JP2015177725A - rotary electric machine coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine coil capable of suppressing small a maximum potential difference between different-phase coils in a spiral coil end portion when forming the coil end portion.SOLUTION: A target concentric winding part 40a is a concentric winding part to be wound around a target slot 12a in which a coil side connectable to a connection terminal 90 is disposed. The target concentric winding part 40a is disposed so as not to include a concentric winding part of the same phase but is not the target concentric winding part 40a, in a circumferential direction between the target concentric winding part 40a and another target concentric winding part 40a of the same phase. An arrangement pattern of the target slot 12a of multiple phases is set to a pattern that minimizes variance in the circumferential direction C between target concentric winding parts 40a of phases different from each other and being adjacent in the circumferential direction C, among a plurality of arrangement patterns that make the order of arranging phases in the circumferential direction C for the target slot 12a of multiple phases equal to the order of arranging phases in the circumferential direction C for a slot 12 of multiple phases.

Description

  In the present invention, N slots (N represents a positive multiple of 4) are wound around a core formed with the same number of slots for each phase along the circumferential direction and distributed in the circumferential direction. The present invention relates to a rotating electrical machine coil in which a plurality of phase coils having concentric windings are star-connected.

  As a coil for a rotating electrical machine as described above, one described in Japanese Patent Application Laid-Open No. 2009-278845 (Patent Document 1) is known. Patent Document 1 discloses a technique for setting all the circumferential intervals of the first coils of mutually different phases adjacent in the circumferential direction to 120 degrees in order to suppress the maximum potential difference between the adjacent different-phase coils in the coil end portion. Have been described. The first coil is a concentric winding part connected to a power line (lead wire).

JP 2009-278845 A (FIG. 1 etc.)

  By the way, the shape of the transition portion forming the coil end portion is arranged on the inner side in the radial direction with respect to the transition portion of the other phase at the same position in the circumferential direction on one side in the circumferential direction, and on the other side in the circumferential direction. Is known to have a shape that is arranged on the outer side in the radial direction with respect to the transition part of the other phase at the same position in the circumferential direction. In this case, the coil end portion can be reduced in size by making the shape of the coil end portion viewed in the axial direction spiral. In order to form such a spiral coil end portion, it is generally necessary to wind a plurality of phase coils together around a core. Therefore, compared with the case where the transition part of each phase is divided and arranged in the radial region set for each phase as in Patent Document 1, the first coil is formed when the spiral coil end part is formed. There are cases where it is easy to increase the manufacturing restrictions on the positions in the circumferential direction, and it is not practical to set all the circumferential intervals of the first coils of mutually different phases adjacent to the circumferential direction to 120 degrees. is there. However, in Patent Document 1, no particular recognition has been made on this point.

  Therefore, when a spiral coil end portion is formed, it is desired to realize a coil for a rotating electrical machine that can suppress a maximum potential difference between different-phase coils at the coil end portion.

  According to the present invention, the slots for each phase are wound around the core repeatedly formed along the circumferential direction of the cylindrical core reference surface, and N pieces (N is distributed) are arranged in the circumferential direction. (Representing a positive multiple of 4), a characteristic configuration of a coil for a rotating electrical machine in which a plurality of phase coils having a concentric winding portion are star-connected is such that the concentric winding portion is disposed in the slot. And a crossing portion connecting the pair of coil side portions on the outside of the core in the axial direction of the core reference plane, the crossing portion in the circumferential direction on one side of the circumferential direction. It is arranged on the inner side in the radial direction of the core reference surface with respect to the transition part of the other phase at the same position, and on the transition part of the other phase at the same position in the circumferential direction on the other side of the circumferential direction. Against the outside in the radial direction, Each of the coils includes a plurality of the concentric winding parts connected in series with each other, and includes one or more series coil parts having one end connected to a neutral point and the other end connected to a connection terminal. Among the plurality of slots in which the coil part is arranged, the target slot which is the slot in which the coil side part closest to the connection terminal is arranged has the coil side part connectable to the connection terminal. The target concentric winding part, which is the concentric winding part that is set from among the plurality of slots and is wound around the target slot, is disposed between the target and the other target concentric winding part in the circumferential direction. Arranged so as not to include the concentric winding portions of the same phase that are not concentric winding portions, the arrangement pattern of the target slots of a plurality of phases is the arrangement order of the phases in the circumferential direction of the target slots of the plurality of phases is the plurality of phases Among a plurality of arrangement patterns that are equal to the order of arrangement of the phases in the circumferential direction of the lot, a pattern in which the dispersion of the circumferential intervals of the target concentric winding portions of different phases adjacent to each other in the circumferential direction is the smallest It is in the set point.

According to the above characteristic configuration, the arrangement pattern of the target slots of the plurality of phases has a plurality of phases in which the order of phases in the circumferential direction of the target slots of the plurality of phases is equal to the order of phases in the circumferential direction of the slots of the plurality of phases. In the arrangement pattern, since the dispersion of the circumferential spacing of the adjacent concentric winding portions of different phases adjacent in the circumferential direction is set to be the smallest, the adjacent concentric winding portions of different phases adjacent in the circumferential direction It is possible to ensure a large overall circumferential interval. Therefore, the concentric winding part of the other phase in which the circumferential arrangement region overlaps the target concentric winding part that is the concentric winding part on the most connected terminal side in the series coil part is arranged on the side close to the neutral point in the series coil part. It can be set as a concentric winding part, and the maximum electric potential difference of the said phase coil in the part by which two mutually different phase coils are arrange | positioned or contacted in the coil end part can be restrained small. As a result, when the spiral coil end portion is formed, a rotating electrical machine coil that can suppress the maximum potential difference between the different-phase coils in the coil end portion can be realized.
In addition, according to said characteristic structure, since the maximum electric potential difference between the different phase coils in a coil end part can be restrained small, for example, the insulation performance requested | required of an interphase insulating member is reduced, or an interphase insulating member is provided. It is possible to ensure the electrical insulation between the phase coils of each phase with only the insulating film formed on the surface of the conductor wire constituting the linear conductor, which reduces the manufacturing cost of the rotating electrical machine and reduces the coil end. It is possible to reduce the size of the part.

  Here, each of the series coil portions is configured by connecting a plurality of coil units having a plurality of concentric winding portions formed by winding a continuous linear conductor at a plurality of locations, and in the circumferential direction. The coil units of a plurality of phases arranged in the same region are arranged units when arranged in the core, or arranged units when arranged in a coil holder as preparation before arranging in the core, Each of the two coil side portions arranged on the most end side of the coil unit among the plurality of coil side portions included in the coil unit is the coil side portion connectable to the connection terminal. Is preferred.

  According to this configuration, the coil side that can be connected to the connection terminal is limited to the specific coil side, but even in such a case, as described above, the arrangement pattern of the target slots of the plurality of phases Among the plurality of arrangement patterns in which the phase arrangement order in the circumferential direction of the phase target slots is the same as the phase arrangement order in the circumferential direction of the plurality of phase slots, the target concentric windings of different phases adjacent in the circumferential direction are arranged. By setting the pattern in which the dispersion in the circumferential interval is the smallest, the maximum potential difference between the different-phase coils in the coil end portion can be kept small. Moreover, according to said structure, since each of a phase coil can be connected to a connection terminal, without cutting | disconnecting the connection conducting wire which connects the concentric winding parts in a coil unit, the manufacturing process of a rotary electric machine is simplified. Can also be planned.

It is a perspective view of the stator which concerns on embodiment of this invention. It is a connection diagram of the coil which concerns on embodiment of this invention. It is the schematic diagram seen from the axial direction of the stator which concerns on embodiment of this invention. It is a schematic diagram which shows the arrangement | positioning state of the coil unit group which concerns on embodiment of this invention. It is a figure which shows the coil unit which concerns on embodiment of this invention. It is a schematic block diagram of the coil holder which concerns on embodiment of this invention. It is a schematic diagram which shows the arrangement | positioning state of the coil unit group which concerns on a comparative example. It is the schematic diagram seen from the axial direction of the stator which concerns on other embodiment of this invention. It is the schematic diagram seen from the axial direction of the stator which concerns on other embodiment of this invention.

  An embodiment of a coil for a rotating electrical machine according to the present invention will be described with reference to the drawings. Here, the case where the coil for rotating electrical machines according to the present invention is applied to a coil 1 wound around a core 11 (stator core) of a stator 10 for rotating electrical machines as shown in FIG. 1 will be described as an example. The “rotary electric machine” is used as a concept including any of a motor (electric motor), a generator (generator), and a motor / generator functioning as both a motor and a generator as necessary.

  In the following description, unless otherwise specified, the “axial direction L”, “circumferential direction C”, and “radial direction R” are based on the cylindrical core reference plane S, in other words, The axis A of the core reference plane S is defined as a reference (see FIGS. 1 and 3). “Axial first direction L1” represents a direction toward one side in the axial direction L, and “Axial second direction L2” represents a direction toward the other side in the axial direction L (a direction opposite to the axial first direction L1). Represents. The “circumferential first direction C1” represents a direction toward one side in the circumferential direction C, and the “circumferential second direction C2” represents a direction toward the other side in the circumferential direction C (a direction opposite to the circumferential first direction C1). Represents. As shown in FIG. 1, in this embodiment, the clockwise direction when viewed along the axial direction L from the first axial direction L1 side is set to the first circumferential direction C1. Further, in this specification, terms relating to dimensions, arrangement direction, arrangement position, etc. (for example, parallel or orthogonal) are used as a concept including a state having a difference due to an error (an error that is acceptable in manufacturing). .

1. Overall Structure of Stator The stator 10 is a stator for a rotating electrical machine, and includes a core 11 and a coil 1 wound around the core 11 as shown in FIG. In FIG. 1, only a part of the coil 1 is shown for simplification. The core 11 is formed using a magnetic material. For example, a core 11 is formed by laminating a plurality of magnetic plates (for example, electromagnetic steel plates such as silicon steel plates), or a powder material formed by pressing a magnetic material powder is a main component. As a result, the core 11 is formed. The stator 10 is a stator for a rotating field type rotating electrical machine, and functions as an armature. A magnetic field generated from the stator 10 rotates a rotor (not shown) as a field including a permanent magnet or an electromagnet. The rotor is disposed inside the radial direction R with respect to the core 11.

  The core 11 has a plurality of slots 12 distributed in the circumferential direction C. The plurality of slots 12 are arranged at regular intervals along the circumferential direction C. Each of the slots 12 is formed to extend in the axial direction L and the radial direction R. In the present embodiment, each of the slots 12 has openings on both sides in the axial direction L and has openings on the inner side in the radial direction R. Teeth 13 are formed between slots 12 adjacent to each other in the circumferential direction C, and the inner peripheral surface of the core 11 is formed by a cylindrical virtual surface including the inner end surfaces of the plurality of teeth 13 in the radial direction R. The In the present embodiment, the inner peripheral surface of the core 11 is the core reference surface S. The outer surface (outer peripheral surface) in the radial direction R of the core 11 may be used as the core reference surface S.

  The coil 1 is a multi-phase coil, and the same number of slots 12 for each phase are repeatedly formed in the core 11 along the circumferential direction C. In the present embodiment, the coil 1 is a three-phase coil, and includes three phase coils 2 including a U-phase coil 2U, a V-phase coil 2V, and a W-phase coil 2W. Correspondingly, the same number of U-phase, V-phase, and W-phase slots 12 are repeatedly formed along the circumferential direction C in the core 11. In the present embodiment, the arrangement order of the phases in the circumferential direction C of the multiple-phase slots 12 that are repeatedly formed along the circumferential direction C is the U phase toward the circumferential first direction C1 when the U phase is the starting point. , V phase, W phase. In the present embodiment, the number of slots per phase per pole is “2”, and the core 11 is arranged such that two slots 12 for each phase appear repeatedly along the circumferential direction C. In the present embodiment, the number of magnetic poles per phase is “16” (the number of magnetic pole pairs is “8”), and 96 (= 2 × 16 × 3) slots 12 are arranged in the core 11 in total. ing.

2. Next, the configuration of the coil 1, which is a main part of the present invention, will be described. The coil 1 is configured using a linear conductor 3 (see FIG. 5) which is a linear conductor. The linear conductor 3 is made of a conductive material such as copper or aluminum. The linear conductor 3 is composed of one conductor wire or a bundle of a plurality of conductor wires. As such a conductor wire, for example, a conductor wire having a circular cross section orthogonal to the extending direction can be used. An insulating film made of a material having electrical insulation properties such as resin is formed on the surface of the conductor wire.

  As shown in FIG. 2, the coil 1 is configured by star-connecting a plurality of phase coils 2 (in this example, a U-phase coil 2U, a V-phase coil 2V, and a W-phase coil 2W). That is, one end of each of the phase coils 2 is connected to a connection terminal 90 set for each phase, and the other end of each of the phase coils 2 is connected to each other at a neutral point 91. The connection terminal 90 is a terminal for connecting the coil 1 to a device (for example, an inverter) that exchanges power with the stator 10. That is, a lead wire (power line) is connected to the connection terminal 90. When the rotating electrical machine is powered, electric power is input to the connection terminal 90 from the device side. In this embodiment, as the connection terminal 90, a U-phase connection terminal 90U, a V-phase connection terminal 90V, and a W-phase connection terminal 90W corresponding to each of the three phases are provided. In the present embodiment, each of the multiple-phase connection terminals 90 is disposed on the first axial direction L1 side with respect to the core 11.

  As shown in FIG. 2, the phase coil 2 includes a plurality of concentric winding portions 40. The concentric winding part 40 is a coil part (overlapping part) formed by winding the linear conductor 3 (see FIG. 5) between a pair or a plurality of pairs of slots 12. In the present embodiment, the concentric winding portion 40 is disposed between the pair of slots 12 (in this example, between the pair of slots 12 separated from each other by 5 times the slot pitch (arrangement pitch of the slots 12)). Is wound a plurality of times. The concentric winding part 40 includes a coil side part 60 (see FIG. 1) disposed in the slot 12 and a transition part 61 that connects the pair of coil side parts 60 outside the core 11 in the axial direction L. In FIG. 3 and FIG. 4 referred later, the crossing portions 61 of the respective phases are differently hatched for easy understanding of the invention. Specifically, only the transition part 61 of the W-phase coil 2W and the transition part 61 of the U-phase coil 2U are hatched, and moreover the transition part 61 of the U-phase coil 2U than the transition part 61 of the W-phase coil 2W. It has dark hatching. As shown in FIG. 1, a coil end portion 62, which is a portion of the coil 1 that protrudes in the axial direction L from the core 11, is formed by the assembly of the transition portions 61 of each phase.

  Each of the phase coils 2 includes one or a plurality of series coil portions 20 configured by connecting a plurality of concentric winding portions 40 in series with each other. One end of the series coil unit 20 is connected to the neutral point 91, and the other end of the series coil unit 20 is connected to the connection terminal 90. Here, the total number of concentric winding portions 40 included in the series coil portion 20 is X, and a plurality of concentric winding portions 40 included in the series coil portion 20 are arranged in order from the connection terminal 90 side, the first coil portion, the second coil portion,. .., X-th coil part. In this embodiment, X is “8”, and each of the series coil portions 20 includes a first coil portion 51, a second coil portion 52, a third coil portion 53, a fourth coil portion 54, and a fifth coil portion 55. The sixth coil part 56, the seventh coil part 57, and the eighth coil part 58 are provided.

  In the present embodiment, each of the phase coils 2 includes a plurality of series coil portions 20 connected in parallel to each other as shown in FIG. In FIG. 2, the V-phase coil 2V and the W-phase coil 2W are shown in a simplified manner, but each of the V-phase coil 2V and the W-phase coil 2W is also connected in parallel to each other in the same manner as the U-phase coil 2U. A plurality of series coil portions 20 are provided. In the present embodiment, the number of series coil units 20 connected in parallel to each other is “4”, and each of the phase coils 2 includes a first series coil unit 21, a second series coil unit 22, and a third series coil unit. 23 and four series coil portions 20 of the fourth series coil portion 24 are provided.

  In the present embodiment, the series coil portion 20 is configured by alternately connecting concentric winding portions 40 whose winding directions are opposite to each other in series. In addition, the winding direction of the two concentric winding portions 40 is opposite along the extending direction of the linear conductor 3 constituting the phase coil 2 (in other words, along the direction of the current flowing through the phase coil 2). When going from one end of the phase coil 2 to the other end, it means that one concentric winding 40 is wound in the clockwise direction and the other concentric winding 40 is wound in the counterclockwise direction. . Therefore, the concentric winding portions 40 whose winding directions are opposite to each other form magnetic poles that are opposite to each other when the coil 1 is energized.

  As shown in FIG. 3, each of the phase coils 2 includes N concentric winding portions 40 (N represents a positive multiple of 4) distributed in the circumferential direction C. N is the number of magnetic poles per phase, and is set to “16” in this embodiment. The N concentric winding portions 40 included in one phase coil 2 are arranged for each magnetic pole pitch along the circumferential direction C so that arrangement regions in the circumferential direction C do not overlap each other. In the present embodiment, the magnetic pole pitch P is six times the slot pitch. When a set of N concentric winding portions 40 distributed in the circumferential direction C is referred to as a “coil set”, the coil sets of each phase are in a positional relationship shifted from each other in the circumferential direction C in the same region in the radial direction R. Has been placed. In the present embodiment, each of the phase coils 2 includes a plurality of coil sets arranged in different regions in the radial direction R. Specifically, each of the phase coils 2 includes an outer coil set in which the coil side portion 60 is disposed on the bottom side (outside in the radial direction R) of the slot 12, and the coil side portion 60 is the opening portion of the slot 12. Two coil sets are provided, including an inner coil set disposed on the side (inner side in the radial direction R). In FIG. 4 referred to later, only a part of each outer coil set of the phase coil 2 is shown. The outer coil set and the inner coil set included in one phase coil 2 are configured similarly except for the arrangement position in the radial direction R.

  As schematically shown in FIG. 3, the crossover portion 61 is connected to the crossover portion 61 of another phase at the same position in the circumferential direction C on one side in the circumferential direction C (in this example, the circumferential first direction C1 side). In the radial direction R, the radial direction relative to the crossing portion 61 of the other phase at the same position in the circumferential direction C on the other side in the circumferential direction C (in the second circumferential direction C2 side in this example). Arranged outside of R. In addition, such an arrangement relationship between the transition portions 61 of the respective phases is established between the coil sets of the respective phases arranged in the same region in the radial direction R. That is, in this embodiment, since each of the phase coils 2 includes an outer coil set and an inner coil set, the transition part 61 of the outer coil set is at the same position in the circumferential direction C on one side in the circumferential direction C. It is arranged on the inner side in the radial direction R with respect to the transition portion 61 of the outer coil set of the other phase, and on the transition portion 61 of the outer coil set of the other phase at the same position in the circumferential direction C on the other side in the circumferential direction C. On the other hand, it is arranged outside the radial direction R. Further, the transition portion 61 of the inner coil set is disposed on the inner side in the radial direction R with respect to the transition portion 61 of the inner coil set of the other phase at the same position in the circumferential direction C on one side in the circumferential direction C. It arrange | positions on the outer side of radial direction R with respect to the transition part 61 of the inner side coil set of the other phase in the same position of the circumferential direction C in the other side of the circumferential direction C.

  Since the transition part 61 of each phase is arranged as described above, as schematically shown in FIGS. 3 and 4, the shape of the transition part 61 in the axial direction L is directed toward the circumferential first direction C <b> 1. Accordingly, the shape is directed inward in the radial direction R. That is, the shape of the crossover portion 61 in the axial direction L is a shape along a spiral that extends from the axial center A side to the outside in the radial direction R. A spiral coil end portion 62 is formed when viewed in the direction L.

  Next, the configuration of the U-phase coil 2U will be specifically described with reference to FIG. In FIGS. 3 and 4, in order to avoid complications, a symbol representing the concentric winding portion 40 is not attached, but as described above, the first coil portion 51, the second coil portion 52, and the third coil Each of the part 53, the fourth coil part 54, the fifth coil part 55, the sixth coil part 56, the seventh coil part 57, and the eighth coil part 58 is constituted by the concentric winding part 40. As shown in FIG. 3, the first coil part 51, the second coil part 52, the third coil part 53, and the fourth coil part 54 are formed by the four concentric winding parts 40 arranged adjacent to each other in the circumferential direction C. The fifth coil portion 55 and the sixth coil portion are configured by four concentric winding portions 40 that are arranged adjacent to each other in the circumferential direction C at positions separated from the four concentric winding portions 40 in the circumferential direction C. 56, a seventh coil portion 57, and an eighth coil portion 58 are configured. This is because all the series coil parts 20 included in the U-phase coil 2U (in this example, the first series coil part 21, the second series coil part 22, the third series coil part 23, and the fourth series coil part 24). This is a common configuration between the two.

  Specifically, for each series coil unit 20, the arrangement region in the circumferential direction C of the first coil unit 51, the second coil unit 52, the third coil unit 53, and the fourth coil unit 54, and the fifth coil unit 55. The arrangement regions in the circumferential direction C of the sixth coil portion 56, the seventh coil portion 57, and the eighth coil portion 58 are opposed to each other in the radial direction R (different from each other by 180 degrees with respect to the position in the circumferential direction C). Is set. Thereby, the magnitude | size and direction of a change of the back electromotive force voltage from the reference back electromotive voltage in a state where the rotor is arranged concentrically with respect to the stator 10 are a plurality of series coil units 20 constituting a parallel circuit in phase. It can suppress that it becomes non-uniform | heterogenous compared with the case where all the concentric winding parts 40 which comprise the serial coil part 20 concentrate on the one part area | region of the circumferential direction C, and are arrange | positioned. The counter electromotive voltage in the series coil unit 20 is generated with the rotation of the rotor. As a result, even when the rotor is arranged in an eccentric state with respect to the stator 10 due to an assembly error or the like, generation of circulating current in the parallel circuit formed by the plurality of in-phase series coil portions 20 is prevented. Even if it is a case where a circulating current generate | occur | produces in the said parallel circuit, the magnitude | size can be reduced.

  In this embodiment, the several concentric winding part 40 with which one series coil part 20 is provided is arrange | positioned at the core 11 in the same order of the circumferential direction C as the electrical connection order. In this embodiment, each of the plurality of concentric winding portions 40 is arranged on the circumferential first direction C1 side with respect to the other concentric winding portion 40 adjacent to the connection terminal 90 side in the electrical connection relationship. The portion 20 is a Y-th series coil portion (Y represents an odd number), and each of the plurality of concentric winding portions 40 is circumferential with respect to another concentric winding portion 40 adjacent to the connection terminal 90 side in the electrical connection relationship. The series coil portion 20 disposed on the second direction C2 side is a Z-th series coil portion (Z represents an even number).

  In the present embodiment, as shown in FIG. 3, the first coil portion 51 of the second series coil portion 22 is in contrast to the concentric winding portion 40 that constitutes the first coil portion 51 of the first series coil portion 21. It is comprised by the concentric winding part 40 arrange | positioned adjacent to the circumferential second direction C2 side. That is, each first coil portion 51 of the first series coil portion 21 and the second series coil portion 22 is configured by two concentric winding portions 40 arranged adjacent to each other in the circumferential direction C. In this embodiment, regarding the arrangement configuration of the concentric winding portion 40, the first series coil portion 21 and the third series coil portion 23 are similarly configured except for the arrangement position in the radial direction R, and the second series The coil part 22 and the fourth series coil part 24 are configured similarly except for the arrangement position in the radial direction R. Therefore, in the present embodiment, the first coil portion 51 of the fourth series coil portion 24 is in the second circumferential direction C2 side with respect to the concentric winding portion 40 constituting the first coil portion 51 of the third series coil portion 23. It is comprised by the concentric winding part 40 arrange | positioned adjacent to.

  In this embodiment, the area | region for 1 round of the circumferential direction C is formed of the 1st area | region, 2nd area | region, 3rd area | region, and 4th area | region set in order toward the circumferential first direction C1 side. Here, the first region includes the first coil portion 51, the second coil portion 52, the third coil portion 53, and the fourth coil portion 54 of the first series coil portion 21 and the third series coil portion 23, respectively. This is the area to be placed. The second region is a region where the fifth coil portion 55, the sixth coil portion 56, the seventh coil portion 57, and the eighth coil portion 58 of the second series coil portion 22 and the fourth series coil portion 24 are arranged. It is. In the third region, the fifth coil part 55, the sixth coil part 56, the seventh coil part 57, and the eighth coil part 58 of the first series coil part 21 and the third series coil part 23 are arranged. It is an area. The fourth region is a region where the first coil portion 51, the second coil portion 52, the third coil portion 53, and the fourth coil portion 54 of the second series coil portion 22 and the fourth series coil portion 24 are arranged. It is.

  Further, in the present embodiment, in the first region, the concentric winding portion 40 constituting the first series coil portion 21 is arranged on the outer side in the radial direction R than the concentric winding portion 40 constituting the third series coil portion 23. On the other hand, in the third region, the concentric winding part 40 constituting the first series coil part 21 is arranged on the inner side in the radial direction R than the concentric winding part 40 constituting the third series coil part 23. Has been. That is, in the first region, the concentric winding portion 40 constituting the first series coil portion 21 is the concentric winding portion 40 of the outer coil set, and the concentric winding portion 40 constituting the third series coil portion 23 is the inner coil. In contrast to the concentric winding portion 40 of the set, in the third region, the concentric winding portion 40 constituting the first series coil portion 21 is the concentric winding portion 40 of the inner coil set, and the third series coil portion 23. The concentric winding part 40 which comprises is the concentric winding part 40 of an outer side coil set. Further, in the fourth region, the concentric winding portion 40 constituting the second series coil portion 22 is arranged on the outer side in the radial direction R than the concentric winding portion 40 constituting the fourth series coil portion 24. In the second region, the concentric winding part 40 constituting the second series coil part 22 is arranged on the inner side in the radial direction R than the concentric winding part 40 constituting the fourth series coil part 24. That is, in the fourth region, the concentric winding portion 40 constituting the second series coil portion 22 is the concentric winding portion 40 of the outer coil set, and the concentric winding portion 40 constituting the fourth series coil portion 24 is the inner coil set. In the second region, the concentric winding portion 40 constituting the second series coil portion 22 is the concentric winding portion 40 of the inner coil set, and constitutes the fourth series coil portion 24. The concentric winding portion 40 is the concentric winding portion 40 of the outer coil set. By adopting such an arrangement, the electromagnetic balance between the first series coil part 21 and the third series coil part 23 is ensured, and the second series coil part 22 and the fourth series coil are secured. The electromagnetic balance with the coil part 24 can be ensured.

  In FIG. 3, in order to avoid complexity, the first coil portion 51, the second coil portion 52, the third coil portion 53, the fourth coil portion 54, and the fifth coil are used for the V-phase coil 2V and the W-phase coil 2W. Part 55, sixth coil part 56, seventh coil part 57, and eighth coil part 58, the first series coil part 21, the second series coil part 22, the third series coil part 23, and the The V series coil 2V and the W phase coil 2W are configured in the same manner as the U phase coil 2U except that the four series coil portions 24 are not denoted by the reference numerals, except that the arrangement positions in the circumferential direction C are different. Yes. Specifically, each concentric winding portion 40 included in the V-phase coil 2V has the same amount (in the present embodiment, the slot pitch of the slot pitch in the circumferential first direction C1 side with respect to the corresponding concentric winding portion 40 of the U-phase coil 2U. (Position 26 times). In addition, each concentric winding portion 40 included in the W-phase coil 2W has the same amount on the side in the first circumferential direction C1 with respect to the corresponding concentric winding portion 40 of the U-phase coil 2U (in this embodiment, 52 times the slot pitch). It is arranged in a positional relationship that is shifted by only. That is, with respect to the arrangement position of the corresponding concentric winding portion 40 in the circumferential direction C, the deviation amount of the W-phase coil 2W toward the circumferential first direction C1 with respect to the U-phase coil 2U is It is set to be twice the amount of deviation in the circumferential first direction C1 side. In addition, the corresponding concentric winding part 40 means the coil part of the same kind in the series coil part 20 of the same kind, for example, the 1st coil part 51 of the 1st series coil part 21 with which the V-phase coil 2V is provided. The concentric winding part 40 of the U-phase coil 2U corresponding to is the first coil part 51 of the first series coil part 21 provided in the U-phase coil 2U.

  Here, the slot 12 in which the coil side part 60 closest to the connection terminal 90 among the plurality of slots 12 in which the series coil part 20 is arranged is defined as a target slot 12a. The target slot 12 a is set from among the plurality of slots 12 in which the coil side portions 60 that can be connected to the connection terminal 90 are arranged. If the concentric winding part 40 wound by the object slot 12a is made into the object concentric winding part 40a, in this embodiment, the concentric winding part 40 which comprises the 1st coil part 51 is the object concentric winding part 40a. As shown in FIG. 3, the target concentric winding portion 40 a does not include the same-phase concentric winding portion 40 that is not the target concentric winding portion 40 a between the circumferential direction C with another target concentric winding portion 40 a in phase. Has been placed. And the arrangement | positioning area | region of each circumferential direction C of the object concentric winding part 40a is set so that it may not have a part which overlaps with the arrangement | positioning area | region of the circumferential direction C of the object concentric winding part 40a of another phase.

  In the present embodiment, as shown in FIG. 2, each of the series coil units 20 is configured by connecting a plurality of coil units 4 in series. As shown in FIG. 5, the coil unit 4 has a plurality of concentric winding portions 40 formed by winding a continuous linear conductor 3 at a plurality of locations. Here, continuous with respect to the linear conductor 3 means that the conductor wires constituting the linear conductor 3 are integrally formed in the extending direction of the conductor wire without a joint. In the present embodiment, each of the series coil portions 20 is configured by connecting two coil units 4 each having four concentric winding portions 40 in series. FIG. 5 shows the coil unit 4 wound around the winding frame 6 during the manufacturing process of the stator 10. In FIG. 5 and FIG. 6 referred later, the reference | standard which represents the concentric winding part 40 is attached | subjected with respect to the cyclic | annular conductor part which comprises the concentric winding part 40 in the state wound by the core 11 for easy understanding. ing. In this example, the coil unit 4 is configured by alternately connecting concentric winding portions 40 whose winding directions are opposite to each other in series.

  And in this embodiment, each of the two coil side parts 60 arrange | positioned at the edge part 4a side of the said coil unit 4 among the several coil side parts 60 with which the coil unit 4 is provided is connected to the connection terminal 90. A possible coil side 60. As described above, the coil side portion 60 that can be connected to the connection terminal 90 is limited to the specific coil side portion 60. The coil side portion 60 is not cut without cutting the connecting wire connecting the concentric winding portions 40 to each other. This is because the manufacturing process can be simplified. In the present embodiment, as shown in FIG. 3, two target slots 12 a are set for each phase from among the plurality of slots 12 in which the coil side portions 60 that can be connected to the connection terminals 90 are arranged. Note that the coil side portion 60 that can be connected to the connection terminal 90 and is not connected to the connection terminal 90 is connected to the coil side portion 60 of the other coil unit 4 or to the neutral point 91. Connected.

  As shown in FIG. 3, the arrangement pattern of the multi-phase target slots 12a is such that the phase arrangement order of the multi-phase target slots 12a in the circumferential direction C is the phase arrangement order of the multi-phase slots 12 in the circumferential direction C. Among the plurality of equal arrangement patterns, the pattern is set such that the dispersion of the intervals in the circumferential direction C of the target concentric winding portions 40a adjacent to each other in the circumferential direction C is the smallest. The variance is an arithmetic average (arithmetic mean) of values obtained by squaring the difference between each value and the average value. In the present embodiment, the arrangement order of the phases in the circumferential direction C of the plurality of slots 12 is the order of the U phase, the V phase, and the W phase toward the circumferential first direction C1 side, starting from the U phase. . Correspondingly, in this embodiment, as shown in FIG. 3, the order of the phases in the circumferential direction C of the target slots 12a of the plurality of phases is also directed from the U phase to the circumferential first direction C1 side. , U phase, V phase, W phase.

  Moreover, in this embodiment, the space | interval of the circumferential direction C of the object concentric winding part 40a of the mutually different phase adjacent to the circumferential direction C is made into the center positions of the arrangement | positioning area | regions of the circumferential direction C of the object concentric winding part 40a of each phase. Interval. In this embodiment, since one phase coil 2 is provided with a plurality of target concentric winding portions 40a that are arranged at adjacent positions in the circumferential direction C, the arrangement region of the target concentric winding portion 40a in the circumferential direction C is provided. Is the center position of the region in the circumferential direction C where the plurality of target concentric winding portions 40a are arranged. Therefore, in the present embodiment, the intervals in the circumferential direction C of the target concentric winding portions 40a adjacent to each other in the circumferential direction C are, as shown in FIG. 3, the first interval D1, the second interval D2, and the third interval The average value of the 1st space | interval D1, the 2nd space | interval D2, and the 3rd space | interval D3 is represented by the space | interval D3, and becomes 120 degree | times. Therefore, in this embodiment, the dispersion | distribution of the space | interval of the circumferential direction C of the object concentric winding part 40a of a mutually different phase adjacent to the circumferential direction C is the square of (D1-120), and the square of (D2-120). And the sum of the square of (D3-120) and divided by “3”. In the present embodiment, the first interval D1 which is the interval in the circumferential direction C of each of the target concentric winding portions 40a of the U phase and V phase adjacent to each other in the circumferential direction C, and the V phase and W adjacent to each other in the circumferential direction C. The second interval D2 that is the interval in the circumferential direction C of each target concentric winding portion 40a of the phase is set to an equal angle to each other, specifically, an angle obtained by adding twice the slot pitch to 90 degrees It is set to 97.5 degrees. Further, in the example shown in FIG. 3, the center position of the arrangement region in the circumferential direction C of the target concentric winding part 40a of each phase is the circumferential direction C of the target slot 12a of each phase (two target slots 12a in this example). This coincides with the center position of the arrangement area.

  By the way, in this embodiment, each of the two coil side parts 60 arrange | positioned at the edge part 4a side of the said coil unit 4 most among the some coil side parts 60 with which the coil unit 4 is provided as above-mentioned. The coil side portion 60 is connectable to the connection terminal 90. And in this embodiment, the coil unit 4 of each phase is arrange | positioned at the core 11 by the positional relationship of the circumferential direction C defined beforehand. Therefore, in the present embodiment, the arrangement pattern of the target slots 12a of the plurality of phases in which the arrangement order of the phases in the circumferential direction C of the target slots 12a of the plurality of phases is equal to the arrangement order of the phases in the circumferential direction C of the slots 12 of the plurality of phases. Among them, the pattern in which the dispersion of the interval in the circumferential direction C between the target concentric winding portions 40a adjacent to each other in the circumferential direction C is the smallest is specified in the pattern shown in FIG. Thus, in the present embodiment, the reason why the coil units 4 of the respective phases are arranged on the core 11 in a predetermined circumferential direction C will be described below.

  In the present embodiment, as shown in FIG. 4, a coil holder is provided as a preparation before the coil unit group 5, which is a group of the multi-phase coil units 4 arranged in the same region in the circumferential direction C, is arranged in the core 11. It is an arrangement unit when arranged in 70. As shown in FIG. 6, the coil holder 70 includes a plurality of blades 71 that are rod-shaped members. In the following, assuming that the coil cage 70 is arranged coaxially with the core 11, the coil cage 70 will also be described using each of the axial direction L, the circumferential direction C, and the radial direction R. . In FIG. 6, only some blades 71 are shown, but in this example, the same number of blades 71 as the teeth 13 of the core 11 are distributed in the circumferential direction C at the same pitch as the slot pitch. An insertion gap 72 having an open end on the first axial direction L1 side is formed between the adjacent blades 71.

  As shown in FIG. 6, each concentric winding portion 40 has the insertion portion of the concentric winding portion 40 inserted in each of two insertion gaps 72 separated by 5 times the arrangement pitch of the insertion gap 72 in the circumferential direction C. Thus, it arrange | positions with respect to the coil holder | retainer 70 from the axial 1st direction L1 side. At this time, the concentric winding part 40 of the U-phase coil 2U, the concentric winding part 40 of the V-phase coil 2V, and the W-phase coil so as to correspond to the shape of the spiral coil end part 62 (see FIGS. 1 and 3). The 2 W concentric winding portions 40 are sequentially arranged along the circumferential direction C at an interval twice the arrangement pitch of the insertion gaps 72. That is, the concentric winding portions 40 of the respective phases are arranged with respect to the coil holder 70 so as to overlap each other in an inclined state. In FIG. 6, only a part of the concentric winding portion 40 is shown, but the concentric winding portion 40 of the U-phase coil 2U, the concentric winding portion 40 of the V-phase coil 2V, and the concentric winding portion 40 of the W-phase coil 2W are Over the entire area in the circumferential direction C, the elements are repeatedly arranged one by one at an interval twice the arrangement pitch of the insertion gaps 72.

  The core 11 is arranged so that the teeth 13 face the blade 71 in the radial direction R in a state where all the concentric winding portions 40 constituting one coil set for each phase are held by the coil holder 70. . And each concentric winding part 40 of the state currently hold | maintained at the coil holder | retainer 70 using the coil pusher (not shown) is pushed up to the axial first direction L1 side, and is pushed out to the outer side of radial direction R. A part of the winding part 40 is inserted into the slot 12, and each phase coil 2 is wound around the core 11. At this time, the phase coils 2 for three phases are collectively wound around the core 11. In the present embodiment, the phase coil 2 of each phase includes two coil sets (an outer coil set and an inner coil set). Therefore, the above-described steps are repeated twice to configure an outer coil set for each phase. After all the concentric winding portions 40 are wound around the core 11, all the concentric winding portions 40 constituting the inner coil set for each phase are wound around the core 11. Thus, in this embodiment, the coil 1 is wound around the core 11 by the insert method.

  As described above, in this embodiment, the concentric winding part 40 of the U-phase coil 2U, the concentric winding part 40 of the V-phase coil 2V, and the concentric winding part 40 of the W-phase coil 2W overlap each other in an inclined state. It arrange | positions with respect to the coil holder | retainer 70. Correspondingly, in this embodiment, preparation before arranging the coil unit group 5 (see FIG. 4), which is a group of the multi-phase coil units 4 arranged in the same region in the circumferential direction C, in the core 11. As an arrangement unit when arranged in the coil holder 70. This minimizes the need for operations that can complicate the arrangement process of each phase coil 2 with respect to the coil holder 70, such as extracting the insertion part already inserted into the insertion gap 72 from the insertion gap 72. Can be suppressed.

  For the above reasons, in the present embodiment, the coil holder group 70, which is a group of the multi-phase coil units 4 arranged in the same region in the circumferential direction C, is provided in the coil holder 70 as a preparation before being arranged in the core 11. The placement unit is used when placed. In the present embodiment, N, which is the number of concentric windings 40 distributed in the circumferential direction C for each phase coil 2, is “16”, whereas the concentric windings provided in one coil unit 4 The number of 40 is “4”. That is, in the present embodiment, the number of concentric winding portions 40 included in one coil unit 4 is set to a value obtained by dividing N by “4”. Therefore, in this embodiment, by arranging the four coil unit groups 5 side by side in the circumferential direction C, all the concentric winding portions 40 constituting one coil set for each phase are arranged in the coil holder 70. . Thus, in this embodiment, one coil set of each phase is comprised by the four coil units 4 arrange | positioned along with the circumferential direction C. FIG. For this reason, the coil side portions 60 that can be connected to the connection terminal 90 are arranged in eight locations in the circumferential direction C. In the present embodiment, the connection terminal 90 is connected to each of the two coil side portions 60 adjacent to each other in the circumferential direction C among the eight coil side portions 60 connectable to the connection terminal 90.

  As described above, in the arrangement pattern of the target slots 12a of the plurality of phases, the arrangement order of the phases in the circumferential direction C of the target slots 12a of the plurality of phases becomes equal to the arrangement order of the phases in the circumferential direction C of the slots 12 of the plurality of phases. Among the plurality of arrangement patterns, by setting the pattern in which the dispersion of the intervals in the circumferential direction C of the target concentric winding portions 40a adjacent to each other in the circumferential direction C is the smallest, that is, the pattern shown in FIG. The maximum potential difference between the phase coils 2 in a portion where two different phase coils 2 are arranged in contact with or close to each other in the coil end portion 62 can be suppressed. The reason for this will be described with reference to FIG. 4 according to the present embodiment and FIG. 7 which is a comparative example. FIG. 7 is a diagram showing a comparative example when the present invention is not applied. In this comparative example, unlike the present invention, the arrangement pattern of the target slots 12a of the plurality of phases is the target slot 12a of the plurality of phases. The phase arrangement order in the circumferential direction C of the plurality of slots 12 is set to a pattern that is not equal to the phase arrangement order in the circumferential direction C of the plurality of slots 12 (that is, the reverse order). That is, in the configuration shown in FIG. 7, the arrangement order of the phases in the circumferential direction C of the target slots 12a of the plurality of phases starts from the U phase and proceeds toward the circumferential first direction C1 to the U phase, the W phase, and the V phase. Are set in this order. In the configuration shown in FIG. 7, the U-phase coil 2U and the W-phase coil 2W are configured in the same manner as in the present embodiment, and only the configuration of the V-phase coil 2V (arrangement position in the circumferential direction C) is different from the present embodiment. ing. The configuration shown in FIG. 7 is not an embodiment of the present invention, but the same reference numerals as those in FIGS. 3 and 4 are attached for easy understanding.

  FIG. 4 is a diagram showing only one coil unit group 5 of the outer coil set in FIG. As shown in FIG. 4, in this embodiment, the first coil part 51 of the first series coil part 21 provided in the U-phase coil 2U is the fourth coil part of the second series coil part 22 provided in the V-phase coil 2V. 54, the arrangement area in the circumferential direction C is arranged so as to overlap. Moreover, the 1st coil part 51 of the 2nd series coil part 22 with which the V phase coil 2V is provided is arrangement | positioning of the circumferential direction C with respect to the 4th coil part 54 of the 1st series coil part 21 with which the U phase coil 2U is provided. Arranged so that areas overlap. On the other hand, in the comparative example shown in FIG. 7, the first coil portion 51 of the second series coil portion 22 provided in the U-phase coil 2U is the fourth coil portion of the first series coil portion 21 provided in the V-phase coil 2V. In addition to 54, the third coil portion 53 is arranged so that the arrangement region in the circumferential direction C overlaps. Further, the first coil part 51 of the first series coil part 21 provided in the V-phase coil 2V is added to the third coil part 53 in addition to the fourth coil part 54 of the second series coil part 22 provided in the U-phase coil 2U. On the other hand, it arrange | positions so that the arrangement | positioning area | region of the circumferential direction C may overlap.

  As described above, in the present embodiment, the first coil part 51 of the U-phase coil 2U and the first coil part 51 of the V-phase coil 2V are connected to the fourth coil part 54 of the other phase or the neutral point 91 side of the fourth coil part 54. It arrange | positions so that the arrangement | positioning area | region of the circumferential direction C may overlap only with respect to the concentric winding part 40. FIG. Although the description is omitted, the same applies to the first coil portion 51 of the W-phase coil 2W. On the other hand, in the comparative example shown in FIG. 7, the first coil portion 51 of the U-phase coil 2 </ b> U and the first coil portion 51 of the V-phase coil 2 </ b> V are also circumferentially connected to the third coil portion 53 of the other phase. Are arranged so that their arrangement areas overlap. Although the description is omitted, the same applies to the first coil portion 51 of the W-phase coil 2W. Although not shown in the drawings, as another comparative example, the arrangement pattern of the target slots 12a of the plurality of phases is the same as the arrangement direction of the phases in the circumferential direction C of the target slots 12a of the plurality of phases. In the arrangement pattern that is equal to the arrangement order of the phases in C, a configuration in which the dispersion of the intervals in the circumferential direction C between the target concentric winding portions 40a of mutually different phases adjacent in the circumferential direction C is also considered. It is done. In this case, the fifth coil part 55, the sixth coil part 56, the seventh coil part 57, and the eighth coil part 58 of the W-phase coil 2W shown in FIG. 7 are the first coil part 51 of the W-phase coil 2W, The second coil part 52, the third coil part 53, and the fourth coil part 54 are replaced. In this other comparative example, the first coil portion 51 of the V-phase coil 2V is in the circumferential direction C only with respect to the fourth coil portion 54 of the other phase and the concentric winding portion 40 on the neutral point 91 side thereof. Although it arrange | positions so that an arrangement | positioning area | region may overlap, the 1st coil part 51 of the U-phase coil 2U and the 1st coil part 51 of the W-phase coil 2W are circumferential direction C also with respect to the 3rd coil part 53 of another phase. Are arranged so that their arrangement areas overlap.

  Here, since the first coil portion 51 is the concentric winding portion 40 (target concentric winding portion 40 a) closest to the connection terminal 90 in the series coil portion 20, the phase coils 2 having different phases are arranged in the coil end portion 62. In order to suppress the maximum potential difference between the phase coils 2 in a portion arranged in contact or close to each other, the concentric winding portion 40 in which the arrangement region in the circumferential direction C overlaps the first coil portion 51 is neutralized. The concentric winding 40 needs to be as close as possible to the point 91. In this regard, in this embodiment, the first coil portion 51 of each phase coil 2 is arranged in the circumferential direction C with respect to the third coil portion 53 of the other phase and the concentric winding portion 40 on the connection terminal 90 side thereof. Can be arranged so as not to overlap with each other, so that the maximum potential difference can be suppressed smaller than in the comparative example shown in FIG. As a result, for example, the insulation performance required for the interphase insulating member is lowered, or only the insulating film formed on the surface of the conductor wire constituting the linear conductor 3 without the interphase insulating member is used. Electrical insulation between the phase coils 2 can be ensured, and the manufacturing cost of the stator 10 can be reduced and the coil end portion 62 can be downsized. The interphase insulating member is a member (for example, a sheet-like member) formed of a member having electrical insulation, and is used to ensure electrical insulation between the phase coils 2 of different phases. It is done.

3. Other Embodiments Finally, other embodiments of the coil for rotating electrical machines according to the present invention will be described. Note that the configurations disclosed in the following embodiments can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises.

(1) In the above embodiment, the case where the number of magnetic poles per phase is “16” and a total of 96 slots 12 are arranged in the core 11 has been described as an example. However, the embodiment of the present invention is not limited to this. For example, as in the example shown in FIG. 8, the number of magnetic poles per phase is “8”, and a total of 48 slots 12 are formed in the core 11, as in the example shown in FIG. 9. The number of magnetic poles per phase is “12”, and a total of 72 slots 12 are formed in the core 11. In the example shown in FIGS. 8 and 9, as in the above embodiment, the number of concentric winding portions 40 included in one coil unit 4 is the value obtained by dividing N representing the number of magnetic poles per phase by “4”. Is set to That is, as shown in FIG. 8 and FIG. 9, one coil unit group 5 is surrounded by a broken line, and in the example shown in FIG. 8, the number of concentric winding portions 40 included in one coil unit 4 is “2”. In the example shown in FIG. 9, the number of concentric winding portions 40 included in one coil unit 4 is “3”. Although not described in detail, even in the examples shown in FIGS. 8 and 9, the arrangement pattern of the target slots 12a of the plurality of phases is a slot in which the order of phases in the circumferential direction C of the target slots 12a of the plurality of phases is a plurality of phases. Among the plurality of arrangement patterns that are equal to the arrangement order of the phases in the 12 circumferential directions C, the pattern in which the dispersion of the intervals in the circumferential direction C of the target concentric winding portions 40a of the phases different from each other adjacent to the circumferential direction C is the smallest Is set. In the example shown in FIGS. 8 and 9, as in the above embodiment, the first interval D1 and the second interval D2 are angles obtained by adding twice the slot pitch to 90 degrees (in the example shown in FIG. 8). 105 degrees and 100 degrees in the example shown in FIG.

(2) In the above embodiment, the case where each of the phase coils 2 includes a plurality of coil sets arranged in different regions in the radial direction R has been described as an example. However, the embodiment of the present invention is not limited to this, and each phase coil 2 may be configured to include a single coil set, as in the examples shown in FIGS. 8 and 9.

(3) In the above embodiment, the case where each of the phase coils 2 includes a plurality of series coil units 20 has been described as an example. However, the embodiment of the present invention is not limited to this, and each of the phase coils 2 may include a single series coil unit 20. In this case, the target concentric winding part 40a has no other target concentric winding part 40a in phase. In this case, one target slot 12a is set for each phase.

(4) In the above embodiment, the coil unit group 5, which is a group of the multi-phase coil units 4 arranged in the same region in the circumferential direction C, is arranged in the coil holder 70 as preparation before being arranged in the core 11. The case where it is an arrangement unit at the time of being described has been described as an example. However, the embodiment of the present invention is not limited to this, and depending on the manufacturing method of the stator 10, the arrangement unit when the multi-phase coil units 4 arranged in the same region in the circumferential direction C are arranged in the core 11. In other words, it is also possible to adopt a configuration that is an insertion unit when inserted into the slot 12.

(5) Regarding other configurations, it should be understood that the embodiments disclosed herein are illustrative in all respects and that the scope of the present invention is not limited thereby. Those skilled in the art will readily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Accordingly, other embodiments modified without departing from the spirit of the present invention are naturally included in the scope of the present invention.

  In the present invention, N slots (N represents a positive multiple of 4) are wound around a core formed with the same number of slots for each phase along the circumferential direction and distributed in the circumferential direction. A plurality of phase coils provided with concentric windings can be used for a rotating electrical machine coil configured by star connection.

1: Coil (coil for rotating electrical machines)
2: Phase coil 3: Linear conductor 4: Coil unit 4a: End part 11: Core 12: Slot 12a: Target slot 20: Series coil part 40: Concentric winding part 40a: Target concentric winding part 60: Coil side part 61: Crossing portion 70: Coil holder 90: Connection terminal 91: Neutral point C: Circumferential direction L: Axial direction R: Radial direction S: Core reference plane

Claims (2)

N slots (N is a positive multiple of 4) are wound around a core in which the same number of slots for each phase are repeatedly formed along the circumferential direction of the cylindrical core reference surface and distributed in the circumferential direction. A coil for a rotating electrical machine in which a plurality of phase coils having concentric windings are star-connected,
The concentric winding part includes a coil side part disposed in the slot, and a crossing part that connects the pair of coil side parts outside the core in the axial direction of the core reference plane,
The crossover portion is disposed on the radially inner side of the core reference surface with respect to the crossover portion of the other phase at the same position in the circumferential direction on one side in the circumferential direction, and on the other side in the circumferential direction In the radial direction with respect to the transition portion of the other phase at the same position in the circumferential direction,
Each of the phase coils includes a plurality of the concentric winding parts connected in series with each other, and one or more series coil parts having one end connected to a neutral point and the other end connected to a connection terminal,
Among the plurality of slots in which the series coil part is arranged, the target slot which is the slot in which the coil side part closest to the connection terminal is arranged is the coil side part that can be connected to the connection terminal. Is set from a plurality of the slots,
The target concentric winding part, which is the concentric winding part wound around the target slot, has the same phase concentric winding that is not the target concentric winding part between the circumferential direction of the target concentric winding part and another target concentric winding part. Parts are not included,
The arrangement pattern of the target slots of a plurality of phases is a plurality of arrangement patterns in which the arrangement order of the phases in the circumferential direction of the target slots of the plurality of phases is equal to the arrangement order of phases in the circumferential direction of the slots of the plurality of phases. Thus, the coil for a rotating electrical machine is set to a pattern in which the dispersion of the circumferential spacing of the target concentric windings of mutually different phases adjacent to each other in the circumferential direction is minimized. Each of the series coil portions is configured by connecting a plurality of coil units having a plurality of concentric winding portions formed by winding a continuous linear conductor at a plurality of locations,
Arrangement unit when the coil units of a plurality of phases arranged in the same region in the circumferential direction are arranged in the core, or arrangement when arranged in the coil holder as preparation before arranging in the core Unit,
Each of the two coil side portions arranged closest to the end side of the coil unit among the plurality of coil side portions included in the coil unit is the coil side portion connectable to the connection terminal. Item 2. A coil for a rotating electrical machine according to Item 1.

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