JP2015186292A - Coil for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a coil for rotary electric machine, which achieves both a reduction in the manufacturing cost of a rotary electric machine and a reduction in the size of a coil end part.SOLUTION: Each of phase coils 2 has series coil parts 21 to 24 composed by connecting a plurality of concentric wound parts in series. Of the plurality of concentric wound parts composing the series coil parts 21 to 24, at least one concentric part continuing from an end side opposite to a neutral point 91 is used as an end-side concentric wound part 44, and each arranged area of the end-side concentric wound part 44 in a circumferential direction C is set so as not to have a portion overlapping the arranged area of the end-side concentric wound part 44 of the other phase in the circumferential direction C.

Description

  The present invention is a structure in which a core having a plurality of slots distributed in the circumferential direction of a cylindrical core reference surface is wound and a phase coil corresponding to each of a plurality of phases is star-connected. The present invention relates to an electric coil.

  As a coil for a rotating electrical machine as described above, one described in Japanese Patent No. 4665595 (Patent Document 1) is known. In Patent Document 1, a configuration including two series coil parts (series coil A and series coil B shown in FIG. 5 of the document) in which phase coils are connected in parallel to each other is formed by the two series coil parts. A technique for suppressing the generation of circulating current in a parallel circuit is described. Japanese Patent No. 4617992 (Patent Document 2) also describes a similar technique.

Japanese Patent No. 4665595 Japanese Patent No. 4617992

  By the way, when the rotating electrical machine coil is used in, for example, a rotating electrical machine as a wheel driving force source in a vehicle drive device, a potential difference between phase coils of different phases becomes relatively large. It is common to provide an interphase insulating member at the coil end. When such an interphase insulating member is provided, the manufacturing cost of the rotating electrical machine increases according to the part cost, the assembly cost, and the like, and the coil end portion is likely to be enlarged according to the arrangement space of the interphase insulating member. However, in Patent Document 1 and Patent Document 2, no particular recognition has been made on this point.

  Thus, it is desired to realize a coil for a rotating electrical machine that can reduce both the manufacturing cost of the rotating electrical machine and the size of the coil end portion.

  It is wound around a core having a plurality of slots distributed in the circumferential direction of a cylindrical core reference surface according to the present invention, and phase coils corresponding to each of a plurality of phases are configured by star connection. A characteristic configuration of the coil for a rotating electrical machine is that each of the phase coils includes a series coil portion configured by connecting a plurality of concentric winding portions in series with each other, and the plurality of concentric winding portions constituting the series coil portion. Of these, at least one concentric winding part continuous from the end side opposite to the neutral point is defined as an end side concentric winding part, and each of the end side concentric winding parts is disposed in the circumferential direction. However, it exists in the point set so that it may not have a part which overlaps with the said arrangement | positioning area | region of the said circumferential direction of the said edge part side concentric winding part of another phase.

  As described above, when the rotating electrical machine coil is configured by star connection of the phase coils corresponding to each of the plurality of phases, each of the end side concentric winding portions has two different phase coils. Are arranged on the end side of a series circuit connected in series with each other through a neutral point. Therefore, the potential difference between the phase coils of two different phases is likely to increase between the respective end side concentric windings of the two phases. According to said characteristic structure, the arrangement | positioning area | region of each circumferential direction of the edge part side concentric winding part of the edge side concentric winding part of the other phase where the electric potential difference between the said edge part side concentric winding parts tends to become large easily It is set so as not to have a portion overlapping with the circumferential arrangement region. Therefore, compared with the case where each circumferential arrangement region of the end side concentric winding part has a portion overlapping with the circumferential arrangement region of the end side concentric winding part of the other phase, the phase coils of the phases different from each other However, the maximum potential difference between the phase coils in the portion arranged in contact with or close to the coil end portion can be suppressed. As a result, for example, the insulation performance required for the interphase insulating member is reduced, or the electrical insulation between the phase coils of each phase is achieved only by the insulating film formed on the surface of the coil without providing the interphase insulating member. Therefore, it is possible to reduce both the manufacturing cost of the rotating electrical machine and the size of the coil end portion.

  Here, the phase coil includes a plurality of the series coil parts connected in parallel to each other, and the connecting conductors connecting the two concentric winding parts connected in series to each other in the series coil part are in the other phases. A winding part wound concentrically with respect to the target concentric winding part that is the concentric winding part constituting the series coil part is provided, and the number of turns of the target concentric winding part is not the target concentric winding part It is preferable that the number of turns of the winding portion is set to be smaller than that of the concentric winding portion, and the target concentric winding portion is set to the concentric winding portion other than the end side concentric winding portion.

According to this configuration, the target concentric winding portion is set to a concentric winding portion other than the end-side concentric winding portion, so that the winding portion can be provided on the connecting wire while suppressing an increase in the maximum potential difference. . Supplementally, when the target concentric winding part is set to the concentric winding part that constitutes the end side concentric winding part, the concentric winding part connected to the neutral point side with respect to the end side concentric winding part is used. The potential difference between a certain adjacent concentric winding portion and the neutral point is increased by the amount that the number of turns of the target concentric winding portion is set to be reduced by the number of turns of the winding portion. And in this invention, it sets so that each circumferential arrangement | positioning area | region of the edge part side concentric winding part may not have a part which overlaps with the circumferential arrangement | positioning area | region of the edge part side concentric winding part of another phase. Therefore, the potential difference between the adjacent concentric winding part and a part of the phase coil of the other phase (for example, the end side concentric winding part) can be an element that determines the maximum potential difference. In this regard, according to the above configuration, since the target concentric winding portion is set to a concentric winding portion other than the end side concentric winding portion, the adjacent concentric winding portion and the neutral point can increase the maximum potential difference. The winding portion can be provided on the connecting wire while suppressing an increase in potential difference between the first and second wires.
Furthermore, according to the above configuration, the number of windings of the target concentric winding part is set to be smaller by the number of windings of the winding part than that of the concentric winding part that is not the target concentric winding part. It is possible to make the number of times constant, and to reduce the volume of the coil disposed on the outer side in the axial direction with respect to the core by the amount that a part of the connecting wire is wound in the slot.
Therefore, according to said structure, the winding part which makes it possible to reduce the volume of the coil arrange | positioned on the outer side of an axial direction with respect to a core is made into a connection conducting wire, suppressing the increase in said maximum potential difference. Can be provided. Therefore, it is possible to further reduce the size of the coil end portion.

  As described above, in the configuration in which the connection conductor includes the winding portion, the series coil portion includes a first concentric winding portion and a second concentric winding portion that are the concentric winding portions whose winding directions are opposite to each other. The first concentric winding portion and the second concentric winding portion are connected in series so as to alternate one by one, and the winding direction of the winding portion extends from both ends of the winding portion. The target concentric winding portion from either the first concentric winding portion or the second concentric winding portion so that the circumferentially arranged regions of the two extending portions of the connecting conductors are in a winding direction that does not overlap each other. Is preferably set.

  According to this configuration, it is easy to provide the winding portion on the connecting wire so that the volume of the coil disposed on the outer side in the axial direction with respect to the core is reduced, and the coil end portion can be further reduced in size. Can do. Further, according to the above configuration, the first concentric winding portion and the second concentric winding portion whose winding directions are opposite to each other are alternately connected in series one by one, so that the series coil portion is configured. It is also possible to relax the restrictions on the winding device, such as using a winding device.

  In addition, in the configuration in which the connection conductor includes the winding part as described above, the target concentric winding part is a plurality arranged between the circumferential directions of the two concentric winding parts connected by the connection conductor. The concentric winding part is set based on a predetermined selection condition, and the connection conductor extends from one end of the winding part to the one concentric winding part to be connected; A second extending portion extending from the other end of the winding portion to the other concentric winding portion to be connected, and when there are a plurality of the concentric winding portions satisfying the selection condition, The concentric winding in which the difference in the extending length in the circumferential direction between the first extending portion and the second extending portion between the circumferential directions of the two concentric winding portions to be connected is the smallest. It is preferable that the part is set as the target concentric winding part.

  According to this configuration, the winding portion can be provided on the connecting wire while appropriately ensuring the manufacturing quality of the rotating electrical machine. In supplementary explanation, when the winding part is held using a jig for holding the target concentric winding part at the time of manufacturing the rotating electrical machine, the first extension part and the second extending part are secured in order to ensure the manufacturing quality of the rotating electrical machine. It is required to avoid contact with the phase coil of the other phase of the extending portion and to suppress the degree of the contact to be low. In this regard, according to the above-described configuration, it is possible to appropriately increase the manufacturing quality of the rotating electrical machine by avoiding that the extension length of one of the first extension portion and the second extension portion is excessively long. Can be secured.

  In the coil for a rotating electrical machine having each configuration described above, N pieces of concentric winding portions (N represents an integer of 1 or more) continuous from the end portion side opposite to the neutral point are connected to the end portion side concentric winding. And the number of the slots formed in the core is J, the number of the slots overlapping the circumferential arrangement region of one concentric winding is K, and the series included in one phase coil When the number of coil portions is L and the number of phases is M, the value of the integer part of {J / (K × L × M)} is preferably N.

  According to this structure, the range which can set the circumferential arrangement area | region of each edge part side concentric winding part so that it may not have a part which overlaps with the circumferential arrangement area | region of the edge part concentric winding part of another phase The number of concentric winding portions constituting the end side concentric winding portion can be set large. Therefore, the maximum potential difference can be appropriately reduced.

It is an axial view of a stator according to an embodiment of the present invention. It is a connection diagram of the coil which concerns on embodiment of this invention. It is a simplification figure of the series coil part concerning the embodiment of the present invention. It is an expanded view of the several series coil part with which the phase coil which concerns on embodiment of this invention is equipped. It is an expanded view of the several phase coil with which the coil which concerns on embodiment of this invention is equipped.

  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”, “circumferential direction C”, and “radial direction R” are based on the cylindrical core reference plane S, in other words, the core The axis A of the reference surface S is defined as a reference (see FIG. 1). 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. 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. 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 and the radial direction R. In the present embodiment, each of the slots 12 has openings on both sides in the axial direction 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 a slot 12 for each phase is arranged in the core 11 so as to repeatedly appear in 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 U-phase, V-phase, and W-phase slots 12 are arranged in the core 11 so as to repeatedly appear in the circumferential direction C. 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 (not shown) which is a linear conductor. The linear conductor is made of a conductive material such as copper or aluminum. As such a linear conductor, for example, a linear conductor having a circular cross section perpendicular to the extending direction can be used. On the surface of the linear conductor, an insulating film made of an electrically insulating material such as resin is formed.

  As shown in FIGS. 1 and 2, each of the phase coils 2 includes a first concentric winding portion 41 and a second concentric winding portion 42 that are concentric winding portions whose winding directions are opposite to each other in the circumferential direction C. Along with the magnetic pole pitch P, the magnetic pole pitch P is alternately provided. That is, the several concentric winding part with which the one phase coil 2 is provided is arrange | positioned along with the circumferential direction C so that the arrangement | positioning area | region of the circumferential direction C may not mutually overlap. In the present embodiment, the magnetic pole pitch P is six times the slot pitch (arrangement pitch of the slots 12). In FIG. 1 and FIG. 3 to be referred to later, only the first concentric winding portion 41 is hatched in order to easily distinguish the first concentric winding portion 41 and the second concentric winding portion 42. In addition, the winding direction of two concentric winding parts is reverse, that is, the phase coil along the extending direction of the linear conductor 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 2 to the other end, it means that one concentric winding is wound in the clockwise direction and the other concentric winding is wound in the counterclockwise direction. Therefore, the first concentric winding portion 41 and the second concentric winding portion 42 form magnetic poles that are opposite to each other when the coil 1 is energized. The concentric winding portion is a coil portion (overlapping winding portion) formed by winding a linear conductor or a bundle of linear conductors a plurality of times between a pair or a plurality of pairs of slots 12. In the present embodiment, each of the first concentric winding portion 41 and the second concentric winding portion 42 is formed between a pair of slots 12 (in this example, between a pair of slots 12 separated from each other by 5 times the slot pitch). A bundle of linear conductors or linear conductors is wound a plurality of times.

  As shown in FIG. 2, the coil 1 is configured by star-connecting phase coils 2 (in this example, a U-phase coil 2U, a V-phase coil 2V, and a W-phase coil 2W) corresponding to each of a plurality of phases. ing. 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. 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 FIG. 1, for ease of understanding, it is assumed that each concentric winding is directed from the connection terminal 90 side toward the neutral point 91 side along the extending direction of the linear conductors constituting the phase coil 2. A portion that faces the back side of the paper by a white circle with an “X” -shaped symbol inside, and a portion that faces the front side of the paper by a white circle with a dot-like symbol inside Is shown. In the present embodiment, when going from the connection terminal 90 side toward the neutral point 91 side along the extending direction of the linear conductor constituting the phase coil 2, the coil is wound in the clockwise direction when viewed from the inside of the radial direction R. The concentric winding portion to be wound is referred to as a first concentric winding portion 41, and the concentric winding portion wound in the counterclockwise direction when viewed from the inside in the radial direction R is referred to as a second concentric winding portion 42.

  Each of the phase coils 2 includes the same number of first concentric winding portions 41 as the number of magnetic pole pairs (eight in this example) and the same number of second concentric winding portions 42 as the number of magnetic pole pairs. Regarding the arrangement state of the first concentric winding part 41 and the second concentric winding part 42 in the circumferential direction C, the U-phase coil 2U, the V-phase coil 2V, and the W-phase coil 2W are arranged in a positional relationship shifted from each other in the circumferential direction C. Has been. In this embodiment, as shown in FIG. 1, the V-phase coil 2V is arranged with a positional relationship shifted by four times the slot pitch on the first circumferential direction C1 side with respect to the U-phase coil 2U. Are arranged in a positional relationship shifted by four times the slot pitch on the second circumferential direction C2 side with respect to the U-phase coil 2U. Moreover, each turn part of the phase coil 2 is arrange | positioned so that it may extend in the circumferential direction C in the area | region of the radial direction R set for every phase. Here, the turn part is a part of a concentric winding part protruding in the axial direction from the core 11. In this embodiment, as schematically shown in FIG. 1, a turn portion of the U-phase coil 2U, a turn portion of the V-phase coil 2V, and a turn portion of the W-phase coil 2W are arranged in order from the outside in the radial direction R. The A coil end portion that is a portion of the coil 1 that protrudes in the axial direction from the core 11 is formed by the turn portion and a connecting conductor 30 (see FIGS. 2 and 3) described later.

  Each of the phase coils 2 includes a series coil portion 20 configured by connecting a plurality of concentric winding portions in series with each other. In the present embodiment, the series coil unit 20 includes the first concentric winding part 41 and the second concentric winding part 42, and the first concentric winding part 41 and the second concentric winding part 42 alternately. It is configured in series connection. In this example, each of the series coil portions 20 includes two first concentric winding portions 41 and two second concentric winding portions 42. Moreover, as shown in FIG.2 and FIG.3, the series coil part 20 is a connection which connects two concentric winding parts (the 1st concentric winding part 41 and the 2nd concentric winding part 42 in this example) mutually connected in series. A conducting wire 30 is provided. As will be described later, in this embodiment, some of the connecting conductors 30 include a winding portion 33. For this reason, in the present embodiment, some of the connection conductors 30 are disposed not on the whole connection conductor 30 but on the outer side in the axial direction with respect to the core 11. In FIG. 1, the connecting wire 30 is omitted for simplification.

  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.

  As shown in FIGS. 3 and 4, the plurality of concentric winding parts provided in one series coil part 20 are arranged in the same order in the circumferential direction C as the electrical connection order. FIG. 3 is a simplified diagram of the first series coil portion 21 of the U-phase coil 2U. In FIG. 1, only the first series coil portion 21 of the U-phase coil 2 </ b> U shown in FIG. 3 is provided with a first coil portion 51, a second coil portion 52, and a third coil portion in order to facilitate comparison with FIG. 3. 53 and the code | symbol showing the 4th coil part 54 are attached | subjected, and the connection relationship with each of the connection terminal 90 and the neutral point 91 is shown. FIG. 4 is a diagram in which each of the plurality of series coil portions 20 provided in the U-phase coil 2U is developed in a planar shape in the circumferential direction C so that the inner side in the radial direction R is the front side of the drawing. In FIG. 4 and FIG. 5 to be referred to later, in order to avoid complexity, the reference “41” indicating the first concentric winding and the reference “42” indicating the second concentric winding are not attached. As described above, when going from the connection terminal 90 side toward the neutral point 91 side along the extending direction of the linear conductor constituting the phase coil 2, the coil is wound in the clockwise direction when viewed from the inner side in the radial direction R. The concentric winding portion is the first concentric winding portion, and the concentric winding portion wound in the counterclockwise direction when viewed from the inside in the radial direction R is the second concentric winding portion.

  Here, each of the plurality of concentric winding portions is connected to the series coil portion 20 disposed on the circumferential first direction C1 side with respect to the other concentric winding portions adjacent to the connection terminal 90 side in the electrical connection relationship. A series coil portion (X represents an odd number) is provided, and each of the plurality of concentric winding portions is disposed on the second circumferential direction C2 side with respect to the other concentric winding portions adjacent to the connection terminal 90 side in the electrical connection relationship. The serial coil portion 20 is referred to as a Y-th serial coil portion (Y represents an even number). In the present embodiment, each of the phase coils 2 includes a first series coil part 21 and a third series coil part 23 as the Xth series coil part, and a second series coil part 22 and a first series coil part as the Yth series coil part. Four series coil portions 24 are provided.

  Of the plurality of concentric winding portions constituting the series coil portion 20, at least one concentric winding portion continuous from the end portion side opposite to the neutral point 91 (that is, the connection terminal 90 side) is the end portion side. The concentric winding 44 is used. In the present embodiment, the concentric winding portion constituting the end portion on the connection terminal 90 side among the plurality of concentric winding portions constituting the series coil portion 20 is defined as the end side concentric winding portion 44. That is, N concentric winding portions (N represents an integer of 1 or more) continuous from the end side on the connection terminal 90 side among the plurality of concentric winding portions provided in the series coil portion 20 are end side concentric winding portions. Assuming 44, in this embodiment, N is set to “1”. Therefore, when a plurality of concentric winding parts with which series coil part 20 is provided are made into a 1st coil part, a 2nd coil part, ... sequentially from connecting terminal 90 side, in this embodiment, the 1st coil part is an end side. Concentric winding part 44 is constituted. In the present embodiment, each of the series coil portions 20 includes a first coil portion 51, a second coil portion 52, a third coil portion 53, and a fourth coil portion 54.

  As shown in FIG.2 and FIG.4, about the 1st series coil part 21 and the 3rd series coil part 23 of the U-phase coil 2U, the 1st coil part 51 and the 3rd coil part 53 are the 1st concentric winding part 41. The second coil part 52 and the fourth coil part 54 are constituted by the second concentric winding part 42. As for the second series coil part 22 and the fourth series coil part 24 of the U-phase coil 2U, the first coil part 51 and the third coil part 53 are constituted by the second concentric winding part 42, and the second coil The part 52 and the fourth coil part 54 are constituted by the first concentric winding part 41. The same applies to the V-phase coil 2V as shown in FIG. 5 shows the phase coils 2 (U-phase coil 2U, V-phase coil 2V, and W-phase coil 2W) provided in the coil 1 in the circumferential direction so that the inner side in the radial direction R is the front side of the drawing. FIG. In FIG. 5, in order to avoid complication, a symbol “51” representing the first coil portion, a symbol “52” representing the second coil portion, a symbol “53” representing the third coil portion, and the fourth coil portion are represented. Although not denoted by “54”, as described above, the first coil portion and the second coil portion are arranged in order from the concentric winding portion on the connection terminal 90 side along the extending direction of the linear conductor constituting the phase coil 2. They are a coil part, a 3rd coil part, and a 4th coil part.

  On the other hand, as shown in FIG. 5, for the first series coil portion 21 and the third series coil portion 23 of the W-phase coil 2 </ b> W, the first coil portion 51 and the third coil portion 53 are formed by the second concentric winding portion 42. In addition, the second coil part 52 and the fourth coil part 54 are constituted by the first concentric winding part 41. As for the second series coil part 22 and the fourth series coil part 24 of the W-phase coil 2W, the first coil part 51 and the third coil part 53 are constituted by the first concentric winding part 41, and the second coil The part 52 and the fourth coil part 54 are constituted by the second concentric winding part 42.

  Next, an arrangement configuration of a plurality of concentric winding portions provided in the U-phase coil 2U will be described with reference to FIGS. As shown in FIGS. 3 and 4, each of the first concentric winding portions 41 is opposed to the other first concentric winding portions 41 constituting the same series coil portion 20 as the first concentric winding portion 41 in the radial direction R. And each of the second concentric winding portions 42 is opposed to the other second concentric winding portion 42 constituting the same series coil portion 20 as the second concentric winding portion 42 in the radial direction R. Is arranged. Here, being opposed to the radial direction R means that the arrangement regions of the concentric winding portions are different from each other by 180 degrees with respect to the position in the circumferential direction C of the core 11. In this way, each of the plurality of concentric winding portions constituting the series coil portion 20 is opposed to the other concentric winding portion (the winding direction is the same direction) constituting the series coil portion 20 in the radial direction R. Thus, even if the rotor is arranged in an eccentric state with respect to the stator 10 due to an assembly error or the like, the reference reverse in the state in which the rotor is arranged concentrically with respect to the stator 10 The fact that the magnitude and direction of the back electromotive voltage change from the electromotive voltage is non-uniform among the plurality of series coil parts 20 constituting the in-phase parallel circuit, This can be suppressed as compared with the case where the concentric winding portions are concentrated on a partial region in the circumferential direction C. The counter electromotive voltage in the series coil unit 20 is generated with the rotation of the rotor. As a result, generation of circulating current in a parallel circuit formed by a plurality of in-phase series coil units 20 can be suppressed, or even when circulating current is generated in the parallel circuit, the size is reduced. can do.

  In this embodiment, as shown in FIG.3 and FIG.4, about the 1st series coil part 21, the 1st coil part 51, the 2nd coil part 52, and the 3rd coil toward the circumferential first direction C1 side. The second coil unit 53 and the fourth coil unit 54 are arranged in this order, and the second series coil unit 22 has a first coil unit 51, a second coil unit 52, and a third coil unit 53 toward the circumferential second direction C2. And the fourth coil portion 54 are arranged in this order. In this example, for each of the first series coil portion 21 and the second series coil portion 22, the second coil portion 52 is a concentric winding portion disposed adjacent to the first coil portion 51 in the circumferential direction C. It is. In the present example, the first coil portion 51 of the second series coil portion 22 is concentrically wound adjacent to the first coil portion 51 of the first series coil portion 21 on the circumferential second direction C2 side. Part.

  And as shown in FIG. 4, the 3rd series coil part 23 is comprised similarly to the 1st series coil part 21 except the arrangement position of the circumferential direction C, and in this example, the 3rd series coil part 23 is The first series coil portion 21 is disposed on the second circumferential direction C2 side in a positional relationship shifted by 6 times the magnetic pole pitch P. Moreover, the 4th series coil part 24 is comprised similarly to the 2nd series coil part 22 except the arrangement position of the circumferential direction C, and the 4th series coil part 24 is set to the 2nd series coil part 22 in this example. On the other hand, they are arranged on the first circumferential direction C1 side in a positional relationship shifted by 6 times the magnetic pole pitch P. In order to provide such an arrangement configuration, each first coil portion 51 of the first series coil portion 21 and the second series coil portion 22 is constituted by two concentric winding portions arranged adjacent to each other in the circumferential direction C. Is done. On the other hand, the first coil part 51 of the third series coil part 23 or the fourth series coil part 24 is in the circumferential direction C with respect to the first coil part 51 of the first series coil part 21 or the second series coil part 22. It is constituted by concentric winding portions that are not adjacent to each other and are spaced apart by at least twice the magnetic pole pitch P. Further, in this example, the first coil parts 51 of the third series coil part 23 and the fourth series coil part 24 are not adjacent to the circumferential direction C and are spaced apart by at least twice the magnetic pole pitch P. Consists of two concentric windings. In addition, the separation distance in the circumferential direction C of the two concentric winding portions is the separation distance of the center position in the circumferential direction C of each concentric winding portion.

  As shown in FIG. 5, the V-phase coil 2 </ b> V is configured in the same manner as the U-phase coil 2 </ b> U except for the arrangement position in the circumferential direction C. That is, each of the first series coil unit 21, the second series coil unit 22, the third series coil unit 23, and the fourth series coil unit 24 included in the V-phase coil 2V is except for the arrangement position in the circumferential direction C. The first series coil portion 21, the second series coil portion 22, the third series coil portion 23, and the fourth series coil portion 24 of the U-phase coil 2U are configured in the same manner.

  On the other hand, for the W-phase coil 2W, in addition to excluding the arrangement position in the circumferential direction C, the corresponding concentric winding part (for example, the first coil part 51 of the first series coil part 21 of the U-phase coil 2U, The winding directions of the first coil portion 51 of the first series coil portion 21 of the W-phase coil 2W are opposite to each other, and the arrangement configuration of the winding portion 33 (details will be described later) are different. Except for this, the configuration is the same as that of the U-phase coil 2U. Specifically, for the first series coil portion 21, the first coil portion 51, the second coil portion 52, the third coil portion 53, and the fourth coil portion 54 are directed toward the circumferential first direction C1. About the point arrange | positioned in order and the 2nd series coil part 22, the 1st coil part 51, the 2nd coil part 52, the 3rd coil part 53, and the 4th coil part 54 toward the circumferential second direction C2 side. The W-phase coil 2W is the same as the U-phase coil 2U in that they are arranged in this order. The third series coil unit 23 is configured in the same manner as the first series coil unit 21 except for the arrangement position in the circumferential direction C, and the third series coil unit 23 is formed in the first series coil unit 21. On the other hand, the fourth series coil portion 24 is disposed on the second circumferential direction C2 side in a positional relationship shifted by 6 times the magnetic pole pitch P, and the fourth series coil portion 24 is arranged in the second series coil portion except for the arrangement position in the circumferential direction C. 22, and the fourth series coil portion 24 is arranged in a positional relationship shifted by 6 times the magnetic pole pitch P on the circumferential first direction C1 side with respect to the second series coil portion 22. However, the W-phase coil 2W is the same as the U-phase coil 2U.

  However, the first coil part 51 provided in the first series coil part 21 and the third series coil part 23 of the U-phase coil 2U is the first concentric winding part 41, and the second series coil part 22 of the U-phase coil 2U and The first coil part 51 provided in the fourth series coil part 24 is the second concentric winding part 42, whereas the first coil provided in the first series coil part 21 and the third series coil part 23 of the W-phase coil 2W. The part 51 is the second concentric winding part 42, and the first coil part 51 provided in the second series coil part 22 and the fourth series coil part 24 of the W-phase coil 2 </ b> W is the first concentric winding part 41.

  As shown in FIG. 5, each of the U-phase coil 2U, the V-phase coil 2V, and the W-phase coil 2W has an arrangement region in the circumferential direction C of the end side concentric winding portion 44, and the end side of the other phase. It arrange | positions so that it may not have a part which overlaps with the arrangement | positioning area | region of the circumferential direction C of the concentric winding part 44. FIG. That is, the arrangement area in the circumferential direction C of each end side concentric winding part 44 is set so as not to overlap with the arrangement area in the circumferential direction C of the end side concentric winding part 44 of the other phase. Yes. Here, when the arrangement region in the circumferential direction C of the end-side concentric winding portion 44 is an end region, in this embodiment, the U-phase end region corresponds to each of the U phase, the V phase, and the W phase. 80U, V-phase end region 80V, and W-phase end region 80W are formed. In the present embodiment, each of the phase coils 2 includes four end-side concentric winding portions 44 corresponding to the provision of the four series coil portions 20. Therefore, in this embodiment, as shown in FIG. 5, each of the end regions of each phase, that is, the U-phase end region 80U, the V-phase end region 80V, and the W-phase end region 80W has four The end side concentric winding portion 44 (in this example, the first coil portion 51) is formed by the sum of the arrangement regions in the circumferential direction C.

  Moreover, in this embodiment, the 1st coil part 51 of the 1st series coil part 21, the 2nd coil part 52 of the 1st series coil part 21, the 3rd coil part 53 of the 3rd series coil part 23, the 3rd The fourth coil portion 54 of the series coil portion 23, the second coil portion 52 of the fourth series coil portion 24, the first coil portion 51 of the fourth series coil portion 24, and so on, in this order toward the circumferential first direction C1. The arrangement order in the circumferential direction C of the first coil part 51, the second coil part 52, the third coil part 53, and the fourth coil part 54 of each series coil part 20 is the phase coil of each phase. Common between the two. Therefore, as shown in FIG. 5, the end region of each phase is formed in the same manner except for the formation position in the circumferential direction C. That is, the end region of each phase is formed so as to completely overlap each other when shifted in the circumferential direction C.

  By the way, as described above, the end side concentric winding portion 44 is at least one (1 in this example) continuous from the end side on the connection terminal 90 side among the plurality of concentric winding portions constituting the series coil portion 20. Are concentric winding parts. That is, each of the end-side concentric winding portions 44 is arranged on the end side of a series circuit in which two different phase coils 2 are connected in series via a neutral point 91. Therefore, the potential difference between the phase coils 2 of two different phases is likely to increase between the end side concentric winding portions 44 of the two phases. In this regard, as described above, the arrangement region in the circumferential direction C of the end-side concentric winding portion 44 has a portion overlapping with the arrangement region in the circumferential direction C of the end-side concentric winding portion 44 of the other phase. It is set not to. That is, each of the end-side concentric winding portions 44 is disposed in a region in a circumferential direction C different from that of the other-phase end-side concentric winding portion 44 where the potential difference between the end-side concentric winding portions 44 tends to increase. Is done. Therefore, compared with the case where each arrangement | positioning area | region of the circumferential direction C of the edge part side concentric winding part 44 has a part which overlaps with the arrangement | positioning area | region of the circumferential direction C of the edge part side concentric winding part 44 of another phase, mutually different phases. The maximum potential difference between the phase coils 2 at a portion where the phase coils 2 are arranged in contact with or close to each other at the coil end portion can be suppressed. As a result, for example, the electrical performance between the phase coils 2 of each phase can be reduced only by the insulating film formed on the surface of the linear conductor without reducing the insulation performance required for the interphase insulating member or without providing the interphase insulating member. Therefore, it is possible to reduce the manufacturing cost of the stator 10 and to reduce the size of the coil end portion. 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.

  As shown in FIGS. 2 to 4, the connecting wire 30 according to the present embodiment includes a winding portion 33 that is wound concentrically around the target concentric winding portion 43. Here, the target concentric winding part 43 is a concentric winding part (the first concentric winding part 41 or the second concentric winding part 42) that constitutes another series coil part 20 of the same phase. The “other series coil unit 20” is a series coil unit 20 that is different from the series coil unit 20 in which the connection conducting wire 30 is provided. The winding direction of the winding part 33 is set in the same direction as the winding direction of the target concentric winding part 43. That is, when the coil 1 is energized, the winding portion 33 forms a magnetic pole in the same direction as the target concentric winding portion 43. Then, the number of turns of the target concentric winding part 43 is set to be smaller by the number of turns of the winding part 33 than the concentric winding part that is not the target concentric winding part 43. Therefore, the number of turns in each slot 12 of the core 11 is constant. In the present embodiment, the winding number of the winding unit 33 is set to “1”. In the present embodiment, only a part of the connection conductors 30 (three connection conductors in this example) included in the series coil unit 20 includes the winding part 33. In addition, it is also possible to set the winding frequency of the winding part 33 to a value of 2 or more.

  The target concentric winding portion 43 includes a plurality of concentric winding portions disposed between the circumferential directions C of two concentric winding portions (the first concentric winding portion 41 and the second concentric winding portion 42) connected by the connection conductor 30. The setting is made based on a predetermined selection condition. In this embodiment, a first selection condition and a second selection condition are set as selection conditions, and the selection condition is satisfied by satisfying both the first selection condition and the second selection condition. The first selection condition is a condition that a concentric winding portion other than the end side concentric winding portion 44 is used. That is, in the present embodiment, the target concentric winding portion 43 is set to a concentric winding portion other than the end side concentric winding portion 44. As shown in FIGS. 3 and 4, the connecting wire 30 includes a first extending portion 31 extending from one end of the winding portion 33 to one concentric winding portion to be connected, and the other end of the winding portion 33. And a second extending portion 32 extending to the other concentric winding portion to be connected. In this example, the first extending portion 31 extends from one end of the winding portion 33 (the end portion on the first concentric winding portion 41 side to be connected in the electrical connection relationship) to the first concentric winding portion 41 to be connected. The second extending portion 32 extends from the other end of the winding portion 33 (the end portion on the second concentric winding portion 42 side to be connected in the electrical connection relationship) from the second concentric winding portion to be connected. 42 is a portion extending to 42. In the present embodiment, the second selection condition is set such that the arrangement regions in the circumferential direction C of the first extending portion 31 and the second extending portion 32 do not overlap each other. That is, in the present embodiment, the winding direction of the winding portion 33 is such that the two extending portions (the first extending portion 31 and the second extending portion 32) of the connection conducting wire 30 extending from both ends of the winding portion 33. The concentric winding portion 43 is set from one of the first concentric winding portion 41 and the second concentric winding portion 42 so that the arrangement region in the circumferential direction C of FIG.

  Specifically, in the present embodiment, since the first coil portion 51 constitutes the end-side concentric winding portion 44, the second coil portion 52 and the third coil portion which are coil portions other than the first coil portion 51. Each of 53 and the fourth coil portion 54 satisfies the first selection condition. Further, like the first series coil portion 21, the first coil portion 20 that has a circumferential first direction C <b> 1 in the direction from the first coil portion 51 to the second coil portion 52 along the circumferential direction C is the first The concentric winding portion 41 satisfies the second selection condition, and the direction from the first coil portion 51 to the second coil portion 52 along the circumferential direction C is the circumferential second direction C2 as in the second series coil portion 22. The second concentric winding portion 42 satisfies the second selection condition for the series coil portion 20 that becomes the following.

  In the present embodiment, when there are a plurality of concentric windings that satisfy the above selection conditions between the circumferential directions C of the two concentric windings connected by the connecting wire 30, in other words, the target concentric windings When there are a plurality of candidate concentric windings 43, there are two concentric windings (first concentric winding part 41 and second concentric winding part 42) to be connected by the connecting conductor 30 between the circumferential directions C. The concentric winding portion in which the difference in the extending length in the circumferential direction C between each of the first extending portion 31 and the second extending portion 32 is the smallest is set as the target concentric winding portion 43. That is, in the present embodiment, one connection conductor 30 includes one winding portion 33. In the present embodiment, the extending length in the circumferential direction C of the first extending portion 31 and the second extending portion 32 between the circumferential directions C of the two concentric winding portions to be connected by the connecting conductor 30 is as follows. It is set as the extension length in the area | region of the circumferential direction C between the circumferential direction C of the said 2 concentric winding part except the arrangement | positioning area | region of each circumferential direction C of the said 2 concentric winding part. Below, the extension length of the circumferential direction C of the 1st extension part 31 or the 2nd extension part 32 means the extension length in this area | region.

  The first series coil portion 21 of the U-phase coil 2U will be specifically described with reference to FIGS. 3 and 4. The circumferential direction of the second coil portion 52 and the third coil portion 53 connected by the connection conductor 30. Between C, three concentric windings satisfying the above selection conditions are arranged. Specifically, as shown in FIG. 4, in order from the circumferential second direction C2 side, the third coil portion 53 of the third series coil portion 23, the second coil portion 52 of the fourth series coil portion 24, and the first Three concentric winding portions with the fourth coil portion 54 of the two series coil portions 22 satisfy the above selection condition. Here, when the 3rd coil part 53 of the 3rd series coil part 23 is set as the object concentric winding part 43, the extension of each circumferential direction C of the 1st extension part 31 and the 2nd extension part 32 When the difference in length becomes a value corresponding to five times the magnetic pole pitch P and the fourth coil portion 54 of the second series coil portion 22 is set as the target concentric winding portion 43, the first extension portion 31 and the first extension portion 31 While the difference in the extension length of each of the two extending portions 32 in the circumferential direction C is a value corresponding to three times the magnetic pole pitch P, the second coil portion 52 of the fourth series coil portion 24 is concentric. When the winding portion 43 is set, the difference between the extending lengths of the first extending portion 31 and the second extending portion 32 in the circumferential direction C is a value corresponding to one time the magnetic pole pitch P. Therefore, in the first series coil part 21, the second coil part 52 of the fourth series coil part 24 is set to the target concentric winding part 43. As shown in FIG. 4, also about the 2nd series coil part 22, the 3rd series coil part 23, and the 4th series coil part 24 of the U-phase coil 2U, the 2nd coil part 52 of the other series coil part 20 of the same phase. Is set in the target concentric winding part 43.

  As described above, the V-phase coil 2V is configured in the same manner as the U-phase coil 2U except for the arrangement position in the circumferential direction C. Therefore, as shown in FIG. 5, for each series coil portion 20 of the V-phase coil 2 </ b> V, the second coil portion 52 of the other series coil portion 20 in the same phase is set as the target concentric winding portion 43. In FIG. 5, in order to avoid complication, the symbol “43” representing the target concentric winding portion is not attached, but the concentric winding portion disposed at the same position in the circumferential direction C as the winding portion 33 is not provided. The target concentric winding part. On the other hand, the W-phase coil 2W is different from the U-phase coil 2U and the V-phase coil 2V in the arrangement configuration of the winding part 33. Specifically, for the first series coil portion 21 and the second series coil portion 22 of the W-phase coil 2W, the fourth coil portion 54 of the other series coil portion 20 of the same phase is set as the target concentric winding portion 43. As for the third series coil part 23 and the fourth series coil part 24 of the W-phase coil 2W, the third coil part 53 of the other series coil part 20 of the same phase is set as the target concentric winding part 43.

  As described above, when the connecting wire 30 includes the winding portion 33, the winding portion 33 can be held using the jig that holds the target concentric winding portion 43 when the stator 10 is manufactured. it can. That is, since a part of the connecting wire 30 (the portion where the winding portion 33 is formed) can be held at the time of manufacturing the stator 10, the manufacturing quality of the stator 10 can be improved. For example, the stator 10 may be manufactured by winding each phase coil 2 around the core 11 by an insert method or the like in the order of the U-phase coil 2U, the V-phase coil 2V, and the W-phase coil 2W. It is done. In this case, for example, when the V-phase coil 2V comes into contact with the connecting wire 30 of the U-phase coil 2U already wound around the core 11 when the V-phase coil 2V is wound around the core 11, the degree of the contact Depending on the situation, the manufacturing quality (shape accuracy, insulation performance, etc.) of the stator 10 may be reduced. In this regard, in the coil 1 according to the present embodiment, since a part of the connecting wire 30 can be held at the time of manufacturing the stator 10, contact between the phase coils 2 of different phases at the time of manufacturing the stator 10 is avoided. In other words, it is easy to keep the degree of contact low, and the manufacturing quality of the stator 10 can be appropriately ensured.

  Further, the target concentric winding part 43 is set based on the second selection condition, and the winding number of the target concentric winding part 43 is set to be greater than that of the concentric winding part that is not the target concentric winding part 43. Since the number of times is set to be smaller, the slots 12 around which the target concentric winding portion 43 is wound are connected to the core 11 on the outer side in the axial direction than in the case where the connecting wire 30 does not include the winding portion 33. Without increasing the volume of the linear conductor, it is possible to reduce the volume of the portion of the connecting conductor 30 that is disposed on the outer side in the axial direction with respect to the core 11. Therefore, the coil end portion can be reduced in size by providing the connecting wire 30 with the winding portion 33.

  Further, in the present embodiment, the first selection condition is set as the selection condition. Therefore, the connecting wire 30 includes the winding portion 33 while suppressing an increase in the maximum potential difference between the phase coils 2 in a portion where the phase coils 2 of different phases are arranged in contact with or close to each other at the coil end portion. A configuration can be realized. If it demonstrates supplementarily, when the object concentric winding part 43 is set to the concentric winding part (this embodiment 1st coil part 51) which comprises the edge part side concentric winding part 44, only the winding | turns count of the winding part 33 will be sufficient as it. Since the number of turns of the target concentric winding portion 43 decreases, the potential difference between the end on the neutral point 91 side of the end side concentric winding portion 44 and the connection terminal 90 (in-phase connection terminal 90, the same shall apply hereinafter). The amount of winding of the target concentric winding portion 43 is reduced by a decrease. Accordingly, the adjacent concentric winding part (second coil part 52 in the present embodiment) that is a concentric winding part connected to the neutral point 91 side with respect to the end side concentric winding part 44 and the connection terminal 90. The potential difference between them is also reduced.

  As a result, when the arrangement region in the circumferential direction C of the second coil portion 52 overlaps with the arrangement region in the circumferential direction C of the first coil portion 51 of the other phase as in the example shown in FIG. Depending on the arrangement configuration, the maximum potential difference may be increased. On the other hand, in the present embodiment, by setting the first selection condition as the selection condition, the target concentric winding part 43 is set to a concentric winding part other than the end side concentric winding part 44, and thus the maximum potential difference described above. The winding portion 33 can be provided on the connecting wire 30 while avoiding a decrease in the potential difference between the adjacent concentric winding portion and the connection terminal 90, which can increase the width of the connection lead wire 90. That is, in this embodiment, the arrangement area in the circumferential direction C of each end side concentric winding part 44 does not have a portion overlapping the arrangement area in the circumferential direction C of the end side concentric winding part 44 of the other phase. The coil end portion that can be achieved by setting as described above can be further reduced in size by providing the connecting portion 30 with the winding portion 33.

  Furthermore, when there are a plurality of concentric winding parts that are candidates for the target concentric winding part 43, the difference in the extension lengths in the circumferential direction C between the first extension part 31 and the second extension part 32 is the largest. The smaller concentric winding part is set as the target concentric winding part 43. Therefore, the extension length of one circumferential direction C of the first extension portion 31 and the second extension portion 32 is such that the manufacturing quality of the stator 10 can be lowered by contact with the phase coil 2 of the other phase. The length can be avoided and the manufacturing quality of the stator 10 can be further improved. In addition, as mentioned above, the extension length of the circumferential direction C of the 1st extension part 31 and the 2nd extension part 32 is between the circumferential directions C of the two concentric winding parts of the connection object by the connection conducting wire 30. The extension length in the region in the circumferential direction C excluding the region in the circumferential direction C of each of the two concentric windings is that in the circumferential direction C of the two concentric windings in the connecting wire 30. This is because the portion arranged in the arrangement region is less likely to come into contact with the phase coil 2 of the other phase when the stator 10 is manufactured, as much as the two concentric winding portions exist.

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 configuration in which N is set to “1”, in other words, the case where the first coil portion 51 forms the end-side concentric winding portion 44 has been described as an example. However, the embodiment of the present invention is not limited to this, and N can be set to an integer of 2 or more. For example, a configuration in which N is “2”, that is, a configuration in which the end side concentric winding portion 44 is configured by both the first coil portion 51 and the second coil portion 52 may be employed. Moreover, the number of the slots 12 formed in the core 11 is J, the number of the slots 12 overlapping with the arrangement region in the circumferential direction C of one concentric winding is K, and the series coil unit 20 included in one phase coil 2. It is also possible to set the value of the integer part of {J / (K × L × M)} where N is L and M is the number of phases of the coil 1. In the example of the above embodiment, since J = 96, K = 6, L = 4, and M = 3, the value of the integer part of {J / (K × L × M)} is “1”. is there. For example, unlike the above embodiment, when L is set to “2”, the value of the integer part of {J / (K × L × M)} is “2”.

(2) In the above embodiment, when there are a plurality of concentric windings that satisfy a predetermined selection condition between the circumferential directions C of the two concentric windings connected by the connection conducting wire 30, the connecting conducting wire 30. The difference between the extending lengths of the first extending portion 31 and the second extending portion 32 in the circumferential direction C between the circumferential directions C of the two concentric winding portions to be connected is the smallest concentric winding portion. Is described as an example of a configuration in which the target concentric winding portion 43 is set. However, the embodiment of the present invention is not limited to this, and the extension in the circumferential direction C of each of the first extension portion 31 and the second extension portion 32 among the concentric winding portions that satisfy a predetermined selection condition. A concentric winding portion different from the concentric winding portion having the smallest difference in length can be set as the target concentric winding portion 43. In the above-described embodiment, the case where one connection conductor 30 includes one winding portion 33 has been described as an example. However, one connection conductor 30 has a plurality of winding portions 33 at different positions in the circumferential direction C. It can also be set as the structure provided with. For example, a plurality of target concentric winding parts 43 are set corresponding to each of all the concentric winding parts that satisfy the above selection conditions, and the connection conductor 30 is wound around each of the plurality of target concentric winding parts 43. The winding portion 33 can be provided.

(3) In the above embodiment, the configuration in which only one connection conductor 30 of the plurality of connection conductors 30 included in the series coil unit 20 includes the winding part 33 has been described as an example. However, the embodiment of the present invention is not limited to this, and the connecting wire 30 in which the concentric winding satisfying the above selection condition exists between the circumferential directions C of the two concentric windings to be connected is a series coil. In the case where a plurality of parts 20 are provided, two or more connection conductors 30 of the plurality of connection conductors 30 provided in the series coil part 20 may be provided with a winding part 33. Note that any of the plurality of connecting wires 30 included in the series coil unit 20 may be configured not to include the winding unit 33.

(4) In the above embodiment, the case where both the first selection condition and the second selection condition are set as the selection condition of the target concentric winding part 43 has been described as an example. However, the embodiment of the present invention is not limited to this, and only one of the first selection condition and the second selection condition may be set as the selection condition.

(5) In the above embodiment, the case where each of the phase coils 2 includes a plurality of series coil portions 20 connected in parallel to each other 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 one series coil unit 20.

(6) In the above-described embodiment, the series coil unit 20 includes the first concentric winding unit 41 and the second concentric winding unit 42, and the first concentric winding unit 41 and the second concentric winding unit 42 alternately. The case where it is configured to be connected in series so as to be described as an example. However, the embodiment of the present invention is not limited to this, and as the series coil portion 20, a coil portion configured by connecting a plurality of first concentric winding portions 41 in series and a plurality of second concentric winding portions 42 in series. The coil part connected and comprised can also be set as the structure with which the phase coil 2 is equipped.

(7) 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.

  The present invention is a structure in which a core having a plurality of slots distributed in the circumferential direction of a cylindrical core reference surface is wound and a phase coil corresponding to each of a plurality of phases is star-connected. It can be used for an electric coil.

1: Coil (coil for rotating electrical machines)
2: Phase coil 11: Core 12: Slot 20: Series coil part 30: Connection wire 31: First extension part (extension part)
32: Second extension part (extension part)
33: Winding part 41: First concentric winding part (concentric winding part)
42: Second concentric winding part (concentric winding part)
43: Object concentric winding part 44: End side concentric winding part 91: Neutral point C: Circumferential direction S: Core reference plane

The core coil according to the present invention is wound around a core having a plurality of slots dispersedly arranged in the circumferential direction of a cylindrical core reference surface, and a phase coil corresponding to each of a plurality of phases is star-connected. Each of the phase coils includes a series coil portion in which a plurality of concentric winding portions are connected in series, and the plurality of concentric windings constituting the series coil portion. A part of the concentric winding part, wherein at least one concentric winding part continuous from the end side opposite to the neutral point is defined as an end side concentric winding part, and the end side Each of the concentric winding portions has a circumferential arrangement area that is set so as not to overlap with the circumferential arrangement area of the end-side concentric winding portion of the other phase.

Claims (5)

A coil for a rotating electrical machine that is wound around a core having a plurality of slots dispersedly arranged in the circumferential direction of a cylindrical core reference surface, and a phase coil corresponding to each of a plurality of phases is star-connected. There,
Each of the phase coils includes a series coil portion configured by connecting a plurality of concentric winding portions in series with each other,
Among the plurality of concentric winding parts constituting the series coil part, at least one concentric winding part continuous from the end side opposite to the neutral point is used as an end side concentric winding part.
Rotation that is set so that each circumferential arrangement region of the end side concentric winding portion does not overlap with the circumferential arrangement region of the end side concentric winding portion of another phase Electric coil. The phase coil includes a plurality of the series coil portions connected in parallel to each other,
The connecting wire connecting the two concentric winding parts connected in series with each other in the series coil part is concentric with respect to the target concentric winding part which is the concentric winding part constituting the other series coil part in phase. With a winding part wound around,
The number of turns of the target concentric winding part is set to be less by the number of turns of the winding part than the concentric winding part that is not the target concentric winding part,
The rotating electrical machine coil according to claim 1, wherein the target concentric winding part is set in the concentric winding part other than the end side concentric winding part. The series coil portion includes a first concentric winding portion and a second concentric winding portion which are the concentric winding portions whose winding directions are opposite to each other, and the first concentric winding portion and the second concentric winding portion are 1 It is configured in series so as to alternate each other,
The first direction so that the winding direction of the winding part is a winding direction in which the circumferentially arranged areas of the two extending parts of the connection conductor extending from both ends of the winding part do not overlap each other. The rotating electrical machine coil according to claim 2, wherein the target concentric winding part is set from either a concentric winding part or the second concentric winding part. The target concentric winding portion is set based on a predetermined selection condition from among the plurality of concentric winding portions disposed between the circumferential directions of the two concentric winding portions connected by the connection conductor. ,
The connecting wire includes a first extending portion extending from one end of the winding portion to the concentric winding portion of one connection target, and a first extension portion extending from the other end of the winding portion to the concentric winding portion of the other connection target. Two extending parts,
When there are a plurality of the concentric winding portions that satisfy the selection condition, the first extension portion and the second extension portion between the circumferential directions of the two concentric winding portions to be connected by the connection conducting wire. The coil for rotating electrical machines according to claim 2 or 3, wherein the concentric winding portion having the smallest difference in the extension length in the circumferential direction is set as the target concentric winding portion. The N concentric winding portions (N represents an integer of 1 or more) continuous from the end portion side opposite to the neutral point are referred to as the end portion side concentric winding portions,
The number of the slots formed in the core is J, the number of the slots overlapping with the circumferential arrangement region of one concentric winding is K, and the series coil portion of one phase coil includes 5. The rotating electrical machine according to claim 1, wherein the value of the integer part of {J / (K × L × M)} is N, where L is the number and M is the number of phases. Coil.

Images