferential direction, the wire end is drawn out from the base end side of each tooth 34, in other words, the wire end is drawn out from a predetermined position relative to each tooth 34. In this case, the wire end of each phase winding C1, C2 can be easily and appropriately connected to the busbar module 70 provided on one side of one axial end of the stator core 31.

[0122] The total of 18 teeth 34 in the stator core 31 are divided into six tooth groups G1 to G6, and two phase windings C1 and C2 are wound around each of these tooth groups G1 to G6, and an annular busbar module 70 is assembled. Thus, the stator winding 32 can be appropriately wound around all teeth, and the busbar module 70 can be easily and appropriately assembled to the partial winding of each tooth group G1 to G6.

[0123] (Second Embodiment)

[0124] The second embodiment will be described below with a focus on the differences from the first embodiment. In this embodiment, compared with the first embodiment, the winding method of the first phase winding C1 and the second phase winding C2 in each tooth group G consisting of three teeth 34 continuous in the circumferential direction is different, and its specific structure will be described below.

[0125] Fig.15 is a perspective view showing a state where a portion of the winding is wound around the tooth group G1. Fig.16 The tooth group G1 is viewed from the axial direction. In the present embodiment, during the winding operation, two different phase windings C1 and C2 are wound continuously. Fig.15 , the state where the phase windings C1 and C2 are connected via the intermediate portion H3 is shown. In this embodiment, as in the first embodiment, the second phase winding C2 is used as the first winding, and the first phase winding C1 is used as the last winding.

[0126] exist Fig.15 In the structure of , during the winding operation of the wire rod, the wire rod corresponding to the second phase winding C2 (first winding group) is wound in the order of tooth T3 → tooth T2, and then the wire rod corresponding to the first phase winding C1 (latter winding group) is wound in the order of tooth T2 → tooth T1. In the winding portion corresponding to C1, the transition portion H41 is between teeth T1 and T2, and in the winding portion corresponding to C2, the transition portion H42 is between teeth T2 and T3.

[0127] In this case, in tooth T3, after partial winding X1 is wound with number of turns Na, partial winding X2 is wound with number of turns Nb in tooth T2 via transition portion H42. In addition, after intermediate portion H3 is stretched in the axial direction, partial winding W2 is wound with number of turns Nb in tooth T2, and partial winding W1 is wound with number of turns Na in tooth T1 via transition portion H41. Fig.15 , the winding direction of the winding of the teeth T1 and T3 is counterclockwise, and the winding direction of the winding of the tooth T2 is clockwise.

[0128] In the winding portion corresponding to C1, the extraction portion H11 and the transition portion H41 can be respectively inserted into the grooves 65a and 65b of the insulating member 63. In addition, in the winding portion corresponding to C2, the extraction portion H21 and the transition portion H42 can also be respectively inserted into the grooves 65a and 65b of the insulating member 63.

[0129] Fig.16 It means in Fig.15 After the winding is formed, the middle portion H3 is disconnected to separate the first phase winding C1 and the second phase winding C2 from each other. In this case, by disconnecting the middle portion H3, the extraction portions H51 and H52, which are the ends of the wires of the phase windings C1 and C2, are formed. Fig.16 In the structure, two extraction parts H11 and H21 are provided on the radially outer side (tooth base end side), and two extraction parts H51 and H52 are provided on the radially inner side (tooth tip end side), and these extraction parts are stretched in the axial direction. In the bus bar frame 72 of the bus bar module 70, through holes 72c are formed respectively according to the positions of the extraction parts.

[0130] According to this embodiment, in each tooth group, two phase windings C1 and C2 can be continuously wound on three teeth, and the winding operation can be made more efficient. In addition, by distributing the four extraction parts H11, H21, H51, and H52 in pairs in the radial direction inside and outside, for example, when welding with each bus bar 73 and 74 in the bus bar module 70, the interval between each welding position can be expanded, and the welding operation can be simplified.

[0131] (Other embodiments)

[0132] The above-mentioned embodiment can be modified as follows, for example.

[0133] In the above embodiment, in the second phase winding C2 as the first winding group, the structure of winding part is in the order of third tooth → second tooth, but it can be changed to a structure of winding part in the order of second tooth → third tooth. In addition, in the above embodiment, in the first phase winding C1 as the last winding group, the structure of winding part is in the order of first tooth → second tooth, but it can be changed to a structure of winding part in the order of second tooth → first tooth.

[0134] exist Fig.10 In the structures shown in (a) and (b), one end and the other end of each phase winding C1 and C2 can be drawn out from the tip side of each tooth 34, that is, the opposite side of the back yoke of each tooth 34. In this case, the radially inner side rising portion 63c (see Fig. 9 (a)) is the inter-tooth guide portion. That is, the transition portion H23 spanning between adjacent teeth in the second phase winding C2 (preliminary winding group) may be guided to the outside (radially inside) by the rising portion 63b of the insulating member 63.

[0135] In addition, in the two phase windings wound on three consecutive first to third teeth in the circumferential direction, a structure in which one end of each phase winding is pulled out from the base end side (back yoke side) of each tooth, and the other end is pulled out from the top end side (anti-back yoke side) of each tooth can also be adopted.

[0136] In the above embodiment, if Figure 7 As shown in (a), in the first stator winding 32a, the partial windings U1 to U4, V1 to V4, and W1 to W4 of each phase are grouped in pairs and connected in a star connection, but this can also be changed. For example, Fig.17 As shown in (a), it is also possible to connect the partial windings U1 to U4, V1 to V4, and W1 to W4 of each phase in series, and connect these three-phase series connections through a star connection. The same is true for the second stator winding 32b. Fig.17 As shown in (b), partial windings X1 to X4, Y1 to Y4, and Z1 to Z4 of each phase are connected in series, and these three-phase series connections are connected in a star connection.

[0137] In each of the stator windings 32a and 32b, the phase windings of each phase can be connected by a Δ connection instead of a star connection (Y connection).

[0138] In the stator core 31, each split core 61 may have a plurality of teeth 34. For example, the split core 61 may have three teeth 34. In addition, the stator core 31 may not be a split core structure, that is, may be an integral annular structure that cannot be split in the circumferential direction.

[0139] The number of teeth of the stator core 31 may be other than 18. However, in this case, the number of teeth may be 3×n.

[0140] In the above embodiment, the stator winding 32 has the first stator winding 32a and the second stator winding 32b, and has a total of six phase windings. However, this may be changed so that the stator winding 32 has a three-phase winding structure.

[0141] The rotating electric machine may be an outer rotor type rotating electric machine instead of an inner rotor type rotating electric machine.

[0142] The following describes technical ideas extracted from the above-mentioned embodiments.

[0143] [Structure 1]

[0144] A stator (30) comprising:

[0145] A stator core (31) having a back yoke (33) in an annular shape and a plurality of teeth (34) extending radially from the back yoke and arranged at predetermined intervals in the circumferential direction; and

[0146] A stator winding (32) having a plurality of phase windings provided for each phase, wherein:

[0147] Each of the phase windings has a plurality of partial windings, and the plurality of partial windings are respectively wound around the teeth by concentrated winding.

[0148] Among the plurality of teeth, in three circumferentially consecutive first teeth, second teeth, and third teeth, a portion of a first phase winding (C1) among the plurality of phase windings is continuously wound around the first teeth and the second teeth, and a portion of a second phase winding (C2) among the plurality of phase windings is continuously wound around the second teeth and the third teeth,

[0149] One end of the first phase winding is drawn out from the base end side or the tip end side of the first tooth, and the other end is drawn out from the base end side or the tip end side of the second tooth.

[0150] On the other hand, one end of the second phase winding is drawn out from the base end side or the tip end side of the third tooth, and the other end is drawn out from the base end side or the tip end side of the second tooth.

[0151] [Structure 2]

[0152] In the stator described in Structure 1,

[0153] The second phase winding of the first phase winding and the second phase winding is a leading winding that is wound first when the winding is wound, and the first phase winding is a trailing winding that is wound last.

[0154] An inter-tooth guide portion (63b) is provided at an axial end of the stator core and radially outward or inward compared to the teeth, and the inter-tooth guide portion guides a transition portion (H23) which is arranged between the second tooth and the third tooth in the pre-winding group.

[0155] [Structure 3]

[0156] In the stator described in Structure 2,

[0157] An insulating component (63) is provided at an axial end of the stator core, the insulating component insulating the teeth from the partial winding.

[0158] The insulating component has a rising portion (63b, 63c) on at least one of the base end side and the tip end side of the tooth, the rising portion is arranged in a manner extending in the axial direction, the rising portion functions as the inter-tooth guide portion, and the transition portion is bridged on the side of the rising portion opposite to the tooth.

[0159] [Structure 4]

[0160] In the stator described in structure 2 or 3,

[0161] In the pre-winding group, one side and the other side of the transition portion guided by the inter-tooth guide portion are respectively a partial winding wound on the second tooth and a partial winding wound on the third tooth, and the winding directions of the wires of these partial windings are opposite to each other.

[0162] [Structure 5]

[0163] In the stator described in any one of structures 1 to 4,

[0164] An insulating component (63) is provided at an axial end of the stator core, the insulating component insulating the teeth from the partial winding.

[0165] The insulating component has a retaining portion (65a, 65b) which is provided on the base end side or the tip end side of the tooth and retains the wire end portion which is the side where the winding of each wire material in the first phase winding and the second phase winding starts and ends.

[0166] [Structure 6]

[0167] In the stator described in Structure 5,

[0168] The stator core is composed of a plurality of split cores (61) that can be split in the circumferential direction and each of which has the teeth, and the holding portion is provided on each of the split cores.

[0169] [Structure 7]

[0170] In the stator described in any one of structures 1 to 6,

[0171] When the number of turns of the partial winding with respect to the first tooth and the third tooth is Na and the number of turns of the partial winding with respect to the second tooth is Nb, the relationship between these numbers of turns is Na / 2<Nb.

[0172] [Structure 8]

[0173] In the stator described in any one of structures 1 to 7,

[0174] A busbar module (70) is provided, the busbar module having busbars (73, 74) and a busbar frame (72), the busbar being electrically connected to the ends of the wires of the phase windings, and the busbar frame holding the busbar.

[0175] The conductor ends as one end and the other end of each phase winding are drawn out in an axially extending manner and inserted into insertion holes (72c) provided on the bus bar frame, and are connected to the bus bar.

[0176] [Structure 9]

[0177] In the stator described in structure 8,

[0178] The stator core has 3×n teeth, and the teeth in groups of three in the circumferential direction are tooth groups (G1 to G6).

[0179] The busbar module is in the shape of a circular ring coaxial with the stator core.

[0180] Two phase windings corresponding to the first phase winding and the second phase winding are wound around each of the tooth groups.

[0181] The bus bar module is assembled on one axial end side of the stator core.

[0182] The present invention is described based on the embodiments, but it should be understood that the present invention is not limited to the embodiments and structures. The present invention also includes various modifications and variations within the equivalent range. In addition, various combinations and modes, and further combinations and modes including only one element, above or below them, are also included in the scope and thought scope of the present invention.

Claims

1. A stator (30), comprising: A stator core (31) having a back yoke (33) in an annular shape and a plurality of teeth (34) extending radially from the back yoke and arranged at predetermined intervals in the circumferential direction; and a stator winding (32) having a plurality of phase windings provided for each phase, It is characterized in that Each of the phase windings has a plurality of partial windings, and the plurality of partial windings are respectively wound around the teeth by concentrated winding. Among the plurality of teeth, in three circumferentially consecutive first teeth, second teeth, and third teeth, a portion of a first phase winding (C1) among the plurality of phase windings is continuously wound around the first teeth and the second teeth, and a portion of a second phase winding (C2) among the plurality of phase windings is continuously wound around the second teeth and the third teeth, One end of the first phase winding is drawn out from the base end side or the tip end side of the first tooth, and the other end is drawn out from the base end side or the tip end side of the second tooth. On the other hand, one end of the second phase winding is drawn out from the base end side or the tip end side of the third tooth, and the other end is drawn out from the base end side or the tip end side of the second tooth.

2. The stator according to claim 1, characterized in that: The second phase winding of the first phase winding and the second phase winding is a leading winding that is wound first when the winding is wound, and the first phase winding is a trailing winding that is wound last. An inter-tooth guide portion (63b) is provided at an axial end of the stator core and radially outward or inward compared to the teeth, and the inter-tooth guide portion guides a transition portion (H23) which is arranged between the second tooth and the third tooth in the pre-winding group.

3. The stator according to claim 2, characterized in that: An insulating component (63) is provided at an axial end of the stator core, the insulating component insulating the teeth from the partial winding. The insulating component has a rising portion (63b, 63c) on at least one of the base end side and the tip end side of the tooth, the rising portion is arranged in a manner extending in the axial direction, the rising portion functions as the inter-tooth guide portion, and the transition portion is bridged on the side of the rising portion opposite to the tooth.

4. The stator according to claim 2, characterized in that: In the pre-winding group, one side and the other side of the transition portion guided by the inter-tooth guide portion are respectively a partial winding wound on the second tooth and a partial winding wound on the third tooth, and the winding directions of the wires of these partial windings are opposite to each other.

5. The stator according to claim 1, characterized in that: An insulating component (63) is provided at an axial end of the stator core, the insulating component insulating the teeth from the partial winding. The insulating component has a retaining portion (65a, 65b) which is provided on the base end side or the tip end side of the tooth and retains the wire end portion which is the side where the winding of each wire material in the first phase winding and the second phase winding starts and ends.

6. The stator according to claim 5, characterized in that: The stator core is composed of a plurality of split cores (61) that can be split in the circumferential direction and each of which has the teeth, and the holding portion is provided on each of the split cores.

7. The stator according to any one of claims 1 to 6, characterized in that: When the number of turns of the partial winding for the first tooth and the third tooth is Na and the number of turns of the partial winding for the second tooth is Nb, the relationship between these numbers of turns is Na / 2<Nb.

8. The stator according to claim 1, characterized in that: A busbar module (70) is provided, the busbar module having busbars (73, 74) and a busbar frame (72), the busbar being electrically connected to the ends of the wires of the phase windings, and the busbar frame holding the busbar. The conductor ends, which are one end and the other end of each phase winding, are drawn out in an axially extending manner and inserted into insertion holes (72c) provided on the bus bar frame, and are connected to the bus bar.

9. The stator according to claim 8, characterized in that: The stator core has 3×n teeth, and the teeth in groups of three in the circumferential direction are tooth groups (G1 to G6). The busbar module is in the shape of a circular ring coaxial with the stator core. Two phase windings corresponding to the first phase winding and the second phase winding are wound around each of the tooth groups. The bus bar module is assembled on one axial end side of the stator core.

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