Stator

Abstract

To provide a stator capable of suppressing a size, in a radial direction of a coil, at a portion where one end side coil part and the other end side coil part are connected to each other.SOLUTION: A stator 100 comprises: a stator core 101; and a coil 102 including a V-phase coil set 3 and a U-phase coil set 2. The V-phase coil set 3 and the U-phase coil set 2 each comprise one end side coil parts 30, 20, the other end side coil parts 31, 21, and crossover wires 32, 22 for connecting the one end side coil parts 30, 20 to the other end side coil parts 31, 21, respectively. In the V-phase coil set 3 and the U-phase coil set 2, multiple rows of the crossover wires 22, 32 are overlapped as viewed in an axial direction, and multiple rows of crossover wires 32 in the V-phase coil set 3 and multiple rows of crossover wires 22 in the U-phase coil set 2 are arranged at an outermost peripheral position and an innermost peripheral position in the coil 102, respectively.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a stator. [Background technology]

[0002] BACKGROUND ART Conventionally, a stator including a coil and a stator core is known (for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses a stator including a coil and a stator core. In Patent Document 1, the coil includes a U-phase coil, a V-phase coil, and a W-phase coil, and each phase coil is configured with multiple rows of conductors connected in parallel, the number of rows being a multiple of 2. One end of each of the U-phase coil, the V-phase coil, and the W-phase coil is connected to a power line, and the other end is connected to a neutral line. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-140708 Summary of the Invention [Problem to be solved by the invention]

[0005] Although not explicitly stated in Patent Document 1, in the field of stators, it is known to arrange the one-end coil portion of a U-phase coil, which is on the power line side, and the other-end coil portion, which is on the neutral line side, on a stator core using the same winding method, and to provide a crossover portion connecting the one-end coil portion and the other-end coil portion so that currents flow in opposite directions. The same applies to the V-phase coil and the W-phase coil. In this case, the crossover portion between the one-end coil portion and the other-end coil portion has an irregular shape, which requires bending the crossover portion, resulting in an increase in the radial size of the coil between the one-end coil portion and the other-end coil portion. For this reason, there has been a need to reduce the radial size of the coil at the connection point between the one-end coil portion and the other-end coil portion.

[0006] This invention has been made to solve the above-mentioned problems, and one object of this invention is to provide a stator that can reduce the radial size of the coil at the point where the one end side coil portion and the other end side coil portion are connected. [Means for solving the problem]

[0007] In order to achieve the above object, a stator according to one aspect of the present invention includes a stator core including a plurality of slots extending in the axial direction and arranged in the circumferential direction, a first coil set of a first phase with a number of rows that is a multiple of two arranged in the stator core in a state of being connected in parallel to each other, and a second coil set of a second phase with a number of rows that is a multiple of two arranged in the stator core in a state of being connected in parallel to each other, and the first coil set and the second coil set each include one-end side coil portions of a number of rows that is a multiple of two introduced into the stator core, and The stator core has multiple rows of one-end coil sections that are arranged in the opposite circumferential direction to the one-end coil sections and are led out from the stator core, and multiple rows of jumper wires that are multiples of two that connect the one-end coil sections and the other-end coil sections on one axial end face side of the stator core, and in each of the first coil set and the second coil set, the multiple rows of jumper wires overlap when viewed in the axial direction, and the multiple rows of jumper wires of the first coil set and the multiple rows of jumper wires of the second coil set are arranged at the outermost and innermost positions of the coils, respectively.

[0008] In a stator according to one aspect of the present invention, as described above, each of the first coil set and the second coil set includes a plurality of rows of one-end coil portions (a multiple of two) introduced into the stator core, a plurality of rows of other-end coil portions (a multiple of two) arranged in the circumferentially opposite direction to the one-end coil portions and extending from the stator core, and a plurality of rows of crossover wires (a multiple of two) connecting the one-end coil portions and the other-end coil portions at one axial end face of the stator core. This allows the one-end coil portions and the other-end coil portions to be separate components, so that the one-end coil portions and the other-end coil portions can be connected simply by joining the crossover wires to the one-end coil portions. In other words, there is no need to provide a bent portion at the connection point between the one-end coil portions and the other-end coil portions. Furthermore, in each of the first coil set and the second coil set, the plurality of rows of crossover wires overlap in the axial direction. This reduces the size of the multiple rows of jumper wires in the radial direction perpendicular to the axial direction. This reduces the radial size of the coil at the point where the one-end coil section and the other-end coil section are connected. Furthermore, the multiple rows of jumper wires of the first coil set and the multiple rows of jumper wires of the second coil set are arranged at the outermost and innermost positions of the coils, respectively. Terminals connected to power lines and the like are provided in each of the first coil set and the second coil set. This configuration allows the multiple rows of jumper wires of the first coil set at the outermost position and the multiple rows of jumper wires of the second coil set at the innermost position to be distributed on the inner and outer sides, making it possible to overlap the multiple rows of jumper wires of the first coil set and the multiple rows of jumper wires of the second coil set in the circumferential direction, and thereby enabling the terminals connected to the power lines and the like of the first coil set and the second coil set to be centrally arranged in the circumferential direction.

[0009] In the stator according to the aforementioned aspect, the crossover wires of the first coil set and the crossover wires of the second coil set preferably overlap each other when viewed in the radial direction.

[0010] With this configuration, the jumper wire of the first coil set at the outermost position and the jumper wire of the second coil set at the innermost position can be arranged overlapping in the circumferential direction, allowing the terminals connected to the power lines of the first coil set and the second coil set to be arranged more closely together in the circumferential direction.

[0011] In this case, preferably, the coil has a number of rows of one-end coil portions that are multiples of two that are introduced into the stator core, a number of rows of other-end coil portions that are arranged in the stator core in the opposite circumferential direction to the one-end coil portions and are led out from the stator core, and a number of rows of jumper wires that are multiples of two that connect the one-end coil portions and the other-end coil portions on one axial end face side of the stator core, and further includes a third coil set of a third phase having a number of rows that are multiples of two that are arranged in the stator core in a state connected in parallel to each other, wherein the number of rows of jumper wires of the third coil set are arranged at the innermost position among the coils, and the jumper wires of the first coil set overlap with the jumper wires of the second coil set on one circumferential side when viewed radially, and overlap with the jumper wires of the third coil set on the other circumferential side when viewed radially.

[0012] With this configuration, the crossover wire of the first coil set at the outermost position can be arranged to overlap the crossover wire of the second coil set at the innermost position on one side in the circumferential direction, and the crossover wire of the first coil set at the outermost position can be arranged to overlap the crossover wire of the third coil set at the innermost position on the other side in the circumferential direction. As a result, terminals connected to the power lines, etc. of the first coil set, second coil set, and third coil set can be arranged more closely together in the circumferential direction.

[0013] In the stator according to the aforementioned aspect, the plurality of rows of crossover wires of the second coil set are preferably arranged to protrude radially inward beyond an inner peripheral end face of the stator core.

[0014] With this configuration, by arranging the multiple rows of jumper wires of the second coil set so that they protrude radially inward from the inner end face of the stator core, a relatively large space can be secured on the outer side, where the coils are normally pulled out for connection to the power line.

[0015] In the stator according to the above aspect, the following configuration is also possible.

[0016] (Additional note 1) In the above stator, the crossover wire is preferably formed in a U-shape with a pair of joints provided at both ends of the crossover wire and facing outward in the axial direction, opposite to the stator core side.

[0017] With this configuration, the crossover wire is provided at both ends of the crossover wire and is formed in a U-shape with a pair of joints facing outward in the axial direction, that is, away from the stator core side, so that the crossover wire is prevented from protruding from the joints toward the side away from the stator core side, thereby reducing the size of the coil in the axial direction.

[0018] (Additional note 2) In the above stator, preferably, the coil further includes a plurality of slot receiving portions received in the slots, and only two of the slot receiving portions are received in each slot and aligned in the radial direction.

[0019] With this configuration, the radial size of the coil can be reduced in a coil made of a relatively thick conductor wire.

[0020] (Additional note 3) In the above stator, the coil is preferably formed by joining multiple U-shaped segment coils, and the segment coils are arranged on the other axial end face side of the stator core and have coil end portions bent so as to protrude axially outward, on the opposite side from the axial stator core side, and a pair of joint portions arranged on one axial end face side of the stator core, and the coil end portions of the multiple segment coils are arranged in a circular ring shape on the other end face side with the same shape continuing around the entire circumferential direction.

[0021] By configuring it in this manner, the bent coil end portion on the other end face side can be arranged in a circular ring shape with the same shape continuing around the entire circumferential direction, thereby avoiding the occurrence of partially irregularly shaped areas on the other end face side, which would increase the radial size of the coil.

[0022] (Additional note 4) In the above stator, preferably, the one-end coil portion and the other-end coil portion of each of the first coil set and the second coil set are arranged relative to the stator core at positions circumferentially offset from each other, and the portions arranged on the stator core have the same shape.

[0023] By configuring in this manner, the one-end coil portion and the other-end coil portion of each of the first coil set and the second coil set can be arranged on the stator core using the same procedure, thereby facilitating the work of arranging the coils.

[0024] (Additional note 5) In a configuration in which the above coil includes a third coil set of a third phase, the first coil set, the second coil set, and the third coil set are preferably arranged at circumferentially offset positions relative to the stator core, and the portions arranged on the stator core, excluding the crossover wires, have the same shape.

[0025] With this configuration, the first coil set, second coil set, and third coil set, excluding the crossover wires, can be arranged on the stator core in the same procedure, thereby facilitating the work of arranging the coils. [Effects of the Invention]

[0026] According to the present invention, as described above, it is possible to reduce the radial size of the coil at the point where the one end side coil portion and the other end side coil portion are connected. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 2 is a perspective view showing a stator according to an embodiment from one end face side. [Figure 2] 2 is a perspective view showing one end face side of the stator according to the embodiment, viewed from a direction different from that of FIG. 1. FIG. [Figure 3] FIG. 10 is a perspective view showing the stator according to the embodiment from the other end face side. [Figure 4] FIG. 2 is a circuit diagram showing a wiring configuration of a stator coil according to an embodiment. [Figure 5] FIG. 2 is a perspective view showing a U-phase (W-phase) coil set according to the embodiment. [Figure 6] FIG. 2 is a plan view showing the stator according to the embodiment from one end face side. [Figure 7] A cross-sectional view for explaining a segment coil according to an embodiment. [Figure 8] 3A to 3C are diagrams for explaining a method of arranging (winding) coils on a stator core according to an embodiment. [Figure 9] FIG. 2 is a perspective view showing a V-phase coil set according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, the present embodiment of the present invention will be described with reference to the drawings.

[0029] [Embodiment] (Stator structure) The structure of a stator 100 according to this embodiment will be described with reference to Figures 1 to 9. The stator 100 has an annular shape centered on a central axis C1. The stator 100 is configured to generate a magnetic field for rotating a rotor (not shown) disposed radially inside the stator 100.

[0030] In each figure, the axial direction in which the rotor shaft (central axis C1) extends is indicated as the Z direction. One of the Z directions is indicated as the Z1 direction, and the other is indicated as the Z2 direction. Also, in each figure, the radial direction of the stator 100 is indicated as the RO direction. Of the R directions, the radially outer side is indicated as the R1 direction, and the radially inner side is indicated as the R2 direction. Also, in each figure, the circumferential direction of the stator 100 is indicated as the RO direction. Of the RO directions, the clockwise direction when viewing the stator 100 from the Z1 direction side is indicated as the RO1 direction, and the opposite direction is indicated as the RO2 direction.

[0031] 1 to 3 constitutes, together with a rotor (not shown), a part of a rotating electric machine that functions as a motor or a generator. The rotating electric machine is an inner rotor type rotating electric machine.

[0032] As shown in FIG. 2, the stator 100 includes a stator core 101 and a coil 102.

[0033] (Configuration of stator core) The stator core 101 is formed by stacking multiple electromagnetic steel sheets in the axial direction. The stator core 101 includes multiple slots 101a that extend axially and are arranged at equal angular pitches in the circumferential direction. The slots 101a are sandwiched between teeth on both sides in the circumferential direction, and a back yoke is provided on the radially outer side. As an example, 48 slots 101a are provided. The stator core 101 has one end face 101b located on the Z1 direction side and the other end face 101c located on the Z2 direction side.

[0034] (Coil configuration) The coil 102 is formed by joining multiple U-shaped segment coils 1. Each segment coil 1 has a coil end portion 11 located on the other axial end face 101c side (Z2 direction side) of the stator core 101. The coil end portion 11 is bent so as to protrude axially outward (Z2 direction side), which is the opposite side from the axial side of the stator core 101. Each segment coil 1 also has a pair of joint portions 10 located on one axial end face 101b side (Z1 direction side) of the stator core 101. The coil end portions 11 of the multiple segment coils 1 are arranged in a circular ring shape with the same shape continuing all around the circumference on the other end face 101c side. The coil end portions 11 of the multiple segment coils 1 are regularly arranged on the other end face 101c side. The segment coils 1 are formed from rectangular wire with a rectangular cross section.

[0035] The coil 102 is configured as a two-turn coil. Specifically, the coil 102 includes a plurality of slot-receiving portions 12 that are received in the slots 101a. Only two of the slot-receiving portions 12 are received in each slot 101a and are aligned radially.

[0036] Coil 102 is configured to generate magnetic flux by receiving three-phase AC power from a power supply (not shown), with current reciprocating in the axial direction and current flowing in the circumferential direction. Coil 102 includes a U-phase coil set 2 for the U phase, a V-phase coil set 3 for the V phase, and a W-phase coil set 4 for the W phase. Note that U-phase coil set 2, V-phase coil set 3, and W-phase coil set 4 are examples of the "second coil set," "first coil set," and "third coil set" in the claims, respectively.

[0037] 4, the U-phase coil set 2, the V-phase coil set 3, and the W-phase coil set 4 are connected (wired) by a three-phase Y connection. One end of each of the U-phase coil set 2, the V-phase coil set 3, and the W-phase coil set 4 is connected to a power supply (not shown) via a power line P. The other end of each of the U-phase coil set 2, the V-phase coil set 3, and the W-phase coil set 4 is provided with a plurality of neutral wires N.

[0038] Each of the U-phase coil set 2, the V-phase coil set 3, and the W-phase coil set 4 is configured with multiple rows (two rows) of conductor wires connected in parallel to each other and arranged on the stator core 101. As a specific example, each of the U-phase coil set 2, the V-phase coil set 3, and the W-phase coil set 4 is configured with two rows of conductor wires connected in parallel to each other. In short, the coil 102 is a coil with a so-called 2Y structure wiring connection method.

[0039] (U-phase coil set configuration) The U-phase coil set 2 shown in Figures 5 and 6 has one-end coil sections 20 in multiple rows (two rows) that are a multiple of two and are introduced into the stator core 101, and another-end coil sections 21 in multiple rows (two rows) that are arranged in the stator core 101 in the opposite circumferential direction to the one-end coil sections 20 and are led out from the stator core 101.

[0040] The one-end coil portion 20 is a portion of the U-phase coil set 2 that includes one end (winding start portion) that is introduced into the stator core 101 when the U-phase coil set 2 is arranged (wound) around the stator core 101. The one-end coil portion 20 has a pair of terminals 20a connected to the power line P and is connected to a power source (not shown) via the power line P (see FIG. 4 ). The other-end coil portion 21 is a portion of the U-phase coil set 2 that includes the other end (winding end portion) that is led out from the stator core 101 when the U-phase coil set 2 is arranged around the stator core 101. The other-end coil portion 21 has a pair of terminals 21a that are connected to the neutral conductor N. Conversely, the neutral conductor side may be the winding start portion of the U-phase coil set, and the power line P side may be the winding end portion of the U-phase coil set. As an example, the one-end coil portion 20 is wound about one turn (slightly less than one turn) around the stator core 101 in the RO1 direction in the circumferential direction. The other-end coil portion 21 is wound about one turn (slightly less than one turn) around the stator core 101 in the RO2 direction in the circumferential direction.

[0041] The one-end coil section 20 (power line side coil section) and the other-end coil section 21 (neutral line side coil section) of the U-phase coil set 2 are arranged on the stator core 101 at positions offset from each other in the circumferential direction, and the portions arranged on the stator core 101 have the same shape. As an example, the one-end coil section 20 is arranged on the stator core 101 at a position offset by 45 degrees in the RO1 direction from the other-end coil section 21.

[0042] Furthermore, the U-phase coil set 2 has, on one axial end face 101b side of the stator core 101, multiple rows (two rows) of crossover wires 22 connecting the one end side coil portion 20 and the other end side coil portion 21.

[0043] 7 and 8, a method of arranging (winding) the one-end coil portions 20 (power line side coil portions) on the stator core 101 will be described. Two or more rows (two rows) of the one-end coil portions 20 are passed from the power line P side (Z1 direction side) of the stator core 101, i.e., from the terminal 20a, through two adjacent slots 101a in the Z2 direction. In this case, the one-end coil portions 20 are passed radially outside the slots 101a.

[0044] Then, multiple rows (two rows) of one-end coil sections 20, each a multiple of two, are passed through two slots 101a in the Z1 direction, which are shifted in phase by 45 degrees in the RO1 direction from the two slots 101a through which they previously passed, via bent coil end sections 11. In this case, the one-end coil sections 20 are passed through the radially inner side of the slots 101a. This winding of the one-end coil sections 20 around the stator core 101 is repeated up to the end where the crossover wire 22 of the one-end coil section 20 is connected. The method of arranging (winding) the other-end coil sections 21 (neutral wire side coil sections) around the stator core 101 is the same as that of the one-end coil sections 20, except that the two are shifted in phase in the circumferential direction, and therefore will not be described here.

[0045] The end of the one-end coil section 20 (power line side coil section) to which the crossover wire 22 is connected is made up of two joints 10 that pass radially inside two circumferentially adjacent slots 101a and protrude in the Z1 direction. Similarly, the end of the other-end coil section 21 (neutral line side coil section) to which the crossover wire 22 is connected is made up of two joints 10 that pass radially inside two circumferentially adjacent slots 101a and protrude in the Z1 direction.

[0046] As shown in FIG. 5 , the two joints 10 of the one-end coil section 20 are arranged offset by 45 degrees in the RO1 direction relative to the two joints 10 of the other-end coil section 21. A plurality of rows (two rows) of crossover wires 22, each a multiple of two, connect the two joints 10 of the one-end coil section 20 to the two joints 10 of the other-end coil section 21. Specifically, each of the two rows of crossover wires 22 is provided at both ends of the crossover wire 22 and is formed in a U-shape with a pair of joints 10 facing outward in the axial direction (Z1 direction), which is the side opposite the stator core 101. The joints 10 of the two rows of crossover wires 22 in the RO1 direction are abutted against and joined to the two joints 10 of the one-end coil section 20 (power line side coil section) from the radially inner side. The joints 10 in the RO2 direction of the two rows of crossover wires 22 are joined by being brought into contact with the two joints 10 of the other end side coil portion 21 (neutral wire side coil portion) from the radially inner side.

[0047] The inner two circumferentially of the two joints 10 of the one-end coil portion 20 and the two joints 10 of the other-end coil portion 21 are connected by a small U-shaped crossover wire 22. The outer two circumferentially of the two joints 10 of the one-end coil portion 20 and the two joints 10 of the other-end coil portion 21 are connected by a large U-shaped crossover wire 22 that surrounds the small U-shaped crossover wire 22 from the stator core 101 side and both sides in the circumferential direction.

[0048] In the U-phase coil set 2, the multiple rows (two rows) of crossover wires 22 that are a multiple of two extend in an arc shape in the circumferential direction when viewed in the axial direction. In the U-phase coil set 2, the multiple rows (two rows) of crossover wires 22 that are a multiple of two overlap when viewed in the axial direction. That is, the multiple rows (two rows) of crossover wires 22 that are a multiple of two have the same radial extent. That is, the positions of the radially outer end faces of the multiple rows (two rows) of crossover wires 22 that are a multiple of two coincide with each other. Furthermore, the positions of the radially inner end faces of the multiple rows (two rows) of crossover wires 22 that are a multiple of two coincide with each other.

[0049] The multiple rows of crossover wires 22 of the U-phase coil set 2 are arranged at the innermost circumferential position among the coils 102. Specifically, the multiple rows of crossover wires 22 of the U-phase coil set 2 are arranged further radially inward than the radially inner slot-accommodating portions 12. The multiple rows of crossover wires 22 of the U-phase coil set 2 are arranged to protrude radially inward beyond the inner circumferential end face 101d of the stator core 101. In other words, the multiple rows of crossover wires 22 of the U-phase coil set 2 are arranged to overlap with the rotor when viewed in the axial direction.

[0050] (W-phase coil set configuration) 5 and 6, U-phase coil set 2 and W-phase coil set 4 are arranged on stator core 101 at positions offset from each other in the circumferential direction, and the portions arranged on stator core 101, excluding crossover wires 22 and 42, have the same shape. Crossover wire 22 of U-phase coil set 2 also has the same shape as crossover wire 42 of W-phase coil set 4. As an example, W-phase coil set 4 is arranged on stator core 101 at a position offset by 60 degrees in the RO1 direction from U-phase coil set 2. The circumferential extent of W-phase coil set 4 and U-phase coil set 2 is smaller than 60 degrees. W-phase coil set 4 has the same configuration (shape) as U-phase coil set 2, so it will only be briefly described below.

[0051] The W-phase coil set 4 includes a plurality of rows of one-end coil sections 40 (power line side coil sections) introduced into the stator core 101, a plurality of rows of other-end coil sections 41 (neutral line side coil sections) arranged in the opposite circumferential direction to the one-end coil sections 40 on the stator core 101 and extending from the stator core 101, and a plurality of rows of crossover wires 42 connecting the one-end coil sections 40 and the other-end coil sections 41 on one axial end face 101b of the stator core 101. The one-end coil sections 40 have a pair of terminals 40a connected to the power line P and are connected to a power source (not shown) via the power line P (see FIG. 4). The other-end coil sections 41 have a pair of terminals 41a connected to the neutral line N.

[0052] The one end coil portion 40 and the other end coil portion 41 of the W-phase coil set 4 are arranged relative to the stator core 101 at positions offset from each other in the circumferential direction, and the portions arranged on the stator core 101 have the same shape.

[0053] In the W-phase coil set 4, multiple rows of crossover wires 42 (two rows) that are a multiple of two overlap each other when viewed in the axial direction. The multiple rows of crossover wires 42 in the W-phase coil set 4 are arranged at the innermost circumferential position among the coils 102. Specifically, the multiple rows of crossover wires 42 in the W-phase coil set 4 are arranged further radially inward than the radially inner slot-accommodating portions 12. The multiple rows of crossover wires 42 in the W-phase coil set 4 are arranged to protrude radially inward beyond the inner circumferential end face 101d of the stator core 101. In the radial direction, the extent of the crossover wires 42 in the W-phase coil set 4 coincides with the extent of the crossover wires 42 in the U-phase coil set 2.

[0054] (V-phase coil set configuration) 6 and 9, U-phase coil set 2 and V-phase coil set 3 are arranged on stator core 101 at positions offset from each other in the circumferential direction, and the portions arranged on stator core 101, excluding crossover wires 22 and 32, have the same shape. Note that crossover wire 22 of U-phase coil set 2 has a different shape from crossover wire 32 of V-phase coil set 3. As an example, V-phase coil set 3 is arranged on stator core 101 at a position offset by 30 degrees in the RO1 direction from U-phase coil set 2. Furthermore, V-phase coil set 3 is arranged on stator core 101 at a position offset by 30 degrees in the RO2 direction from W-phase coil set 4. V-phase coil set 3 has the same configuration (shape) as U-phase coil set 2, excluding crossover wire 32 of V-phase coil set 3, and will therefore only be briefly described below.

[0055] The V-phase coil set 3 includes a plurality of rows of one-end coil sections 30 (power line side coil sections) introduced into the stator core 101, a plurality of rows of other-end coil sections 31 (neutral line side coil sections) arranged in the opposite circumferential direction to the one-end coil sections 30 on the stator core 101 and extending from the stator core 101, and a plurality of rows of crossover wires 32 connecting the one-end coil sections 30 and the other-end coil sections 31 on one axial end face 101b of the stator core 101. The one-end coil sections 30 have a pair of terminals 30a connected to the power line P and are connected to a power source (not shown) via the power line P (see FIG. 4). The other-end coil sections 31 have a pair of terminals 31a connected to the neutral line N.

[0056] The one end coil portion 30 and the other end coil portion 31 of the V-phase coil set 3 are arranged relative to the stator core 101 at positions offset from each other in the circumferential direction, and the portions arranged on the stator core 101 have the same shape.

[0057] In the V-phase coil set 3, multiple rows of crossover wires 32 that are a multiple of two (two rows) overlap when viewed in the axial direction. The multiple rows of crossover wires 32 in the V-phase coil set 3 are arranged at the outermost positions of the coils 102. In detail, the multiple rows of crossover wires 32 in the V-phase coil set 3 are arranged at the same positions in the radial direction as the slot-accommodated portions 12 on the radially outer side.

[0058] The crossover wire 32 of the V-phase coil set 3 and the crossover wire 22 of the U-phase coil set 2 overlap in the radial direction. Also, the crossover wire 32 of the V-phase coil set 3 and the crossover wire 42 of the W-phase coil set 4 overlap in the radial direction.

[0059] Specifically, the crossover wire 32 of the V-phase coil set 3 overlaps with the crossover wire 22 of the U-phase coil set 2 on one circumferential side (RO2 direction side) as viewed in the radial direction, and overlaps with the crossover wire 32 of the V-phase coil set 3 on the other circumferential side (RO1 direction side) as viewed in the radial direction. Note that the crossover wire 22 of the U-phase coil set 2 and the crossover wire 42 of the W-phase coil set 4 do not overlap with each other as viewed in the radial direction.

[0060] As an example, the range in the circumferential direction over which the terminals 20a, 21a, 30a, 31a, 40a, and 41a of the coil 102 are located is smaller than 180 degrees. More specifically, the range in the circumferential direction over which the terminals 20a, 21a, 30a, 31a, 40a, and 41a of the coil 102 are located is smaller than 120 degrees.

[0061] (Effects of this embodiment) The structure of the above embodiment can provide the following effects.

[0062] In this embodiment, as described above, each of the V-phase coil set 3 and the U-phase coil set 2 has multiple rows of one-end coil sections 30, 20 that are introduced into the stator core 101, multiple rows of other-end coil sections 31, 21 that are arranged in the stator core 101 in the opposite circumferential direction to the one-end coil sections 30, 20 and are led out from the stator core 101, and multiple rows of crossover wires 32, 22 that are multiples of two that connect the one-end coil sections 30, 20 and the other-end coil sections 31, 21 on the axial end face 101b side of the stator core 101. This allows the one-end coil portions 30, 20 and the other-end coil portions 31, 21 to be formed as separate members from the crossover wires 32, 22. Simply joining the one-end coil portions 30, 20 and the other-end coil portions 31, 21 to the crossover wires 32, 22 eliminates the need to provide bent portions at the connection points between the one-end coil portions 30, 20 and the other-end coil portions 31, 21. Furthermore, in each of the V-phase coil set 3 and the U-phase coil set 2, the multiple rows of crossover wires 32, 22 overlap in the axial direction. This reduces the radial size of the multiple rows of crossover wires 32, 22, which are perpendicular to the axial direction. This reduces the radial size of the coil 102 at the connection points between the one-end coil portions 30, 20 and the other-end coil portions 31, 21. Additionally, the multiple rows of crossover wires 32 of the V-phase coil set 3 and the multiple rows of crossover wires 22 of the U-phase coil set 2 are respectively arranged at the outermost and innermost positions of the coils 102. Here, the V-phase coil set 3 and the U-phase coil set 2 are provided with terminals 20a, 21a, 30a, 31a to be connected to the power line P or the like.Furthermore, by configuring as described above, the multiple rows of jumper wires 32 of the V-phase coil set 3 at the outermost position and the multiple rows of jumper wires 22 of the U-phase coil set 2 at the innermost position can be distributed and arranged on the inner and outer sides, so that the multiple rows of jumper wires 32 of the V-phase coil set 3 and the multiple rows of jumper wires 22 of the U-phase coil set 2 can be arranged overlapping each other in the circumferential direction, and the terminals 20a, 21a, 30a, 31a connected to the power lines P of the V-phase coil set 3 and the U-phase coil set 2 can be arranged together in the circumferential direction.

[0063] In this embodiment, as described above, the crossover wire 32 of the V-phase coil set 3 and the crossover wire 22 of the U-phase coil set 2 overlap in the radial direction. This allows the crossover wire 32 of the V-phase coil set 3 at the outermost position and the crossover wire 22 of the U-phase coil set 2 at the innermost position to be arranged overlapping in the circumferential direction, allowing the terminals 20a, 21a, 30a, 31a connected to the power lines P of the V-phase coil set 3 and the U-phase coil set 2 to be arranged more closely together in the circumferential direction.

[0064] In this embodiment, as described above, the coil 102 has a plurality of rows of one-end side coil portions 40, each of which is a multiple of two, that are introduced into the stator core 101, a plurality of rows of other-end side coil portions 41, each of which is arranged in the stator core 101 in the circumferentially opposite direction to the one-end side coil portions 40 and that are led out from the stator core 101, and a plurality of rows of crossover wires 42, each of which is a multiple of two, that connect the one-end side coil portions 40 and the other-end side coil portions 41 on the one end face 101b side of the stator core 101 in the axial direction. The third phase W-phase coil set 4 further includes a plurality of rows (a multiple of two) of third-phase W-phase coil sets 4 arranged on stator core 101 in a state of being connected in parallel with the third phase W-phase coil sets 4, the plurality of rows of crossover wires 42 of W-phase coil set 4 being arranged at the innermost circumferential position among coils 102, and the crossover wires 32 of V-phase coil set 3 overlap with the crossover wires 22 of U-phase coil set 2 on one circumferential side as seen in the radial direction, and overlap with the crossover wires 42 of W-phase coil set 4 on the other circumferential side as seen in the radial direction. This allows the crossover wires 32 of V-phase coil set 3 at the outermost circumferential position to be arranged overlapping with the crossover wires 22 of U-phase coil set 2 at the innermost circumferential position on one circumferential side, and allows the crossover wires 32 of V-phase coil set 3 at the outermost circumferential position to be arranged overlapping with the crossover wires 42 of W-phase coil set 4 at the innermost circumferential position on the other circumferential side. As a result, the terminals 20a, 21a, 30a, 31a, 40a, 41a connected to the power lines P of the V-phase coil set 3, the U-phase coil set 2, and the W-phase coil set 4 can be arranged more closely together in the circumferential direction.

[0065] In the present embodiment, as described above, the multiple rows of crossover wires 22 of the U-phase coil set 2 are arranged to protrude radially inward from the inner peripheral end face 101d of the stator core 101. By arranging the multiple rows of crossover wires 22 of the U-phase coil set 2 to protrude radially inward from the inner peripheral end face 101d of the stator core 101, a relatively large space can be secured on the outer peripheral side from which the coils 102 are normally drawn for connection to the power lines P.

[0066] In this embodiment, as described above, the crossover wires 22 (32, 42) are formed in a U-shape with a pair of joints 10 provided at both ends of the crossover wire 22 and facing outward in the axial direction, opposite the stator core 101 side. This allows the crossover wires 22 to be formed in a U-shape with a pair of joints 10 provided at both ends of the crossover wire 22 and facing outward in the axial direction, opposite the stator core 101 side, thereby preventing the crossover wires 22 from protruding from the joints 10 to the side opposite the stator core 101 side. This allows the size of the coils 102 in the axial direction to be reduced.

[0067] In this embodiment, as described above, the coil 102 further includes a plurality of slot-receiving portions 12 received in the slots 101a, and only two of the slot-receiving portions 12 are received in each slot 101a and aligned radially. This allows the radial size of the coil 102, which is made of a relatively thick conductor, to be reduced.

[0068] In this embodiment, as described above, the coil 102 is formed by joining multiple U-shaped segment coils 1, and each segment coil 1 is arranged on the other axial end face 101c side of the stator core 101 and has a coil end portion 11 bent to protrude axially outward, opposite the axial side of the stator core 101, and a pair of joint portions 10 arranged on one axial end face 101b side of the stator core 101, and the coil end portions 11 of the multiple segment coils 1 are arranged in a circular ring shape with the same shape continuing all around the circumference on the other end face 101c side. This allows the bent coil end portions 11 on the other end face 101c side to be arranged in a circular ring shape with the same shape continuing all around the circumference, thereby preventing the occurrence of localized irregular shapes on the other end face 101c side, which would increase the radial size of the coil 102.

[0069] In this embodiment, as described above, the one-end coil portions 30, 20 and the other-end coil portions 31, 21 of each of the V-phase coil set 3 and the U-phase coil set 2 are arranged at positions offset from each other in the circumferential direction relative to the stator core 101, and the portions arranged on the stator core 101 have the same shape. This allows the one-end coil portions 30, 20 and the other-end coil portions 31, 21 of each of the V-phase coil set 3 and the U-phase coil set 2 to be arranged on the stator core 101 in the same procedure, thereby facilitating the work of arranging the coils 102.

[0070] In this embodiment, as described above, the V-phase coil set 3, the U-phase coil set 2, and the W-phase coil set 4 are arranged on the stator core 101 at positions offset from one another in the circumferential direction, and the portions arranged on the stator core 101 have the same shape, excluding the crossover wires 22, 32, and 42. This allows the V-phase coil set 3, the U-phase coil set 2, and the W-phase coil set 4 to be arranged on the stator core 101 in the same procedure, excluding the crossover wires 22, 32, and 42, thereby facilitating the work of arranging the coils 102.

[0071] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims rather than the above description of the embodiments, and further includes all modifications (variations) within the meaning and scope of the claims.

[0072] For example, in the above embodiment, the stator is formed of three-phase coils, but the present invention is not limited to this. In the present invention, the stator may be formed of two-phase coils or the like.

[0073] In the above embodiment, each of the U-phase, V-phase, and W-phase coil sets includes two crossover wires in the axial direction of the stator core, but the present invention is not limited to this. In the present invention, each of the U-phase, V-phase, and W-phase coil sets may include a plurality of crossover wires other than two, as long as the coils have a so-called 2Y structure.

[0074] In addition, in the above embodiment, the U-phase coil set, the V-phase coil set, and the W-phase coil set are arranged with a circumferential offset of 30 degrees, but the present invention is not limited to this. In the present invention, the U-phase coil set, the V-phase coil set, and the W-phase coil set may be arranged with a circumferential offset of an angle other than 30 degrees.

[0075] In the above embodiment, an example is shown in which the jumper wire of one coil set is arranged at the outermost peripheral position of the coil and the jumper wires of two coil sets are arranged at the innermost peripheral position of the coil, but the present invention is not limited to this. In the present invention, the jumper wires of two coil sets may be arranged at the outermost peripheral position of the coil and the jumper wire of one coil set may be arranged at the innermost peripheral position of the coil.

[0076] In addition, in the above embodiment, an example was shown in which a two-turn coil was provided with only two slot-receiving portions arranged in one slot, but the present invention is not limited to this. In the present invention, a coil may be provided with three or more slot-receiving portions arranged in one slot. [Explanation of symbols]

[0077] 1: Segment coil, 2: U-phase coil set (second coil set), 3: V-phase coil set (first coil set), 4: W-phase coil set (third coil set), 10: Joint 11: coil end portion, 12: slot accommodating portion, 20: one end coil portion (of U-phase coil set), 21: other end coil portion (of U-phase coil set), 22: jumper wire (of U-phase coil set), 30: one end coil portion (of V-phase coil set), 31: other end coil portion (of V-phase coil set), 32: jumper wire (of V-phase coil set), 40: one end coil portion (of W-phase coil set), 41: other end coil portion (of W-phase coil set), 42: jumper wire (of W-phase coil set), 100: stator, 101: stator core, 101a: slot (of stator core), 101b: one end face (of stator core), 101c: other end face (of stator core), 101d: inner peripheral end face (of stator core), 102: coil

Claims

1. a stator core including a plurality of slots extending in an axial direction and arranged in a circumferential direction; a first coil set of a first phase with a number of rows that is a multiple of two and arranged on the stator core in a state of being connected in parallel to each other, and a second coil set of a second phase with a number of rows that is a multiple of two and arranged on the stator core in a state of being connected in parallel to each other, the first coil set being formed of a flat wire; Each of the first coil set and the second coil set comprises: a plurality of rows of one-end side coil portions, the number of which is a multiple of two, introduced into the stator core; a plurality of rows of second-end coil portions, the number of rows being a multiple of two, that are arranged on the stator core in a circumferentially opposite direction to the first-end coil portions and that are led out from the stator core; a plurality of rows of crossover wires, the number of which is a multiple of two, connecting the one end side coil portion and the other end side coil portion on one end surface side in the axial direction of the stator core, In each of the first coil set and the second coil set, the rows of crossover wires overlap each other when viewed in the axial direction, a stator in which the rows of jumper wires of the first coil set and the rows of jumper wires of the second coil set are respectively arranged at the outermost and innermost positions of the coils.

2. The stator according to claim 1 , wherein the crossover wires of the first coil set and the crossover wires of the second coil set overlap each other when viewed in the radial direction.

3. the coils include a first end coil portion having a number of rows that is a multiple of two that is introduced into the stator core, a second end coil portion having a number of rows that is a multiple of two that is arranged in the stator core in a circumferentially opposite direction to the first end coil portion and that is led out from the stator core, and a number of crossover wires that are a multiple of two that connect the first end coil portion and the second end coil portion at the one end face side in the axial direction of the stator core, and further include a third coil set of a third phase having a number of rows that is a multiple of two that are arranged in the stator core in a state of being connected in parallel to each other, the plurality of rows of crossover wires of the third coil set are arranged at the innermost circumferential position among the coils; 3. The stator according to claim 2, wherein the crossover wire of the first coil set overlaps with the crossover wire of the second coil set on one circumferential side as viewed in the radial direction, and overlaps with the crossover wire of the third coil set on the other circumferential side as viewed in the radial direction.

4. The stator according to claim 1 , wherein the rows of crossover wires of the second coil set are arranged to protrude radially inward beyond an inner peripheral end face of the stator core.

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