Fixer

Abstract

To suitably wind a first winding wire and a second winding wire around the same tooth.SOLUTION: As stator winding wires, a first winding wire 101 and a second winding wire 102 of different phases are wound around a tooth 34 of a stator core 31. Specifically, in the tooth 34 around which the first winding wire 101 and the second winding wire 102 are wound, within a first range R1 from a first end 34a on one side in a radial direction to a midpoint in the radial direction, the first winding wire 101 is wound by layering multiple conductive wire materials on the tooth 34, and, within a second range R2 from a second end 34b on the other side in the radial direction to a position overlapping the first winding wire 101, the second winding wire 102 is wound. The first winding wire 101 is wound with winding-starting ends and winding-ending ends of the conductive wire materials positioned on the first end 34a side. The second winding wire 102 is wound so as to partially overlap the first winding wire 101.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present invention relates to a stator.

Background Art

[0002] In a rotating electric machine including a stator and a rotor, a configuration in which a stator winding is wound around teeth of a stator core by concentrated winding is known. Further, a configuration in which two phase windings having different phases from each other are wound around the same teeth of a stator core is known. For example, in Patent Document 1, a configuration in which two phase windings having different phases from each other are wound around one region and the other region that are radially divided in the teeth is described.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configuration in which two phase windings are wound around each region radially divided in the teeth as described above, the conductor ends provided for each of these phase windings are separated into the radially inner side and the radially outer side, and there is a concern that the terminal processing of connecting the conductor ends to each other at the coil end or connecting each conductor end to a connecting member such as a bus bar becomes complicated. Further, in the configuration in which two phase windings are wound in a state of being laminated on each other, there is a concern that the winding wound later interferes with the conductor end drawn out from the winding wound first when winding two phase windings around the same teeth.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a stator capable of suitably winding a first winding and a second winding around the same teeth.

Means for Solving the Problems

[0006] The following describes the means to solve the above problems and their effects.

[0007] Method 1 is, A stator core having an annular back yoke and a plurality of teeth extending radially from the back yoke and provided at predetermined intervals in the circumferential direction, A stator having a multiphase stator winding in which a conductor material is wound around the teeth by concentrated winding, On a predetermined tooth among the plurality of teeth, a first winding and a second winding, which are in different phases from each other, are wound as the stator winding, wherein the first winding is the winding wound on the tooth first, and the second winding is the winding wound on the tooth later. In the teeth around which the first winding and the second winding are wound, the first winding is wound around the teeth in a first range from the first end on one radial side to an intermediate radial position, with the conductor material overlapping in multiple layers, and the second winding is wound around the teeth in a second range from the second end on the other radial side to a position overlapping with the first winding. The first winding is characterized in that the starting and ending ends of the conductor material are wound with the first end facing the first end, and the second winding is wound such that a portion of it overlaps the first winding.

[0008] In a configuration where a first winding and a second winding, which are in different phases, are wound on the same teeth of the stator core, there is a concern that the terminal processing of each winding (terminal processing at the coil end) will become complicated. Furthermore, when each winding is wound in a stacked state, there is a concern that the starting and ending ends of the first winding, which is wound first, will interfere with the winding of the second winding, which is wound later. In this regard, in the teeth around which the first and second windings are wound, by winding the first winding with multiple layers of conductor material on the teeth in a first range from the first end on one side in the radial direction to the intermediate position in the radial direction, the first winding can be positioned towards one side of the teeth in the radial direction, and consequently, the ends of the conductor material in the first winding (starting and ending ends) can be suitably concentrated towards the first end side of the teeth. This prevents the inconvenience of the starting and ending ends of the first winding interfering with the winding of the second winding. Furthermore, by winding the second winding in a second range from the second end on the other radial side of the tooth to the position where it overlaps with the first winding, the second winding can be wound closer to the first end while overlapping with the first winding, using the empty area in the tooth where the first winding is not wound. This allows the end of the conductor material of the second winding to be brought closer to the first end. As a result, the first and second windings can be suitably wound in the same tooth.

[0009] In method 2, the first winding is wound with the first end as the starting position and the position overlapping the conductor material at the starting position as the ending position, and the second winding is wound from the starting position toward the center of the teeth between the radial ends of the teeth, which is closer to the center of the teeth than the starting position of the first winding, and toward the center of the teeth.

[0010] According to the above configuration, the first winding is wound with the first end of the teeth as the starting position and the position overlapping the conductor material at the starting position as the ending position, thus achieving a configuration suitable for positioning the first winding towards one side of the teeth in the radial direction. Furthermore, since the starting position of the second winding is set to be closer to the center of the teeth between the radial ends of the teeth than the starting position of the first winding, and the winding is performed toward the center of the teeth, the second winding can be wound suitably while avoiding interference with the end of the first winding.

[0011] In means 3, the conductor material is a round wire with a circular cross-section, the first winding and the second winding are wound around the teeth in a staggered arrangement of the conductor material, and the second winding is wound starting from a position one turn's worth of space away from the first end.

[0012] In a configuration using round wire as the conductor material, the space utilization rate can be improved by winding the first and second windings in a staggered arrangement. Furthermore, with the staggered arrangement of round wires, it is relatively easy to shift the radial position of the starting position of the second winding, and interference between the end of the first winding and the second winding can be suitably avoided.

[0013] In method 4, the second winding is wound around the teeth in multiple layers, starting from the first end and folding back at the second end.

[0014] With the above configuration, the start and end points of the conductor material for each of the first and second windings can be concentrated on the first end side of the teeth. This improves the workability of terminal processing when connecting multiple first windings that make up the stator winding, multiple second windings that make up the stator winding, or when connecting the first and second windings.

[0015] In means 5, the teeth are provided with projections that are perpendicular to the radial direction and extend away from the surface of the teeth at the boundary position on the side opposite the first end in the first range around which the first winding is wound.

[0016] As described above, when the first winding is wound around the teeth with multiple layers of conductor material overlapping in the first range from the first end of the teeth to the radial intermediate position, there is a concern that the winding may collapse due to misalignment of the conductor material at the intermediate position of the teeth. In this regard, since a projection is provided on the teeth at the boundary position of the first range around which the first winding is wound (the boundary on the intermediate position side), the collapse of the first winding can be suppressed.

[0017] In means 6, an insulating member is attached to the axial end of the teeth, and the first winding and the second winding are wound around the teeth with the insulating member interposed between them. The insulating member has a first insulating portion which corresponds to the first range in the radial direction, and a second insulating portion which is outside the first range, and the axial thickness of the first insulating portion is smaller than that of the second insulating portion.

[0018] In the insulating member attached to the axial end of the teeth, the axial thickness dimensions are made different between the first insulating portion, which corresponds to the first range, and the second insulating portion, which is outside the first range, with the first insulating portion having a smaller axial thickness than the second insulating portion. In this case, a step can be created between the first insulating portion and the second insulating portion, and this step can suppress the unwinding of the first winding.

[0019] Furthermore, in the teeth, both the first and second windings are wound in a laminated state within the first range, whereas in areas outside the first range, only the second winding is wound. In this configuration, the first insulating section corresponding to the first range has a smaller axial thickness than the second insulating section, which suppresses the excessively large axial length dimension in the first range compared to other areas, thereby equalizing the winding axial length dimension in the radial direction of the teeth.

[0020] In means 7, the stator winding has a plurality of phase windings provided for each phase, and each of the phase windings is wound around the teeth by concentrated winding. In the stator core, when the teeth that are circumferentially continuous in three directions are designated as the first tooth, second tooth, and third tooth, the first phase winding of the plurality of phase windings is continuously wound around the first tooth and the second tooth, and the second phase winding of the plurality of phase windings is continuously wound around the second tooth and the third tooth, and the second tooth is a tooth around which both the first and second windings are wound. One end and the other end of the first phase winding are each drawn out from the ends on the back yoke side of the radial ends of the first teeth and the second teeth, respectively. One end and the other end of the second phase winding are drawn out from the ends on the back yoke side of the radial ends of the third teeth and the second teeth, respectively. Of the first phase winding and the second phase winding, the first phase winding is a pre-winding winding that is wound first during winding, and the second phase winding is a post-winding winding that is wound later. The first phase winding is continuous between the first teeth and the second teeth by a connecting portion that extends circumferentially along the back yoke.

[0021] For example, in order to reduce the ripple current in the stator, it is conceivable to wind two phase windings (the first phase winding and the second phase winding) having different phases from each other in each of three consecutive teeth in the circumferential direction. Specifically, among the first to third teeth that are consecutive in the circumferential direction in the stator core, it is conceivable to continuously wind the first phase winding around the first and second teeth, and continuously wind the second phase winding around the second and third teeth. In such a configuration, one end and the other end of the first phase winding are respectively drawn out from the end portions on the back yoke side of the radial both ends of the first tooth and the second tooth, while one end and the other end of the second phase winding are respectively drawn out from the end portions on the back yoke side of the radial both ends of the third tooth and the second tooth. Thereby, while taking three teeth as a set, it is possible to suitably perform the connection of the conductor end portions of each phase winding to the power supply side and the connection of the neutral point. Further, since the first phase winding, which is the pre-wound winding, is configured to be continuous by a connecting portion that extends in the circumferential direction along the back yoke between the first tooth and the second tooth, a plurality of conductor end portions generated in each tooth unit are all processed on the back yoke side.

[0022] In means 8, an insulating member for insulating the teeth and the stator winding is provided at an axial end portion of the stator core. The insulating member has a standing portion provided so as to extend axially on the back yoke side of the teeth. A holding portion for holding the connecting portion, which is one end portion of the start end and the end end of the first winding wound around the second tooth, and the other end portion is provided on the standing portion.

[0023] In the configuration where the first-phase winding is continuously wound around the first tooth and the second tooth, in the first winding of the first-phase winding wound around the second tooth, the connecting portion extending from the first tooth side becomes the start end of winding, and the opposite side becomes the end of winding. Or conversely, the connecting portion extending from the first tooth side becomes the end of winding, and the opposite side becomes the start end of winding. In this case, the start end and the end of winding of the first winding are held using the upright portion provided on the back yoke side of the insulating member. Thereby, while holding the start end and the end of winding of the first winding on the back yoke side, it is possible to suitably avoid interference during the winding of the second winding.

Brief Description of the Drawings

[0024] [Figure 1] Vertical sectional view of the motor. [Figure 2] Cross-sectional view of the motor. [Figure 3] Diagram showing the electrical configuration of the control device. [Figure 4] Perspective view of the stator. [Figure 5] Plan view of the stator. [Figure 6] Perspective view showing the configuration of the stator core. [Figure 7] Winding configuration diagram of the stator winding. [Figure 8] Diagram showing the correspondence between each partial winding of the stator winding and the teeth. [Figure 9] Diagram showing the configuration of the split core. [Figure 10] Perspective view showing a state where a partial winding is wound around one tooth group. [Figure 11] Diagram showing the winding order of the conductor material in the central tooth A2 of the tooth group. [Figure 12] Perspective view showing the winding structure in tooth A2. [Figure 13] Perspective view of the bus bar module. [Figure 14] Perspective view showing the configuration of the bus bar. [Figure 15] Perspective view showing the configuration of the bus bar holder. [Figure 16] A perspective view showing the busbar module assembled to the stator. [Figure 17] A diagram showing a winding of wire around teeth in another example. [Figure 18] A diagram showing a winding of wire around teeth in another example. [Figure 19] A diagram showing a winding of wire around teeth in another example. [Figure 20] A diagram illustrating the winding configuration of a stator winding in an alternative example. [Modes for carrying out the invention]

[0025] (First Embodiment) The embodiments will be described below with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are denoted by the same reference numerals in the drawings, and the explanations for such parts will be based on those same reference numerals. In the first embodiment, a motor 10 as a rotating electric machine will be described as an example.

[0026] The motor 10 shown in Figure 1 is a permanent magnet field type, specifically a permanent magnet field synchronous machine having three phase windings. In other words, the motor 10 is a brushless motor. It may have two sets of three phase windings. The motor 10 comprises 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, axial direction refers to the axial direction of the rotating shaft 11, radial direction refers to the radial direction of the rotating shaft 11, and circumferential direction refers to the circumferential direction of the rotating shaft 11.

[0027] The housing 20 is formed in a cylindrical shape, and the stator 30 and rotor 40 are housed inside the housing 20. The housing 20 is provided with bearings 23 and 24, which rotatably support the rotating shaft 11. The axis of the inner surface of the housing 20 is coaxial with the rotating shaft 11. An angle sensor 12 is provided on the tip side of the rotating shaft 11. The angle sensor 12 may be a magnetic sensor or a resolver.

[0028] The stator 30 is cylindrical and positioned approximately in the axial center of the housing 20, along the inner circumference of the housing 20. The stator 30 is fixed to the inner surface of the housing 20 with respect to the axis O of the rotation shaft 11. The stator 30 constitutes part of the magnetic circuit and has a ring-shaped stator core 31 arranged radially opposite to the outer circumference of the rotor 40, and stator windings 32 wound around the stator core 31.

[0029] As shown in Figure 2, the stator core 31 has an annular back yoke 33 and a plurality of teeth 34 that protrude radially inward from the back yoke 33 and are arranged at predetermined distances in the circumferential direction, with slots 35 formed between adjacent teeth 34. In the stator core 31, the teeth 34 are provided at equal intervals in the circumferential direction, and the stator windings 32 are wound around these teeth 34. As a result, the conductors of the stator windings 32 are housed in each slot 35. In this embodiment, the number of teeth 34 and the number of slots 35 are both set to "18". For the sake of explanation, each tooth 34 is assigned the designation T1 to 18 in counterclockwise order in the circumferential arrangement, and when it is necessary to indicate the tooth number, the teeth 34 will also be referred to as teeth T1, T2, T3, etc. The stator windings 32 are held in a state housed in the slots 35, and magnetic flux is generated when power (AC power) is supplied.

[0030] The stator core 31 is formed by stacking multiple thin magnetic steel sheets (core sheets) in the axial direction of the stator core 31. The steel sheets may be formed, for example, by press-punching strip-shaped electrical steel sheets.

[0031] The rotor 40 constitutes part of the magnetic circuit, has multiple magnetic poles in the circumferential direction, and is positioned radially opposite to the stator 30. In this embodiment, the rotor 40 has 14 magnetic poles (i.e., 7 magnetic pole pairs). The rotor 40 comprises a rotor core 41 made of a magnetic material and permanent magnets 42 fixed to the rotor core 41. Specifically, as shown in Figure 2, the rotor 40 has 14 permanent magnets 42 as magnetic parts such that their polarity alternates in the circumferential direction, and the permanent magnets 42 are embedded in housing holes provided in the rotor core 41 along the axial direction.

[0032] The rotor 40 may have a well-known configuration, and may be, for example, an IPM (Interior Permanent Magnet) type rotor or an SPM (Surface Permanent Magnet) type rotor. Alternatively, a rotor on the field winding side may be used as the rotor 40. In this embodiment, an IPM type rotor is used. The rotating shaft 11 is inserted through the rotor 40 and fixed to the rotating shaft 11 so as to rotate integrally with the rotating shaft 11 around the rotating shaft 11.

[0033] A control device 50 is connected to the motor 10. The control device 50 is mainly composed of a microcomputer equipped with a CPU, ROM, RAM, and I / O, and various functions are realized by the CPU executing a program stored in the ROM. These various functions may be realized by hardware electronic circuits, or at least a part of them may be realized by software, i.e., processing executed on a computer.

[0034] The control device 50 has functions such as converting power from an external source (e.g., a battery) and supplying it to the motor 10 to generate driving force. In addition, the control device 50 has a function to control the motor 10 (such as current control) using information about the rotation angle input from the angle sensor 12.

[0035] Figure 3 shows the electrical configuration of the control device 50 in this embodiment.

[0036] In this 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 of the stator windings 32a and 32b. Each inverter circuit 51 and 52 is composed of a full-bridge circuit having the same number of upper and lower arms as the number of phases in the three-phase system. The control device 50 controls the current in each phase by turning on and off switching elements provided on each arm.

[0037] More specifically, the first inverter circuit 51 comprises three phases, U-phase, V-phase, and W-phase, each equipped with a series connection of an upper arm switch Sp and a lower arm switch Sn as switching elements. In this embodiment, voltage-controlled semiconductor switching elements are used as the upper arm switch Sp and lower arm switch Sn in each phase, specifically IGBTs are used. MOSFETs may also be used. Freewheeling diodes Dp and Dn are connected in antiparallel to the upper arm switch Sp and lower arm switch Sn in each phase, respectively.

[0038] The high-potential side terminal (collector) of each phase's upper arm switch Sp is connected to the positive terminal of the battery. The low-potential side terminal (emitter) of each phase's lower arm switch Sn is connected to the negative terminal (ground) of the battery. The intermediate connection point between each phase's upper arm switch Sp and lower arm switch Sn is connected to one end of the phase winding of each phase in the first stator winding 32a. The first stator winding 32a has U-phase, V-phase, and W-phase windings, and in the first inverter circuit 51, one end of each of these phase windings is connected to the intermediate connection point of the upper and lower arm switches Sp and Sn, respectively.

[0039] The second inverter circuit 52 has the same configuration as the first inverter circuit 51, so a detailed explanation is omitted here. The second stator winding 32b has X-phase, Y-phase, and Z-phase windings, and in the second inverter circuit 52, one end of each of these phase windings is connected to the intermediate connection point of the upper and lower arm switches Sp and Sn, respectively.

[0040] 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.

[0041] The configuration of the stator 30 is described in detail below. Figure 4 is a perspective view of the stator 30, and Figure 5 is a plan view of the stator 30. Figure 6 is a perspective view showing the configuration of the stator core 31. Note that the stator 30 shown in Figures 4 and 5 corresponds to the stator 30 shown in Figure 2.

[0042] In the stator 30, the stator core 31 is composed of a plurality of segmented cores 61, and the stator core 31 is formed in a cylindrical shape by arranging each segmented core 61 in a circumferential direction. Each segmented core 61 has teeth 34 (see Figure 9(a)), and as each segmented core 61 is arranged in a circumferential direction, the teeth 34 and slots 35 are arranged alternately in the circumferential direction, as shown in Figure 2. In this embodiment, the stator core 31 is composed of 18 segmented cores 61. The stator winding 32 is constructed by using round wire with a circular cross-section as the conductor material, and winding the conductor material around each tooth 34 by concentrated winding.

[0043] Figure 7 is a winding configuration diagram of the stator winding 32 in this embodiment. Figure 7(a) shows the configuration of the U-phase, V-phase, and W-phase windings in the first stator winding 32a, and Figure 7(b) shows the configuration of the X-phase, Y-phase, and Z-phase windings in the second stator winding 32b. In these stator windings 32a and 32b, the phase windings of each phase are connected to each other by a star connection (Y connection).

[0044] As shown in Figure 7(a), the first stator winding 32a has partial windings U1, U2, U3, and U4 as U-phase phase windings, partial windings V1, V2, V3, and V4 as V-phase phase windings, and partial windings W1, W2, W3, and W4 as W-phase phase windings. One end of the series connection of partial windings U1 and U2, one end of the series connection of partial windings V1 and V2, and one end of the series connection of partial windings W1 and W2 are connected to each other at the neutral point N1a, and one end of the series connection of partial windings U3 and U4, one end of the series connection of partial windings V3 and V4, and one end of the series connection of partial windings W3 and W4 are connected to each other at the neutral point N1b.

[0045] Furthermore, as shown in Figure 7(b), the second stator winding 32b has partial windings X1, X2, X3, and X4 as X-phase phase windings, partial windings Y1, Y2, Y3, and Y4 as Y-phase phase windings, and partial windings Z1, Z2, Z3, and Z4 as Z-phase phase windings. One end of the series connection of partial windings X1 and X2, one end of the series connection of partial windings Y1 and Y2, and one end of the series connection of partial windings Z1 and Z2 are connected to each other at the neutral point N2a, and one end of the series connection of partial windings X3 and X4, one end of the series connection of partial windings Y3 and Y4, and one end of the series connection of partial windings Z3 and Z4 are connected to each other at the neutral point N2b.

[0046] In addition, the four sub-windings for each phase winding in each stator winding 32a and 32b may be connected in a star configuration, rather than being divided into two pairs and connected in a star configuration as described above. In this case, the neutral points (N1a, N1b) in the first stator winding 32a are combined into one, and similarly, the neutral points (N2a, N2b) in the second stator winding 32b are also combined into one.

[0047] The partial windings U1-U4, V1-V4, and W1-W4 of each phase in the first stator winding 32a, and the partial windings X1-X4, Y1-Y4, and Z1-Z4 of each phase in the second stator winding 32b are each wound around the teeth 34 of the stator core 31 by concentrated winding. In this 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 point will be explained in detail below.

[0048] In the stator core 31, all 18 teeth 34 are divided into groups of three teeth, and each group of three teeth 34 has partial windings of two phase windings that are in different phases wound around it. In other words, in the stator 30, as shown in Figure 5, all the teeth 34 (T1~T18) of the stator core 31 are divided into six tooth groups G1~G6, and each tooth group G1~G6 has two partial windings from the first stator winding 32a (U1~U4, V1~V4, W1~W4) and two partial windings from the second stator winding 32b (X1~X4, Y1~Y4, Z1~Z4) wound around it. In this case, in each tooth group G1 to G6, a portion of the first stator winding 32a is wound around one of the teeth 34 on both sides in the circumferential direction, and a portion of the second stator winding 32b is wound around the other tooth 34. In addition, both portions of the first and second stator windings 32a and 32b are wound around the central tooth 34 of each tooth group G1 to G6.

[0049] Here, in each tooth group G1 to G6, if we consider the three consecutive teeth 34 in the circumferential direction as the first tooth, second tooth, and third tooth in circumferential order, then of these first to third teeth, the first and second teeth are continuously wound with a portion of the first phase winding from among the multiple phase windings, and the second and third teeth are continuously wound with a portion of the second phase winding from among the multiple phase windings. The second tooth, which is the center of the three consecutive teeth 34, is a common tooth on which both the first and second phase windings are wound. In this case, the "first phase winding" is one of the six phase windings in the first and second stator windings 32a and 32b, and the "second phase winding" is a different phase winding from the first phase winding among the six phase windings.

[0050] Figure 8 shows the correspondence between each partial winding of the stator windings 32a and 32b and each tooth T1 to T18. In Figure 8, for example, in tooth group G1, A partial winding W1 of the second stator winding 32b is wound around tooth T1. The teeth T2 are wound with a partial winding W2 of the second stator winding 32b and a partial winding X2 of the first stator winding 32a. A partial winding X1 of the first stator winding 32a is wound around tooth T3. These teeth T1 to T3 correspond to the first to third teeth. The other tooth groups G2 to G6 will not be explained, but each partial winding is wound in a similar manner, and the three teeth in each tooth group G2 to G6 correspond to the first to third teeth, respectively.

[0051] The winding structure of each partial winding in each tooth group will be described below. Before describing the winding structure of each partial winding, a more detailed description of the stator core 31 will be given.

[0052] Figure 9(a) is a perspective view of the segmented core 61, and Figure 9(b) is an exploded perspective view of the segmented core 61. The segmented core 61 has a core body 62 which is a laminate of steel plates, and insulating members 63 and 64 provided on one axial end and the other end (upper and lower sides in the figure) of the core body 62. The core body 62 has teeth 34 extending in the radial direction (radial direction in the stator core 31), a yoke portion 62a provided on one end, and a flange portion 62b provided on the other end. The yoke portion 62a corresponds to the back yoke 33 of the stator core 31 shown in Figure 2. When multiple segmented cores 61 are arranged in a circumferential direction, the yoke portions 62a of each segmented core 61 are connected to each other to form an annular back yoke 33. It is preferable that the yoke portions 62a of adjacent segmented cores 61 are joined together by adhesive or the like.

[0053] The insulating members 63 and 64 are made of an insulating resin material or the like and are attached to both axial ends of the teeth 34, respectively. The insulating member 63 has a cover portion 63a that fits over the axial end face (upper surface in the figure) of the teeth 34, and upright portions 63b and 63c provided on one radial end and the other end of the cover portion 63a, extending axially (upwards in the figure). The upright portion 63b is provided on the side of the yoke portion 62a in the radial direction, i.e., on the base end side of the teeth 34, and the upright portion 63c is provided on the side opposite the yoke portion in the radial direction, i.e., on the tip side of the teeth 34. The upright portion 63b has grooves 65a and 65b in two locations in the circumferential direction through which the conductor material of the partial winding can be inserted. The insulating member 64 similarly has a cover portion 64a and upright portions 64b and 64c.

[0054] The divided core 61 is constructed by attaching insulating members 63 and 64 to the core body 62, and by winding multiple layers of conductor material across each insulating member 63 and 64, a partial winding is wound around the teeth 34 of the divided core 61.

[0055] Figure 10 is a perspective view showing a partial winding wound around a single tooth group G, where (a) is a perspective view seen from the radially inner side and (b) is a perspective view seen from the radially outer side.

[0056] In Figures 10(a) and (b), in tooth group G, the three consecutive teeth 34 in the circumferential direction are designated as tooth A1 (first tooth), tooth A2 (second tooth), and tooth A3 (third tooth) in circumferential order. The first phase winding C1 is continuously wound around teeth A1 and A2, and the second phase winding C2 is continuously wound around teeth A2 and A3. Of teeth A1 to A3, the central tooth A2 is a common tooth around which both the first and second phase windings C1 and C2 are wound. Note that tooth group G shown in Figures 10(a) and (b) is, for example, tooth group G1 shown in Figures 2 and 8, where tooth T1 corresponds to "tooth A3", tooth T2 to "tooth A2", and tooth T3 to "tooth A1". In other words, in Figures 10(a) and (b), partial windings X1 and X2 are wound around teeth A1 and A2 as the first phase winding C1, and partial windings W1 and W2 are wound around teeth A2 and A3 as the second phase winding C2. Of the two phase windings C1 and C2, the first phase winding C1 is the pre-winding winding, which is wound first during the winding process, and the second phase winding C2 is the post-winding winding, which is wound later.

[0057] In the first phase winding C1, which is a pre-wound winding, the conductor material is wound in the order of teeth A1 → teeth A2 during the winding process. At each of these teeth A1 and A2, the conductor material is wound in opposite circumferential directions. In Figure 10(a), the conductor material is wound counterclockwise around tooth A1 with a number of turns Na, and then the conductor material is wound clockwise around tooth A2 with a number of turns Nb. In addition, in the first phase winding C1, the conductor end at the beginning of the winding and the conductor end at the end of the winding are pulled out in the axial direction, forming pull-out sections H11 and H12 that extend from the divided core 61 for a predetermined length.

[0058] The lead-out portion H11 on the winding start side is pulled out from the base end side (back yoke 33 side) of tooth A1, and the lead-out portion H12 on the winding end side is pulled out from the base end side (back yoke 33 side) of tooth A2. In this case, in particular, grooves 65a, 65b are provided in the upright portion 63b of the insulating member 63 in each divided core 61, and the lead-out portion H11 is pulled out while inserted into the groove 65a of the insulating member 63 corresponding to tooth A1. Similarly, the lead-out portion H12 is pulled out while inserted into the groove 65a of the insulating member 63 corresponding to tooth A2.

[0059] Furthermore, in the first phase winding C1, the section between the partial winding X1 wound around tooth A1 and the partial winding X2 wound around tooth A2 is a connecting section H13 that spans between these teeth A1 and A2, and this connecting section H13 is guided to the outside of the upright section 63b of the insulating member 63. Specifically, the connecting section H13 is a conductor material in the section from the end position of the tooth winding of partial winding X1 to the start position of the tooth winding of partial winding X2, and the connecting section H13 is pulled out to the outside of the upright section 63b between the groove section 65b on the tooth A1 side and the groove section 65b on the tooth A2 side. As shown in Figure 10(b), a guide groove 65c is provided on the outer surface of the upright section 63b, and the connecting section H13 is guided while incorporated into the guide groove 65c.

[0060] On the other hand, in the second phase winding C2, which is a post-winding winding, the conductor material is wound in the order of teeth A3 → teeth A2 during the winding process. Comparing the first and second phase windings C1 and C2, in each of these phase windings C1 and C2, the winding process is carried out in the circumferential direction in opposite orders, from one adjacent tooth to the other. In other words, in the first phase winding C1, which is a pre-winding winding, the partial windings X1 and X2 are wound in a manner that progresses from left to right in Figure 10(a), whereas in the second phase winding C2, which is a post-winding winding, the partial windings W1 and W2 are wound in a manner that progresses from right to left in Figure 10(a).

[0061] In each tooth A2 and A3, the conductor material is wound in opposite circumferential directions. In Figure 10(a), the conductor material is wound counterclockwise around tooth A3 with a number of turns Na, and then wound clockwise around tooth A2 with a number of turns Nb. In the second phase winding C2, the conductor end on the winding start side and the conductor end on the winding end side are pulled out axially, forming lead-out sections H21 and H22 that extend from the divided core 61 for a predetermined length.

[0062] The lead-out portion H21 on the winding start side is pulled out from the base end side (back yoke 33 side) of tooth A3, and the lead-out portion H22 on the winding end side is pulled out from the base end side (back yoke 33 side) of tooth A2. In this case in particular, the lead-out portion H21 is pulled out while inserted into the groove 65a of the insulating member 63 corresponding to tooth A3. Similarly, the lead-out portion H22 is pulled out while inserted into the groove 65b of the insulating member 63 corresponding to tooth A2.

[0063] Furthermore, in the second phase winding C2, the section W1 wound around tooth A3 and the section W2 wound around tooth A2 are connected by a connecting section H23 that spans between teeth A2 and A3. Unlike the connecting section H13 of the first phase winding C1, this connecting section H23 is not guided outside the upright portion 63b of the insulating member 63, but is directly spanned from tooth A3 to tooth A2.

[0064] According to the above configuration, the two lead-outs H11 and H12 of the first phase winding C1 and the two lead-outs H21 and H22 of the second phase winding C2 are arranged so as to be aligned circumferentially at the same radial position (i.e., at the base end of each tooth). Each tooth group G1 to G6 shown in Figure 2 etc. has a similar winding structure.

[0065] As described above, in the first-phase winding C1, the number of turns of the partial winding around the tooth A1 is "Na", and the number of turns of the partial winding around the tooth A2 is "Nb". Also, in the second-phase winding C2, the number of turns of the partial winding around the tooth A3 is "Na", and the number of turns of the partial winding around the tooth A2 is "Nb". The relationship between these numbers of turns is Na / 2 < Nb. That is, in the present embodiment, among the three consecutive teeth A1 to A3 in the circumferential direction, for the teeth A1 and A3 at both ends, the number of turns is "Na" respectively, and for the central tooth A2, the number of turns 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.

[0066] In this case, since the amount of conductor of the central tooth A2 (common tooth) among the three consecutive teeth A1 to A3 is larger than that of the teeth A1 and A3 at both ends, there is a concern that winding disorder may occur when winding the conductor around the common tooth. In this regard, in the present embodiment, the lead-out position of the conductor end of each phase winding is defined, the crossing portion H13 of the first-phase winding C1 (front-wound winding) is guided by the upright portion 63b of the insulating member 63, and the conductor end is held by the groove portion 65a of the insulating member 63, so that the inconvenience caused by the winding disorder of the conductor is suppressed.

[0067] As described above, in the winding structure in which a plurality of windings are wound around the same tooth of the stator core 31, the terminal processing of each winding (terminal processing at the coil end) becomes complicated, and there is a concern that the start end and the end end of the front-wound winding may interfere when the rear-wound winding is wound. In the present embodiment, the winding structure is improved to address such inconveniences, and the details will be described below.

[0068] Figure 11 shows the winding order of the conductor material at tooth A2, the central tooth of tooth group G. Here, the portion of the first phase winding C1 wound around tooth A2 is referred to as the first winding 101, and the portion of the second phase winding C2 wound around tooth A2 is referred to as the second winding 102. For the sake of explanation, the first winding 101 is shown with a single circle, and the second winding 102 is shown with a double circle. In Figure 10(a), the numbers attached to each winding 101 and 102 indicate the winding order, with each winding 101 and 102 starting at number 1 and ending at number 8, respectively. However, the number of turns is not limited to these. The left and right sides of the figure represent the circumferential direction. The top and bottom of the figure represent the radial direction, and the upper side of the figure is the back yoke 33 side, i.e., the radially outward side (outer diameter side). Figure 11(b) shows the state in which the first winding 101 is wound around tooth A2 (tooth 34), and Figure 11(c) shows the state in which the second winding 102 is wound after the first winding 101 has been wound.

[0069] As shown in Figure 11, the first winding 101 is wound around the teeth 34 in a first range R1 from the end on the back yoke 33 side (first end 34a) to the radial midpoint, with the conductor material overlapping in multiple layers. In this case, the first winding 101 is wound with the first end 34a of the teeth 34 as the starting position (single circle 1) and the position overlapping the conductor material at the starting position as the ending position (single circle 8). As a result, the first winding 101 is positioned towards one radial side of the teeth 34, and the ends of the conductor material in the first winding 101 (starting end and ending end) are concentrated towards the first end of the teeth 34.

[0070] Furthermore, the second winding 102 starts winding at a position closer to the radial center of the teeth 34 than the starting position of the first winding 101 (double circle 1), and is wound from that starting position toward the center of the teeth, with a portion overlapping the first winding 101. In other words, the second winding 102 is wound in a second range R2 on the teeth 34 from the end on the side opposite the back yoke (second end 34b) to the position where it overlaps with the first winding 101. By starting the winding on the first end 34a side and folding back at the second end 34b, the conductor material is wound around the teeth 34 in multiple layers.

[0071] Here, the first winding 101 and the second winding 102 are wound around the teeth 34 in a staggered arrangement of round wire material, and the second winding 102 is wound starting from a position one turn's worth of wire material space away from the first end. Furthermore, comparing the radially inner and radially outer sides, the radially outer side (back yoke 33 side) has a larger number of wire turns. However, it is also possible to have the same number of wire turns on both the radially inner and radially outer sides.

[0072] With the above configuration, the starting and ending ends of the first winding 101 are concentrated on the first end side of the teeth 34, thereby suppressing the inconvenience of the starting and ending ends of the first winding 101 getting in the way when the second winding 102 is wound.

[0073] Figure 12 is a perspective view showing the winding structure in tooth A2. As shown in Figure 12, the first winding 101 is wound with the connecting portion H13 and the leading portion H12 held by the grooves 65a and 65b of the insulating member 63, respectively. The second winding 102 is wound so as to overlap the first winding 101. In this case, the grooves 65a and 65b of the insulating member 63 correspond to the holding portions that hold the connecting portion H13 and the leading portion H12 of the first winding 101.

[0074] The following describes the busbar module 70, which is assembled to one axial end of the stator 30. Figure 13 is a perspective view of the busbar module 70.

[0075] The busbar module 70 has a plurality of busbars 71 and a busbar holder 72 that holds each of 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 neutral point busbar 74. The busbars 73 for each phase are conductive members that connect the partial windings of the same phase to each other, and the busbar 74 for the neutral point is a conductive member that connects the partial windings of each phase by a star connection. In this embodiment, six busbars are provided as the busbars 73 for each phase: 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, and two busbars are provided as the neutral point busbars 74: a neutral point busbar for the first stator winding 32a and a neutral point busbar for the second stator winding 32b. In this example, we are illustrating a configuration in which each stator winding 32a and 32b has one neutral point.

[0076] Figure 14(a) is a perspective view showing the configuration of one busbar 73 for each phase. Each phase busbar 73 is arc-shaped overall, with radially extending arm portions 73a at both ends, and winding connection portions 73b connected to the phase windings of each phase at the tip of each arm portion 73a. Power terminal portions 73c for power input and output are also provided on the arc portion for each phase. As shown in Figure 13, the radial length of the arm portion 73a and the circumferential position of the power terminal portion 73c differ for each phase busbar 73.

[0077] Figure 14(b) is a perspective view showing the configuration of a single busbar 74 for the neutral point. The busbar 74 for the neutral point is arc-shaped overall, and has radially extending arm portions 74a at multiple locations (six locations in this embodiment) along its longitudinal direction. At the tip of each arm portion 74a, there is a neutral point connection portion 74b that is connected to the neutral point end of the phase winding of each phase.

[0078] Figure 15 is a perspective view showing the configuration of the busbar holder 72. The busbar holder 72 is made of, for example, an insulating resin material and is formed in an annular shape. The busbar holder 72 has a plurality of grooves 72a that extend in an arc shape in the circumferential direction. These plurality of grooves 72a are formed in multiple layers radially inward and outward, and each busbar 73, 74 is assembled into each groove 72a such that the busbar plate surfaces face each other radially. In addition, a plurality of protrusions 72b are provided on the upper surface of the busbar holder 72. These protrusions 72b are support parts that support the arm portions 73a, 74a of each busbar 73, 74, and are provided distributed in the circumferential direction according to the position of each arm portion 73a, 74a.

[0079] Multiple through holes 72c are provided on the outer edge of the busbar holder 72, i.e., radially outward from each groove 72a, that penetrate in the axial direction (up and down direction in the figure). These through holes 72c are insertion holes through which the lead-out portions, which are the wire ends of each phase winding, i.e., the lead-out portions H11, H12, H21, and H22 shown in Figure 10(a), etc., are inserted. In this embodiment, the through holes 72c, which are the wire connection portions in the busbar module 70, are concentrated on the outer edge of the busbar holder 72. The busbar holder 72 is also provided with multiple assembly portions 72d for assembling the busbar module 70 to the stator core 31.

[0080] Figure 16 is a perspective view showing the busbar module 70 assembled on the stator 30. In Figure 16, the busbar module 70 is assembled coaxially with the stator core 31 on one axial end of the stator core 31.

[0081] The lead-out ends of each phase winding are inserted through the through-holes 72c of the busbar holder 72 and connected to the respective busbars 73 and 74 on the upper surface of the busbar holder 72. Specifically, the lead-out ends of each phase winding and the connection portions 73b and 74b of the respective busbars 73 and 74 are joined by welding or the like. This ensures that the phase windings of each phase are connected to each other in the desired configuration in each stator winding 32a and 32b. In addition, power lines 75 are connected to the power terminal portions 73c of each phase busbar 73.

[0082] Incidentally, noise and vibration due to torque ripple are problematic in rotating electric machines. Since torque ripple mainly consists of 6th harmonic or 12th harmonic components, it is desirable to suppress these. Therefore, it is preferable to use the motor 10 with the above configuration and perform the following control in the control device 50.

[0083] In the motor 10 with the above configuration, The first teeth (T3, T6, T9, T12, T15, T18) of each tooth group are wound with the U-phase, V-phase, and W-phase partial windings (first coil body) of the first stator winding 32a. • On the second teeth (T2, T5, T8, T10, T14, T17) of each tooth group, a partial winding (second coil body) of either one phase from the first and second stator windings 32a and 32b is wound. The third teeth (T1, T4, T7, T10, T13, T16) of each tooth group are wound with the X-phase, Y-phase, and Z-phase partial windings (third coil body) of the second stator winding 32b.

[0084] In this configuration, the control device 50 sets the combined phase difference between the magnetomotive force generated by the partial winding of the first stator winding 32a wound around the second teeth and the magnetomotive force generated by the partial winding of the second stator winding 32b wound around the second teeth, such that the phase difference between the magnetomotive force of the second coil body of each phase and the phase difference between the magnetomotive force of the third coil body of each phase and the magnetomotive force generated by the second coil body of each phase are within a predetermined phase range including 20 degrees in electrical angle, or the phase difference between the magnetomotive force of the third coil body of each phase and the magnetomotive force generated by the partial winding of the second coil body of each phase and the magnetomotive force generated by the partial winding of the second stator winding 32b wound around the second teeth are within a predetermined phase range including 20 degrees in electrical angle. Alternatively, the control device 50 sets the combined 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. Details of this control are described in detail in Japanese Patent No. 7103299 filed by the applicant of this application.

[0085] According to the embodiment described in detail above, the following excellent effects can be obtained.

[0086] In a configuration where a first winding 101 and a second winding 102, which are in different phases, are wound as stator windings 32 on the same teeth 34 of the stator core 31, there is a concern that the termination of each winding 101 and 102 (termination at the coil end) will become complicated. Furthermore, there is a concern that the starting and ending ends of the first winding 101, which is wound first, will interfere with the winding of the second winding 102, which is wound later. In this regard, by winding the first winding 101 with multiple layers of conductor material around the teeth 34 in a first range R1 from the first end 34a of the teeth 34 to the radial intermediate position, the first winding 101 can be positioned towards one radial side of the teeth 34, and consequently, the ends of the conductor material in the first winding 101 (the starting end and ending end) can be suitably concentrated towards the first end 34a of the teeth 34. This prevents the inconvenience of the starting and ending ends of the first winding 101 interfering with the winding of the second winding 102. Furthermore, by winding the second winding 102 in the second range R2 from the second end 34b of the tooth 34 to the position where it overlaps with the first winding 101, the second winding 102 can be wound closer to the first end 34a while overlapping the first winding 101, using the empty area on the tooth 34 where the first winding 101 is not wound. This allows the end of the conductor material of the second winding 102 to be brought closer to the first end 34a. As a result, the first winding 101 and the second winding 102 can be suitably wound on the same tooth.

[0087] Since the first winding 101 is wound with the first end 34a of the teeth 34 as the starting position and the winding end position overlapping the conductor material at the starting position, a suitable configuration can be achieved for positioning the first winding 101 towards one radial side of the teeth 34. Furthermore, since the starting position of the second winding 102 is set to be closer to the center of the teeth between the radial ends of the teeth 34 than the starting position of the first winding 101, and the winding is performed toward the center of the teeth, the second winding 102 can be wound suitably while avoiding interference with the end of the first winding 101.

[0088] In a configuration using round wire as the conductor material, the space utilization can be improved by winding the first winding 101 and the second winding 102 in a staggered arrangement. Furthermore, with the staggered arrangement structure of round wire, it is relatively easy to shift the radial position of the starting position of the second winding, and it is easy to realize a configuration in which the starting position of the second winding 102 is separated from the first end 43a by one turn of the conductor material. This makes it possible to suitably avoid interference between the second winding and the end of the first winding.

[0089] Furthermore, the second winding 102 is configured to begin winding on the first end 34a side of the teeth 34 and be folded back at the second end 34b, thereby winding the conductor material in multiple layers around the teeth 34. This allows the beginning and end of the winding of the conductor material of the second winding 102 to be concentrated on the first end 34a side of the teeth 34, similar to the first winding 101. Therefore, the workability of terminal processing when connecting multiple first windings 101 that constitute the stator winding 32, multiple second windings 102 that connect to each other, or when connecting the first winding 101 and the second winding 102 can be improved.

[0090] In the stator core 31, the first phase winding C1 is continuously wound around the first and second teeth, and the second phase winding C2 is continuously wound around the second and third teeth, out of the three circumferentially continuous first to third teeth. In this configuration, one end and the other end of the first phase winding C1 are drawn out from the back yoke 33 side ends of the radial ends of the first and second teeth, respectively, while one end and the other end of the second phase winding C2 are drawn out from the back yoke 33 side ends of the radial ends of the third and second teeth, respectively (see Figures 10(a) and (b)). This allows for convenient connection of the conductor ends to the power supply side and the neutral point connection of each phase winding, while maintaining the three teeth 34 as a set. Furthermore, the first phase winding C1, which is a pre-wound winding, is connected between the first and second teeth by a connecting portion H13 that extends circumferentially along the back yoke 33. As a result, all of the multiple wire ends generated at each tooth are processed on the back yoke 33 side.

[0091] In a configuration where the first phase winding C1 is continuously wound around adjacent first teeth A1 and second teeth A2 in the circumferential direction, the connecting portion H13 extending from the first tooth A1 side becomes the starting end of the first winding 101 wound around the second tooth A2, and the opposite side becomes the ending end. In this case, the upright portion 63b provided on the back yoke 33 side of the insulating members 63 and 64 is used to hold the starting end (connecting portion H13) and ending end of the first winding 101. This allows the starting end and ending end of the first winding 101 to be held on the back yoke 33 side while conveniently avoiding interference during the winding of the second winding 102.

[0092] (Other embodiments) The above embodiment may be modified as follows, for example.

[0093] In a configuration where the first winding 101 is wound in a first range R1 from the first end 34a to the radial intermediate position at the central tooth A2 (tooth 34) of tooth group G, there is a concern that the first winding 101 may collapse during the winding process. Therefore, the following configuration may be used to suppress the collapse of the first winding 101.

[0094] As shown in Figure 17, the teeth 34 may be provided with a projection 81 at the boundary position on the side opposite the first end in the first range R1 around which the first winding 101 is wound, perpendicular to the radial direction and extending away from the tooth surface. In other words, the projection 81 is provided at the position that forms the boundary between the first winding 101 and the second winding 102 in the radial direction. The projection 81 may be integrally molded with, for example, the insulating members 63, 64 and provided to extend from the tooth surface side in at least one of the axial and circumferential directions. However, the projection 81 may also be formed from an electrical steel sheet on the teeth 34. With the above configuration, even if the first winding 101 is wound in the first range R1 from the first end 34a of the teeth 34 to an intermediate position in the radial direction, the unwinding of the first winding 101 can be suitably suppressed.

[0095] Furthermore, in the configuration shown in Figures 18(a) and (b), the insulating members 63 and 64 are provided with stepped portions 82 in the covering portions 63a and 64a that are placed over the axial end faces of the teeth 34, to differentiate the axial thickness dimensions between the first range R1 and the areas outside the first range R1. In this case, the first range R1 is the winding range of the first winding 101 on the teeth 34, and the axial thickness dimension of the covering portions 63a and 64a is smaller within this first range R1. In relation to the axial end faces of the coil side CS in the divided core 61, the height dimension from the axial end face of the coil side CS is smaller in the first range R1 than in the areas outside the first range. In the covering portions 63a and 64a, the area within the first range R1 corresponds to the "first insulating portion," and the area outside the first range R1 corresponds to the "second insulating portion."

[0096] In the above configuration, by forming a stepped structure in the divided core 61 between the first range R1 where the first winding 101 is wound and the area outside the first range, it is possible to suppress the unwinding of the first winding 101. Furthermore, considering that in the teeth 34, both the first winding 101 and the second winding 102 are wound in a stacked state in the first range R1, and only the second winding 102 is wound in the area outside the first range R1, it is possible to suppress the axial length dimension from becoming excessively large in the first range R1 compared to other areas, and to equalize the winding axial length dimension in the radial direction of the teeth 34.

[0097] Alternatively, instead of providing the stepped portion 82 on each insulating member 63, 64 on both sides in the axial direction, it is also possible to provide the stepped portion 82 on either one of the insulating members 63, 64 on either side in the axial direction.

[0098] Furthermore, as shown in Figure 19(a), the portion of the insulating member 63 covering portion 63a corresponding to the first range R1 may be made into an inclined portion 83 that becomes lower towards the back yoke 33 side (right side in the figure). In this case, the first winding 101 can be wound while being close to the upright portion 63b on the back yoke 33 side, and the unraveling of the first winding 101 can be suppressed.

[0099] As shown in Figure 19(b), it is also possible to make the entire area around which the first winding 101 and the second winding 102 are wound in the covering portion 63a of the insulating member 63 a sloping portion 83 that becomes lower towards the back yoke 33 side (right side in the figure). Furthermore, in the configurations of Figures 18(a) and (b), and Figures 19(a) and (b), it is also possible to combine a configuration in which a projection 81 is provided at the boundary position of the first range R1 as shown in Figure 17. For example, it is preferable that the projection 81 is provided on the circumferential side surface of the insulating members 63 and 64 in the circumferential direction.

[0100] In the stator winding 32, a conductor material consisting of multiple wires arranged in parallel may be used as the conductor material, and this conductor material may be wound around the teeth. In this case, the thinning of the conductor material can suppress the unwinding of the first winding 101.

[0101] In the above embodiment, the first phase winding C1, which is the pre-winding winding, is configured to wind the partial winding in the order of first tooth → second tooth. However, this may be changed to wind the partial winding in the order of second tooth → first tooth. Also, in the above embodiment, the second phase winding C2, which is the post-winding winding, is configured to wind the partial winding in the order of third tooth → second tooth. However, this may be changed to wind the partial winding in the order of second tooth → third tooth.

[0102] In the above embodiment, as shown in Figure 7(a), the first stator winding 32a is configured such that the partial windings U1~U4, V1~V4, and W1~W4 of each phase are divided into two and connected by a star configuration. However, this configuration may be changed. For example, as shown in Figure 20(a), the partial windings U1~U4, V1~V4, and W1~W4 of each phase may be connected in series, and these three-phase series connections may be connected by a star configuration. Similarly, for the second stator winding 32b, as shown in Figure 20(b), the partial windings X1~X4, Y1~Y4, and Z1~Z4 of each phase may be connected in series, and these three-phase series connections may be connected by a star configuration.

[0103] In each stator winding 32a and 32b, it is also possible to connect the phase windings of each phase using a delta connection instead of a star connection (Y connection).

[0104] In the stator core 31, each segmented core 61 may have multiple teeth 34. For example, a segmented core 61 may have three teeth 34. Alternatively, the stator core 31 may have a configuration that is not a segmented core structure, i.e., a single, indivisible annular structure in the circumferential direction.

[0105] The number of teeth of the stator core 31 may be other than 18. However, in this case, the number of teeth should preferably be 3 × n.

[0106] In the above embodiment, the stator winding 32 has a configuration having a first stator winding 32a and a second stator winding 32b, for a total of 6 phase windings. However, this can be changed, and the stator winding 32 may have a configuration having a set of 3 phase windings.

[0107] The rotating electric machine may be an outer rotor type instead of an inner rotor type. In an outer rotor type rotating electric machine, the back yoke 33 is radially inward in the stator core 31, and teeth 34 are provided so as to extend radially outward from the back yoke 33. In this case, it is preferable to concentrate the starting and ending ends of the first winding 101 and the starting and ending ends of the second winding 102 on the radially inward base end side (back yoke 33 side) of the teeth 34.

[0108] The technical concepts extracted from the above-described embodiments are described below. [Configuration 1] A stator core (31) having an annular back yoke (33) and a plurality of teeth (34) extending radially from the back yoke and provided at predetermined intervals in the circumferential direction, A stator (30) having a multiphase stator winding (32) in which a conductor material is wound around the teeth by concentrated winding, A predetermined tooth among the plurality of teeth has a first winding (101) and a second winding (102) that are in different phases from each other wound around it as the stator winding, wherein the first winding is the winding that was wound around the tooth first, and the second winding is the winding that was wound around the tooth later. In the teeth around which the first winding and the second winding are wound, the first winding is wound around the teeth in a first range from the first end on one radial side to an intermediate radial position, with the conductor material overlapping in multiple layers, and the second winding is wound around the teeth in a second range from the second end on the other radial side to a position overlapping with the first winding. A stator in which the first winding is wound with the starting and ending ends of the conductor material positioned towards the first end, and the second winding is wound such that a portion of it overlaps the first winding. [Configuration 2] The first winding is wound with the first end as the starting position and the position overlapping the conductor material at the starting position as the ending position. The stator according to configuration 1, wherein the second winding starts at a position closer to the center of the teeth between the radial ends of the teeth than the starting position of the first winding, and is wound from that starting position toward the center of the teeth. [Configuration 3] The aforementioned conductor material is a round wire with a circular cross-section, and the first winding and the second winding are wound around the teeth in a staggered arrangement of the conductor material. The stator according to configuration 2, wherein the second winding is wound starting from a position that is one turn's worth of space away from the first end. [Structure 4] The stator according to configuration 2 or 3, wherein the second winding is wound around the teeth in multiple layers, starting from the first end and folding back at the second end. [Composition 5] The stator according to any one of configurations 1 to 4, wherein the teeth are provided with projections (81) that are perpendicular to the radial direction and extend away from the surface of the teeth at the boundary position on the side opposite the first end in the first range around which the first winding is wound. [Composition 6] The teeth are fitted with insulating members (63, 64) at their axial ends, and the first winding and the second winding are wound around the teeth with the insulating members interposed between them. The stator according to any one of configurations 1 to 5, wherein the insulating member has a first insulating portion which corresponds to the first range in the radial direction and a second insulating portion which is a portion outside the first range, and the first insulating portion has a smaller axial thickness than the second insulating portion. [Composition 7] The stator winding has a plurality of phase windings provided for each phase, and each of the phase windings is wound around the teeth by concentrated winding. In the stator core, when the teeth that are circumferentially continuous in three directions are designated as the first tooth, second tooth, and third tooth, the first phase winding (C1) of the plurality of phase windings is continuously wound around the first tooth and the second tooth, and the second phase winding (C2) of the plurality of phase windings is continuously wound around the second tooth and the third tooth, and the second tooth is a tooth around which both the first and second windings are wound. One end and the other end of the first phase winding are each drawn out from the ends on the back yoke side of the radial ends of the first teeth and the second teeth, respectively. One end and the other end of the second phase winding are drawn out from the ends on the back yoke side of the radial ends of the third teeth and the second teeth, respectively. A stator according to any one of configurations 1 to 6, wherein of the first phase winding and the second phase winding, the first phase winding is a pre-winding winding that is wound first during winding, and the second phase winding is a post-winding winding that is wound later, and the first phase winding is continuous between the first teeth and the second teeth by a connecting portion (H13) that extends circumferentially along the back yoke. [Structure 8] An insulating member (63) is provided at the axial end of the stator core to insulate the teeth from the stator windings. The insulating member has an upright portion (63b) that extends axially on the back yoke side of the teeth, The stator according to configuration 7, wherein the upright portion is provided with holding portions (65a, 65b) that hold the connecting portion, which is one of the starting and ending ends of the first winding wound around the second teeth, and the other end. [Explanation of Symbols]

[0109] 30...stator, 31...stator core, 32...stator winding, 33...back yoke, 34...teeth, 101...first winding, 102...second winding.

Claims

1. A stator core (31) having an annular back yoke (33) and a plurality of teeth (34) extending radially from the back yoke and provided at predetermined intervals in the circumferential direction, A stator (30) having a multiphase stator winding (32) in which a conductor material is wound around the teeth by concentrated winding, A first winding (101) and a second winding (102), which are in different phases from each other, are wound around a predetermined tooth among the plurality of teeth, as the stator winding, wherein the first winding is the winding wound around the tooth first, and the second winding is the winding wound around the tooth later. In the teeth around which the first winding and the second winding are wound, the first winding is wound around the teeth in a first range from the first end on one radial side to an intermediate radial position, with the conductor material overlapping in multiple layers, and the second winding is wound around the teeth in a second range from the second end on the other radial side to a position overlapping with the first winding. A stator in which the first winding is wound with the starting and ending ends of the conductor material positioned towards the first end, and the second winding is wound such that a portion of it overlaps the first winding.

2. The first winding is wound with the first end as the starting position and the position overlapping the conductor material at the starting position as the ending position. The stator according to claim 1, wherein the second winding has a winding start position closer to the center of the teeth between the radial ends of the teeth than the winding start position of the first winding, and is wound from that winding start position toward the center of the teeth.

3. The aforementioned conductor material is a round wire with a circular cross-section, and the first winding and the second winding are wound around the teeth in a staggered arrangement of the conductor material. The stator according to claim 2, wherein the second winding is wound starting from a position that is spaced one turn's worth of the conductor material away from the first end.

4. The stator according to claim 2, wherein the second winding is wound around the teeth in multiple layers, with the first end being the starting point for winding and the second end being folded back.

5. The stator according to claim 1, wherein the teeth are provided with projections (81) that are perpendicular to the radial direction and extend away from the surface of the teeth at the boundary position on the side opposite the first end in the first range around which the first winding is wound.

6. Insulating members (63, 64) are attached to the axial ends of the teeth, and the first winding and the second winding are wound around the teeth with the insulating members interposed between them. The stator according to claim 1, wherein the insulating member has a first insulating portion which corresponds to the first range in the radial direction and a second insulating portion which is a portion outside the first range, and the first insulating portion has a smaller axial thickness than the second insulating portion.

7. The stator winding has a plurality of phase windings provided for each phase, and each of the phase windings is wound around the teeth by concentrated winding. In the stator core, when the teeth that are circumferentially continuous in three directions are designated as the first tooth, second tooth, and third tooth, the first phase winding (C1) of the plurality of phase windings is continuously wound around the first tooth and the second tooth, and the second phase winding (C2) of the plurality of phase windings is continuously wound around the second tooth and the third tooth, and the second tooth is a tooth around which both the first and second windings are wound. One end and the other end of the first phase winding are each drawn out from the ends on the back yoke side of the radial ends of the first teeth and the second teeth, respectively. One end and the other end of the second phase winding are drawn out from the ends on the back yoke side of the radial ends of the third teeth and the second teeth, respectively. The stator according to any one of claims 1 to 6, wherein of the first phase winding and the second phase winding, the first phase winding is a pre-winding winding that is wound first during winding, and the second phase winding is a post-winding winding that is wound later, and the first phase winding is continuous between the first teeth and the second teeth by a connecting portion (H13) that extends circumferentially along the back yoke.

8. An insulating member (63) is provided at the axial end of the stator core to insulate the teeth from the stator windings. The insulating member has an upright portion (63b) that extends axially on the back yoke side of the teeth, The stator according to claim 7, wherein the upright portion is provided with holding portions (65a, 65b) that hold the connecting portion, which is one of the starting and ending ends of the first winding wound around the second teeth, and the other end.

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