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. Each winding includes: a plurality of coil parts 61, 62, and 63 wound around the tooth; two lead wire parts 65 that constitute an end part of each winding and extend from each coil part; and a crossover wire part 64 that connects the adjacent coil parts. Each winding includes: a first winding 60A including a plurality of forward coil parts 61; a second winding 60B including a plurality of reverse coil parts 62; and a first winding 60C including a forward coil part 63. In each of division windings, the lead wire part is drawn from the other side of a circumference direction in each coil part in which the lead wire part is drawn from one side of the circumference direction, and the crossover wire part drawn from the other side of the circumference direction of each coil part extends the other side of the circumference direction to each 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 (P:S) of the number of poles P of the rotor to the number of slots S of the stator core is 8:9 or 10:9, 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 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, wherein when the number of poles of the rotor is P, the number of slots of the stator core is S, and n is a natural number, P:S=8n:9n or P:S=10n:9n the coil sections include a first direction rotation coil section and a second direction rotation coil section wound in the opposite direction to the first direction rotation coil section, and the windings constituting the same phase include a first winding including a plurality of the first direction rotation coil sections, a second winding including a plurality of the second direction rotation coil sections, and a third winding including a plurality of the first direction rotation coil sections, and in each of the first winding, the second winding, and the third winding, the coil section from which the pull-out sections are drawn out from one side in the circumferential direction has the jumper section drawn out from the other side in the circumferential direction, and the jumper section drawn out from the other side in the circumferential direction of the coil sections extends to the other side in the circumferential direction with respect 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, in which the rotor has 16 poles and the stator has 18 slots, as viewed from the axial direction. [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 18. FIG. [Figure 5] FIG. 10 is an example of a winding connection diagram when the stator has 18 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 18 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 18 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 coil portions 61, 62, and 63 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, such as 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 recessed from its outer periphery and extending circumferentially. The transition grooves 52 are aligned in the axial direction. Each transition groove 52 accommodates a transition wire portion 64 of the winding 60, which will be described later. The transition grooves 52 accommodate the transition wire portions 64 of the windings 60 of different phases. In this embodiment, the number of connecting grooves 52 is three. The three connecting groove portions 64 accommodate the connecting groove portions 64 of the windings 60 for 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 FIGS. 1 and 5 to 7, the plurality of windings 60 (60A, 60B, 60C) are wound around the plurality of teeth 42 via the insulators 5. In FIGS. 5 to 7, the stator 3 is linearly developed so that the circumferential direction of the stator 3 extends in the left-right direction, and only the 18 teeth 42 of the stator 3, the three transition grooves 52 of the insulators 5, and the nine windings 60 (60UA, 60UB, 60UC, 60VA, 60VB, 60VC, 60WA, 60WB, 60WC) are schematically shown, with the main body of the insulators 5 and the like being omitted. In addition, in an example of a wiring 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, 60C has a plurality of coil portions 61, 62, 63, at least one crossover portion 64, and two lead-out portions 65. In the same winding 60A, 60B, 60C, the plurality of coil portions 61, 62, 63 are wound around the teeth 42 by concentrated winding. In FIGS. 5 to 7, the coil portions 61, 62, 63 are depicted as surrounding the teeth 42 from below, but in reality, they are wound around the teeth 42 by concentrated winding.

[0021] The crossover portion 64 connects adjacent coil portions 61, 62, and 63. The number of crossover portions 64 is one less than the number of coil portions 61, 62, and 63. The two lead-out portions 65 form the ends of the same windings 60A, 60B, and 60C and extend from the coil portions 61, 62, and 63. The windings 60A, 60B, and 60C 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, 60B, and 60C may also be, for example, a single strand.

[0022] In this embodiment, there are nine windings 60A, 60B, and 60C in total, and three of the nine windings 60A, 60B, and 60C are assigned to each of the three phases (U-phase, V-phase, and W-phase). That is, the nine windings 60A, 60B, and 60C include three U-phase windings 60UA, 60UB, and 60UC, three V-phase windings 60VA, 60VB, and 60VC, and three W-phase windings 60WA, 60WB, and 60WC. The U-phase windings 60UA, 60UB, and 60UC, the V-phase windings 60VA, 60VB, and 60VC, and the W-phase windings 60WA, 60WB, and 60WC each have the same number of coil portions 61, 62, and 63. In this embodiment, the number of parallel windings 60U, 60V, and 60W for each phase is three. The number of parallel-connected windings 60U, 60V, 60W of each phase may be a multiple of three, for example, six 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=8n:9n (Conditional expression (2)) P:S=10n:9n 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 n is a natural number equal to or greater than 2. The number of slots S corresponds to the total number of coil portions 61, 62, and 63. That is, the total number of coil portions 61, 62, and 63 is set to 9n. In the motor 1 illustrated in FIG. 3, one magnet 23 constitutes one magnetic pole, so the number of magnets 23 (number of poles P) is 16 and the number of slots 43 (number of slots S) is 18, satisfying conditional formula (1).

[0024] For example, when the natural number n is 4, 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, and 63 is 36. Furthermore, for example, when the natural number n is 2, the number of slots 43 is 18. In the stator 3 illustrated in Figs. 3 and 5 to 7, the number of slots 43 is 18. In the stator 3 illustrated in Figs. 3 and 5 to 7, the total number of coil portions 61, 62, and 63 is 18.

[0025] In the motor 1 that satisfies conditional formula (1), the coil portions 61, 62, 63 that are wound in a concentrated manner around the teeth 42 include forward rotation coil portions 61, 63 (first direction rotation coil portions) and reverse rotation coil portions 62 (second direction rotation coil portions). The forward rotation coil portions 61, 63 are wound around the teeth 42 in a predetermined rotation direction. The reverse rotation coil portion 62 is wound around the teeth 42 in the opposite direction to the forward rotation coil portions 61, 63. In FIGS. 5 to 7, the forward rotation coil portions 61, 63 are wound counterclockwise, and the reverse rotation coil portion 62 is wound clockwise. Each phase (U phase, V phase, W phase) has a plurality of coil unit sections, each of which has a first forward coil section 61, a reverse coil section 62, and a second forward coil section 63 arranged adjacent to each other. In the stators 3 illustrated in Figs. 3 and 5 to 7, each phase has two such coil unit sections.

[0026] In the motor 1 of this embodiment, the three windings 60 (60A, 60B, 60C) for each phase include a first winding 60A including a plurality of first forward coil portions 61, a second winding 60B including a plurality of second forward coil portions 62, and a third winding 60C including a plurality of second forward coil portions 63. In other words, the windings for each phase are made up of the first winding 60A, the second winding 60B, and the third winding 60C. Specifically, the three U-phase windings 60UA, 60UB, 60UC include a U-phase first winding 60UA, a U-phase second winding 60UB, and a U-phase third winding 60UC. Similarly, the three V-phase windings 60VA, 60VB, 60VC include a V-phase first winding 60VA, a V-phase second winding 60VB, and a V-phase third winding 60VC. Furthermore, the three W-phase windings 60WA, 60WB, 60WC include a W-phase first winding 60WA, a W-phase second winding 60WB, and a W-phase third winding 60WC. In the stator 3 illustrated in Figures 3, 5 to 7, the first winding 60A of each phase has two first normal coil portions 61, and the second winding 60B has two reverse coil portions 62. In addition, the third winding 60C of each phase has two second normal coil portions 63.

[0027] The three first windings 60A (60UA, 60VA, 60WA), the three second windings 60B (60UB, 60VB, 60WB), and the three tertiary windings 60A (60UA, 60VA, 60WA) form a three-phase AC circuit. The three-phase AC circuit shown in FIG. 4 is configured with three star connections. The first star connection is configured by connecting the three-phase first 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 second windings 60B at a neutral point N2 and has three-phase input points U2, V2, and W2. The third star connection is configured by connecting the three-phase tertiary windings 60C at a neutral point N3 and has three-phase input points U3, V3, and W3. Input points U1, V1, W1, U2, V2, W2, U3, V3, and W3 are first ends of the windings 60A, 60B, and 60C in the longitudinal direction, and are terminals for inputting drive current to the windings 60A, 60B, and 60C. Three input points of the same phase (U phase: U1, U2, and U3; V phase: V1, V2, and V3; W phase: W1, W2, and W3) are connected to the same connection terminal. In the following description, one of the two lead-out portions 65 of each winding 60A, 60B, and 60C, which forms the input point U1, V1, W1, U2, V2, W2, U3, V3, and W3, may be referred to as the input line 65IN for inputting the drive current. If the number of parallel windings for each phase is a multiple of three (6 or more), then it is sufficient to prepare the same number of star connections as the number of parallel windings shown in Figure 4 and connect the input points of the same phase in multiple star connections to the same terminal. In the first winding 60A of each phase, two forward coil portions 61 are connected in series by a crossover portion 64. Similarly, in the second winding 60B of each phase, two reverse coil portions 62 are connected in series by a crossover portion 64. Furthermore, in the third winding 60C of each phase, two forward coil portions 63 are connected in series by a crossover portion 64.

[0028] 5 to 7, in a stator 3 that satisfies conditional formula (1) and has a total of 18 coil portions 61, 62, 63 (number of slots S), the first forward coil portion 61-1 and the second forward coil portion 61-2 of the first winding 60A of each phase are attached to two teeth 42 located on either side of the eight 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 65IN, which is one of the lead-out wire portions 65, and the second forward coil portion 61-2 is a coil portion connected to the other lead-out wire portion 65.

[0029] The first inverted coil portion 62-1 and the second inverted coil portion 62-2 of the second winding 60B of each phase are attached to two teeth 42 located on either side of the eight teeth 42 aligned in the circumferential direction, and are aligned in order at intervals in the second circumferential direction RD2. The first inverted coil portion 62-1 is a coil portion connected to the input line 65IN, which is one of the lead-out wire portions 65, and the second inverted coil portion 62-2 is a coil portion connected to the other lead-out wire portion 65.

[0030] The first forward coil portion 63-1 and the second forward coil portion 63-2 of the third winding 60C of each phase are attached to two teeth 42 located on either side of the eight 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 63-1 is a coil portion connected to the input line 65IN, which is one of the lead-out wire portions 65, and the second forward coil portion 63-2 is a coil portion connected to the other lead-out wire portion 65.

[0031] The first forward coil portion 61-1 of the first winding 60A, the first reverse coil portion 62-1 of the second winding 60B, and the first forward coil portion 63-1 of the third winding 60C of each phase connected to the input line 65IN are arranged adjacent to each other in the first circumferential direction RD1. Also, the second forward coil portion 61-2 of the first winding 60A, the second reverse coil portion 62-2 of the second winding 60B, and the second forward coil portion 63-2 of the third winding 60C of each phase are arranged adjacent to each other in the first circumferential direction RD1.

[0032] In the example shown in FIGS. 3 and 5 to 7 , from the first tooth 42 (42-1) to the 18th tooth 42 (42-18), the first forward coil portion 63U-1 of the U-phase third winding 60UC, the first forward coil portion 61V-1 of the V-phase first winding 60VA, the first reverse coil portion 62V-1 of the V-phase second winding 60VB, the first forward coil portion 63V-1 of the V-phase third winding 60VC, the first forward coil portion 61W-1 of the W-phase first winding 60WA, the first reverse coil portion 62W-1 of the W-phase second winding 60WB, the first forward coil portion 63W-1 of the W-phase third winding 60WC, and the second forward coil portion 6 1U-2, the second reverse coil portion 62U-2 of the U-phase second winding 60UB, the second forward coil portion 63U-2 of the U-phase third winding 60UC, the second forward coil portion 61V-2 of the V-phase first winding 60VA, the second reverse coil portion 62V-2 of the V-phase second winding 60VB, the second forward coil portion 63V-2 of the V-phase third winding 60VC, the second forward coil portion 61W-2 of the W-phase first winding 60WA, the second reverse coil portion 62W-2 of the W-phase second winding 60WB, the second forward coil portion 63W-2 of the W-phase third winding 60WC, the first forward coil portion 61U-1 of the U-phase first winding 60UA, and the first reverse coil portion 62U-1 of the U-phase second winding 60UB are lined up.

[0033] In the examples shown in Figures 3 and 5 to 7, a coil unit in which the first forward coil section 61, the reverse coil section 62, and the second forward coil section 63 of the U phase are arranged side by side, a coil unit in which the first forward coil section 61, the reverse coil section 62, and the second forward coil section 63 of the V phase are arranged side by side, and a coil unit in which the first forward coil section 61, the reverse coil section 62, and the second forward coil section 63 of the W phase are arranged side by side, are arranged in order and repeated in the first circumferential direction RD1.

[0034] In the stator of the motor that satisfies conditional formula (2), as in conditional formula (1), there is a coil unit in which the first forward coil portion 61, the reverse coil portion 62, and the second forward coil portion 63 are arranged adjacent to each other. However, in the stator that satisfies conditional formula (2), the following coil portions are repeatedly arranged in order in the second circumferential direction RD2: a coil portion unit in which the first forward coil portion 61, the reverse coil portion 62, and the second forward coil portion 63 of the U phase are arranged adjacent to each other; a coil portion unit in which the first forward coil portion 61, the reverse coil portion 62, and the second forward coil portion 63 of the V phase are arranged adjacent to each other; and a coil portion unit in which the first forward coil portion 61, the reverse coil portion 62, and the second forward coil portion 63 of the W phase are arranged adjacent to each other.

[0035] 5 to 7, the first 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, second ends of the second windings 60B of each phase, located opposite to the first ends forming 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 Fig. 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. Additionally, second ends of the third windings 60C of each phase, located opposite to the first ends forming the input points U3, V3, and W3, form output points Un3, Vn3, and Wn3. The three-phase output points Un3, Vn3, and Wn3 form the neutral point N3 of the star connection shown in Fig. 4. Specifically, the neutral point N3 is formed by connecting the three-phase output points Un3, Vn3, and Wn3 to each other via a neutral wire NL3.

[0036] In the stator 3 illustrated in Figures 5 to 7, each winding 60A, 60B, 60C has two coil portions 61, 62, 63. Therefore, each winding 60A, 60B, 60C has only one crossover portion 64. For each coil portion 61, 62, 63 from which a lead-out portion 65 is drawn out from one circumferential side, a crossover portion 64 is drawn out from the other circumferential side. The crossover portion 64 drawn out from the other circumferential side of a given coil portion 61, 62, 63 extends to the other circumferential side of the given coil portion 61, 62, 63 in the crossover groove 52.

[0037] 5 to 7, for example, a lead wire portion 65 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 first winding 60A. A crossover portion 64 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 65 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 first winding 60A. A crossover portion 64 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.

[0038] Furthermore, a lead wire portion 65 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 second winding 60B. Furthermore, a crossover portion 64 is drawn out from the second circumferential direction RD2 side of the first inverted coil portion 62-1, and the crossover portion 64 extends in the second circumferential direction RD2. Meanwhile, a lead wire portion 65 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 second winding 60B. Furthermore, a crossover portion 64 is drawn out from the first circumferential direction RD1 side of the second inverted coil portion 62-2, and the crossover portion 64 extends in the first circumferential direction RD1.

[0039] Furthermore, a lead wire portion 65 is drawn out from the second circumferential direction RD2 side of the first forward coil portion 63-1 (63U-1, 63V-1, 63W-1) of the same third winding 60C. Furthermore, a crossover portion 64 is drawn out from the first circumferential direction RD1 side of the first forward coil portion 63-1, and extends in the first circumferential direction RD1. Meanwhile, a lead wire portion 65 is drawn out from the first circumferential direction RD1 side of the second forward coil portion 63-2 (63U-2, 63V-2, 63W-2) of the third winding 60C. Furthermore, a crossover portion 64 is drawn out from the second circumferential direction RD2 side of the second forward coil portion 63-2, and extends in the second circumferential direction RD2.

[0040] In the stator 3 illustrated in FIGS. 5 to 7, the input wires 65IN of the first winding 60A, the second winding 60B, and the third winding 60C of the same phase are drawn out from the same slot 43 or from two slots 43 located on either side of a predetermined slot 43. In the example illustrated in FIG. 5, the input wires 65IN of the U-phase second winding 60UB and the U-phase third winding 60UC are both drawn out from the slot 43 between the 18th tooth 42-18 and the first tooth 42-1. Meanwhile, the input wire 65IN of the U-phase first winding 60UA is drawn out from the slot 43 between the 16th tooth 42-16 and the 17th tooth 42-17. That is, the input wire 65IN of the U-phase first winding 60UA and the input wires 65IN of the U-phase second winding 60UB and the U-phase third winding 60UC are drawn out from two slots 43 located on either side of a predetermined slot 43. The arrangement of the input line 65IN of the first winding 60A, the second winding 60B, and the third winding 60C in the same phase described above is due to the fact that the first coil portion 61-1 of the first winding 60A, the first coil portion 62-1 of the second winding 60B, and the first coil portion 63-1 of the third winding 60C of each phase connected to the input line 65IN are arranged adjacent to each other in the first circumferential direction RD1.

[0041] <Effects> As described above, in the stator 3 of this embodiment, the windings constituting the same phase are configured with the first winding 60A including a plurality of first forward rotation coil portions 61 (first direction rotation coil portions), the second winding 60B including a plurality of reverse rotation coil portions 62 (second direction rotation coil portions), and the third winding 60C including a plurality of second forward rotation coil portions 63 (first direction rotation coil portions). Furthermore, in each of the first winding 60A, the second winding 60B, and the third winding 60C, the lead-out wire portion 65 is drawn out from one circumferential side of a predetermined coil portion 61, 62, or 63. Furthermore, in a predetermined coil portion 61, 62, or 63, the crossover wire portion 64 is drawn out from the other circumferential side and extends to the other circumferential side of the coil portion 61, 62, or 63.

[0042] Therefore, in each of the windings 60A, 60B, and 60C, the crossover portions 64 extending from the coil portions 61, 62, and 63 do not extend across the coil portions 61, 62, and 63 from one side to the other in the circumferential direction in the crossover groove 52. Similarly, in each of the windings 60A, 60B, and 60C, the lead-out portions 65 extending from the coil portions 61, 62, and 63 do not extend across the coil portions 61, 62, and 63 from one side to the other in the circumferential direction. This prevents the crossover portions 64 and the lead-out portions 65 constituting the same winding 60A, 60B, and 60C from crossing each other. This prevents the same windings 60A, 60B, and 60C from crossing each other in the crossover groove 52 and in the vicinity of the crossover groove 52.

[0043] Since the same windings 60A, 60B, 60C 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, 60C from collapsing. Even if a multi-strand wire, which is prone to collapsing, is used as the windings 60A, 60B, 60C, it is possible to prevent the windings 60A, 60B, 60C from collapsing. This ensures a sufficient creepage distance between the jumper wire portions 64 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.

[0044] Furthermore, in the stator 3 of this embodiment, the same windings 60A, 60B, 60C do not cross over each other in the jumper groove 52 or in the vicinity of the jumper groove 52, which makes it possible to shorten the overall length of the windings 60A, 60B, 60C compared to when such crossings are present. This allows for a reduction in the manufacturing cost of the stator 3 (particularly the windings 60A, 60B, 60C). Furthermore, by shortening the overall length of the windings 60A, 60B, and 60C, it is possible to reduce the resistance of the windings 60A, 60B, and 60C, thereby improving the efficiency of the motor including the stator 3. Furthermore, because the same windings 60A, 60B, 60C do not cross over each other in or near the jumper grooves 52, it is possible to prevent the windings 60A, 60B, 60C from rubbing against each other at these crossings, which would scrape off the insulating coating of the windings 60A, 60B, 60C and cause pinholes to form in the insulating coating, thereby ensuring insulation of the windings 60A, 60B, 60C.

[0045] As described above, in the stator 3 of this embodiment, the windings constituting the same phase are composed of the first winding 60A including a plurality of first forward rotation coil portions 61 (first direction rotation coil portions), the second winding 60B including a plurality of reverse rotation coil portions 62 (second direction rotation coil portions), and the third winding 60C including a plurality of second forward rotation coil portions 63 (first direction rotation coil portions). This allows the lead-out portions 65 of the first to third windings 60A to 60C constituting the same phase to be arranged close to each other, even if some of the lead-out portions 65 of the first to third windings 60A to 60C do not extend along the circumferential direction of the stator core 4. This allows the lead-out portions 65 of the first to third windings 60A to 60C to be gathered together and then extracted, effectively preventing differences in length among the first to third windings 60A to 60C and preventing differences in electrical resistance among the first to third windings 60A to 60C. Therefore, the generation of circulating current in the three-phase AC circuit of the motor 1 can be suppressed.

[0046] Furthermore, in the stator 3 of this embodiment, the input wires 65IN of the first winding 60A, the second winding 60B, and the third winding 60C of the same phase are drawn out from the same slot 43 or two slots 43 located on either side of a predetermined slot 43. Therefore, these two input wires 65IN are arranged close to each other. This makes it possible to shorten the lengths of the three input wires 65IN when the three input wires 65IN are combined into one terminal. This point will be described below.

[0047] The input wires 65IN of the first to third windings 60A to 60C of the same phase are preferably collected into one terminal for ease of connection to a drive source (power supply). Here, if the input wires 65IN of the first to third windings 60A to 60C are drawn out from slots 43 located apart from one another, the input wires 65IN need to be extended in the circumferential direction of the stator core 4 to bring the three input wires 65IN closer to one another. This increases the length of the input wires 65IN. On the other hand, if the three input wires 65IN are drawn out from slots 43 located close to one another, the three input wires 65IN do not need to be extended in the circumferential direction of the stator core 4, and the lengths of the three input wires 65IN can be kept short. By shortening the length of the three input wires 65IN, the length of each of the first to third windings 60A to 60C can be shortened, thereby reducing the resistance of the first to third windings 60A to 60C. Furthermore, by minimizing the difference in the length of the windings of the multiple phases (three phases), the difference in the electrical resistance of the motor 1 can be minimized. Therefore, the generation of circulating current in the three-phase AC circuit of the motor 1 can be suppressed.

[0048] <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.

[0049] 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, 63 (number of slots S, number of teeth 42) of 18 as illustrated in Figures 3 to 7, but may also be applied to a stator having a total number of coil portions 61, 62, 63 of more than 36, for example.

[0050] In addition, in a stator 3 that satisfies conditional formula (1) and has a total of 36 coil sections 61, 62, and 63 (number of slots S, number of teeth 42), the arrangement of the first forward coil section 61, the reverse coil section 62, and the second forward coil section 63 of the three phases (U phase, V phase, and W phase) can be determined according to the relationship shown in Table 1.

[0051] [Table 1]

[0052] Table 1 shows the numbers of the teeth 42 (slots 43) on which the first forward coil section 61 (forward coil section (1st)), the reverse coil section 62, and the second forward coil section 63 (forward coil section (2nd)) of each phase (U phase, V phase, W phase) are arranged. 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 sections 61, 62, and 63 is 36, n can be one of the numbers 1, 2, 3, or 4. If a natural number is substituted for n and the value (tooth 42 number) is 0, the total number of teeth 42 (Nmax) on the stator 3 is used as the tooth 42 number. Furthermore, if a natural number is substituted for n and the value (tooth 42 number) is a negative value (-α), Nmax-α is used as the tooth 42 number. Furthermore, if a natural number is substituted for n and the resulting value (number Ns of teeth 42) is greater than the total number (Nmax) of teeth 42, then the number of teeth 42 is determined as (Ns-Nmax). For example, in Table 1, when n is 1, the first forward coil portion 61U of the U phase (forward coil portion (1st)) is arranged on the 35th tooth .

[0053] Furthermore, in a stator 3 that satisfies conditional formula (2) and has a total number of coil sections (number of slots S, number of teeth 42) of 36, the arrangement of the first inverted coil section (inverted coil section (1st)), forward coil section, and second inverted coil section (inverted coil section (2nd)) of the three phases (U phase, V phase, W phase) can be determined in accordance with the relationship shown in Table 2.

[0054] [Table 2]

[0055] When the total number of coil portions 61, 62, 63 in the stator is large, each winding 60A, 60B, 60C 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 first winding 60A, the same applies to the second winding 60B and the third winding 60C. 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.

[0056] The end coil portion 61-4 has a lead wire portion 65 drawn from one circumferential side thereof and a crossover wire portion 64 drawn from the other circumferential side thereof. The crossover wire portion 64 drawn from the other circumferential side of the end coil portion 61-4 extends to one 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 64 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 65 is drawn from the right side of the end coil 61-4 located at the right end. The crossover wire portion 64 is drawn from the left side of the end coil 61-4 located at the right end, and extends to the left. This prevents the crossover wire portions 64 and the lead wire portions 65 that constitute the same winding 60A from crossing each other in the crossover grooves 52 and in the vicinity of the crossover grooves 52.

[0057] The crossover wire portion 64 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 64 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 64 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 64 drawn out to the left side of the intermediate coil portion 61-5 extends leftward from the intermediate coil portion 61-5. This prevents the crossover wire portions 64 constituting the same winding 60A from crossing each other in the crossover groove 52.

[0058] The above-described arrangement of the crossover wire portions 64 and the lead-out wire portions 65 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.

[0059] 8 shows U-phase first winding 60UA as an example, U-phase second winding 60UB, U-phase third winding 60UC, V-phase first winding 60VA, V-phase second winding 60VB, V-phase third winding 60VC, W-phase first winding 60WA, W-phase second winding 60WB, and W-phase third winding 60WC can also be configured in a similar manner. In the stator illustrated in FIG. 8, only three coil portions 61 are shown in the same winding, but the number of coil portions 61 in the same winding may be any number, such as five, six, or seven.

[0060] In the present disclosure, for example, one winding constituting the same phase may include both the first forward rotation coil portion 61 (first direction rotation coil portion) and the second forward rotation coil portion 63 (first direction rotation coil portion) of the multiple coil portion units. That is, the first winding 60A and the third winding 60C in the above embodiment may be configured by, for example, one winding. [Explanation of symbols]

[0061] 1...motor, 2...rotor, 3...stator, 4...stator core, 5...insulator, 42...teeth, 43...slot, 51...winding holding portion, 52...crossover groove, 60A...first winding (winding), 60B...second winding (winding), 60C...third winding (winding), 61, 63...forward rotation coil portion (first direction rotation coil portion), 61-4...end coil portion, 61-5...intermediate coil portion, 62...reverse coil portion (second direction rotation coil portion), 64...crossover portion, 65...lead-out portion, 65IN...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 n is a natural number, P:S = 8n:9n, or P:S = 10n:9n 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 first direction rotation coil section and a second direction rotation coil section wound in the opposite direction to the first direction rotation coil section, and the windings constituting the same phase include a first winding including a plurality of the first direction rotation coil sections, a second winding including a plurality of the second direction rotation coil sections, and a third winding including a plurality of the first direction rotation coil sections, In each of the first winding, the second winding, and the third 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. the coil section includes a plurality of coil section units in which a first first direction rotation coil section, a second direction rotation coil section, and a second first direction rotation coil section are arranged in the circumferential direction, The first winding includes a plurality of first direction rotating coil portions of the coil portion unit, The second winding includes a plurality of second direction rotating coil portions of the coil portion unit, The third winding includes a plurality of second first direction rotating coil portions of the coil portion unit. The motor according to claim 1 or 2.

4. each of the first winding, the second winding, and the third winding has three or more of the coil portions; the plurality of coil sections constituting each of the first winding, the second winding, and the third 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.

5. one of the two lead wires of each of the first winding, the second winding, and the third winding of each phase is an input line for inputting a drive current; 3. The motor according to claim 1 or 2, wherein the input wires of the first winding, the second winding, and the third winding in the same phase are drawn out from the same slot or two slots located on either side of a given slot.

6. 3. The motor according to claim 1, wherein each of the first winding, the second winding, and the third winding is a multi-filament winding in which a plurality of strands are bundled together in a non-aligned manner.

Images