JP2011182524A - Armature for rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an armature for rotary electric machine wherein the coil can be wound easily around the core, electrical insulation can be ensured easily between the conductors, and design flexibility is high. <P>SOLUTION: The armature for rotary electric machine includes a first wave winding coil 61 which is formed to round in the circumferential direction C by connecting the adjoining connection/extension portions 51 of the first segment conductor 41 sequentially, and a second wave winding coil 62 which is formed to round in the circumferential direction C by connecting the adjoining connection/extension portions 51 of the second segment conductor 42 sequentially, wherein the connection/transition portion 53 of the first wave winding coil 61 is arranged to overlap the continuous transition portion 52 of the second wave winding coil 62 on the other side L2 in the axial direction, and the connection/transition portion 53 of the second wave winding coil 62 is arranged to overlap the continuous transition portion 52 of the first wave winding coil 61 on one side L1 in the axial direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention includes an armature core in which a plurality of slots extending in the axial direction of a cylindrical core reference surface are distributed in the circumferential direction of the core reference surface, and a coil wound around the armature core. The present invention relates to an armature for a rotating electric machine.

  In order to increase the space factor of a coil in an armature for a rotating electrical machine, a technique is already known in which a coil is formed by winding a linear conductor (flat wire) having a rectangular cross section around an armature core. For example, Patent Document 1 below describes a technique in which a continuous rectangular wire is bent to form a corrugated coil, and the corrugated coil is inserted from the inside in the radial direction of the core. Patent Document 2 below describes a technique for forming a continuous wave-like coil by joining a plurality of segment conductors using a rectangular wire segment conductor formed in a substantially V-shape. Yes. In the technique described in Patent Document 2, the segment conductors inserted from one side in the axial direction of the core and the segment conductors inserted from the other side in the axial direction of the core are alternately arranged, thereby connecting the joint portions of the segment conductors to the core. The electrical insulation of the coil is enhanced by suppressing the short circuit of the joint portion.

U.S. Pat. No. 7,005772 B1 JP 2002-078269 A

  In the technique described in Patent Document 1 described above, when the corrugated coil is inserted from the inside in the radial direction of the core, the corrugated coil formed in an annular shape in accordance with the shape of the core is temporarily To be smaller than the inner peripheral surface of the core and placed inside the core in the radial direction, and then enlarged in the radial direction and wound around the core. In such a winding method, it is necessary to deform the coil twice, and since such deformation is accompanied by plastic deformation of the conductor constituting the coil, it is also necessary to correct the coil shape after winding. Therefore, many processing steps are required to wind the coil around the core, which increases the manufacturing cost. Further, since it is necessary to insert the coil into the slot of the core while deforming the coil, there is a possibility that the coil contacts the core and the insulating film on the coil surface is damaged.

  On the other hand, in the technique described in Patent Document 2 described above, the above-described problems are unlikely to occur. However, in the technique of Patent Document 2, each segment conductor has a pair of conductor side portions arranged in the slot of the core, but the radial positions of the pair of conductor side portions are shifted from each other by one conductor. The shape is different. Therefore, the corrugated coil for one circumference of the core configured by connecting a plurality of the segment conductors is alternately arranged at the radially outer position and the radially inner position in each slot along the circumferential direction. become. Since such a wave-like coil needs to be wound around the core as a set of two rounds of the core, the number of conductors arranged in the radial direction in the slot must be an even number. The number of conductors in the direction cannot be an odd number. However, since the magnitude of the torque and back electromotive force that can be generated varies depending on the number of turns (number of turns) of the rotating electrical machine, the number of radial conductors in the slot is an odd number to obtain the required characteristics. It may be desirable to The technique of Patent Document 2 has a problem that the degree of freedom in design of the rotating electrical machine in such a case is low.

  Therefore, it is desired to realize an armature for a rotating electrical machine that can easily wind a coil around a core, easily secure electrical insulation between conductors, and has a high degree of design freedom.

  An armature core according to the present invention in which a plurality of slots extending in the axial direction of a cylindrical core reference surface are distributed in the circumferential direction of the core reference surface, and a coil wound around the armature core. A characteristic configuration of the armature for a rotating electrical machine provided is that the coil includes a pair of conductor side portions disposed along the axial direction in the pair of slots having different circumferential positions, and an outer side in the axial direction of the armature core. And a pair of joint extending portions extending from the other end of each of the pair of conductor side portions outward in the axial direction of the armature core; The first segment conductor is a segment conductor formed by using a plurality of segment conductors formed of continuous conductors, and the continuous crossing portion is disposed on one side in the axial direction with respect to the armature core. Multiple distributed arrangements A first wave-wound coil in which the joint extension portions of the first segment conductors adjacent to each other are sequentially joined to make a round in the circumferential direction, and the continuous crossing portion is connected to the armature core. A plurality of second segment conductors, which are the segment conductors arranged on the other side in the axial direction, are dispersedly arranged along the circumferential direction, and the joint extension portions of the second segment conductors adjacent to each other are sequentially joined together. A second wave coil having a wave shape that makes a round in the circumferential direction, the conductor side portion on one side in the circumferential direction of the first segment conductor, and the second segment disposed adjacent to the first segment conductor The conductor side of the segment conductor constituting the first wave winding coil and the second wave winding coil is disposed in the slot adjacent to each other and the conductor side portion on the other circumferential side of the segment conductor Are arranged at the same radial position, and are formed on the other side in the axial direction of the armature core by joining the joint extension portions of the first segment conductors adjacent to each other. The joining transition part is arranged so as to overlap the other side in the axial direction with respect to the continuous transition part of the second wave winding coil, and joins the joining extension parts of the second segment conductors adjacent to each other. The junction crossing portion of the second wave winding coil formed on one side in the axial direction of the armature core is arranged so as to overlap the one side in the axial direction with respect to the continuous crossing portion of the first wave winding coil. There is in point.

  When the coil includes a plurality of phase coils having different phases, each of the phase coils includes the first wave winding coil and the second wave winding coil configured as described above. Is preferred.

  Further, in the present application, the “rotary electric machine” is used as a concept including a motor (electric motor), a generator (generator), and a motor / generator functioning as both a motor and a generator as necessary.

  According to this characteristic configuration, since the segment conductor is used for the coil, the segment conductor can be easily attached to the armature core slot from the axial direction or the circumferential direction. Therefore, the processing man-hour when winding the coil around the armature core can be reduced. Further, since the segment conductor does not need to be deformed when being mounted in the slot of the armature core and can be easily mounted, the possibility of damaging the insulating film on the surface of the segment conductor can be greatly reduced. Furthermore, according to this characteristic configuration, the coil includes a first wave winding coil in which the joint extension portions of the first segment conductors, in which the continuous crossing portion is disposed on one side in the axial direction with respect to the armature core, are sequentially joined to each other. The continuous crossing portion is configured to include a second wave winding coil in which the joint extension portions of the second segment conductors arranged on the other side in the axial direction with respect to the armature core are sequentially joined. Thereby, the joint part of the joint extension parts in the first wave winding coil and the joint part of the joint extension parts in the second wave winding coil are arranged separately on both sides in the axial direction of the armature core. Therefore, the joint portions of the segment conductors can be dispersed on both sides in the axial direction of the armature core, and the distance between the adjacent joint portions can be secured, so that the electrical insulation of the joint portions can be easily secured. The electrical insulation of the whole coil can be improved.

  Further, according to this characteristic configuration, the conductor side portion on one side in the circumferential direction of the first segment conductor, and the conductor side portion on the other side in the circumferential direction of the second segment conductor disposed adjacent to the first segment conductor, Since they are arranged in slots adjacent to each other, for example, a wave winding coil when the number of slots per pole per phase is “2” can be easily achieved by combining the first wave winding coil and the second wave winding coil. Can be configured. At this time, since the conductor side portions of the segment conductors constituting the first wave winding coil and the second wave winding coil are arranged at the same radial position, the first wave winding coil and the second wave winding coil The conductor sides of the wave winding coil for one turn constituted by the combination are arranged at the same radial position in each slot of the armature core. Therefore, it is easy to make the number of the conductor side portions arranged in the radial direction in the slot an odd number, and the degree of design flexibility that can arbitrarily set the number of turns of the coil (number of turns) according to the required characteristics of the rotating electrical machine. High armature for rotating electrical machines. Furthermore, according to this characteristic configuration, the joining transition part of the first wave winding coil is arranged so as to overlap the other side in the axial direction with respect to the continuous transition part of the second wave winding coil. The portion is arranged so as to overlap one side in the axial direction with respect to the continuous crossing portion of the first wave winding coil. Therefore, since the joining transition part is located on the opposite side to the armature core with respect to the continuous joining part, joining of the joining extension parts can be easily performed. In addition, since the crossover portions of the first wave winding coil and the second wave winding coil do not cross each other and are arranged in the axial direction, it is possible to reduce the size of the coil end portion constituted by the crossover portion. It has an easy configuration. As described above, according to the characteristic configuration of the present invention, the coil can be easily wound around the core, the insulation between the conductors can be easily ensured, the degree of design freedom is high, and the size can be easily reduced. An armature for a rotating electric machine can be realized.

  Here, the coil has an m-layer winding structure in which m pieces of the conductor side portions (m: odd number of 3 or more) are arranged in the radial direction in each slot, and the radial positions of the pair of conductor side portions. Are arranged so as to be layers adjacent to each other in each slot, and the continuous crossing portion is the segment conductor disposed on one axial side or the other axial side with respect to the armature core. Using three-segment conductors, a plurality of the third segment conductors are dispersedly arranged in the circumferential direction, and the joint extending portions of the third segment conductors adjacent to each other are sequentially joined together to make a round in the circumferential direction. And a fourth segment conductor having the same configuration as the third segment conductor, and the fourth segment conductor is one slot on one side in the circumferential direction with respect to the third segment conductor. And a plurality of distributed arrangements along the circumferential direction in a positional relationship shifted by a distance, and the joining extension portions of the fourth segment conductors adjacent to each other are sequentially joined to form a wave winding shape that makes a round in the circumferential direction. A wave winding coil, wherein the coil further includes the first wave winding coil and the second wave winding coil arranged in a radially outermost layer in the plurality of slots, and the third layer in the other layers. It is preferable that the wave winding coil and the fourth wave winding coil are arranged.

  When the coil includes a plurality of phase coils having different phases, each of the phase coils includes the third wave coil and the fourth wave coil configured as described above. Is preferred.

  According to this configuration, the third and fourth wave coils that need to be wound around the armature core as a set of two armature cores, and the armature in units of one armature core. An odd layer winding structure of three or more layers in which the number of the conductor side portions arranged in the radial direction in the slot is an odd number using the first wave coil and the second wave coil that can be wound around the core An armature for a rotating electrical machine including a (m-layer winding structure) coil can be appropriately configured. By the way, when the armature is provided with a plurality of wave winding coils, such as a rotating electric machine driven by three-phase alternating current, the first wave winding coil and the second wave winding coil are different from each other. Since the crossing portion is arranged so as to overlap in the radial direction, it tends to be larger in the radial direction than the height of the conductor side portion arranged in the slot of the first wave winding coil and the second wave winding coil. However, according to this configuration, since the first wave coil and the second wave coil are arranged in the radially outermost layer in the slot, the wave coils in other layers are not affected. And the transition part of the said 1st wave winding coil and the 2nd wave winding coil can be arrange | positioned appropriately.

  Further, the coil has an m-layer winding structure in which m pieces of the conductor side portions are arranged in the radial direction (m: an odd number of 3 or more) in each slot, and the radial positions of the pair of conductor side portions are The third segment conductors are arranged in layers adjacent to each other in each slot, and the continuous crossing portion is the segment conductor arranged on one axial side or the other axial side with respect to the armature core. Using a segment conductor, a plurality of the third segment conductors are dispersedly arranged along the circumferential direction, and the joint extension portions of the third segment conductors adjacent to each other are sequentially joined together to make a round in the circumferential direction. And a fourth segment conductor having the same configuration as the third segment conductor, and the fourth segment conductor is one slot on one side in the circumferential direction with respect to the third segment conductor. A plurality of fourth waves arranged in a distributed manner along the circumferential direction in a shifted positional relationship, and in the form of a wave winding that makes a round in the circumferential direction by sequentially joining the joint extension portions of the fourth segment conductors adjacent to each other. The coil further includes a coil, and a power-side terminal for connection to a power source is provided at one end of the first wave coil and the second wave coil, and the third wave It is preferable that one end of either the wound coil or the fourth wave wound coil is connected to a neutral point that is a connection point with the coil of the other phase.

  According to this configuration, the third wave coil and the fourth wave coil that need to be wound around the armature core as a set of two armature cores, and the armature core as a unit. An odd number of layers of three or more layers in which the number of conductor side portions arranged in the radial direction in the slot is an odd number using the first wave coil and the second wave coil that can be wound around the armature core. An armature for a rotating electrical machine including a coil having a winding structure (m-layer winding structure) can be appropriately configured. Also, at this time, since the power supply side terminal is provided at one end of either the first wave winding coil or the second wave winding coil, the first power winding coil has a relatively large potential difference between conductors in the entire coil. Compared to the three-wave coil and the fourth wave coil, the distance between adjacent joints can be secured, and the first wave-coil and the second wave-coil, which have high electrical insulation, are connected, and between the conductors The third wave coil and the fourth wave coil can be connected to the neutral point side where the potential difference is relatively small. Therefore, the reliability regarding the electrical insulation in the whole coil can be improved.

  In addition, for the first wave coil or the second wave coil, a linear joint extension in which one of the pair of joint extension parts extends in the same straight line as the conductor side part when viewed from one side in the radial direction. The segment conductor, which is a bent joint extending portion that is bent so that the other of the pair of the joint extending portions extends in the circumferential direction to the opposite side of the linear joint extending portion. Using a certain one-side bent segment conductor, the linear joint extension portion of one of the one-side bent segment conductors and the bent junction extension portion of another adjacent one-side bent segment conductor are joined to each other, and It is preferable to adopt a configuration in which a junction crossing portion is formed.

  According to this configuration, only one of the pair of joint extension portions of each segment conductor can be bent to form a bent joint portion, so that it can be joined to an adjacent segment conductor to form a joint transition portion. . Accordingly, it is possible to simplify the machining process for joining a plurality of segment conductors distributed in the circumferential direction, and to reduce the machining process for winding the coil around the armature core.

  Further, in the above characteristic configuration, the coil has an n-layer winding structure in which n pieces of the conductor side portions (n: an integer of 2 or more) are arranged in the radial direction in each slot. For the single wave coil or the second wave coil of n layers, the segment conductors having a common shape are used for each layer, and at least one of the segment conductors has one of the pair of joint extension portions on one side in the radial direction. And the other side of the pair of joint extension portions extends in the circumferential direction opposite to the linear joint extension portion. A bending-joint extension that is bent so as to be present, and at least one other layer of the segment conductor is paired with each other in the circumferential direction. Extending to the opposite side of the joint extension Be configured as a bilateral curved segment conductors with bent flexion joint extending portion is suitable.

  According to this configuration, the first wave winding coil and the second wave winding coil that can be wound around the armature core in units of one armature core are arranged in the slot in the radial direction. An armature for a rotating electrical machine including an n-layer coil having an arbitrary number of conductor side portions can be appropriately configured. At this time, since the one-side bent segment conductor and the both-side bent segment conductors are used separately for each layer, when arranging the first wave coil or the second wave coil in a plurality of layers, each wave coil It becomes easy for the joints between the joint extensions to be at different positions in the circumferential direction between the layers. Therefore, it is possible to disperse joint portions between the joint extension portions of each wave-wound coil in the circumferential direction of the armature core, thereby improving the electrical insulation of the coils.

  Here, the coil is a three-phase first-phase, second-phase, and third-phase wave-coil coil set including the first wave-coil having n layers and the second wave-coil having n layers. The armature core includes two adjacent slots for the first phase, two adjacent slots for the second phase, and two adjacent slots for the third phase. The two slots are arranged so as to repeatedly appear in the order of description in the circumferential direction, and a set of n pieces of junction crossing portions formed at the same circumferential position in the wave winding coil set of each phase. For each of the above, n joint portions of the joint extension portions constituting the joint transition portion set are dispersedly arranged within a half range of the circumferential range where the joint transition portion set is located. A configuration is preferable.

  In this way, in the configuration including the three-phase wave winding coil sets, the joining bridge portions of the two adjacent phase winding coil sets are each half of the circumferential range of the joining bridging portion of the armature core. They are displaced in the circumferential direction. According to this configuration, n joint portions of the joint extension portions constituting the joint transition portion set are dispersedly arranged within a half range of the circumferential range where the joint transition portion set is located. Therefore, n joint portions of the in-phase wave winding coil set can be dispersedly arranged in the circumferential direction, and joint portions of different phases can be dispersedly arranged in the circumferential direction while being shifted from each other by half of the circumferential range. . Therefore, it is possible to disperse the joint portions of the joint extension portions in the wave-winding coil set of each phase in the circumferential direction of the armature core, thereby enhancing the electrical insulation of the coil.

It is sectional drawing cut | disconnected along the radial direction of the stator which concerns on embodiment of this invention. It is the partial sectional view cut along the axial direction of the stator concerning the embodiment of the present invention. It is an expanded view which shows the arrangement | positioning state of the 1st layer coil which concerns on embodiment of this invention. It is an expanded view which shows the state before formation of the 1st layer coil which concerns on embodiment of this invention. It is an expanded view which shows the arrangement state of the 2nd layer coil and 3rd layer coil which concern on embodiment of this invention. It is an expanded view which shows the arrangement state of the 2nd layer coil and 3rd layer coil which concern on embodiment of this invention. It is a schematic diagram which shows the arrangement | positioning state of the junction part formed in the axial direction one side which concerns on embodiment of this invention. It is a schematic diagram which shows the arrangement | positioning state of the junction part formed in the axial direction other side which concerns on embodiment of this invention. It is the partial cross section cut along the axial direction of the stator concerning another embodiment of the present invention. It is a schematic diagram which shows the arrangement | positioning state of the joining transition part in the stator which concerns on another embodiment of this invention. It is a schematic diagram which shows the arrangement | positioning state of the 4th layer coil which concerns on another embodiment of this invention. It is a schematic diagram which shows the arrangement | positioning state of the junction part formed in the axial direction one side which concerns on another embodiment of this invention. It is a schematic diagram which shows the arrangement | positioning state of the junction part formed in the axial direction one side which concerns on another embodiment of this invention.

1. First Embodiment A first embodiment of an armature for a rotating electrical machine according to the present invention will be described with reference to the drawings. Here, a case where the present invention is applied to a stator of an inner rotor type rotating electrical machine will be described as an example. In the stator 1 according to this embodiment, a first wave coil 61 and a second wave coil 62 as shown in FIG. 3 are arranged in the outermost layer (first layer) in the radial direction R in the slot 3. Characterized by points. Thereby, it is possible to appropriately configure a coil having a three-layer winding structure. Hereinafter, the configuration of the stator 1 according to the present embodiment will be described in detail.

In the following description, unless otherwise specified, the “axial direction L”, “circumferential direction C”, and “radial direction R” are defined with reference to the axial center of a cylindrical core reference plane described later. In the following description, “one axial direction L1” represents the upper side along the axial direction L in FIG. 2, and “other axial direction L2” represents the lower side along the axial direction L in FIG. It shall represent. In the following description, “circumferential one side C1” represents the clockwise direction side in FIG. 1, and “circumferential other side C2” represents the counterclockwise direction side in FIG. In the following description, each direction of the coil 20 and the segment conductor 40 constituting the coil 20 is defined as a direction in a state where the coil 20 and the segment conductor 40 are attached to the stator core 2.
In the present embodiment, the stator 1 and the stator core 2 correspond to the “armature for rotating electrical machine” and the “armature core” in the present invention, respectively.

1-1. Overall Configuration of Stator The overall configuration of the stator 1 according to this embodiment will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the stator 1 includes a stator core 2 and a coil 20 and is configured as an armature for a rotating electrical machine. The stator core 2 is formed using a magnetic material, and a plurality of slots 3 extending in the circumferential direction C of the core reference surface are provided in order to enable the coil 20 to be wound. The stator cores 2 are formed in a distributed manner (48 in the example). Here, the “cylindrical core reference plane” is a virtual plane that serves as a reference for the arrangement and configuration of the slots 3. In this embodiment, as shown in FIG. 1, the core inner peripheral surface which is a virtual cylindrical surface including the end surface of the radially inner side R1 of the teeth 5 positioned between the slots 3 adjacent to each other in the circumferential direction C is formed. The cylindrical core inner peripheral surface can be defined as a “cylindrical core reference surface” in the present invention. Moreover, it is concentric with the cylindrical inner peripheral surface, and the cross-sectional shape in the axial direction L (when viewed along the axial direction L) is similar to the cross-sectional shape in the axial direction L of the core inner peripheral surface. Cylindrical surfaces (including virtual surfaces) in relation can also be “cylindrical core reference surfaces” in the present invention. For example, in this embodiment, since the stator core 2 is formed in a cylindrical shape, the outer peripheral surface of the stator core 2 can be a “cylindrical core reference surface”.

  The stator core 2 has a plurality of slots 3 distributed in the circumferential direction C on the inner circumferential surface of the cylindrical core. The plurality of slots 3 are arranged at predetermined circumferential intervals, and are provided so as to extend in the axial direction L as shown in FIG. The slots 3 are formed to have the same cross-sectional shape (rectangular shape in this example) in a plane orthogonal to the axial direction L. As described below, the stator core 2 is formed with slots 3 corresponding to three phases (U phase, V phase, W phase). FIG. 2 shows different phases on the right side and the left side in the figure. FIG. 4 is a cross-sectional view of the stator 1 cut so that a slot 3 appears. Therefore, the right slot 3 and the left slot 3 in FIG. 2 differ from the slot 3 in the shape of the coil 20 on the one axial side L1.

  In the present embodiment, the stator 1 is a stator used in a rotating electrical machine driven by three-phase alternating current (U phase, V phase, W phase). Therefore, the U-phase, V-phase, and W-phase slots 3 are arranged in the stator core 2 so as to repeatedly appear along the circumferential direction C. In this example, the stator core 2 has two slots 3 adjacent to each other for the U phase and two slots 3 adjacent to each other for the V phase so that the number of slots per pole per phase is “2”. And two adjacent slots 3 for the W phase are formed so as to repeatedly appear along the circumferential direction C in the order of description. The coil 20 is also formed in a three-phase configuration (U phase, V phase, W phase) in accordance with the number of phases (three in this example) of the slot 3 formed in the stator core 2. That is, the coil 20 includes a U-phase coil 20u that is a phase coil of each phase, a V-phase coil 20v, and a W-phase coil 20w. As will be described in detail later, the coil 20 is wound around the stator core 2 by wave winding. Since the coils of each phase (the U-phase coil 20u, the V-phase coil 20v, and the W-phase coil 20w) included in the coil 20 have the same configuration, in the following description, unless necessary, for each phase. The description will be made without distinguishing the coils.

  And although illustration is abbreviate | omitted, in the radial direction inner side R1 of the stator 1 (stator core 2), the rotor as a field magnet provided with the permanent magnet or the electromagnet is arrange | positioned so that relative rotation with respect to the stator 1 is possible. Then, the rotor is rotated by the rotating magnetic field generated from the stator 1. That is, the stator 1 according to the present embodiment is an inner rotor type rotating field type stator for a rotating electrical machine.

  Note that the stator core 2 as described above is, for example, a laminated structure in which a plurality of annular plate-shaped electromagnetic steel plates are laminated, or a powder material formed by pressure-forming a magnetic material that is a magnetic material powder. It can be formed as a main component. In the present embodiment, the stator 1 is configured as a stator used in a rotating electrical machine driven by a three-phase alternating current. However, the number of phases of the AC power source that drives the rotating electrical machine can be changed as appropriate. 1 "," 2 "," 4 ", etc. Of course, the number of phase coils included in the coil 20 is appropriately changed according to the number of phases of the AC power supply.

1-2. Next, the configuration of the coil 20 according to the present embodiment will be described in detail. In this embodiment, as shown in FIGS. 1 and 2, the coil 20 has a three-layer winding structure in which three conductor side portions 50 (details will be described later) are arranged in the radial direction R in each slot 3. ing. That is, in each slot 3, the three conductor side portions 50 are arranged in a line so as to overlap (stack) in the radial direction R. In this specification, the position of the conductor side portion 50 in each slot 3 will be described with layer numbers in order from the radially outer side R2 toward the radially inner side R1. Therefore, in the present embodiment, the radially outermost layer is the first layer, and the radially innermost layer is the third layer. Moreover, in the following description, the coil which the conductor side part 50 arrange | positioned at the 1st layer comprises is called the 1st layer coil 21, and the coil which the conductor side part 50 arrange | positioned at the 2nd layer comprises is the 2nd layer. The coil 22 is referred to as a coil formed by the conductor side portion 50 arranged in the third layer, and is referred to as a third layer coil 23. In this example, although the details will be described later, the second layer coil 22 and the third layer coil 23 are integrally formed.

  The coil 20 is configured using a plurality of segment conductors 40 (41 to 44). As shown in FIGS. 3 to 5 to be described later, the segment conductor 40 includes a pair of conductor side portions 50 arranged along the axial direction L in a pair of slots 3 having different circumferential positions C, and the stator core 2. A continuous bridge portion 52 that connects one ends of the pair of conductor side portions 50 on the outside in the axial direction L, and a pair of joint extensions that extend from the other ends of the pair of conductor side portions 50 to the outside in the axial direction L of the stator core 2. And a projecting portion 51. Note that the joint extension 51 extends in the same straight line as the conductor side part 50 that is the extension source when viewed from one side in the radial direction R (one of the radial inner side R1 and the radial outer side R2). The bent joint extension portion 51b bent at the circumferential bending portion 70 so as to extend on the opposite side of the existing linear extension portion 51a and the joint extension portion 51 paired with each other in the circumferential direction C. In the following, when it is not necessary to particularly distinguish these, or when it is clear which of the joint extension portions, it is simply referred to as a joint extension portion 51.

  As shown in FIG. 1, the segment conductor 40 is configured by a linear conductor whose cross-sectional shape in a plane orthogonal to the extending direction (equal to the energizing direction) is rectangular. The material constituting this linear conductor can be, for example, copper or aluminum. Further, the surface of the linear conductor is covered with an insulating film made of a resin or the like (for example, polyimide or the like) except for an electrical connection location between different members (a location where a joint portion 30 described later is formed). In this example, as shown in FIG. 1, the conductor side portion 50 is arranged in the slot 3 so that the longitudinal direction of the cross section of the linear conductor is along the radial direction R.

  The coil 20 includes a first wave coil 61 (see FIG. 3), a second wave coil 62 (see FIG. 3), and a third wave coil formed by joining the segment conductors 40 in a wave shape. 63 (see FIG. 6) and a fourth wave-wound coil 64 (see FIG. 6) are provided for each of the three phases. In other words, each of the plurality of different phase coils (in this example, the U-phase coil 20u, the V-phase coil 20v, and the W-phase coil 20w) included in the coil 20 includes the first wave winding coil 61 and the second wave coil. A winding coil 62, a third wave winding coil 63, and a fourth wave winding coil 64 are provided. The joining of the segment conductors 40 is performed by, for example, arc welding such as TIG welding, electron beam welding, laser beam welding, resistance welding, brazing, soldering, or the like. And the 1st wave winding coil 61, the 2nd wave winding coil 62, the 3rd wave winding coil 63, and the 4th wave winding coil 64 which comprise the same phase are mutually connected in series or in parallel. In the present embodiment, the first wave coil 61 and the second wave coil 62 are arranged in the first layer, which is the outermost layer in the radial direction R in the plurality of slots 3, and the other layers are the other layers. A third wave coil 63 and a fourth wave coil 64 are disposed in the second layer and the third layer. That is, the first layer coil 21 includes a first wave coil 61 and a second wave coil 62, and the second layer coil 22 and the third layer coil 23 include a third wave coil 63 and a second wave coil 63. A fourth wave coil 64 is provided. Hereinafter, the configuration of the first layer coil 21, the second layer coil 22, and the third layer coil 23 will be described in detail.

1-2-1. First Layer Coil The configuration of the first layer coil 21 will be described in detail with reference to FIG. FIG. 3 is a development view showing an arrangement state of the first layer coil 21 corresponding to one phase. In the present embodiment, as described above, the first layer coil 21 includes the first wave winding coil 61 and the second wave winding coil 62.

  The first wave-wound coil 61 is a coil disposed in the first layer, and is a first segment conductor in which the continuous crossing portion 52 is disposed on one side L1 in the axial direction with respect to the stator core 2 as shown in FIG. A one-segment conductor 41 is used. The first segment conductor 41 is a segment conductor in a posture in which the continuous crossing portion 52 is positioned on the one axial side L1 with respect to the stator core 2. Note that the continuous crossing portion 52 of the first segment conductor 41 has a portion extending in parallel to the axial end surface of the stator core 2. The first segment conductors 41 are arranged such that the radial direction R positions of the pair of conductor side portions 50 are in the same layer in each slot 3. In this example, the pair of conductor side portions 50 included in the first segment conductor 41 are both arranged in the first layer. The first wave winding coil 61 disperses a plurality of (four in this example) first segment conductors 41 along the circumferential direction C and, as shown in FIG. 3, the first segment conductors 41 adjacent to each other. These are the coiled coils that are sequentially joined together in the circumferential direction C by joining the joint extension portions 51 together. That is, the first wave coil 61 is a one-turn (one round) wave coil. In addition, since the joining extension part 51 of the 1st segment conductor 41 is located in the axial direction other side L2 with respect to the stator core 2, the front-end | tip parts of the joining extension part 51 in the 1st wave winding coil 61 are joined. The joint portion 30 is disposed outside the stator core 2 in the axial direction L on the other axial side L2. Then, the joining extension part 51 of the first wave winding coil 61 is formed on the other axial side L2 with respect to the stator core 2 by the two joining extension parts 51 connected by the joining part 30.

  The four first segment conductors 41 constituting the first wave-wound coil 61 are arranged at intervals in the circumferential direction C corresponding to two magnetic pole pitches, and a part of them is shown in FIG. The two magnetic pole pitch is a distance twice the magnetic pole pitch which is a distance corresponding to π in electrical angle. In addition, in a portion not shown in FIG. 3, a junction with another wave winding coil, a junction for forming a neutral point, a connection with a terminal for connection to a power source, or the like is formed. Although the segment conductor 40 is disposed, the configuration is basically the same as the portion shown in FIG. The same applies to the second wave winding coil 62, the third wave winding coil 63, and the fourth wave winding coil 64 described below.

  By the way, in this embodiment, as for the 1st segment conductor 41, one side of a pair of joining extension part 51 is made into the linear joining extension part 51a, and the other of a pair of joining extension part 51 is a bending joining extension part 51b. Segment conductors (hereinafter simply referred to as “one-side bent segment conductors 40a”). The one-side bent segment conductor 40a is such that one of the pair of joint extension portions 51 is a linear joint extension portion 51a, and therefore, the other one of the pair of joint extension portions 51 is a bent joint extension portion 51b. It is bent by the circumferential bending portion 70 so as to extend to the opposite side in the circumferential direction C. Thus, in this embodiment, the 1st wave winding coil 61 is comprised using the one side bending segment conductor 40a. In addition, the linear joint extension part 51a with which the 1st segment conductor 41 is provided extends in the same straight line as the conductor side part 50 of the extension origin seeing from the radial direction R one side, but bends in the radial direction R. It is good also as a structure in which the bending part is formed. Further, the bent joint extending portion 51 b provided in the first segment conductor 41 has a portion extending in parallel to the axial end surface of the stator core 2, and the length of the extending portion is determined by the arrangement of the slot 3. It is about 7 times the pitch. In addition, it is good also as a structure by which the bending part bent in the radial direction R is formed in the bending junction extension part 51b with which the 1st segment conductor 41 is provided.

  A plurality of first segment conductors 41 are distributed along the circumferential direction C so that the bent joint extension 51b is located on one circumferential side C1 and the linear joint extension 51a is located on the other circumferential side C2. Has been placed. And the front-end | tip part of the joint extension part 51 (bending joint extension part 51b) of the circumferential direction one side C1 of the 1st segment conductor 41 located in the circumferential direction other side C2, and the 1st located in the circumferential direction one side C1 By joining the distal end portion of the joint extension portion 51 (linear joint extension portion 51 a) on the other circumferential side C <b> 2 of the segment conductor 41, a joint transition portion 53 is formed. In other words, with respect to the one-side bent segment conductor 40a constituting the first wave-wound coil 61, the linear joint extension portion 51a of one one-side bent segment conductor 40a and the bending of another adjacent one-side bent segment conductor 40a. The joining extension part 51b is joined and the joining transition part 53 is formed. Then, as shown in FIG. 3, the joining transition portion 53 is disposed so as to overlap (stack) the other side L <b> 2 in the axial direction with respect to the continuous transition portion 52 of the second wave winding coil 62. The joint 30 for forming the first wave-wound coil 61 is formed at the same circumferential position C as the linear joint extension 51a included in the first segment conductor 41 and corresponds to a two-pole pitch. A plurality are formed for each circumferential C interval.

  The second wave-wound coil 62 is a coil arranged in the first layer, like the first wave-wound coil 61, and the continuous crossing portion 52 is axially on the other side L2 with respect to the stator core 2 as shown in FIG. The second segment conductor 42, which is a segment conductor arranged in the above, is used. The second segment conductor 42 is a segment conductor in a posture in which the continuous crossing portion 52 is positioned on the other axial side L <b> 2 with respect to the stator core 2. The continuous crossing portion 52 of the second segment conductor 42 has a portion extending in parallel to the axial end surface of the stator core 2. The second segment conductors 42 are arranged such that the radial direction R positions of the pair of conductor side portions 50 are in the same layer in each slot 3. In this example, the pair of conductor side portions 50 included in the second segment conductor 42 are both disposed in the first layer. Therefore, all the conductor side parts 50 of the segment conductor 40 which comprise the 1st wave winding coil 61 and the 2nd wave winding coil 62 are arrange | positioned in the mutually same radial direction R position (namely, the same layer).

  The second wave winding coil 62 disperses a plurality of (four in this example) second segment conductors 42 along the circumferential direction C and, as shown in FIG. 3, the second segment conductors 42 adjacent to each other. These are the coiled coils that are sequentially joined together in the circumferential direction C by joining the joint extension portions 51 together. That is, the second wave winding coil 62 is a one-turn (one round) wave winding coil. In addition, since the joining extension part 51 of the 2nd segment conductor 42 is located in the axial direction one side L1 with respect to the stator core 2, the front-end | tip parts of the joining extension part 51 in the 2nd wave winding coil 62 are joined. The joint portion 30 is disposed outside the stator core 2 in the axial direction L on the one axial side L1. Then, the joining extension part 51 of the second wave-wound coil 62 is formed on the one axial side L1 with respect to the stator core 2 by the two joining extension parts 51 connected by the joining part 30. The four second segment conductors 42 constituting the second wave-wound coil 62 are arranged at intervals in the circumferential direction C corresponding to the two magnetic pole pitches, and some of them are shown in FIG. .

  Furthermore, in the present embodiment, the second segment conductor 42 is also a one-side bent segment conductor 40a, like the first segment conductor 41. That is, the second wave winding coil 62 is also configured using the one-side bent segment conductor 40 a, similarly to the first wave winding coil 61. The linear joint extension 51a included in the second segment conductor 42 extends in the same straight line as the original conductor side part 50 when viewed from one side in the radial direction R, but bends in the radial direction R. It is good also as a structure in which the bending part is formed. Further, the bent joint extending portion 51b included in the second segment conductor 42 has a portion extending in parallel to the axial end surface of the stator core 2, and the length of the extending portion is determined by the arrangement of the slot 3. It is about 7 times the pitch. In addition, it is good also as a structure by which the bending part bent in the radial direction R is formed in the bending junction extension part 51b with which the 2nd segment conductor 42 is provided.

  A plurality of second segment conductors 42 are distributed along the circumferential direction C such that the bent joint extension 51b is located on one circumferential side C1 and the linear joint extension 51a is located on the other circumferential side C2. Has been placed. And the front-end | tip part of the joint extension part 51 (bending joint extension part 51b) of the circumferential direction one side C1 of the 2nd segment conductor 42 located in the circumferential direction other side C2, and the 2nd located in the circumferential direction one side C1 By joining the distal end portion of the joint extension portion 51 (linear joint extension portion 51 a) on the other circumferential side C <b> 2 of the segment conductor 42, a joint transition portion 53 is formed. In other words, with respect to the one-side bent segment conductor 40a constituting the second wave-wound coil 62, the linear joint extension portion 51a of one one-side bent segment conductor 40a and the bending of another adjacent one-side bent segment conductor 40a. The joining extension part 51b is joined and the joining transition part 53 is formed. Then, as shown in FIG. 3, the joining transition part 53 is disposed so as to overlap (stack) on the one side L <b> 1 in the axial direction with respect to the continuous transition part 52 of the first wave winding coil 61. The joint 30 for forming the second wave-wound coil 62 is formed at the same circumferential direction C position as the linear joint extension 51a included in the second segment conductor 42 and corresponds to a two-pole pitch. A plurality are formed for each circumferential C interval.

  By the way, as described above, the stator core 2 includes two adjacent slots 3 for the U phase, two adjacent slots 3 for the V phase, and two adjacent slots 3 for the W phase. Are repeatedly formed in the order of description along the circumferential direction C. In the present embodiment, as shown in FIG. 3, the pair of conductor side portions 50 included in the first segment conductor 41 are separated from each other in the circumferential direction C by a distance corresponding to five times the arrangement pitch of the slots 3. A pair of slots 3 are arranged respectively. Further, the pair of conductor side portions 50 included in the second segment conductor 42 are also respectively disposed in the pair of slots 3 that are separated from each other in the circumferential direction C by a distance corresponding to five times the arrangement pitch of the slots 3.

  As shown in FIG. 3, the first segment conductor 41 and the second segment conductor 42 are arranged so that the continuous crossing portions 52 do not overlap each other in the circumferential direction C. In the present application, regarding the arrangement of two members, “overlapping” in a certain direction means that each of the two members has at least a portion at the same position with respect to the arrangement in the direction. Specifically, the other side in the circumferential direction of the conductor segment 50 on the one side C1 in the circumferential direction of the first segment conductor 41 and the second segment conductor 42 disposed adjacent to the one side C1 in the circumferential direction with respect to the first segment conductor 41. The first segment conductor 41 and the second segment conductor 42 are arranged so that the conductor side portion 50 on the side C2 is arranged in the slot 3 adjacent to each other. More specifically, the first segment conductor 41 is placed in the slot 3 adjacent to the circumferential one side C1 with respect to the slot 3 in which the circumferential side one C1 of the first segment conductor 41 is disposed. On the other hand, the conductor side portion 50 on the other circumferential side C2 of the second segment conductor 42 disposed adjacent to the circumferential one side C1 is disposed.

  By arranging the first segment conductor 41 and the second segment conductor 42 as described above, the joining extension portions 51 of the first segment conductors 41 adjacent to each other are joined to each other so that the other axial side L2 of the stator core 2 can be obtained. As shown in FIG. 3, the joining transition part 53 of the first wave winding coil 61 formed on the second wave winding coil 62 is overlapped (stacked) on the other side L <b> 2 in the axial direction. It has an easy configuration. Similarly, the joining extension 53 of the second wave-wound coil 62 formed on the one axial side L1 of the stator core 2 is joined by joining the joining extension parts 51 of the second segment conductors 42 adjacent to each other. It is also easy to stack (stack) on the one side L <b> 1 in the axial direction with respect to the continuous transition portion 52 of the wave winding coil 61. And about the 1st wave winding coil 61 and the 2nd wave winding coil 62, since the joining transition part 53 is located in the opposite side to the stator core 2 with respect to the continuous transition part 52, joining of the joining extension parts 51 is carried out. Can be easily performed. Furthermore, since the transition parts 52 and 53 of the 1st wave winding coil 61 and the 2nd wave winding coil 62 are arrange | positioned so that it may overlap (stack) in the axial direction L without crossing, the said transition parts 52 and 53 concerned. It is also easy to reduce the size of the coil end portion constituted by

  Further, only one of the pair of joint extension portions 51 of the first segment conductor 41 and the second segment conductor 42 is used as the bent joint extension portion 51b, and the joint segment is joined to the adjacent segment conductor 40. 53 can be formed. Therefore, it is possible to simplify the machining process for joining the plurality of segment conductors 40 distributed in the circumferential direction C, and to reduce the machining process for winding the coil 20 around the stator core 2. It has become.

  Further, the bending direction in the circumferential direction C of the circumferential bending portion 70 formed in the first segment conductor 41 is the same as the bending direction in the circumferential direction C of the circumferential bending portion 70 formed in the second segment conductor 42. From this point, the machining process can be simplified. This point will be described with reference to FIG.

  FIG. 4 is a schematic diagram showing a state before the bending process (twist molding) of the joint extension 51 of the first segment conductor 41 and the second segment conductor 42. That is, FIG. 4 schematically shows a state in a stage prior to FIG. 3 in the manufacturing process of the stator 1 according to the present embodiment. The segment conductor 40 is mounted along the axial direction L from the outside in the axial direction L with respect to the slot 3 of the stator core 2 in a form in which, for example, the continuous crossing portion 52 is located on the rear side in the insertion direction, or the stator core The two slots 3 are mounted along the radial direction R from the radial inner side R1. 4 and FIG. 3, the bending direction in the circumferential direction C of the circumferential bending portion 70 formed in the first segment conductor 41 and the circumferential direction formed in the second segment conductor 42 are clear. The bending direction in the circumferential direction C of the bent portion 70 is both the circumferential direction one side C1. Therefore, it is easy to simultaneously perform the bending process of the bending joint extending part 51b of the first segment conductor 41 and the bending process of the bending joint extending part 51b of the second segment conductor 42. Therefore, the machining process can be simplified.

  Incidentally, FIG. 3 shows the first layer coil 21 corresponding to one of the three phases. And although illustration is abbreviate | omitted, the 1st wave winding coil arrange | positioned by the positional relationship which shifted the set of the 1st wave winding coil 61 and the 2nd wave winding coil 62 shown in FIG. A set of 61 and the second wave-wound coil 62 constitutes the first layer coil 21 corresponding to another phase. Further, the first wave winding coil 61 and the second wave winding arranged in a positional relationship in which the set of the first wave winding coil 61 and the second wave winding coil 62 shown in FIG. The set of the coils 62 constitutes the first layer coil 21 corresponding to another phase. Therefore, the joint 30 for forming the first wave-wound coil 61 has a distance corresponding to four times the arrangement pitch of the slots 3 along the circumferential direction C on the other axial side L2 with respect to the stator core 2. In addition, the joint portions 30 of the respective phases are arranged so as to appear in order. Similarly, the joint 30 for forming the second wave-wound coil 62 is a distance corresponding to four times the arrangement pitch of the slots 3 along the circumferential direction C on the one axial side L1 with respect to the stator core 2. Each is arranged so that the joint 30 of each phase appears in turn.

  Although detailed description is omitted, the transition portions 52 and 53 of each phase are arranged so that the transition portions 52 and 53 of two phases of the three phases have a portion overlapping in the circumferential direction C. Therefore, as shown in FIG. 2, a radial stepped portion 80 is formed in the joint extension 51 depending on the phase, and the radial direction R range occupied by the first layer coil 21 in the coil end portion is the conductor side portion 50. The range is about twice the radial R width of the linear conductor. However, since the first layer coil 21 is the outermost layer in the radial direction R, the second layer coil 22 and the third layer coil 23 are formed by setting the offset direction of the radial step 80 to the radial outer side R2. It is possible to appropriately arrange the transition portions 52 and 53 of the first layer coil 21 without affecting. In addition, although detailed description is abbreviate | omitted, in this example, as shown in FIG. 2, as for a pair of joining extension part 51 used as the object of joining, the joint surfaces which mutually oppose the radial direction R are joined. In FIG. 2, the shapes of the coil end portions of the second layer coil 22 and the third layer coil 23 are omitted for simplification.

1-2-2. Second Layer Coil and Third Layer Coil Next, the configuration of the second layer coil 22 and the third layer coil 23 will be described in detail with reference to FIGS. In the present embodiment, as described above, the second layer coil 22 and the third layer coil 23 include the third wave coil 63 and the fourth wave coil 64 and are integrally configured.

  The third wave-wound coil 63 is a coil disposed over two layers, the second layer and the third layer, and the coil 20 according to the present embodiment is shown in FIGS. 5 (a) and 5 (b). As shown in the figure, two third wave winding coils 63 are provided which are shifted from each other in the circumferential direction C by one magnetic pole pitch (for 6 slots). In the following description, the third wave coil 63 shown in FIG. 5A is referred to as one side third wave coil 63a, and the third wave coil 63 shown in FIG. 5B is referred to as the other side third wave coil 63b. That's it. In addition, when it is not necessary to distinguish between these, it is simply referred to as a third wave coil 63. Moreover, both the one side third wave winding coil 63a and the other side third wave winding coil 63b may be collectively referred to as third wave winding coil sets 63a and 63b.

  As shown in FIGS. 5A and 5C, the one-side third wave coil 63 a is configured such that the radial direction R positions of the pair of conductor side portions 50 are adjacent to each other in each slot 3. The third segment conductor 43, which is a segment conductor that is disposed on either side of the stator core 2 in the axial direction L (in this example, the other side L2 in the axial direction), is used. Configured. The third segment conductor 43 is a segment conductor in a posture in which the continuous crossing portion 52 is positioned on one side of the stator core 2 in the axial direction L (in this example, the other side L2 in the axial direction). The continuous crossing portion 52 of the third segment conductor 43 is formed in a V shape having a portion inclined with respect to the axial end surface of the stator core 2. FIG. 5C is a diagram showing the positional relationship in the radial direction R between the one-side third wave-wound coil 63a and the other-side third wave-wound coil 63b, and the arrangement state of the segment conductors 40 is clarified. Therefore, the aspect ratio of each member and the magnitude relationship between different members are different from those of other drawings.

  Specifically, the one-side third wave winding coil 63a disperses and arranges a plurality of (four in this example) third segment conductors 43 along the circumferential direction C, and joins the third segment conductors 43 adjacent to each other. This is a coil having a wave winding shape in which the extending portions 51 are sequentially joined to make a round in the circumferential direction C. That is, the one-side third wave winding coil 63a is a one-turn (one round) wave winding coil. Since the joint extension 51 of the third segment conductor 43 is located on the one side L1 in the axial direction with respect to the stator core 2, the tips of the joint extension 51 in the one-side third wave coil 63a are joined together. The joint portion 30 is disposed outside the stator core 2 in the axial direction L on the one side L1 in the axial direction. Then, the joining extension portion 53 of the third wave winding coil 63 is formed on the one axial side L1 with respect to the stator core 2 by the two joining extension portions 51 connected by the joining portion 30. The joint 30 for forming the one-side third wave-wound coil 63a is located at the center position in the circumferential direction C where the joint transition portion 53 formed by the joint 30 is located, and has a two-pole pitch. A plurality of corresponding circumferential intervals C are formed.

  The four third segment conductors 43 constituting the one-side third wave winding coil 63a are arranged at intervals of the circumferential direction C corresponding to two magnetic pole pitches, and part of them is shown in FIG. Has been. Further, the pair of conductor side portions 50 included in the third segment conductor 43 are respectively disposed in the pair of slots 3 that are spaced apart from each other in the circumferential direction C by a distance corresponding to six times the arrangement pitch of the slots 3 (one magnetic pole pitch). Has been. Further, the third segment conductor 43 is a segment conductor in which both of the pair of joint extending portions 51 are bent joint extending portions 51b (hereinafter simply referred to as “both side bent segment conductors 40b”). The bent joint extending portion 51b included in the third segment conductor 43 is formed so as to be inclined with respect to the end surface in the axial direction of the stator core 2, and the length along the circumferential direction C is 3 of the arrangement pitch of the slots 3. It is about double.

  By the way, as described above, the third segment conductor 43 is formed such that the radial position R of the pair of conductor side portions 50 is adjacent to each other in each slot 3. In this example, the pair of conductor side portions 50 included in the third segment conductor 43 is such that the conductor side portion 50 on the one side C1 in the circumferential direction is 1 in the radial inner side R1 with respect to the conductor side portion 50 on the other side C2 in the circumferential direction. The layer is offset by a layer and disposed in a layer adjacent to the radially inner side R1. Specifically, in the pair of conductor side portions 50 provided in the third segment conductor 43, the conductor side portion 50 on the one circumferential side C1 is arranged in the third layer, and the conductor side portion 50 on the other circumferential side C2 is the first side. Arranged in two layers. Therefore, the position of the conductor side portion 50 in each slot 3 of the one-side third wave-wound coil 63 is alternately switched between the second layer and the third layer along the circumferential direction C. In this way, the one-side third wave coil 63a is a one-turn wave coil disposed across the two layers of the second layer and the third layer.

  On the other hand, the other side third wave winding coil 63b basically has the same configuration as the one side third wave winding coil 63a, but the arrangement position in the circumferential direction C of the third segment conductor 43, which is a component, is one side. This is different from the side third wave coil 63a. As is apparent from a comparison between FIG. 5A and FIG. 5B, the third segment conductor 43 constituting the one-side third wave coil 63a and the other-side third wave coil 63b are constituted. In the third segment conductor 43, the conductor side portions 50 are arranged in the same slot 3, but the circumferential positions of the continuous crossing portions 52 are arranged so as to be shifted from each other in the circumferential direction C by one magnetic pole pitch. Therefore, in each slot 3, the other circumferential direction provided in the third segment conductor 43 that constitutes one of the third wave winding coil 63 a and the other side third wave winding coil 63 b. The conductor side 50 on the side C2 is disposed in the second layer, and the conductor side 50 on the circumferential one side C1 provided in the third segment conductor 43 constituting the other third wave-wound coil 63 is on the third layer. Has been placed.

  As shown in FIG. 5 (c), the one side third wave coil 63a and the other side third wave coil 63b on both the one axial side L1 and the other axial side L2 with respect to the stator core 2 are: They are arranged without crossing each other. And by these one side third wave winding coil 63a and the other side third wave winding coil 63b, two turns (for two rounds) arranged across the two layers of the second layer and the third layer. A wave winding coil is formed. The joint 30 for forming the third wave-wound coil sets 63a and 63b is located at the center position in the circumferential range C where the joint transition part 53 formed by the joint 30 is located and corresponds to one magnetic pole pitch. A plurality are formed at intervals in the circumferential direction C (see FIG. 6).

  The fourth wave winding coil 64 has the same configuration as the third wave winding coil 63, but the third wave winding coil 63 is different from the slot 3 in which the conductor side portion 50 is disposed. Specifically, the fourth wave coil 64 is disposed in a positional relationship in which the third wave coil 63 is shifted by one slot on either side in the circumferential direction (in this example, the other circumferential side C2). It is a coil. Similarly to the third wave coil 63, the fourth wave coil 64 is also provided with two that are shifted from each other in the circumferential direction C by one magnetic pole pitch (6 slots), and the one side third wave coil 63a. The coil arranged in a positional relationship shifted by one slot on the other circumferential side C2 is referred to as one side fourth wave coil 64a, and the other third wave coil 63b is shifted by one slot on the other circumferential side C2. The coil arranged in a certain positional relationship is referred to as the other-side fourth wave winding coil 64b. In addition, when it is not necessary to distinguish the one-side fourth wave coil 64a and the other-side fourth wave coil 64b, they are simply referred to as the fourth wave coil 64. Moreover, both the one-side fourth wave winding coil 64a and the other-side fourth wave winding coil 64b may be collectively referred to as fourth wave winding coil sets 64a and 64b.

  As shown in FIG. 6, the one-side fourth wave-wound coil 64 a has a plurality of (four in this example) fourth segment conductors 44 distributed in the circumferential direction C, and the fourth segment conductors 44 adjacent to each other. These are the coiled coils that are sequentially joined together in the circumferential direction C by joining the joint extension portions 51 together. FIG. 6 is a development view showing an arrangement state of the third wave winding coil sets 63a and 63b and the fourth wave winding coil sets 64a and 64b corresponding to one phase. The fourth segment conductor 44 constituting the one-side fourth wave coil 64a has the same configuration as the third segment conductor 43 constituting the one-side third wave coil 63a, but the one-side third wave coil 63a The third segment conductors 43 to be configured are arranged in a positional relationship shifted by one slot on either side in the circumferential direction C (the other side C2 in the circumferential direction in this example). Further, the fourth segment conductor 44 constituting the other-side fourth wave-wound coil 64b has a positional relationship in which the third segment conductor 43 constituting the other-side third wave-wound coil 63b is shifted by one slot to the other circumferential side C2. Is arranged in.

  FIG. 6 shows the second layer coil 22 and the third layer coil 23 corresponding to one of the three phases. And although illustration is omitted, the third wave coil set 63a and 63b and the fourth wave coil set 64a and 64b shown in FIG. The third wave coil set 63a, 63b and the fourth wave coil set 64a, 64b constitute the second layer coil 22 and the third layer coil 23 corresponding to different phases. Further, the third wave winding coil arranged in a positional relationship in which the set of the third wave winding coil sets 63a and 63b and the fourth wave winding coil sets 64a and 64b shown in FIG. A set of the sets 63a and 63b and the fourth wave winding coil sets 64a and 64b constitutes the second layer coil 22 and the third layer coil 23 corresponding to still another phase. Therefore, the joint portion 30 for forming the third wave winding coil sets 63a and 63b corresponds to twice the arrangement pitch of the slots 3 along the circumferential direction C on the one axial side L1 with respect to the stator core 2. It arrange | positions so that the junction part 30 of each phase may appear in order for every distance to perform. Similarly, the joint 30 for forming the fourth wave coil sets 64a and 64b is twice the arrangement pitch of the slots 3 along the circumferential direction C on the one axial side L1 with respect to the stator core 2. It arrange | positions so that the junction part 30 of each phase may appear in order for every corresponding distance.

1-2-3. Next, an arrangement configuration of the joint portion 30 between the joint extension portions 51 in the stator 1 according to the present embodiment will be described. FIG. 7 is a schematic diagram showing an arrangement state of the joint portion 30 formed on the one axial side L1 with respect to the stator core 2, and FIG. 8 shows a joint formed on the other axial side L2 with respect to the stator core 2. FIG. 6 is a schematic diagram illustrating an arrangement state of a unit 30.

  As described above, the joint 30 for forming the first wave-wound coil 61 corresponds to four times the arrangement pitch of the slots 3 along the circumferential direction C on the other axial side L2 with respect to the stator core 2. It arrange | positions so that the junction part 30 of each phase may appear in order for every distance to perform. Further, the joint 30 for forming the second wave-wound coil 62 is provided at every distance corresponding to four times the arrangement pitch of the slots 3 along the circumferential direction C on the one axial side L1 with respect to the stator core 2. In addition, the joint portions 30 of the respective phases are arranged so as to appear in order. Further, the joint 30 for forming the third wave winding coil sets 63a and 63b corresponds to twice the arrangement pitch of the slots 3 along the circumferential direction C on one axial side L1 with respect to the stator core 2. It arrange | positions so that the junction part 30 of each phase may appear in order for every distance to perform. The joint 30 for forming the fourth wave coil sets 64a and 64b is equivalent to twice the arrangement pitch of the slots 3 along the circumferential direction C on one axial side L1 with respect to the stator core 2. It arrange | positions so that the junction part 30 of each phase may appear in order for every distance to perform.

  Therefore, as shown in FIG. 7, a plurality (12 in this example) of joint portions 30 for forming the second wave-wound coil 62 are arranged on one side L <b> 1 in the axial direction with respect to the stator core 2. A plurality of joint portions 30 (24 in this example) for forming the third wave winding coil sets 63a and 63b are arranged, and further, a joint portion for forming the fourth wave winding coil sets 64a and 64b. A plurality (30 in this example) 30 are arranged. Also, as shown in FIG. 8, a plurality (12 in this example) of joint portions 30 for forming the first wave-wound coil 61 are arranged on the other axial side L <b> 2 with respect to the stator core 2. The positional relationship in the circumferential direction C between the joint 30 for forming the first wave-wound coil 61 and the joint 30 for forming the second wave-wound coil 61 is along the circumferential direction C. For each distance corresponding to twice the arrangement pitch of the slots 3, the joint 30 for forming the first wave-wound coil 61 and the joint 30 for forming the second wave-wound coil 62 are alternately arranged. It is a relationship that appears.

  As is clear from FIG. 7, the joint 30 in the second wave coil 62 constituting the first layer coil 21 is composed of the third wave coil 63 and the third wave coil 63 constituting the second layer coil 22 and the third layer coil 23. Compared to the joint 30 in the four-wave coil 64, the distance between the adjacent joints 30 is ensured. Further, as shown in FIG. 8, only the joint 30 in the first wave coil 61 constituting the first layer coil 21 is arranged on the other axial side L2 with respect to the stator core 2. Therefore, the first layer coil 21 constituted by the first wave winding coil 61 and the second wave winding coil 62 has enhanced electrical insulation as compared with coils of other layers. Therefore, although illustration is omitted, at one end of the first wave winding coil 61 and the second wave winding coil 62, a power supply side terminal for connection to a power source is provided, and the third wave winding coil 63 and When one end portion of the fourth wave coil 64 is connected to a neutral point that is a connection point with the coil 20 of the other phase, the reliability regarding the electrical insulation in the entire coil 20 is improved. This is preferable.

2. Second Embodiment Next, a second embodiment of the armature for a rotating electrical machine according to the present invention will be described. Here, the present invention will be described by taking the case where the present invention is applied to a stator of an inner rotor type rotating electrical machine as an example, but the stator 1 according to the present embodiment has a radially outermost layer (in the slot 3) ( It differs greatly from the first embodiment in that the first wave winding coil 61 and the second wave winding coil 62 are arranged not only in the first layer) but also in other layers. Hereinafter, the configuration of the stator 1 according to the present embodiment will be described focusing on differences from the first embodiment. Note that points not particularly described are the same as those in the first embodiment. In the present embodiment, the U phase, the V phase, and the W phase correspond to the “first phase”, “second phase”, and “third phase” in the present invention, respectively.

  In the present embodiment, the coil 20 has an eight-layer winding structure in which eight conductor side portions 50 are arranged in the radial direction R in each slot 3 as shown in FIG. That is, in each slot 3, eight conductor side portions 50 are arranged in a line so as to overlap (stack) in the radial direction R. A first wave coil 61 and a second wave coil 62 as shown in FIG. 3 are arranged in all layers from the first layer to the eighth layer. That is, all the layer coils 21 to 28 from the first layer coil 21 to the eighth layer coil 28 are configured to include the first wave winding coil 61 and the second wave winding coil 62. In addition, although mentioned later for details, the 1st wave winding coil 61 and the 2nd wave winding coil 62 which are arrange | positioned at layers other than a 1st layer and a 5th layer are joining in the circumferential direction C range in which the joining transition part 53 is located. The circumferential direction C position of the part 30 is different from that in FIG. The coil 20 includes a wave winding coil set including an eight-layer first wave winding coil 61 and an eight-layer second wave winding coil 62 for three phases of a U phase, a V phase, and a W phase. . In other words, each of the plurality of different phase coils included in the coil 20 (in this example, the U-phase coil 20u, the V-phase coil 20v, and the W-phase coil 20w) includes the eight-layer first wave winding coil 61 and A wave winding coil set including an eight-layer second wave winding coil 62 is provided.

  FIG. 10 is a schematic diagram showing an arrangement state of the joining and bridging portions 53 formed on the one axial side L <b> 1 with respect to the stator core 2. That is, the joining transition part 53 shown in FIG. 10 is the joining transition part 53 of the 2nd wave winding coil 62 with which the coils 21-28 of each layer are provided. Although not shown in the drawings, the joining / crossing portion 53 of the first wave-wound coil 61 formed on the other axial side L2 with respect to the stator core 2 is also arranged in the same manner. As shown in FIG. 10, the junction crossing portions 53 of each phase are arranged so as to overlap each other in the circumferential direction C. Specifically, the circumferential direction one side C1 portion in the joining transition portion 53 of the U-phase coil 20u and the circumferential direction other side C2 portion in the joining transition portion 53 of the V-phase coil 20v overlap in the circumferential direction C. Has been placed. Moreover, the circumferential direction one side C1 part in the joining transition part 53 of V phase coil 20v and the circumferential direction other side C2 part in the joining transition part 53 of W phase coil 20w are arrange | positioned so that it may overlap with the circumferential direction C. Yes. And the circumferential direction one side C1 part in the joining transition part 53 of the W-phase coil 20w and the circumferential direction other side C2 part in the joining transition part 53 of the U-phase coil 20u are arrange | positioned so that it may overlap with the circumferential direction C. Yes. Although detailed description is omitted, as shown in FIG. 9, a radial stepped portion 80 is formed in at least a part of the joint extending portion 51 in order to realize such an arrangement configuration. In addition, the junction crossing 53 of the V-phase coil 20v has a shape that is offset in the radial direction R in the vicinity of the center position in the circumferential direction C.

  In the present embodiment, the segment conductor 40 having a common shape is used for each layer of the eight-layer first wave coil 61 and the eight-layer second wave coil 62. That is, the first wave coil 61 constituting the same layer is configured using the segment conductor 40 having a common shape, and the second wave coil 62 configuring the same layer is also configured using the segment conductor 40 having a common shape. Has been.

  The “commonly shaped segment conductor 40” means the circumference of the joint portion 30 in the circumferential direction C where the joint bridging portions 53 formed by joining the joint extension portions 51 of the segment conductors 40 adjacent to each other are located. The segment conductors 40 whose direction C positions coincide with each other are meant. That is, in the case where the segment conductor 40 is the one-side bent segment conductor 40a, it means the common segment conductor 40 whether or not the linear joint extension portion 51a is the joint extension portion 51 on the one circumferential side C1. To do. Further, when the segment conductor 40 is a double-side bent segment conductor 40b, the relationship between the length of the joint extension 51 on the one circumferential side C1 and the length of the joint extension 51 on the other circumferential C2 side (ratio) Etc.) means a common segment conductor 40.

  In the present embodiment, even when the first wave coil 61 and the second wave coil 62 constituting the same layer are viewed along the radial direction R, the vertical relationship in the axial direction L is reversed. A segment conductor 40 having a common shape is used. And in this embodiment, the segment conductor 40 of the 1st layer and the 5th layer is made into the one side bending segment conductor 40a which has the linear junction extension part 51a in the circumferential direction other side C2. Specifically, the first segment conductor 41 constituting the first wave winding coil 61 arranged in the first layer, the second segment conductor 42 constituting the second wave winding coil 62 arranged in the first layer, the first The first segment conductor 41 constituting the first wave winding coil 61 arranged in the five layers and the second segment conductor 42 constituting the second wave winding coil 62 arranged in the fifth layer are all in the other circumferential direction. It is set as the one side bending segment conductor 40a which has the linear junction extension part 51a in the side C2. Therefore, the first layer coil 21 and the fifth layer coil 25 have the same configuration as the first layer coil 21 (see FIG. 3) in the first embodiment.

  On the other hand, in the present embodiment, the segment conductors 40 in layers other than the first layer and the fifth layer are both-side bent segment conductors 40b. The second-layer segment conductor 40 and the sixth-layer segment conductor 40 are segment conductors having a common shape. The third-layer segment conductor 40 and the seventh-layer segment conductor 40 are segment conductors having a common shape. The fourth layer segment conductor 40 and the eighth layer segment conductor 40 are formed into a common segment conductor 40.

  Here, the fourth layer coil 24 will be specifically described. FIG. 11 is a development view showing an arrangement state of the fourth layer coil 24 corresponding to one phase. As shown in FIG. 11, the first wave-wound coil 61 included in the fourth layer coil 24 includes a joint extension portion 51 (bending joint extension portion 51b) of both side bending segment conductors 40b (first segment conductors 41) adjacent to each other. ) Are sequentially joined together. And since the pair of junction extension parts 51 (bending junction extension part 51b) with which both the side bending segment conductors 40b are provided are mutually formed in substantially the same length, as shown in FIG. 11, the 4th layer coil 24 is shown. The joint portion 30 in the first wave-wound coil 61 included in is located in the vicinity of the center position in the circumferential direction C range where the joint transition portion 53 formed by the joint portion 30 is located. Similarly, the second wave coil 62 provided in the fourth layer coil 24 is also a double-sided bent segment conductor in which the lengths of the pair of joint extension portions 51 (bending joint extension portions 51b) are formed to be substantially the same. 40b (second segment conductor 42) is used. Therefore, as shown in FIG. 11, the joint portion 30 in the second wave-wound coil 62 provided in the fourth layer coil 24 is the center position in the circumferential direction C range where the joint transition portion 53 formed by the joint portion 30 is located. Located in the vicinity. As described above, since the segment conductor 40 of the fourth layer and the segment conductor 40 of the eighth layer are the segment conductors 40 having a common shape, the eighth layer coil 28 is formed in the same manner as the fourth layer coil 24. Has been.

  Although not described in detail, the junction 30 in the second layer coil 22 and the sixth layer coil 26 and the junction 30 in the third layer coil 23 and the seventh layer coil 27 are the first layer coil 21 and the first layer coil 21. The joint part 30 in the five-layer coil 25 and the joint part 30 in the fourth layer coil 24 and the eighth layer coil 28 are arranged at positions where the circumferential direction C range defining both ends is equally or substantially equally divided into three. In addition, segment conductors 40 of the second layer and the sixth layer, and segment conductors 40 of the third layer and the seventh layer are configured. That is, the length of the pair of joint extension portions 51 included in the second and sixth layer segment conductors 40 and the third and seventh layer segment conductors 40 so that the positional relationship as described above is obtained. The length of the pair of joint extension portions 51 provided is set. Thereby, as described below, the joint portions 30 between the joint extension portions 51 can be dispersedly arranged.

  FIG. 12 is a schematic diagram showing an arrangement state of the joint portion 30 from the first layer coil 21 to the eighth layer coil 28 formed on the one axial side L <b> 1 with respect to the stator core 2. In addition, since the coils 20u, 20v, and 20w of each phase have the same configuration, only the U-phase coil 20u will be described here. As shown in FIG. 12, with respect to the joint portions 30 in the respective layer coils 21 to 28 of the U-phase coil 20u, i is an integer from 1 to 4, and the circumferential direction C position of the joint portion 30 in the i-th layer coil i + 4) The circumferential direction C position of the joint 30 in the layer coil coincides. And FIG. 13 has shown the relationship of the circumferential direction C position in the circumferential direction C range in which the junction part 53 of the junction part 30 of each layer coil 21-28 which comprises the U-phase coil 20u is located. As shown in FIGS. 12 and 13, since the joint portions 30 of the respective layer coils 21 to 28 are distributed in the circumferential direction C, the distance between the joint portions 30 between adjacent layers is appropriately ensured. It is possible to do. The joint 30 in the i-th layer coil and the joint 30 in the (i + 4) -th layer coil are arranged at the same circumferential direction C position, where i is an integer from 1 to 4, but these joints 30 Since they are originally separated in the radial direction R by a distance corresponding to four layers, problems relating to electrical insulation hardly occur. In addition, although illustration is abbreviate | omitted, the junction part 30 is similarly arrange | positioned also in the part which is not shown in FIG.

  As shown in FIGS. 12 and 13, the joint portion 30 of each layer coil 21 to 28 constituting the U-phase coil 20 u is a half range of the circumferential direction C range in which the joining transition portion 53 of the U-phase coil 20 u is located. Distributed within. Note that, as shown in FIG. 10, the joining transition portions 53 of the respective phases are arranged so as to be shifted in the circumferential direction C by half of the circumferential direction C range of the joining transition portions 53. Therefore, as shown in FIG. 12, not only the joint portion 30 of the U-phase coil 20 u but also the joint portion 30 of the V-phase coil 20 v and the W-phase coil 20 w are similarly in the circumferential direction C range where the joining transition portion 53 is located. It is possible to disperse and arrange within a half range. Therefore, it becomes the structure which can disperse | distribute and arrange the junction part 30 of the same phase in the circumferential direction, without overlapping the circumferential direction C range where the junction part 30 of the same phase is arrange | positioned between different phases. As described above, in the present embodiment, each of the sets of the eight joining transition portions 53 formed at the same circumferential direction C position in the wave winding coil set of each phase is a joining constituting the joining joining portion 53 set. Eight joints 30 between the extension parts 51 are dispersedly arranged in a half of the circumferential direction C range in which the set of joint transition parts 53 is located.

  Note that the circumferential direction C range in which the joint portions 30 of the same phase can be dispersedly arranged in the circumferential direction is suitably changed according to the number of phases of the coil 20. That is, when the number of phases of the coil 20 is larger than 3, it is preferable that the plurality of joints 30 are dispersedly arranged in a range smaller than half of the circumferential direction C range of the joint transition portion 53.

  Moreover, although illustration is abbreviate | omitted, the junction part 30 of the 1st wave winding coil 61 arrange | positioned at each layer coil 21-28 formed in the axial direction other side L2 with respect to the stator core 2 is also arrange | positioned similarly to FIG. Has been.

3. Other Embodiments (1) In the first embodiment, the case where both the first wave winding coil 61 and the second wave winding coil 62 are configured using the one-side bent segment conductor 40a will be described as an example. did. However, the embodiment of the present invention is not limited to this. For example, one of the first wave winding coil 61 and the second wave winding coil 62 may be configured using the one-side bent segment conductor 40a, and the other may be configured using the both-side bent segment conductor 40b. Moreover, you may comprise both the 1st wave winding coil 61 and the 2nd wave winding coil 62 using the both-sides bending segment conductor 40b.

(2) In the first embodiment, the coil 20 has a three-layer winding structure, and the first wave-wound coil 61 and the second wave-wound coil 62 are arranged in the first layer that is the radially outermost layer. The case has been described as an example. However, the embodiment of the present invention is not limited to this, and the first wave winding coil 61 and the second wave winding coil 62 may be arranged in a layer other than the first layer. The coil 20 is not limited to a three-layer structure, and the coil 20 has a structure in which conductor side portions 50 are arranged in an odd number of layers larger than three, such as a five-layer structure and a seven-layer structure. May be. In such a case, the position of the layer and the number of layers in which the first wave coil 61 and the second wave coil 62 are arranged can be changed as appropriate. For example, as in the first embodiment, the first wave coil 61 and the second wave coil 62 are disposed only in the radially outermost layer (first layer), and the third wave is disposed in the other layers. The winding coil 63 and the fourth wave winding coil 64 can be arranged. Further, the coil 20 may have a one-layer winding structure in which the first wave winding coil 61 and the second wave winding coil 62 are arranged in the first layer.

(3) In the second embodiment, the first and fifth layer segment conductors 40 are one-side bent segment conductors 40a, and the segment conductors 40 other than the first and fifth layers are both-side bent segment conductors 40b. The case has been described as an example. However, the embodiment of the present invention is not limited to this, and only the segment conductor 40 of one certain layer (for example, the first layer) can be the one-side bent segment conductor 40a. Of course, the segment conductors 40 of all layers can be the one-side bent segment conductors 40a, and the segment conductors 40 of all the layers can be the both-side bent segment conductors 40b.

(4) In the second embodiment, the vertical relationship in the axial direction L when viewed along the radial direction R even between the first wave winding coil 61 and the second wave winding coil 62 constituting the same layer. Although the above is reversed, the case where the segment conductor 40 having a common shape is used has been described as an example. However, the embodiment of the present invention is not limited to this, and a configuration in which the segment conductor 40 having a common shape is not used between the first wave winding coil 61 and the second wave winding coil 62 constituting the same layer. It can also be. That is, the arrangement configuration of the joint portion 30 formed on the one axial side L1 with respect to the stator core 2 and the arrangement configuration of the joint portion 30 formed on the other axial side L2 with respect to the stator core 2 are independent of each other. Can be designed.

(5) In the second embodiment, the case where the coil 20 has an eight-layer winding structure has been described as an example. However, the embodiment of the present invention is not limited to this, and the number of layers of the coil 20 can be changed as appropriate. For example, the coil 20 can have a 10-layer structure.

(6) In the second embodiment, with respect to the joint portions 30 in the respective layer coils 21 to 28 constituting the coils of the same phase, i is an integer from 1 to 4, and the circumference of the joint portion 30 in the i-th layer coil. The case where the direction C position and the circumferential direction C position of the joint part 30 in the (i + 4) th layer coil coincide with each other has been described as an example. However, the embodiment of the present invention is not limited to this, and the arrangement position of the joint portion 30 in each of the layer coils 21 to 28 can be appropriately changed within a range that is half of the circumferential direction C range of the joint transition portion 53. It is. For example, it can be configured such that none of the joint portions 30 of the respective layer coils 21 to 28 are located at the same circumferential direction C position.

(7) In said 2nd embodiment, about each of the group of the some joining transition part 53 formed in the same circumferential direction C position in the wave coil group of each phase, the group of the said joining transition part 53 is used. The case where the plurality of joining portions 30 of the joining extension portions 51 to be configured are dispersedly arranged in a half of the circumferential direction C range where the set of joining joining portions 53 is located has been described as an example. However, the embodiment of the present invention is not limited to this, and the plurality of joint portions 30 of the joint extension portions 51 constituting the set of the joint transition portions 53 are located in the group of the joint transition portions 53. It is also possible to adopt a configuration in which they are distributed within a quarter of the circumferential direction C range, or a configuration in which they are arranged at the same circumferential direction C position.

(8) In the second embodiment described above, the case where the segment conductor 40 having a common shape is used for each layer of the eight-layer first wave coil 61 or the eight-layer second wave coil 61 has been described as an example. A configuration in which the segment conductor 40 having a common shape is not used for each layer is also possible.

(9) In the above embodiment, the third segment conductor 43 that constitutes the third wave winding coil 63 and the fourth segment conductor 44 that constitutes the fourth wave winding coil 64 include the pair of conductor side portions 50 and the The case where it has the continuous crossing part 52 which connects the ends of a pair of conductor side part 50, and a pair of joining extension part 51 extended from each other end of the said pair of conductor side part 50. Described as an example. However, the embodiment of the present invention is not limited to this, and at least one of the third segment conductor 43 and the fourth segment conductor 44 is disposed along the axial direction L in the slot 3. And a pair of joint extending portions 51 extending in the axial direction L with respect to the stator core 2 from both ends of the conductor side portion 50, that is, a segmented conductor, that is, a continuous crossing portion 52, A configuration in which the segment conductor is not included (for example, an I-shaped segment conductor or an L-shaped segment conductor in which one joint extension 51 is bent in advance) is also preferable. This is one of the embodiments. In the first embodiment, the case where the coils other than the first layer are also wave winding coils has been described as an example. However, the coils other than the first layer are lap winding coils or concentric winding coils. It can also be configured.

(10) In the above embodiment, the case where the cross-sectional shape of the linear conductor constituting the segment conductor 40 in the cross section orthogonal to the extending direction is rectangular has been described as an example. However, the embodiment of the present invention is not limited to this, and linear conductors such as a circular shape, an elliptical shape, a square shape, and a polygonal shape can be used as the cross-sectional shape.

(11) In the above-described embodiment, the case where the armature for a rotating electrical machine according to the present invention is applied to a stator for an inner rotor type rotating electrical machine has been described as an example. It can also be applied.

  The present invention includes an armature core in which a plurality of slots extending in the axial direction of a cylindrical core reference surface are distributed in the circumferential direction of the core reference surface, and a coil wound around the armature core. It can utilize suitably for the armature for rotating electrical machines.

1: Stator (armature for rotating electrical machine)
2: Stator core (armature core)
3: Slot 20: Coil 30: Joint 40: Segment conductor 40a: One side bent segment conductor 40b: Both side bent segment conductor 41: First segment conductor 42: Second segment conductor 43: Third segment conductor 44: Fourth segment Conductor 50: Conductor side 51: Joining extension 51a: Linear joining extension 51b: Bending joining extension 52: Continuous joining part 53: Joining joining part 61: First wave coil 62: Second wave winding Coil 63: Third wave coil 64: Fourth wave coil L: Axial direction C: Circumferential direction R: Radial direction

Claims (6)

A rotating electrical machine comprising: an armature core in which a plurality of slots extending in the axial direction of a cylindrical core reference surface are distributed in the circumferential direction of the core reference surface; and a coil wound around the armature core Armature,
The coil connects a pair of conductor side portions disposed along the axial direction in the pair of slots having different circumferential positions, and one end of the pair of conductor side portions on the outer side in the axial direction of the armature core. A plurality of segment conductors formed of continuous conductors, and a pair of joint extending portions extending from the other ends of the pair of conductor side portions to the outside in the axial direction of the armature core. A plurality of first segment conductors, which are the segment conductors arranged on one side in the axial direction with respect to the armature core, and a plurality of first segment conductors arranged in a circumferential direction, and adjacent to each other A first wave-wound coil in which the joint extension portions of the one-segment conductor are sequentially joined to make a round in the circumferential direction, and the continuous crossing portion is disposed on the other side in the axial direction with respect to the armature core. Said seg A plurality of second segment conductors, which are conductor conductors, are distributed in the circumferential direction, and the joint extension portions of the second segment conductors adjacent to each other are sequentially joined to form a wave winding that makes a round in the circumferential direction. A second wave winding coil,
The slot in which the conductor side portion on one circumferential side of the first segment conductor and the conductor side portion on the other circumferential side of the second segment conductor arranged adjacent to the first segment conductor are adjacent to each other. And the conductor side portions of the segment conductors constituting the first wave coil and the second wave coil are disposed at the same radial position,
The junction crossing part of the first wave winding coil formed on the other side in the axial direction of the armature core by joining the joining extension parts of the first segment conductors adjacent to each other is the second wave winding. It is arranged so as to overlap the other side in the axial direction with respect to the continuous crossing portion of the coil, and by joining the joint extension portions of the second segment conductors adjacent to each other on the one side in the axial direction of the armature core The junction arm of the second wave winding coil formed is an armature for a rotating electrical machine arranged so as to overlap one side in the axial direction with respect to the continuous transition portion of the first wave winding coil. The coil has an m-layer winding structure in which m conductor sides are arranged in the radial direction (m: an odd number of 3 or more) in each slot,
The radial positions of the pair of conductor side portions are arranged so as to be layers adjacent to each other in each slot, and the continuous crossing portion is on one axial side or the other axial side with respect to the armature core. The third segment conductors, which are the segment conductors, are arranged in a distributed manner along the circumferential direction, and the joint extension portions of the third segment conductors adjacent to each other are sequentially arranged. A third wave coil that is joined and wound in a circumferential direction and a fourth segment conductor having the same configuration as the third segment conductor is used, and the fourth segment conductor is connected to the third segment conductor. The plurality of joint extension portions of the fourth segment conductors adjacent to each other are arranged in a distributed manner along the circumferential direction in a positional relationship shifted by one slot on one circumferential side. And a fourth wave winding coils and a wave winding shape a round in the circumferential direction by sequentially joining, further comprising said coil,
The first wave coil and the second wave coil are arranged in the radially outermost layer in the plurality of slots, and the third wave coil and the fourth wave coil are arranged in the other layers. The armature for a rotating electrical machine according to claim 1, wherein the armature is used. The coil has an m-layer winding structure in which m conductor sides are arranged in the radial direction (m: an odd number of 3 or more) in each slot,
The radial positions of the pair of conductor side portions are arranged so as to be layers adjacent to each other in each slot, and the continuous crossing portion is on one axial side or the other axial side with respect to the armature core. The third segment conductors, which are the segment conductors, are arranged in a distributed manner along the circumferential direction, and the joint extension portions of the third segment conductors adjacent to each other are sequentially arranged. A third wave coil that is joined and wound in a circumferential direction and a fourth segment conductor having the same configuration as the third segment conductor is used, and the fourth segment conductor is connected to the third segment conductor. The plurality of joint extension portions of the fourth segment conductors adjacent to each other are arranged in a distributed manner along the circumferential direction in a positional relationship shifted by one slot on one circumferential side. And a fourth wave winding coils and a wave winding shape a round in the circumferential direction by sequentially joining, further comprising said coil,
A power supply side terminal for connection to a power source is provided at one end of the first wave winding coil and the second wave winding coil, and any one of the third wave winding coil and the fourth wave winding coil The armature for a rotating electrical machine according to claim 1 or 2, wherein one of the ends is connected to a neutral point that is a connection point with the coil of the other phase.   For the first wave winding coil or the second wave winding coil, one of the pair of joint extending portions extends in the same straight line as the conductor side portion when viewed from one radial side. One of the segment conductors, which is a bent joint extension portion that is bent so that the other of the pair of joint extension portions extends in the circumferential direction to the side opposite to the linear joint extension portion. Using the side bend segment conductor, the linear joint extension portion of one of the one side bend segment conductors and the bend joint extension portion of another one of the one side bend segment conductors are joined together to join the joint. The armature for rotary electric machines as described in any one of Claim 1 to 3 in which the part is formed. The coil has an n-layer winding structure in which n pieces of the conductor side portions (n: an integer of 2 or more) are arranged in the radial direction in each slot,
For the first wave coil of n layers or the second wave coil of n layers, use the segment conductors having a common shape for each layer,
At least one layer of the segment conductors is a linear joint extension portion in which one of the pair of joint extension portions extends in the same straight line as the conductor side portion when viewed from one side in the radial direction. The other side of the extension part is a one-side bent segment conductor that is a bent joint extension part that is bent so as to extend to the opposite side of the linear joint extension part in the circumferential direction. Both side bends in which the segment conductor is a bent joint extension portion that is bent so that both of the pair of joint extension portions extend in the circumferential direction opposite to the joint extension portion. The armature for a rotating electrical machine according to claim 1, wherein the armature is a segment conductor. The coil includes a wave winding coil set including the first wave winding coil of n layers and the second wave winding coil of n layers for three phases of a first phase, a second phase, and a third phase,
The armature core includes two adjacent slots for the first phase, two adjacent slots for the second phase, and two adjacent slots for the third phase. Are arranged so that they appear repeatedly along the circumferential direction in the order of description,
For each of the n sets of junction crossing portions formed at the same circumferential position in the wave winding coil set of each phase, n pieces of the junction extension portions constituting the set of the junction crossing portions. The armature for a rotating electrical machine according to claim 5, wherein the joint portions are dispersedly arranged within a half range of a circumferential range where the set of joint transition portions is located.

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