Motor

Abstract

To provide a motor capable of preventing a winding collapse.SOLUTION: A stator 3 constituting a motor together with a rotor includes: a stator core having a plurality of teeth 42; and a plurality of windings 60A and 60B. Each winding includes: a plurality of coil parts 61 and 62 wound around the tooth; two lead wire parts 64 that constitute an end part of each winding and extend from the coil parts; and a crossover wire part 63 that connects the adjacent coil parts. Each winding includes: a forward winding 60A including a plurality of forward coil parts 61; and a reverse winding 60B including a plurality of reverse coil parts 62. In each of the forward winding and the reverse winding, in the coil part in which the lead wire part is drawn from one side in the circumferential direction, the crossover wire part is drawn from the other side in the circumferential direction, and the crossover wire part that is drawn from the other side in the circumferential direction of the coil part extends to the other side in the circumferential direction with respect to the coil part.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a motor. [Background technology]

[0002] Patent Document 1 discloses a stator (armature) for a motor (electric motor) that includes a stator core, a winding, and an insulator. The stator core has multiple slots and multiple teeth formed between the slots. The winding is made of a single wire (solid wire) or a multi-filament wire formed by bundling multiple wires in a non-aligned manner. The winding has multiple coil portions wound around each of the multiple teeth, connection portions (crossover portions) that connect the coils, and two lead wire portions that extend from the coil portions at both ends and form the ends of the winding. The crossover portions are housed in crossover grooves that extend circumferentially on the outer periphery of the insulator. A three-phase AC motor has windings for three phases. The crossover wires of the three phases (U, V, and W) are housed in three crossover grooves aligned in the axial direction of the insulator to electrically insulate the windings of different phases from each other. To electrically insulate the windings of different phases from each other, it is necessary to ensure a sufficient creepage distance between the crossover wires housed in different crossover grooves. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2012 / 133302 Summary of the Invention [Problem to be solved by the invention]

[0004] Depending on the manner in which the windings are attached to the stator core and the insulator, the crossover wires and lead wires constituting the same winding may cross each other.Furthermore, the crossover wires constituting the same winding may cross each other at the crossover grooves. Furthermore, in a three-phase AC motor, when the ratio of the number of poles P of the rotor to the number of slots S of the stator core is 5:6 or 7:6, the multiple coil sections in the winding for each phase include forward coil sections wound in a specific direction and reverse coil sections wound in the opposite direction to the forward coil sections. In conventional motors, each phase's winding, including these forward coil sections and reverse coil sections, is composed of a single winding. This also results in crossing of the crossover wire sections and lead wire sections that make up the same winding, and crossing of the crossover wire sections at the crossover grooves.

[0005] However, when a specific crossover wire portion crosses a lead wire portion or another crossover wire portion in the same winding, the specific crossover wire portion may overflow the crossover groove or enter a crossover groove containing a crossover wire portion of another phase, causing the winding to collapse.

[0006] The present disclosure has been made in consideration of such problems, and has an object to provide a motor that can prevent the windings from becoming unwound. [Means for solving the problem]

[0007] A motor according to one aspect of the present disclosure includes a stator including an annular stator core having a plurality of teeth and a plurality of slots aligned in a circumferential direction with a rotor, and a plurality of windings wound around the plurality of teeth, wherein when the number of poles of the rotor is P, the number of slots of the stator core is S, and m is a natural number, P:S=5×2m:6×2m, or P:S=7×2m:6×2m the coil sections include a forward coil section and a reverse coil section wound in the opposite direction to the forward coil section, and the winding includes a forward winding including a plurality of the forward coil sections and a reverse winding including a plurality of the reverse coil sections, and in each of the forward winding and the reverse winding, the coil section from which the pull-out sections are drawn out from one side in the circumferential direction has the crossover section drawn out from the other side in the circumferential direction, and the crossover section drawn out from the other side in the circumferential direction of the coil sections extends to the other side in the circumferential direction relative to the coil sections. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to prevent the windings in a motor from becoming unwound. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view schematically illustrating a motor according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view showing an example of a stator having 36 slots in the motor of FIG. 1. [Figure 3] FIG. 2 is a cross-sectional view of an example of the motor of FIG. 1, when viewed from the axial direction, in which the rotor has 10 poles and the stator has 12 slots. [Figure 4] 1 is a circuit diagram showing an example of a three-phase AC circuit in a stator according to an embodiment of the present disclosure, in which the number of slots is 12. FIG. [Figure 5] FIG. 10 is an example of a winding connection diagram when the stator has 12 slots according to an embodiment of the present disclosure, showing only the U-phase winding. [Figure 6]FIG. 10 is an example of a winding connection diagram when the stator has 12 slots according to an embodiment of the present disclosure, showing only the V-phase winding. [Figure 7] FIG. 10 is an example of a winding connection diagram when the stator has 12 slots according to an embodiment of the present disclosure, showing only the W-phase winding. [Figure 8] FIG. 10 is a diagram showing another example of a winding connection diagram. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present disclosure will be described in detail with reference to FIGS. In this embodiment, the direction parallel to the axis O of the rotor 2 and stator 3 in Figures 1 to 3 is called the axial direction. The direction radial from the axis O is called the radial direction. The direction going around the axis O is called the circumferential direction. In this embodiment, one side in the axial direction is referred to as the upper side or upward direction, and the other side in the axial direction is referred to as the lower side or downward direction. In the radial direction, the direction approaching the axis O is referred to as the radially inner side, and the direction away from the axis O is referred to as the radially outer side. One side in the circumferential direction is referred to as a first circumferential direction RD1, and the other side in the circumferential direction is referred to as a second circumferential direction RD2.

[0011] <Motor> As shown in FIGS. 1 and 3, the motor 1 is a three-phase AC motor, and includes a rotor 2 and a stator 3. The rotor 2 includes a rotor shaft 21, a rotor core 22, and a plurality of magnets 23. The rotor shaft 21 is a rod-shaped member centered on an axis O. When viewed in the axial direction, the rotor shaft 21 is formed in a circular shape centered on the axis O and is provided to be rotatable about the axis O. The rotor core 22 is formed in a cylindrical shape centered on the axis O. The rotor core 22 is fixed to the outer circumferential surface of the rotor shaft 21. The rotor core 22 may be formed, for example, of a plurality of steel plates laminated in the axial direction. The magnets 23 are permanent magnets. For example, when the plurality of magnets 23 each form one magnetic pole, the plurality of magnets 23 may be arranged at equal intervals in the circumferential direction of the rotor 2 on the outer circumferential portion of the rotor 2. Alternatively, for example, one magnetic pole may be formed by the plurality of magnets 23. The plurality of magnets 23 forming one magnetic pole may be arranged at equal intervals in the circumferential direction of the rotor 2 on the outer circumferential portion of the rotor 2. The magnet 23 may be embedded inside the rotor core 22 as illustrated in FIGS. 1 and 3, or may be attached to the surface of the rotor core 22, for example.

[0012] <Stator> As shown in FIGS. 1 and 2, the stator 3 includes a stator core 4, an insulator 5, and a plurality of windings 60. <Stator core> The stator core 4 is formed in a cylindrical shape centered on the axis O. The rotor 2 described above is rotatably housed inside the stator core 4. The stator core 4 includes a cylindrical yoke 41, a plurality of teeth 42, and a plurality of slots 43.

[0013] The multiple teeth 42 protrude radially inward from the inner peripheral surface of the yoke 41 and are arranged at intervals in the circumferential direction of the stator core 4. Slots 43 are formed between the teeth 42 adjacent in the circumferential direction. As a result, the multiple teeth 42 and the multiple slots 43 are formed alternately in the circumferential direction of the stator core 4. Specifically, the teeth 42 are formed to have the same shape and size and are arranged at equal intervals in the circumferential direction. Therefore, the slots 43 are arranged at equal intervals in the circumferential direction of the stator core 4. As a result, the teeth 42 and slots 43 are alternately formed at equal intervals in the circumferential direction.

[0014] The stator core 4 is formed by, for example, laminating a plurality of electromagnetic steel sheets in the axial direction, or may be formed by, for example, powder molding.

[0015] <Insulator> The insulator 5 is attached to the stator core 4 so as to cover at least a portion of the surface of the stator core 4, with the aim of electrically insulating the winding 60 (described later) from the stator core 4. In FIGS. 1 and 2, the insulator 5 covers at least the outer peripheral surface of each tooth 42 around which the coil portions 61, 62 of the winding 60 (described later) are wound, and the inner peripheral surface of the yoke 41 on which the teeth 42 are mounted. The insulator 5 is an insulating member. The insulating member is, for example, an electrical insulating member made of synthetic resin. The insulator 5 may be molded by any molding method, for example, injection molding.

[0016] The insulator 5 has a main body portion that covers the outer peripheral surfaces of the multiple teeth 42 and the inner peripheral surface of the yoke 41, as well as a winding holding portion 51. The winding holding portion 51 may be disposed at either one end in the axial direction of the stator core 4. In the illustrated example, the winding holding portion 51 is disposed at the upper end side of the stator core 4, but it may also be disposed at the lower end side of the stator core 4, for example. The winding holding portion 51 is formed in an annular shape centered on the axis O.

[0017] The winding holding portion 51 has a plurality of transition grooves 52 formed therein, recessed from the outer periphery and extending circumferentially. The transition grooves 52 are aligned in the axial direction. Each transition groove 52 accommodates a transition wire portion 63 of the winding 60, which will be described later. The transition grooves 52 accommodate the transition wire portions 63 of the windings 60 of different phases. In this embodiment, the number of connecting grooves 52 is three. The three connecting groove portions 63 accommodate the connecting groove portions 63 of the windings 60 of three phases (U phase, V phase, and W phase), respectively. In the illustrated example, connecting groove 52U for the U phase, connecting groove 52V for the V phase, and connecting groove 52W for the W phase are aligned in this order in the upward axial direction.

[0018] 2 is divided in both the axial and circumferential directions. The insulator 5 includes an upper end insulator 55, a middle insulator 56, and a lower end insulator 57, which are arranged in this order from top to bottom in the axial direction. The upper-end insulator 55 is attached to the upper end of the stator core 4 in the axial direction. The upper-end insulator 55 includes the winding holding portion 51 described above. The middle insulator 56 is attached to the middle portion of the stator core 4 in the axial direction. The lower-end insulator 57 is attached to the lower end of the stator core 4 in the axial direction. The upper-end insulator 55 is connected to the upper end of the middle insulator 56. The lower-end insulator 57 is connected to the lower end of the middle insulator 56.

[0019] <Winding> As shown in Fig. 1 and Figs. 5 to 7, the plurality of windings 60 (60A, 60B) are wound around the plurality of teeth 42 via the insulators 5. Figs. 5 to 7 show the stator 3 linearly developed so that the circumferential direction of the stator 3 extends in the left-right direction, and only the 12 teeth 42 of the stator 3, the three transition grooves 52 of the insulators 5, and the six windings 60 (60UA, 60UB, 60VA, 60VB, 60WA, 60WB) are schematically shown, with the main body of the insulators 5 and the like being omitted. In addition, in an example of a connection diagram of the windings 60, the U-phase winding is shown in Fig. 5, the V-phase winding is shown in Fig. 6, and the W-phase winding is shown in Fig. 7.

[0020] 5 to 7, each of the plurality of windings 60A, 60B has a plurality of coil portions 61, 62, at least one crossover portion 63, and two lead-out portions 64. In the same windings 60A, 60B, the plurality of coil portions 61, 62 are wound around the teeth 42 using concentrated winding. In FIGS. 5 to 7, the coil portions 61, 62 are depicted as surrounding the teeth 42 from below, but in reality, they are wound around the teeth 42 using concentrated winding.

[0021] The crossover portion 63 connects adjacent coil portions 61, 62. The number of crossover portions 63 is one less than the number of coil portions 61, 62. The two lead-out portions 64 form the ends of the same windings 60A, 60B and extend from the coil portions 61, 62. The windings 60A and 60B in this embodiment are multi-filament wires in which a plurality of strands are bundled together in a non-aligned manner. Note that the windings 60A and 60B may also be, for example, a single strand.

[0022] In this embodiment, the number of windings 60A, 60B is six, and two of the six windings 60A, 60B are assigned to each of the three phases (U phase, V phase, and W phase). That is, the six windings 60A, 60B include two U-phase windings 60UA, 60UB, two V-phase windings 60VA, 60VB, and two W-phase windings 60WA, 60WB. The U-phase windings 60UA, 60UB, the V-phase windings 60VA, 60VB, and the W-phase windings 60WA, 60WB each have the same number of coil portions 61, 62. In this embodiment, the number of parallel windings 60U, 60V, and 60W for each phase is two. However, the number of parallel windings 60U, 60V, and 60W for each phase may be an even number, for example, four or more.

[0023] In the motor 1 of this embodiment, the number of poles of the rotor 2 and the number of slots 43 of the stator core 4 are set so as to satisfy either the following conditional formula (1) or conditional formula (2). (Conditional expression (1)) P:S=5×2m:6×2m (Conditional expression (2)) P:S=7×2m:6×2m In conditional expressions (1) and (2), P is the number of poles of the rotor 2 (the number of magnetic poles formed by the magnets 23), S is the number of slots 43 of the stator core 4, and m is a natural number. The number of slots S corresponds to the total number of coil portions 61, 62. That is, the total number of coil portions 61, 62 is set to 12m. In the motor 1 illustrated in FIG. 3, one magnet 23 forms one magnetic pole, so the number of magnets 23 (number of poles P) is 10 and the number of slots 43 (number of slots S) is 12, satisfying conditional formula (1).

[0024] For example, when the natural number m is 3, the number of slots 43 is 36. In the stator 3 illustrated in FIG. 2, the number of slots 43 is 36. In the stator 3 illustrated in FIG. 2, the total number of coil portions 61, 62 is 36. Furthermore, for example, when the natural number m is 1, the number of slots 43 (number of slots S) is 12. In the stator 3 illustrated in FIGS. 3 and 5 to 7, the number of slots 43 is 12. In the stator 3 illustrated in FIGS. 3 and 5 to 7, the total number of coil portions 61, 62 is 12.

[0025] In the motor 1 that satisfies conditional expressions (1) and (2), the coil sections 61, 62 that are concentratedly wound around the teeth 42 include a forward rotation coil section 61 and a reverse rotation coil section 62. The forward rotation coil section 61 is wound around the teeth 42 in a predetermined rotation direction. The reverse rotation coil section 62 is wound around the teeth 42 in the opposite direction to the forward rotation coil section 61. In FIGS. 5 to 7, when viewed from the center side of the stator 3, the forward rotation coil section 61 is wound counterclockwise and the reverse rotation coil section 62 is wound clockwise. The number of forward coil sections 61 and reverse coil sections 62 in each phase (U phase, V phase, W phase) is equal. In the stator 3 illustrated in Fig. 3 and Fig. 5 to Fig. 7, the number of forward coil sections 61 and reverse coil sections 62 in each phase (U phase, V phase, W phase) is two each.

[0026] In the motor 1 of this embodiment, the two windings 60 (60A, 60B) of each phase include a forward winding 60A including a plurality of forward coil portions 61 and a reverse winding 60B including a plurality of reverse coil portions 62. In other words, the windings of each phase are composed of a forward winding 60A and a reverse winding 60B. Specifically, the two U-phase windings 60UA, 60UB include a U-phase forward winding 60UA and a U-phase reverse winding 60UB. Similarly, the two V-phase windings 60VA, 60VB include a V-phase forward winding 60VA and a V-phase reverse winding 60VB. Furthermore, the two W-phase windings 60WA, 60WB include a W-phase forward winding 60WA and a W-phase reverse winding 60WB. In the stator 3 illustrated in FIGS. 3, 5 to 7, the forward winding 60A of each phase has two forward coil portions 61, and the reverse winding 60B has two reverse coil portions 62.

[0027] The three forward windings 60A (60UA, 60VA, 60WA) and the three inverting windings 60B (60UB, 60VB, 60WB) form a three-phase AC circuit. The three-phase AC circuit shown in FIG. 4 is configured with two star connections. The first star connection is configured by connecting the three-phase forward windings 60A at a neutral point N1 and has three-phase input points U1, V1, and W1. The second star connection is configured by connecting the three-phase inverting windings 60B at a neutral point N2 and has three-phase input points U2, V2, and W2. The input points U1, V1, W1, U2, V2, and W2 are first ends of the windings 60A and 60B in the longitudinal direction and are terminals for inputting drive current to the windings 60A and 60B. Two input points of the same phase (U phase: U1, U2, V phase: V1, V2, W phase: W1, W2) are connected to the same connection terminal. In the following description, one of the two lead-out wire portions 64 of each winding 60A, 60B, which forms input points U1, V1, W1, U2, V2, W2, may be referred to as input line 64IN for inputting a drive current. Note that if the number of parallel windings of each phase is an even number (four or more), it is sufficient to prepare the same number of star connections as the number of parallel windings shown in FIG. 4 and connect the input points of the same phase in the multiple star connections to the same terminal. In the forward winding 60A of each phase, two forward coil portions 61 are connected in series by a crossover portion 63. Similarly, in the reverse winding 60B of each phase, two reverse coil portions 62 are connected in series by a crossover portion 63.

[0028] 5 to 7, in a stator 3 that satisfies conditional formula (1) and has a total of 12 coil portions 61, 62 (number of slots S), the first forward coil portion 61-1 and the second forward coil portion 61-2 of the forward winding 60A of each phase are attached to two teeth 42 located on either side of four teeth 42 aligned in the circumferential direction, and are aligned in order at intervals in the first circumferential direction RD1. The first forward coil portion 61-1 is a coil portion connected to the input line 64IN, which is one of the lead-out wire portions 64, and the second forward coil portion 61-2 is a coil portion connected to the other lead-out wire portion 64.

[0029] The first inverted coil portion 62-1 and the second inverted coil portion 62-2 of the inverted winding 60B of each phase are attached to two teeth 42 located on either side of the four teeth 42 aligned in the circumferential direction, and are aligned in order at an interval in the second circumferential direction RD2. The first inverted coil portion 62-1 is a coil portion connected to the input line 64IN, which is one of the lead-out wire portions 64, and the second inverted coil portion 62-2 is a coil portion connected to the other lead-out wire portion 64. The first forward coil portion 61-1 and the first reverse coil portion 62-1 of each phase connected to the input line 64IN are arranged adjacent to each other in the second circumferential direction RD2, and the second forward coil portion 61-2 and the second reverse coil portion 62-2 of each phase are arranged adjacent to each other in the first circumferential direction RD1.

[0030] In the example shown in FIGS. 3 and 5 to 7 , from the first tooth 42 (42-1) to the twelfth tooth 42 (42-12), the first forward coil portion 61U-1 of the U-phase forward winding 60UA, the second forward coil portion 61V-2 of the V-phase forward winding 60VA, the second reverse coil portion 62V-2 of the V-phase reverse winding 60VB, the first reverse coil portion 62W-1 of the W-phase reverse winding 60WB, the first forward coil portion 62W-2 of the W-phase forward winding 60WA, the 1W-1, the second forward coil portion 61U-2 of the U-phase forward winding 60UA, the second reverse coil portion 62U-2 of the U-phase reverse winding 60UB, the first reverse coil portion 62V-1 of the V-phase reverse winding 60VB, the first forward coil portion 61V-1 of the V-phase forward winding 60VA, the second forward coil portion 61W-2 of the W-phase forward winding 60WA, the second reverse coil portion 62W-2 of the W-phase reverse winding 60WB, and the first reverse coil portion 62U-1 of the U-phase reverse winding 60UB are arranged.

[0031] In a stator that satisfies conditional formula (2) and has a total of 12 coil portions 61, 62 (number of slots S), the three-phase coil portions 61, 62 are arranged in the opposite circumferential direction to the stator 3 that satisfies conditional formula (1).

[0032] 5 to 7, the forward windings 60A of each phase have second ends opposite to the first ends forming the input points U1, V1, and W1, which serve as output points Un1, Vn1, and Wn1. The three-phase output points Un1, Vn1, and Wn1 form the neutral point N1 of the star connection shown in FIG. 4. Specifically, the three-phase output points Un1, Vn1, and Wn1 are connected to each other by a neutral wire NL1, thereby forming the neutral point N1. Similarly, the second ends of the inverting windings 60B for each phase, which are located opposite to the first ends that form the input points U2, V2, and W2, form output points Un2, Vn2, and Wn2. The three-phase output points Un2, Vn2, and Wn2 form the neutral point N2 of the star connection shown in Figure 4. Specifically, the neutral point N2 is formed by connecting the three-phase output points Un2, Vn2, and Wn2 to each other via a neutral wire NL2.

[0033] In the stator 3 illustrated in Figures 5 to 7, each of the windings 60A, 60B has two coil portions 61, 62. Therefore, each of the windings 60A, 60B has only one crossover portion 63. As a result, for each of the coil portions 61, 62 from which the lead-out portion 64 is drawn out from one circumferential side, the crossover portion 63 is drawn out from the other circumferential side. The crossover portion 63 drawn out from the other circumferential side of a given coil portion 61, 62 extends in the crossover groove 52 to the other circumferential side of the given coil portion 61, 62.

[0034] 5 to 7, for example, a lead wire portion 64 is drawn out from the second circumferential direction RD2 side of the first forward coil portion 61-1 (61U-1, 61V-1, 61W-1) of the same forward winding 60A. A crossover portion 63 is drawn out from the first circumferential direction RD1 side of the first forward coil portion 61-1, and extends in the first circumferential direction RD1. Meanwhile, a lead wire portion 64 is drawn out from the first circumferential direction RD1 side of the second forward coil portion 61-2 (61U-2, 61V-2, 61W-2) of the forward winding 60A. A crossover portion 63 is drawn out from the second circumferential direction RD2 side of the second forward coil portion 61-2, and extends in the second circumferential direction RD2.

[0035] Furthermore, a lead wire portion 64 is drawn out from the first circumferential direction RD1 side of the first inverted coil portion 62-1 (62U-1, 62V-1, 62W-1) of the same inverted winding 60B. Furthermore, a crossover portion 63 is drawn out from the second circumferential direction RD2 side of the first inverted coil portion 62-1, and the crossover portion 63 extends in the second circumferential direction RD2. Meanwhile, a lead wire portion 64 is drawn out from the second circumferential direction RD2 side of the second inverted coil portion 62-2 (62U-2, 62V-2, 62W-2) of the inverted winding 60B. Furthermore, a crossover portion 63 is drawn out from the first circumferential direction RD1 side of the second inverted coil portion 62-2, and the crossover portion 63 extends in the first circumferential direction RD1.

[0036] 5 to 7, the input wires 64IN of the forward winding 60A and the reverse winding 60B of the same phase are drawn out from the same slot 43. For example, the input wires 64IN of the U-phase forward winding 60UA and the U-phase reverse winding 60UB shown in FIG. 5 are both drawn out from the slot 43 between the twelfth tooth 42-12 and the first tooth 42-1.

[0037] <Effects> As described above, in the stator 3 of this embodiment, the winding of the same phase, which includes the forward coil portion 61 and the reverse coil portion 62, is composed of the forward winding 60A including the forward coil portion 61 and the reverse winding 60B including the reverse coil portion 62. In each of the forward winding 60A and the reverse winding 60B, the lead-out wire portion 64 is led out from one circumferential side of the coil portions 61, 62. In addition, in a predetermined coil portion 61, 62, the crossover wire portion 63 is led out from the other circumferential side and extends to the other circumferential side of the coil portion 61, 62.

[0038] Therefore, in each of the divided windings 60A, 60B, the crossover portions 63 extending from the coil portions 61, 62 do not extend across the coil portions 61, 62 from one side to the other in the circumferential direction in the crossover groove 52. Furthermore, in each of the divided windings 60A, 60B, the lead-out portions 64 extending from the coil portions 61, 62 do not extend across the coil portions 61, 62 from one side to the other in the circumferential direction. This prevents the crossover portions 63 and lead-out portions 64 constituting the same winding 60A, 60B from crossing each other. This prevents the same windings 60A, 60B from crossing each other in the crossover groove 52 and in the vicinity of the crossover groove 52.

[0039] Since the same windings 60A, 60B do not cross each other in the jumper grooves 52 and in the vicinity of the jumper grooves 52, it is possible to prevent the windings 60A, 60B from collapsing. Even if a multi-strand wire, which is prone to collapsing, is used as the windings 60A, 60B, it is possible to prevent the windings 60A, 60B from collapsing. This makes it possible to ensure a sufficient creepage distance between the jumper wire portions 63 housed in different jumper grooves 52. Furthermore, it is possible to prevent the occurrence of defective products in which the creepage distance cannot be ensured, thereby preventing a decrease in yield.

[0040] Furthermore, in the stator 3 of this embodiment, the same windings 60A, 60B do not cross over each other in the jumper groove 52 or in the vicinity of the jumper groove 52, and this makes it possible to shorten the overall length of the windings 60A, 60B compared to when such crossing occurs. This allows for a reduction in the manufacturing cost of the stator 3 (particularly the windings 60A, 60B). Furthermore, by shortening the overall length of the windings 60A, 60B, it is possible to reduce the resistance of the windings 60A, 60B, thereby improving the efficiency of the motor including the stator 3. Furthermore, because the same windings 60A, 60B do not cross over each other in or near the jumper groove 52, it is possible to prevent the windings 60A, 60B from rubbing against each other at these crossings, which would otherwise scrape off the insulating coating of the windings 60A, 60B and cause pinholes to form in the insulating coating, thereby ensuring insulation of the windings 60A, 60B.

[0041] Furthermore, in the stator 3 of this embodiment, the input wires 64IN of the forward winding 60A and the reverse winding 60B of the same phase are drawn out from the same slot 43. Therefore, these two input wires 64IN are arranged close to each other. This makes it possible to shorten the length of the two input wires 64IN when combining the two input wires 64IN into one terminal. This point will be described below.

[0042] The input wires 64IN of the forward winding 60A and the reverse winding 60B of the same phase are preferably combined into one terminal for ease of connection to a drive source (power supply). If the input wires 64IN of the forward winding 60A and the reverse winding 60B are drawn out from different slots 43, these two input wires 64IN must be extended in the circumferential direction of the stator core 4 and brought close to each other. This increases the length of the two input wires 64IN. On the other hand, if the two input wires 64IN are drawn out from the same slot 43, there is no need to extend the two input wires 64IN in the circumferential direction of the stator core 4, and therefore the length of the two input wires 64IN can be reduced. By shortening the lengths of the two input lines 64IN, the lengths of the forward winding 60A and the reverse winding 60B can be shortened, thereby reducing the resistance of each of the windings 60A, 60B. In addition, by minimizing the difference in length between the windings of multiple phases (three phases), the potential resistance of the motor 1 can be kept low.

[0043] <Other embodiments> Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to these and can be modified as appropriate within the scope of the technical idea of ​​the invention.

[0044] The stator and motor of the present disclosure are not limited to being applied to a stator having a total number of coil portions 61, 62 (number of slots S, number of teeth 42) of 12 as illustrated in Figures 3 to 7, but may also be applied to a stator having a total number of coil portions 61, 62 of more than 36, for example.

[0045] In addition, in a stator 3 that satisfies conditional formula (1) and has a total number of coil sections 61, 62 (number of slots S, number of teeth 42) of 36, the arrangement of the forward coil sections 61 and reverse coil sections 62 for three phases (U phase, V phase, W phase) can be determined based on the relationship shown in Table 1.

[0046] [Table 1] In Table 1, "ODD" indicates the odd number of the teeth 42 (slots 43), and "EVEN" indicates the even number of the teeth 42 (slots 43). The numbers of the teeth 42 (slots 43) are arranged in order in the circumferential direction of the stator. n is a natural number, and if the total number of coil portions 61, 62 is 36, n is the number 1, 2, or 3. If the value (tooth 42 number) obtained by substituting a natural number for n is 0, the total number of teeth 42 in the stator 3 (Nmax) is used as the tooth 42 number. Furthermore, if the value (tooth 42 number) obtained by substituting a natural number for n is a negative value (-α), Nmax-α is used as the tooth 42 number. For example, in Table 1, when n is 1, the U-phase forward coil portion 61U is disposed on the first and sixth teeth 42.

[0047] Furthermore, in a stator 3 that satisfies conditional formula (2) and has a total number of coil sections 61, 62 (number of slots S, number of teeth 42) of 36, the arrangement of the forward coil sections 61 and reverse coil sections 62 for three phases (U phase, V phase, W phase) can be determined according to the relationship shown in Table 2.

[0048] [Table 2]

[0049] When the total number of coil portions 61, 62 in the stator is large, the same windings 60A, 60B may have three or more coil portions 61, as shown in Fig. 8. In Fig. 8, the coil portions 61 are also depicted as surrounding the teeth 42 from below, but in reality, they are wound around the teeth 42 by concentrated winding. Although Fig. 8 shows only the forward winding 60A, the reverse winding 60B is similar. When the same winding 60A has three or more coil sections 61, the multiple coil sections 61 that make up the same winding 60A include two end coil sections 61-4 located at both ends of the arrangement direction (circumferential direction) of the multiple coil sections 61, and an intermediate coil section 61-5 located between the two end coil sections 61-4.

[0050] The end coil portion 61-4 has a lead wire portion 64 drawn from one circumferential side thereof and a crossover wire portion 63 drawn from the other circumferential side thereof. The crossover wire portion 63 drawn from the other circumferential side of the end coil portion 61-4 extends toward the other circumferential side of the end coil portion 61-4. For example, in FIG. 8 , the lead wire portion 64 is drawn from the left side of the end coil portion 61-4 located at the left end. The crossover wire portion 63 is drawn from the right side of the end coil portion 61-4 located at the left end, and extends to the right. Meanwhile, the lead wire portion 64 is drawn from the right side of the end coil portion 61-4 located at the right end. The crossover wire portion 63 is drawn from the left side of the end coil portion 61-4 located at the right end, and extends to the left. This makes it possible to prevent the crossover wire portion 63 and the lead wire portion 64 that constitute the same winding 60A from crossing each other in the crossover groove 52 and in the vicinity of the crossover groove 52.

[0051] The crossover wire portion 63 drawn out from the intermediate coil portion 61-5 to one circumferential side extends to one circumferential side of the intermediate coil portion 61-5. Similarly, the crossover wire portion 63 drawn out from the intermediate coil portion 61-5 to the other circumferential side extends to the other circumferential side of the intermediate coil portion 61-5. For example, the crossover wire portion 63 drawn out to the right side of the intermediate coil portion 61-5 shown in FIG. 8 extends rightward from the intermediate coil portion 61-5. Similarly, the crossover wire portion 63 drawn out to the left side of the intermediate coil portion 61-5 extends leftward from the intermediate coil. This prevents the crossover wire portions 63 constituting the same winding 60A from crossing each other in the crossover groove 52.

[0052] The above-described arrangement of the crossover wire portions 63 and the lead-out wire portions 64 drawn from the end coil portion 61-4 and the intermediate coil portion 61-5 provides the same effect as in the above-described embodiment, i.e., it is possible to prevent the same winding 60A from crossing over in and near the crossover groove 52.

[0053] 8 shows the U-phase forward winding 60UA as an example, the U-phase reverse winding 60UB, the V-phase forward winding 60VA, the V-phase reverse winding 60VB, the W-phase forward winding 60WA, and the W-phase reverse winding 60WB can also be configured in the same way. In the stator shown in FIG. 8, only three coil portions 61 are shown in the same forward or reverse winding, but in order for each forward or reverse winding to include the intermediate coil portion 61-5 and satisfy conditional expressions (1) and (2), the number of coil portions 61 in the same forward or reverse winding needs to be four, six, eight, etc. [Explanation of symbols]

[0054] 1...motor, 2...rotor, 3...stator, 4...stator core, 5...insulator, 42...teeth, 43...slot, 51...winding holding portion, 52...crossover groove, 60A...forward winding (winding), 60B...reverse winding (winding), 61...forward coil portion (coil portion), 62...reverse coil portion (coil portion), 63...crossover portion, 64...drawing portion, 64IN...input line, P...number of poles, S...number of slots

Claims

1. A rotor, a stator including an annular stator core having a plurality of teeth and a plurality of slots arranged in a circumferential direction, and a plurality of windings wound around the plurality of teeth; When the number of poles of the rotor is P, the number of slots of the stator core is S, and m is a natural number, P:S = 5 x 2m: 6 x 2m, or P:S = 7 x 2m: 6 x 2m Meet the conditions of Each of the plurality of windings comprises: a plurality of coil portions wound around the teeth by concentrated winding; two lead wire portions that form ends of the winding and extend from the coil portion; a crossover portion connecting adjacent coil portions, the coil section includes a forward coil section and a reverse coil section wound in the opposite direction to the forward coil section, and the winding includes a forward winding including a plurality of the forward coil sections and a reverse winding including a plurality of the reverse coil sections, In each of the forward winding and the reverse winding, The coil portion from which the lead wire portion is drawn out from one side in the circumferential direction has the crossover wire portion drawn out from the other side in the circumferential direction, The motor, wherein the crossover wire portion drawn out from the other circumferential side of the coil portion extends to the other circumferential side relative to the coil portion.

2. The stator further includes an insulator attached to the stator core, the insulator has a winding holding portion disposed on either one end side of the stator core in the axial direction, the winding holding portion has a plurality of connecting grooves recessed from an outer circumferential side, extending in the circumferential direction, and aligned in the axial direction; The motor according to claim 1 , wherein the plurality of connecting grooves accommodate the connecting wires of different phases.

3. each of the forward winding and the reverse winding has three or more of the coil portions; The plurality of coil sections constituting each of the forward winding and the reverse winding include two end coil sections located at both ends in an arrangement direction of the plurality of coil sections, and an intermediate coil section located between the two end coil sections, The end coil portion from which the lead wire portion is drawn out from one side in the circumferential direction has the crossover wire portion drawn out from the other side in the circumferential direction, the crossover wire portion drawn out from the other circumferential side of the end coil portion extends toward the other circumferential side with respect to the end coil portion, the crossover wire portion drawn out from one side of the intermediate coil portion in the circumferential direction extends toward one side of the intermediate coil portion in the circumferential direction, 3. The motor according to claim 1, wherein the crossover wire portion drawn out from the other circumferential side of the intermediate coil portion extends to the other circumferential side relative to the intermediate coil portion.

4. one of the two lead wires of each of the forward winding and the reverse winding of each phase is an input line for inputting a drive current; 3. The motor according to claim 1, wherein the input wires of the forward winding and the reverse winding in the same phase are drawn out from the same slot.

5. 3. The motor according to claim 1, wherein each of the forward winding and the reverse winding is a multi-filament wire formed by bundling a plurality of strands of wire in a non-aligned manner.

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