JP2010239798A - Armature for rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an armature for a rotary electric machine which can be configured compact as a whole and offers proper manufacturability. <P>SOLUTION: The armature for the rotary electric machine includes a cylindrical core 11, and a coil 19 having a plurality of side conductors 21 arranged in slots 12 and a plurality of end conductors 31 connecting side conductors 21 arranged in different slot 12 to each other. Each end conductor 31 at least on one side in the axial direction of the core 11 is made of a plate-like member having an axial step at a given position in the circumferential direction and is formed, in such a way that one side portion on circumferential one side to the step is located axially outside relative to the other side portion on the circumferential other side; and the end conductors 31 at least on one side in the axial direction are arranged circumferentially, such that one side portions and the other side portions overlap axially between end conductors 31 which are adjacent to each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an armature for a rotating electrical machine having a cylindrical core in which a plurality of slots extending in the axial direction are distributed in the circumferential direction, and a plurality of coils wound around the slots by distributed winding.

  An armature for a rotating electrical machine having a cylindrical core in which a plurality of slots extending in the axial direction are distributed in the circumferential direction and a multi-phase coil wound around the slots in a distributed winding manner. The coil includes a plurality of side conductors arranged in the slots and a plurality of end conductors connecting the side conductors arranged in different slots in the circumferential direction at both ends in the axial direction of the core. What has been configured is already known (see, for example, Patent Document 1 below).

  In the armature for a rotating electrical machine described in Patent Document 1, one side conductor is arranged in each slot, and two side conductors arranged in different slots have three types of end portions. A coil is configured by being appropriately connected in the circumferential direction by a conductor. In this armature for a rotating electrical machine, side conductors are respectively inserted in the slots in the axial direction, and then the two side conductors are connected in the circumferential direction by predetermined end conductors at both axial ends of the core. Can do. Therefore, there is an advantage that it is easy to wind the coil around the slot as compared with the case where each turn of the coil is configured by a single continuous conductor.

JP 2000-270506 A

  However, in the armature for a rotating electrical machine described in Patent Document 1, the side conductors having the same length have a predetermined period so that the protruding height from the axial end surface of the core changes stepwise in the circumferential direction. In the slot. Then, for each period, two side conductors arranged in different slots are connected in the circumferential direction by the first end conductor on one axial side of the core, and the first side conductor is arranged on the other axial side. Are connected in the circumferential direction by second and third end conductors having different shapes. Each end conductor is formed in a flat plate shape. In such a configuration, when viewed from the outside in the radial direction, useless spaces having a substantially triangular shape are generated on both sides in the axial direction of the core every cycle (see FIG. 3 of Patent Document 1). As a result, there is a problem that the axial length is increased correspondingly and the entire armature for a rotating electrical machine is enlarged. In addition, since a coil is formed by connecting a plurality of side conductors using three types of end conductors having different shapes for each cycle and repeating them for a predetermined period, the assembly procedure is complicated and manufacturability is increased. There was a problem that it was not good.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an armature for a rotating electrical machine that can be compactly configured as a whole and has excellent manufacturability.

  To achieve this object, a cylindrical core having a plurality of axially extending slots distributed in the circumferential direction according to the present invention, and a multi-phase coil wound around the slots in a distributed winding manner. A plurality of side conductors arranged in the slot, and a plurality of side conductors arranged in different slots are connected in the circumferential direction at both axial end portions of the core. The feature structure of the armature for a rotating electrical machine configured to include an end conductor is a plate in which the end conductor on at least one axial side of the core has an axial step portion at a predetermined position in the circumferential direction. And is formed in a shape in which one side portion on one side in the circumferential direction with respect to the stepped portion is positioned on the outer side in the axial direction with respect to the other side portion on the other side in the circumferential direction. A plurality of said end conductors , In that it is the one sequence in a state in which the side portion and the other side portion overlaps in the axial direction in the circumferential direction between the end conductors adjacent to each other.

In the present application, the directions of “axial direction”, “radial direction”, and “circumferential direction” are determined based on a cylindrical core. At this time, each direction about each conductor which comprises a coil shall be prescribed | regulated as a direction in the state by which the coil was wound by the slot.
The “rotary electric machine” is used as a concept including a motor (electric motor), a generator (generator), and a motor / generator that performs both functions of the motor and the generator as necessary.

In the above configuration, since it is possible to connect the plurality of side conductors and the plurality of end conductors at both axial ends of the core after inserting the plurality of side conductors in the axial direction into the slot, The coil can be easily wound around the slot.
Further, according to the above characteristic configuration, the plurality of end conductors at least on one side in the axial direction with respect to the core are composed of plate-like members having step portions in the axial direction at predetermined positions in the circumferential direction, and these are adjacent to each other. Since the one side part and the other side part are arranged in the circumferential direction between the end conductors in the axial direction, the axial length can be kept short at least on one side of the core in the axial direction. The entire armature for an electric machine can be configured compactly.
In addition, according to the above-described characteristic configuration, the plurality of end conductors on one side in the axial direction with respect to the core can be assembled to the side conductors in a state of being annularly arranged and integrated over the entire circumferential direction. Therefore, manufacturability is improved.
Therefore, the whole armature can be configured compactly, and an armature for a rotating electrical machine excellent in manufacturability can be provided.

  Here, the end conductor is arranged on one side in the radial direction with respect to the connected side conductor, and a plurality of the side conductors are arranged in the radial direction in each of the slots, The protruding height of the side conductor from the axial end surface of the core is set so as to increase sequentially from the side conductor on one side in the radial direction to the side conductor on the other side in the radial direction. It is preferable that the side conductors arranged at the same position in the radial direction are connected to the same end conductor.

  According to this configuration, when a plurality of side conductors are arranged in the radial direction in each slot, the side conductors arranged at the same position in the radial direction are arranged in the radial direction from one side in the radial direction. To the other side, a plurality of end conductors arranged in the circumferential direction can be sequentially connected. The side conductors arranged at the same position in the radial direction in different slots are connected by a plurality of end conductors arranged in the circumferential direction, and the end of the side conductor on the other side in the axial direction of the core is connected. By properly connecting, one turn of the coil is constructed. Therefore, according to said structure, the coil of the multi-layer winding according to the number of the side conductors arrange | positioned along with radial direction can be comprised.

  Further, in the configuration in which a plurality of the side conductors are arranged in the radial direction in each of the slots, the end conductor is connected to the side conductor arranged on the other radial side in the slot. It is preferable that the structure is formed such that the radial width is wider and the axial width is narrower.

  According to this configuration, for example, the radial width and the axial width of all the end conductors are axially compared with the case where the end conductors are connected to the side conductor on the most radial side. The length can be shortened. Therefore, the entire armature for a rotating electrical machine can be configured more compactly.

  Further, the end conductors are arranged so that the radial positions of the end portions on one side in the radial direction are aligned, and the shafts are arranged so that the cross-sectional areas of the end conductors are substantially the same according to the radial width. A configuration in which the direction width is set is preferable.

  According to this configuration, the electric resistance value in each end conductor can be made substantially constant. Therefore, it is possible to suppress the occurrence of inconvenience such as local increase in the amount of heat generated by Joule heat in the coil.

  In addition, n (n is a natural number of 2 or more) side conductors are arranged in each of the slots, and the end conductors on the other side in the axial direction with respect to the core are all located at predetermined positions in the circumferential direction. The connecting member is formed of a plate-shaped member having a stepped portion in the axial direction, and has an in-turn connecting conductor, an inter-turn connecting conductor, and a neutral conductor. Or, any one of the side conductors arranged kth from the outside (k is an all natural number of 1 or more and less than n) and any of the side conductors arranged (k + 1) th, The side conductors that are connected by the inter-turn connecting conductor that forms a coil of each phase and are not connected to the inter-turn connecting conductor are respectively connected by the in-turn connecting conductor that forms a coil of each phase, and the slot conductor Among the side conductors arranged nth from the inside or outside in the radial direction in the inside of the cable, the sides forming a coil of each phase not connected to either the inter-turn connection conductor or the in-turn connection conductor The partial conductor is preferably connected to the neutral conductor.

According to this structure, the armature for rotary electric machines provided with the wave winding coil of n layer winding can be comprised appropriately. In addition, on the other side in the axial direction with respect to the core, a plurality of side conductors are connected by inter-turn connecting conductors, in-turn connecting conductors, and neutral conductors having similar shapes, respectively. Connections between turns and neutral points can be connected in a similar manner. Therefore, the structure for connection on the other side in the axial direction of the core can be simplified to further improve the manufacturability.
In addition, these inter-turn connection conductors, intra-turn connection conductors, and neutral conductors are configured to have shapes similar to the end conductors on one side in the axial direction with respect to the core. The one side portion and the other side portion can be arranged in the circumferential direction between adjacent conductors in the axial direction. Therefore, the axial length can be kept short on the other side in the axial direction as well as on the one side in the axial direction. Therefore, the entire armature for a rotating electrical machine can be configured more compactly.

  At this time, it is preferable that the in-turn connecting conductor and the two side conductors connected thereto are configured as an integrally formed U-shaped conductor.

  According to this configuration, since the in-turn connecting conductor and the two side conductors are already integrally connected on the other side in the axial direction, the side conductors on the other side in the axial direction of the core The number of connection places between the end conductors can be greatly reduced. Therefore, it is possible to improve the production efficiency by further improving the manufacturability.

  In the configuration of the armature for a rotating electrical machine described so far, each of the end conductors has the stepped portion at the center portion in the circumferential direction, and the offset amount by the stepped portion is substantially equal to the plate thickness of the plate-like member. A configuration in which the values are set to be equal is preferable.

  According to this configuration, among the plurality of end conductors arranged in the circumferential direction, the end conductors that are adjacent to each other are such that the substantially entire one side portion and the substantially entire other side portion are close to each other in the axial direction. Will be placed opposite each other. Therefore, the axial length (thickness) of the coil end portion per turn can be suppressed to the same level as the thickness of the two plate-like members forming the end conductor. Therefore, the entire armature for a rotating electrical machine can be configured more compactly.

  In addition, it is preferable that the connection portion of the end conductor is configured to be fitted to the connection portion of the side conductor from the axial direction.

  According to this configuration, the plurality of end conductors can be appropriately connected by fitting the end conductors and the side conductors in the axial direction in a state where the plurality of end conductors are annularly arranged over the entire circumferential direction. .

  Further, the slot preferably has a configuration in which the circumferential width of the opening that opens on one radial side is narrower than the circumferential width inside the slot that is located on the other radial side of the opening. It is.

The armature for a rotating electrical machine described so far is configured such that a coil wound in a slot can be divided into a plurality of side conductors and a plurality of end conductors. Therefore, it is possible to connect a plurality of side conductors and a plurality of end conductors at both ends in the axial direction of the core after inserting the plurality of side conductors in the slot in the axial direction. Further, the slot of the core is formed so that the circumferential width of the opening that opens on one side in the radial direction is narrower than the circumferential width inside the slot that is located on the other side in the radial direction than the opening. The present invention can be applied particularly effectively to an armature for a rotating electrical machine having an open slot.
In the above configuration, since the slot is a semi-open type, the amount of magnetic flux generated by the field reaching the surface of the side conductor constituting the coil can be reduced. Therefore, generation | occurrence | production of an eddy current can be suppressed, an eddy current loss can be reduced, and energy efficiency can be improved.

  In addition, it is preferable that the circumferential side walls of the plurality of teeth positioned between the adjacent slots and extending in the axial direction are formed in parallel to each other.

  According to this configuration, the cross-sectional area of the surface perpendicular to the radial direction in each tooth is substantially equal over the entire radial direction, so the magnitude of the magnetic flux density of the magnetic field generated by the field passing through each tooth is reduced. It can be made substantially uniform in the radial direction. Therefore, the maximum magnetic flux density until magnetic saturation occurs in each tooth can be increased, and the energy efficiency of the rotating electrical machine can be improved.

  Further, in the configuration in which both side walls in the circumferential direction of each tooth are formed in parallel to each other, the side conductor is a linear conductor having a rectangular cross section, and a plurality of the side parts are provided in each slot. It is preferable that the conductors are arranged side by side in the radial direction, and the side conductors are formed so that the circumferential width is wider and the radial width is narrower as the radial conductor is arranged outside. .

When both side walls in the circumferential direction of each tooth are formed parallel to each other, the slot formed between the teeth has a cross-sectional shape in a plane orthogonal to the axial direction, and the circumferential width is narrower toward the inner side in the radial direction. And it becomes a substantially trapezoid shape whose circumferential direction width | variety is wide toward the radial direction outer side. According to this configuration, by forming the circumferential width of the side conductors arranged side by side in the radial direction in the slot so as to be wider toward the outer side in the radial direction according to the slot shape, The gap portion in the slot can be reduced, and the space factor of the coil can be improved.
In this case, the radial width of the entire coil can be narrowed by forming the radial width of each side conductor so that the radial width of the side conductor is reduced, and the radial width of the core can be reduced. Can be reduced. Therefore, it is possible to increase the size of the rotor as the field and improve the output while keeping the outer diameter of the entire rotating electrical machine constant. Furthermore, in this configuration, the cross-sectional areas of the surfaces orthogonal to the axial direction (coincident with the energization direction) of each side conductor can be made substantially equal. Therefore, since the electric resistance value in each side conductor can be made substantially constant, it is possible to suppress the occurrence of inconveniences such as local increase in the amount of heat generated by Joule heat in the coil.
In the present invention, since the coil can be divided into a plurality of side conductors and a plurality of end conductors, the circumferential width and radial width of the side conductors are determined according to the radial position in the slot. It is easy to change appropriately. Therefore, the above configuration is particularly suitable as a configuration that can be employed in the armature for a rotating electrical machine according to the present invention.

  Further, the armature for a rotating electrical machine described so far has a plurality of the end conductors in a circumferential direction in a state where the one side portion and the other side portion overlap in the axial direction between the end conductors adjacent to each other. It is preferable that the plurality of side conductors are connected in the axial direction in an integrated state.

Each end conductor is composed of a plate-like member having an axial step at a predetermined position in the circumferential direction, and the one side portion and the other side portion are overlapped in the axial direction between the adjacent end conductors. When arranged in the direction and sequentially connected, inevitably at least one of the plurality of end conductors arranged in the circumferential direction is the other side portion of the end conductor adjacent to one side in the circumferential direction. And one end portion of the end conductor adjacent to the other side in the circumferential direction needs to be inserted in the radial direction. However, with respect to one end conductor, in a state where two end conductors adjacent to both sides in the circumferential direction are connected to the corresponding side conductors, the side conductors are inserted into the space between them in the radial direction. Connecting is often difficult.
According to said structure, all the edge parts of the said integrated state are made into the state which integrated the some edge part conductor of the axial direction one side with respect to the core over the whole circumferential direction previously. Since the conductors can be connected to the corresponding side conductors in the axial direction, the manufacturability can be further improved.

  In the configuration of the armature for a rotating electrical machine as described above, the end conductors adjacent to each other are arranged in the circumferential direction and integrated in the axial direction with respect to the plurality of side conductors. A plurality of the end conductors on one side in the axial direction are arranged and integrated in the circumferential direction with the one side portion and the other side portion overlapping in the axial direction between the end conductors adjacent to each other. A side coil end unit, and the one side coil end unit is formed of a resin mold in a state in which a plurality of the end conductors are coated with a resin on at least one axial surface of each end conductor. It is preferable that they are integrated and configured.

  According to this configuration, by forming the one-side coil end unit, the connection between each end conductor and each side conductor can be simplified. At that time, the one-side coil end unit can be appropriately formed by a resin mold having excellent manufacturability. In addition, a plurality of end conductors can be electrically integrated between different phases by fixing and integrating each end conductor with at least one surface in the axial direction covered with a resin having high electrical insulation. It is easy to ensure insulation.

  The one-side coil end unit further includes a plurality of radial protrusions protruding radially outward in a circumferentially distributed state, and a fastening member is provided in each of the radial protrusions. It is preferable that an insertion hole that can be inserted in the axial direction is formed, and the one-side coil end unit and the core are integrally fixed by the fastening member that is inserted through the insertion hole.

  According to this configuration, it is easy to fix and integrate the one-side coil end unit and the core by inserting a fastening member such as a bolt in the axial direction through the insertion hole formed in the radial protrusion. In this case, the one-side coil end unit and the core may be configured to be fixed and integrated only between them regardless of other members, and for example, a case for accommodating a rotating electric machine, etc. It may be a configuration that is fixed and integrated.

It is sectional drawing which shows the whole structure of the rotary electric machine which concerns on 1st embodiment. It is a perspective view which shows the whole structure seen from the axial direction one side of the stator which concerns on 1st embodiment. It is a perspective view which shows the whole structure seen from the axial direction other side of the stator which concerns on 1st embodiment. It is sectional drawing in the cross section orthogonal to the axial direction of the stator which concerns on 1st embodiment. It is an axial sectional view of the stator concerning a first embodiment. It is the schematic diagram shown in the state which expand | deployed the structure of the coil which concerns on 1st embodiment in planar shape. It is a perspective view which shows the one side coil end unit which concerns on 1st embodiment. It is explanatory drawing which shows the assembly | attachment procedure of the stator which concerns on 1st embodiment. It is a perspective view which shows the assembly | attachment procedure of the stator which concerns on 1st embodiment in steps. It is a perspective view which shows the assembly | attachment procedure of the stator which concerns on 1st embodiment in steps. It is a perspective view which shows the assembly | attachment procedure of the stator which concerns on 1st embodiment in steps. It is a perspective view which shows the assembly | attachment procedure of the stator which concerns on 1st embodiment in steps. It is a perspective view which shows the assembly | attachment procedure of the stator which concerns on 1st embodiment in steps. It is a perspective view which shows the assembly | attachment procedure of the stator which concerns on 1st embodiment in steps. It is a perspective view which shows the assembly | attachment procedure of the stator which concerns on 1st embodiment in steps. It is a perspective view which shows the assembly | attachment procedure of the stator which concerns on 1st embodiment in steps. It is a perspective view which shows the assembly | attachment procedure of the stator which concerns on 1st embodiment in steps. It is a perspective view which shows the assembly | attachment procedure of the stator which concerns on 1st embodiment in steps. It is a perspective view which shows the assembly | attachment procedure of the stator which concerns on 1st embodiment in steps. It is a perspective view which shows the assembly | attachment procedure of the stator which concerns on 1st embodiment in steps. It is sectional drawing in the cross section orthogonal to the axial direction of the stator which concerns on 2nd embodiment. It is the schematic diagram shown in the state which expand | deployed the structure of the coil which concerns on 3rd embodiment in planar shape. It is an axial sectional view of a stator according to a third embodiment. It is a perspective view which shows the whole structure of the one end coil unit which concerns on other embodiment. It is a perspective view which shows the whole structure seen from the axial direction one side of the stator which concerns on other embodiment.

[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. In the present embodiment, the case where the armature for a rotating electrical machine according to the present invention is applied to the stator 2 of the rotating electrical machine 1 will be described as an example. FIG. 1 is a cross-sectional view showing the overall configuration of the rotating electrical machine 1 according to the present embodiment, and FIGS. 2 and 3 are perspective views showing the overall configuration of the stator 2 according to the present embodiment. The coil 19 included in the stator 2 according to the present embodiment is configured to be divided into a plurality of side conductors 21 and a plurality of end conductors 31. The stator 2 having such a coil 19 is configured to be compact in its entirety and the end conductor 31 on one side in the axial direction has a predetermined circumferential direction so that the manufacturability can be improved. While having the step part 35 in the position, it is characterized in that a plurality of end conductors 31 are arranged in the circumferential direction. Hereinafter, the configuration of each part of the rotating electrical machine 1 will be described in detail.

1. Overall Configuration of Rotating Electric Machine As shown in FIG. 1, the rotating electric machine 1 includes a stator 2, a rotor 3, and a case 5. The stator 2 includes a coil 19, and a magnetic field can be generated by passing a current through the coil 19. In the present embodiment, the stator 2 corresponds to the “armature for rotating electrical machine” in the present invention. The stator 2 is fixed to the inner peripheral surface of the case 5. The configuration of the stator 2 will be described in detail later. Further, a rotor 3 as a field magnet provided with a permanent magnet (not shown) is supported on a radially inner side of the stator 2 so as to be relatively rotatable with respect to the stator 2 with the rotor shaft 4 as a rotation axis. Yes. That is, the rotating electrical machine 1 in this embodiment is an inner rotor type rotating electrical machine including a stator 2 as an armature. The case 5 is formed in a cylindrical shape in which an end wall 5a is provided on one side in the axial direction. The case 5 opens to the other side in the axial direction, and a cover 6 is attached to the case 5 so as to close the opening. And the bearing 7 is provided in the radial direction center part of the end wall 5a of the case 5 and the cover 6, and the rotor 3 and the rotor shaft | axis 4 are rotatably supported with respect to the case 5 and the cover 6 via the bearing 7. FIG. ing.

2. Configuration of Stator As shown in FIGS. 2 and 3, the stator 2 includes a stator core 11 and a coil 19. The stator core 11 is formed by laminating a plurality of annular plate-shaped electromagnetic steel plates, and is formed in a substantially cylindrical shape. On the inner peripheral surface of the stator core 11, a plurality of slots 12 extending in the axial direction are distributed in the circumferential direction and provided at predetermined circumferential intervals. In the present embodiment, the stator core 11 corresponds to a “core” in the present invention. Each slot 12 has the same cross-sectional shape in a plane orthogonal to the axial direction, and has a predetermined width and depth. In the present embodiment, the stator core 11 is provided with a total of 48 slots 12 on the entire circumference thereof. In the slot 12 of the stator core 11, a coil 19 of a plurality of phases (in this example, three phases of U phase, V phase, and W phase) is wound with distributed winding.

  As shown in FIG. 4, teeth 15 extending in the axial direction are provided between adjacent slots 12 of the stator core 11. The teeth 15 are provided with circumferential wall portions 17 extending in the axial direction and the radial direction on both sides in the circumferential direction. A space between two circumferential wall portions 17 that are circumferentially opposed between the adjacent teeth 15 is a slot 12. In this embodiment, the circumferential direction wall part 17 of the circumferential direction both sides in each tooth | gear 15 is each formed along the radial direction. Therefore, in this embodiment, the cross-sectional shape of the tooth 15 in a cross section orthogonal to the axial direction is a substantially trapezoidal shape, and the cross-sectional shape of the slot 12 is a substantially rectangular shape. In each slot 12, a plurality of side conductors 21 constituting the coil 19 are arranged side by side in the radial direction (six in this example). The configuration of the coil 19 will be described later. An insulating sheet 18 is interposed between the slot 12 and the side conductor 21 in order to ensure electrical insulation between them. As the insulating sheet 18, for example, a sheet formed of a material having high electrical insulation and heat resistance such as a laminate of aramid fiber and polyethylene terephthalate can be used.

  At the radially inner end of the teeth 15, circumferential protrusions 16 that protrude in the circumferential direction and extend in the axial direction are provided on both sides in the circumferential direction of the teeth 15. The circumferential protrusion 16 is formed integrally with the tooth 15. An inner circumferential opening 13 that opens radially inward in the slot 12 is formed between two circumferentially projecting portions 16 provided in each of the teeth 15 adjacent to each other in the circumferential direction. Further, the space outside the inner peripheral opening 13 in the slot 12 in the radial direction is the slot interior 14. The circumferential width of the side conductors 21 arranged in the slot interior 14 is set to a value substantially equal to the circumferential width W3 of the slot interior 14 under the precondition that it can be physically inserted into the slot interior 14. ing. Thereby, the energy efficiency of the rotating electrical machine 1 is improved by improving the space factor of the coil 19 in the slot 12.

  Here, in the present embodiment, the circumferential width W1 of the inner circumferential opening 13 is formed narrower than the circumferential width W3 of the slot interior 14. That is, in this embodiment, the slot 12 of the stator core 11 is a semi-open slot. Therefore, when the rotor 3 rotates, the amount of magnetic flux from the permanent magnet included in the rotor 3 reaching the surface of the side conductor 21 constituting the coil 19 can be reduced. Therefore, generation | occurrence | production of the eddy current in the surface of the side conductor 21 can be suppressed, and an eddy current loss can be reduced. Thus, in the stator 2 according to the present embodiment, it is possible to achieve both improvement in the space factor of the coil 19 and reduction in eddy current loss.

3. Next, the configuration of the coil 19 will be described. The coil 19 according to the present embodiment has a circumferential direction between a plurality of side conductors 21 arranged in the slot interior 14 of the slot 12 and the side conductors 21 arranged in different slots 12 at both axial ends of the stator core 11. And a plurality of end conductors 31 connected to each other. Here, each of the coils 19 of each phase of the U phase, the V phase, and the W phase includes a plurality of side conductors 21 and a plurality of end conductors 31. In the following description, each member constituting the coil 19 is shown as a member such as 19u, 19v, and 19w, particularly when it is necessary to distinguish between the U phase, the V phase, and the W phase. The description will be made by adding lower case letters “u”, “v” and “w” after the sign.

3-1. Side conductor The side conductor 21 is configured by a linear conductor having a rectangular cross-sectional shape in a plane orthogonal to the axial direction. The material constituting the side conductor 21 can be, for example, copper or aluminum. As shown in FIGS. 5 and 6, the side conductor 21 is formed in a prismatic shape extending linearly in the axial direction, and is arranged in the slot 12 of the stator core 11. The axial length of the side conductor 21 is at least longer than the axial length of the stator core 11, and both end portions in the axial direction are longer than the end surfaces 11 a on both axial sides of the stator core 11 in the state of being disposed in the slot 12. Each protrudes. Further, as shown in FIG. 5, in the present embodiment, the plurality of side conductors 21 arranged in the slots 12 in the radial direction are arranged on the axis of the stator core 11 from the radial outer side toward the radial inner side. The protrusion height H from the direction end surface 11a is arranged so as to increase sequentially. That is, the protruding height H of the plurality of side conductors 21 from the axial end surface 11a of the stator core 11 is sequentially increased in the radial direction from the outermost side conductor 21 to the innermost side conductor 21. It is set to be. In the present embodiment, the radially outer side is the “radial one side”, and the radial inner side is the “radial other side”. As shown in FIG. 6, axial protrusions 22 that protrude further outward in the axial direction with respect to the central portion of the side conductor 21 are formed at both ends in the axial direction of the side conductor 21. The axial protrusion 22 has a substantially rectangular cross-sectional shape in a plane orthogonal to the axial direction, and functions as a connection portion of the side conductor 21. The surface of the side conductor 21 is covered with an insulating coating made of resin or the like except for the axial protrusion 22.

  In the present embodiment, the number of slots corresponding to each pole is “2”. Therefore, the side conductors 21u, 21v and 21w constituting the coil 19 of each phase of the U phase, the V phase and the W phase are arranged in two slots 12 adjacent to each other in the circumferential direction by repeating two by two sequentially. Yes.

3-2. End conductor on one side in the axial direction The end conductor 31 on one side in the axial direction is composed of a conductor made of a plate-like member having a rectangular cross-sectional shape in a plane orthogonal to the circumferential direction. The material constituting the end conductor 31 can be, for example, copper or aluminum. As shown in FIGS. 5 and 6, the end conductor 31 is formed in a thin plate shape substantially parallel to the axial end surface 11 a of the stator core 11 as a whole. Further, the end conductor 31 has an axial step 35 at a predetermined position in the circumferential direction, in the present embodiment, at the center in the circumferential direction. And the one side part 36 of the circumferential direction one side rather than the said level | step-difference part 35 is offset by the axial direction outer side with respect to the other side part 37 of the circumferential direction other side. That is, the end conductor 31 is offset by the step portion 35 so that the axial distance from the axial end surface 11 a of the stator core 11 is longer in the one side portion 36 than in the other side portion 37. In the present embodiment, the offset amount L by the step portion 35 is set to a value that is substantially equal to the plate thickness t of the thin plate conductor that constitutes the end conductor 31.

  In the present embodiment, the end conductor 31 includes a circumferential conductor portion 32 that extends in the circumferential direction along the stator core 11, and is bent radially inward at both circumferential ends of the circumferential conductor portion 32. And a radial conductor portion 33 that extends. The circumferential conductor portion 32 is a conductor portion that occupies most of the end conductor 31, and the step portion 35 is provided in the circumferential center portion thereof. An axial connection portion 34 connected to the side conductor 21 is formed at the radially inner end of the radial conductor portion 33. In the present embodiment, the axial connection portion 34 has a shape that opens to both end surfaces of the end conductor 31 in the axial direction and to end surfaces on the radially inner side. The opening of the axial connection portion 34 has a substantially rectangular shape when viewed from the axial direction, corresponding to the cross-sectional shape of the axial protrusion 22, and functions as a connection portion of the end conductor 31. The surface of the end conductor 31 is covered with an insulating film made of resin or the like except for the axial connection portion 34. Thus, the axial protrusions 22 of the side conductors 21 and the axial connection portions 34 of the end conductors 31 formed to have mutually complementary shapes can be fitted from the axial direction. ing.

  Further, in the present embodiment, as described above, the side conductors 21u, 21v, and 21w constituting the coil 19 of each phase are sequentially repeated two by two, and are disposed in the two slots 12 adjacent to each other in the circumferential direction. . At this time, a set of two side conductors 21 arranged adjacent to each other in the circumferential direction constituting the in-phase coil 19, and two sets arranged adjacent to each other in the circumferential direction in total, four in-phase sides The conductor 21 is connected in the circumferential direction by the end conductor 31. More specifically, as shown in FIG. 6, of the two sets of four in-phase side conductors 21, the two side conductors 21 arranged 5 slots apart on the inner side in the circumferential direction are the first ones. Two side conductors 21 connected in the circumferential direction by the end conductor 31a and separated by 7 slots on the outer side in the circumferential direction are connected in the circumferential direction by the second end conductor 31b. The circumferential conductor 32 in the first end conductor 31a is disposed radially inward with respect to the circumferential conductor 32 in the second end conductor 31b. Twelve such end conductors 21 are provided for each phase, four for each phase.

  As shown in FIG. 2, the plurality of end conductors 31 on one side in the axial direction with respect to the stator core 11 are in a state where the one side portion 36 and the other side portion 37 overlap in the axial direction between the end conductors 31 adjacent to each other. Are arranged in the circumferential direction. In the present embodiment, the plurality of end conductors 31 form a one-side coil end unit U1 that is arranged in the circumferential direction and integrated. That is, of the two end conductors 31 adjacent to each other, the one side portion 36 of the end conductor 31 on the other side in the circumferential direction is opposed to the outer side in the axial direction of the other side portion 37 of the end conductor 31 on the one side in the circumferential direction. The one-side coil end unit U1 is formed by arranging the plurality of end conductors 31 in an annular manner by repeating the arrangement.

  In this embodiment, the side conductors 21u, 21v, and 21w constituting the coil 19 of each phase are sequentially repeated two by two, and arranged in two slots 12 adjacent to each other in the circumferential direction. The end conductors 31u, 31v, and 31w that constitute the coils 19 of the phase, V phase, and W phase are also sequentially and repeatedly arranged in the circumferential direction. Therefore, the one-side portion 36 of the V-phase end conductor 31v is opposed to the axially outer side of the other-side portion 37 of the U-phase end conductor 31u, and the axis of the other-side portion 37 of the V-phase end conductor 31v is arranged. One side portion 36 of the W-phase end conductor 31w is opposed to the outer side in the direction, and the one side portion 36 of the U-phase end conductor 31u is arranged on the outer side in the axial direction of the other side portion 37 of the W-phase end conductor 31w. Opposed. And the one side coil end unit U1 is formed by repeating this sequentially in the circumferential direction. Such one side coil end unit U1 is formed using the end conductor 31 of the same shape, and the structure is simplified.

  The plurality of end conductors 31 constituting the same one-side coil end unit U1 are connected to the respective side conductors 21 arranged at the same position in the radial direction in the slot 12. Here, in the present embodiment, each end conductor 31 is disposed radially outside the side conductor 21, and the axial connection portion 34 and the axial projection 22 are fitted in the axial direction. In combination, each side conductor 21 is connected (see FIG. 7). Further, in the present embodiment, as shown in FIG. 5, a plurality of side conductors 21 arranged in the radial direction in each slot 12 are arranged in the stator core 11 from the radially outer side toward the radially inner side. It arrange | positions so that the protrusion height H from the axial direction end surface 11a may become high sequentially. Accordingly, the one-side coil end unit U1 connected to the radially outer side conductor 21 having a low protruding height H is disposed at a position closest to the axial end surface 11a of the stator core 11 in the axial direction. The one side coil end unit U1 connected to the higher radial inner side conductor 21 is sequentially stacked and arranged so as to be positioned away from the axial end surface 11a.

  As shown in FIG. 5, the radially outer end portions of the end conductors 31 are arranged in the vicinity of the radially outer end portion of the stator core 11 with the radial position aligned. Therefore, as the end conductor 31 is connected to the side conductor 21 disposed radially inward in the slot 12, the radial width of the circumferential conductor 32 is wider. Further, the radial width of the circumferential conductor portion 32 becomes narrower as it is connected to the side conductor 21 disposed radially outside in the slot 12. Furthermore, in the present embodiment, the end conductor 31 is connected to the side conductor 21 disposed radially inward in the slot 12, and the axial width of the circumferential conductor 32 is narrower. . Moreover, the axial direction width | variety of the circumferential direction conductor part 32 is so wide that it is connected to the side part conductor 21 arrange | positioned radially outside in the slot 12. FIG. The end conductors 31 thus formed have substantially the same cross-sectional area between the end conductors 31 of the respective layers in the plane perpendicular to the energization direction (circumferential direction). This suppresses the occurrence of inconveniences such as local increase in the amount of heat generated by Joule heat (for example, the end conductor 31 forming the layer closest to the stator core 11) when current is passed through the coil 19. Can do.

  In the present embodiment, the one-side coil end unit U1 is integrated with a resin mold. At this time, the end conductors 31 constituting the one-side coil end unit U1 are integrated with at least one of the surfaces in the axial direction covered with a resin. In this example, as shown in FIG. 5, the surfaces on both sides in the axial direction of the end conductor 31 are covered with resin. Thus, in this example, the one-side coil end unit U1 can be appropriately formed by a resin mold excellent in manufacturability. Further, by securing and integrating the end conductors 31 in a state where the surfaces on both sides in the axial direction are covered with a resin having high electrical insulation, it is easy to ensure electrical insulation between different phases. That is, between the other side portion 37 of the U-phase end conductor 31u and the one side portion 36 of the V-phase end conductor 31v, the other side portion 37 of the V-phase end conductor 31v and the W-phase end conductor. It is easy to ensure electrical insulation between the one side portion 36 in 31w and between the other side portion 37 in the W-phase end conductor 31w and one side portion 36 in the U-phase end conductor 31u. Is possible.

3-3. End conductor on the other side in the axial direction The end conductor 31 on the other side in the axial direction includes an in-turn connection conductor 41, an inter-turn connection conductor 51, and a neutral conductor 61. The inter-turn connecting conductor 51 is a conductor that connects adjacent turns in the coil 19 of each phase. The inter-turn connecting conductor 51 of each phase is one of the side conductors 21 having the same phase arranged in the slot 12 from the radially outer side (k is all natural numbers of 1 or more and less than 6), and (k + 1). ) Any one of the in-phase side conductors 21 arranged in the second position is connected. The in-turn connecting conductor 41 is a conductor that connects the side conductors 21 in the same turn in the coil 19 of each phase. The in-turn connecting conductor 41 of each phase connects the side conductors 21 that are not connected to the inter-turn connecting conductor 51. The neutral conductor 61 is a conductor that connects the coils 19 of each phase. The neutral conductor 61 is one of the inter-turn connection conductor 51 and the in-turn connection conductor 41 among the side conductors 21 arranged on the innermost circumferential side (sixth from the radial outside in this example) in the slot 12. The side conductors 21 forming the coils 19 of the respective phases not connected to each other are connected.

3-3-1. In-turn connecting conductor The in-turn connecting conductor 41 is made of a conductor made of a plate-like member having a rectangular cross-sectional shape in a plane orthogonal to the circumferential direction. The material constituting the in-turn connection conductor 41 can be, for example, copper or aluminum. As shown in FIGS. 5 and 6, the in-turn connecting conductor 41 is formed in a thin plate shape substantially parallel to the axial end surface 11 a of the stator core 11 as a whole. The in-turn connecting conductor 41 has a step 45 in the axial direction at a predetermined position in the circumferential direction, in the present embodiment, at the center in the circumferential direction. The other side portion 47 on the other side in the circumferential direction with respect to the stepped portion 45 is offset outward in the axial direction with respect to the one side portion 46 on the one side in the circumferential direction. That is, the in-turn connecting conductor 41 is offset by the step 45 so that the axial distance from the axial end surface 11 a of the stator core 11 is longer in the other side portion 47 than in the one side portion 46. In the present embodiment, the offset amount L by the step portion 45 is set to a value substantially equal to the plate thickness t of the thin plate conductor constituting the in-turn connecting conductor 41. The plate thickness t is substantially equal to the plate thickness t of the end conductor 31 in each turn.

  In the present embodiment, the in-turn connecting conductor 41 includes a circumferential conductor portion 42 that extends in the circumferential direction along the stator core 11, and a radially inner side that is bent radially at both circumferential ends of the circumferential conductor portion 42. And a radial conductor portion 43 extending in the vertical direction. The circumferential conductor portion 42 is a conductor portion that occupies most of the in-turn connecting conductor 41, and the step 45 is provided at the circumferential center portion thereof. An axial connection portion 44 connected to the side conductor 21 is formed at the radially inner end of the radial conductor portion 43. In this embodiment, the axial direction connection part 44 is made into the shape opened to the end surface of the axial direction both sides and radial direction inner side of the connection conductor 41 in a turn. The opening of the axial connection portion 44 has a substantially rectangular shape when viewed from the axial direction, corresponding to the cross-sectional shape of the axial projection 22, and functions as a connection portion of the in-turn connection conductor 41. The surface of the in-turn connecting conductor 41 is covered with an insulating film made of resin or the like except for the axial connecting portion 44. In this way, the axial protrusions 22 of the side conductors 21 formed with complementary shapes corresponding to each other and the axial connection parts 44 of the in-turn connection conductors 41 can be fitted from the axial direction. Has been.

  Further, in the present embodiment, two sets of two side conductors 21 arranged adjacent to each other in the circumferential direction constituting the in-phase coil 19 are set as one set, and a total of four sets arranged adjacent to each other in the circumferential direction. The in-phase side conductors 21 are connected in the circumferential direction by the in-turn connecting conductor 41. More specifically, of the two sets of four in-phase side conductors 21, the two side conductors 21 separated by 5 slots on the inner side in the circumferential direction are surrounded by the first turn connecting conductor 41 a. The two side conductors 21 that are connected in the direction and separated by seven slots on the outer side in the circumferential direction are connected in the circumferential direction by the second turn connecting conductor 41b. The circumferential conductor 42 in the first turn connecting conductor 41a is disposed radially inward with respect to the circumferential conductor 42 in the second turn connecting conductor 41b. Nine such in-turn connection conductors 41 are provided for each phase, three for each phase.

  The in-turn connecting conductors 41 adjacent to each other are arranged in the circumferential direction with the one side portion 46 and the other side portion 47 overlapping in the axial direction therebetween. Further, in the present embodiment, a part of the nine in-turn connecting conductors 41 (here, seven turns excluding one U-phase in-turn connecting conductor 41u and one W-phase in-turn connecting conductor 41w). The inner connection conductor 41) forms the other coil end unit U2 that is arranged in the circumferential direction and integrated (see FIG. 10). That is, of the two adjacent connecting conductors 41 in the turn, the other side portion of the connecting conductor 41 in the turn on one side in the circumferential direction on the outer side in the axial direction of the one side portion 46 in the connecting conductor 41 in the other turn in the circumferential direction. The other coil end unit U2 is formed by arranging the plurality of in-turn connecting conductors 41 in a substantially arc shape by sequentially repeating this operation.

  In this embodiment, the side conductors 21u, 21v, and 21w constituting the coil 19 of each phase are sequentially repeated two by two, and arranged in two slots 12 adjacent to each other in the circumferential direction. The in-turn connecting conductors 41u, 41v, and 41w constituting the coils 19 of the phase, V phase, and W phase are also sequentially and repeatedly arranged in the circumferential direction. Therefore, the other side portion 47 of the W-phase in-turn connecting conductor 41w is disposed oppositely to the outer side in the axial direction of the one side portion 46 in the U-phase in-turn connecting conductor 41u. The other side portion 47 of the V-phase in-turn connecting conductor 41v is disposed opposite to the outer side in the axial direction of 46, and the U-phase in-turn connecting conductor 41u on the outer side in the axial direction of the one side portion 46 in the V-phase in-turn connecting conductor 41v. The other side portion 47 is disposed so as to face each other. And the other side coil end unit U2 is formed by repeating this sequentially in the circumferential direction. Such other side coil end units U2 are all formed using the in-turn connecting conductor 41 having the same shape, and the structure is simplified.

  The plurality of in-turn connecting conductors 41 constituting the same other coil end unit U2 are connected to the respective side conductors 21 arranged at the same position in the radial direction in the slot 12. Here, in the present embodiment, the connection conductors 41 in each turn are arranged radially outside the side conductors 21, and the axial connection parts 44 and the axial projections 22 are axially arranged. It fits and is connected to each side conductor 21. Further, in the present embodiment, as shown in FIG. 5, the side conductors 21 arranged in the radial direction in the respective slots 12 are arranged on the other side in the axial direction as in the one side in the axial direction. The protrusion height H from the axial end surface 11a of the stator core 11 is arranged so as to increase sequentially from the outer side in the radial direction toward the inner side in the radial direction. Accordingly, the other coil end unit U2 connected to the radially outer side conductor 21 having a low protruding height H is disposed at a position closest to the axial end surface 11a of the stator core 11 in the axial direction. The other coil end unit U2 connected to the higher radial inner side conductor 21 is sequentially stacked and arranged so as to be positioned away from the axial end face 11a.

  As shown in FIG. 5, the radially outer end portions of the in-turn connecting conductors 41 are arranged in the vicinity of the radially outer end portions of the stator core 11 so as to be aligned in the radial direction. Therefore, as the in-turn connecting conductor 41 is connected to the side conductor 21 disposed radially inward in the slot 12, the radial width of the circumferential conductor 42 is increased. Moreover, the radial direction width | variety of the circumferential direction conductor part 42 is so narrow that it is connected to the side part conductor 21 arrange | positioned radially outside in the slot 12. FIG. Furthermore, in the present embodiment, as the in-turn connecting conductor 41 is connected to the side conductor 21 arranged radially inward in the slot 12, the axial width of the circumferential conductor 42 becomes narrower. Yes. Moreover, the axial direction width | variety of the circumferential direction conductor part 42 is so wide that it is connected to the side part conductor 21 arrange | positioned radially outside in the slot 12. FIG. In the in-turn connecting conductor 41 formed in this way, the cross-sectional areas of the surfaces orthogonal to the energizing direction (circumferential direction) are substantially equal between the in-turn connecting conductors 41 of each layer. This suppresses the occurrence of inconveniences such as locally increasing the amount of heat generated by Joule heat (for example, by the in-turn connection conductor 41 forming the layer closest to the stator core 11) when a current is passed through the coil 19. be able to.

  In the present embodiment, the other-side coil end unit U2 is configured by being integrated by a resin mold. At this time, the in-turn connecting conductors 41 constituting the other coil end unit U2 are integrated with at least one of the surfaces in the axial direction covered with a resin. In this example, as shown in FIG. 5, the surfaces on both sides in the axial direction of the in-turn connecting conductor 41 are covered with resin. Thus, in this example, the other side coil end unit U2 can be appropriately formed by a resin mold excellent in manufacturability. In addition, by securing and integrating the connecting conductors 41 in each turn in a state where the surfaces on both sides in the axial direction are covered with a resin having high electrical insulation, it is easy to ensure electrical insulation between different phases. . That is, between the other side portion 47 of the U-phase in-turn connecting conductor 41u and the one side portion 46 of the V-phase in-turn connecting conductor 41v, the other side portion 47 of the V-phase in-turn connecting conductor 41v and the W-phase. Electrical insulation between the one-side portion 46 of the in-turn connecting conductor 41w and between the other side portion 47 of the W-phase in-turn connecting conductor 41w and one side portion 46 of the U-phase in-turn connecting conductor 41u. Can be easily secured.

  The pair of side conductors 21 connected to the in-turn connection conductor 41 of each phase is connected to the one side portion 36 or the other side portion 37 of the end conductor 31 on one side in the axial direction, and in the axial direction. The other side portion 47 or one side portion 46 of the in-turn connecting conductor 41 is connected on the other side. In the example of FIG. 6, for example, among the pair of side conductors 21 indicated by a solid line, the second pair of side conductors 21 from the left is one side of the end conductor 31 on one side in the axial direction. It is connected to the portion 36 and connected to the other side portion 47 of the in-turn connecting conductor 41 on the other side in the axial direction. On the other hand, among the pair of side conductors 21 indicated by a solid line, the rightmost pair of side conductors 21 is connected to the other side portion 37 of the end conductor 31 on one side in the axial direction. In addition, it is connected to one side portion 46 of the in-turn connecting conductor 41 on the other side in the axial direction.

  The pair of side conductors 21 are connected one by one to the first end conductor 31a or the second end conductor 31b on one side in the axial direction and connected in the second turn on the other side in the axial direction. One conductor is connected to each conductor 41b or the first turn connecting conductor 41a. In the example of FIG. 6, for example, among the pair of side conductors 21 indicated by a solid line, the second pair of side conductors 21 from the left has a side on one side in the circumferential direction (left side in FIG. 6). The partial conductor 21 is connected to the second end conductor 31b on one side in the axial direction, and is connected to the first turn internal connecting conductor 41a on the other side in the axial direction. On the other hand, the side conductor 21 on the other side in the circumferential direction (the right side in FIG. 6) is connected to the first end conductor 31a on one side in the axial direction and connected to the connection conductor 41b in the second turn on the other side in the axial direction. Has been. Further, for example, among the pair of side conductors 21 shown by a solid line, in the rightmost pair of side conductors 21, the side conductor 21 on one side in the circumferential direction is the second side conductor 21 on the one side in the axial direction. While being connected to the one end conductor 31a, it is connected to the second turn connecting conductor 41b on the other side in the axial direction. On the other hand, the side conductor 21 on the other side in the circumferential direction is connected to the second end conductor 31b on one side in the axial direction, and is connected to the connection conductor 41a in the first turn on the other side in the axial direction. Such a connection structure is sequentially repeated in the circumferential direction. In FIG. 6, only one phase coil 19 is shown, but the same connection structure is adopted for the other two-phase coils 19 indicated by broken lines. The three-phase coil 19 having such a structure is combined to form a distributed winding coil.

In the coil 19 having the above-described structure, on one side in the axial direction, the axial connection portions 34 of the phases that are sequentially repeated in pairs in the circumferential direction are located at different positions in the axial direction along the circumferential direction. Are arranged in steps. In addition, on the other side in the axial direction, the axial connection portions 44 of each phase that are sequentially repeated in pairs in the circumferential direction are also arranged in steps so as to be at different positions in the axial direction along the circumferential direction. At this time, the other side portion 37 of the end conductor 31 and the one side portion 46 of the in-turn connection conductor 41 and the one side portion 36 of the end conductor 31 and the other side portion 47 of the in-turn connection conductor 41 are respectively Since they are arranged so as to overlap with each other when viewed from the axial direction, a portion where the axial distance between the axial connecting portions 34 and 44 is wide and a narrow portion appear sequentially at predetermined intervals in the circumferential direction. Correspondingly, the side conductors 21 that are sequentially repeated in the circumferential direction in a set of two are also repeatedly arranged in the circumferential direction in which the axial length is long and short. The difference between the lengths in the axial direction is a width determined in accordance with the offset amount L of the stepped portion 35 of the end conductor 31 and the stepped portion 45 of the in-turn connecting conductor 41. That is, the width is substantially equal to the thickness (2t) of the two thin plate conductors, which is the sum of the thickness t of the end conductor 31 and the thickness t of the connection conductor 41 in each turn.
The end conductor 31 on one side in the axial direction and the in-turn conductor 41 of the end conductor on the other side in the axial direction connected to the respective side conductors 21 arranged at the same position in the radial direction are the same. It can be a shape. Therefore, the structure can be simplified and the cost can be reduced.

3-3-2. Inter-turn connecting conductor The inter-turn connecting conductor 51 is made of a conductor made of a plate-like member having a rectangular cross-sectional shape in a plane orthogonal to the circumferential direction. The material constituting the inter-turn connection conductor 51 can be, for example, copper or aluminum. The inter-turn connection conductor 51 is formed in a thin plate shape substantially parallel to the axial end surface 11a of the stator core 11 as a whole (see FIG. 13). Further, the inter-turn connecting conductor 51 has a stepped portion 55 in the axial direction at a predetermined position in the circumferential direction, in the present embodiment, in the central portion in the circumferential direction. And the one side part 56 of the circumferential direction one side rather than the said level | step-difference part 55 is offset by the axial direction outer side with respect to the other side part 57 of the circumferential direction other side. That is, the inter-turn connection conductor 51 is offset by the step portion 55 so that the axial distance from the axial end surface 11 a of the stator core 11 is longer in the one side portion 56 than in the other side portion 57. In the present embodiment, the offset amount L by the step portion 55 is set to a value substantially equal to the plate thickness t of the thin plate-like conductor constituting the inter-turn connecting conductor 51. The plate thickness t is substantially equal to the plate thickness t of the end conductor 31 and the in-turn connection conductor 41.

  In the present embodiment, the inter-turn connection conductor 51 includes a circumferential conductor portion 52 that extends in the circumferential direction along the stator core 11, and a radially inner side that is bent radially at both circumferential ends of the circumferential conductor portion 52. And a radial conductor portion 53 extending in the direction. The circumferential conductor portion 52 is a conductor portion that occupies most of the inter-turn connection conductor 51, and the step portion 55 is provided in the circumferential center portion thereof. An axial connection portion 54 connected to the side conductor 21 is formed at the radially inner end of the radial conductor portion 53. In this embodiment, the axial direction connection part 54 is made into the shape opened to the end surface of the axial direction both sides and radial direction inner side of the connection conductor 51 between turns. The opening of the axial connection portion 54 has a substantially rectangular shape when viewed from the axial direction, corresponding to the cross-sectional shape of the axial protrusion 22, and functions as a connection portion of the inter-turn connection conductor 51. The surface of the inter-turn connection conductor 51 is covered with an insulating film made of resin or the like except for the axial connection portion 54. In this way, the axial protrusions 22 of the side conductors 21 formed with complementary shapes corresponding to each other and the axial connection parts 54 of the inter-turn connection conductors 51 can be fitted from the axial direction. Has been.

  Further, in the present embodiment, two sets of two side conductors 21 arranged adjacent to each other in the circumferential direction constituting the in-phase coil 19 are set as one set, and a total of four sets arranged adjacent to each other in the circumferential direction. The side conductors 21 of the same phase are connected in the circumferential direction by an inter-turn connection conductor 51. More specifically, of the two sets of four in-phase side conductors 21, two side conductors 21 that are separated by 5 slots on the inner side in the circumferential direction are surrounded by the first turn connecting conductor 51a. The two side conductors 21 connected in the direction and separated by 7 slots on the outer side in the circumferential direction are connected in the circumferential direction by the second inter-turn connecting conductor 51b. The circumferential conductor 52 in the first inter-turn connecting conductor 51a is disposed radially inward with respect to the circumferential conductor 52 in the second inter-turn connecting conductor 51b.

  In the inter-turn connecting conductor 51 of each phase, the radial length of the radial conductor 53 extending radially from both ends of the circumferential conductor 52 is such that the radial conductor 53 on one circumferential side is the other in the circumferential direction. It is longer than the radial conductor portion 53 on the side by a length corresponding to the radial width of the linear conductor constituting the side conductor 21. As a result, the inter-turn connecting conductor 51 is connected to any one of the in-phase side conductors 21 arranged in the slot 12 from the outside in the radial direction (k is all natural numbers of 1 or more and less than 6), and (k + 1). Any one of the in-phase side conductors 21 arranged in the first position can be connected. Three such inter-turn connection conductors 51 are provided for each phase, one for each phase.

3-3-3. Neutral conductor The neutral conductor 61 is formed of a conductor made of a plate-like member having a rectangular cross-sectional shape in a plane orthogonal to the circumferential direction. The material constituting the neutral conductor 61 can be, for example, copper or aluminum. As shown in FIG. 3, the neutral conductor 61 is formed in a thin plate shape substantially parallel to the axial end surface 11 a of the stator core 11 as a whole. Moreover, the neutral conductor 61 has the level | step-difference part 65 of the axial direction in the circumferential direction several places (4 places in this example). And the part offset to the axial direction outer side by the said level | step-difference part 65 is arrange | positioned in the state which overlaps with the other side part 47 of the connection conductors 41u and 41w of the 6th layer in the 6th layer in U phase and W phase. . In the present embodiment, the offset amount L by the step portion 65 is set to a value substantially equal to the plate thickness t of the thin plate-like conductor that forms the neutral conductor 61. The plate thickness t is substantially equal to the plate thickness t of the end conductor 31 and the in-turn connecting conductor 41 in the sixth turn.

  In the present embodiment, the neutral conductor 61 extends inward in the radial direction at the circumferential conductor portion 62 that extends in the circumferential direction along the stator core 11 and at both circumferential ends and the circumferential center of the circumferential conductor portion 62. And three radial conductor portions 63. The circumferential conductor 62 is a conductor that occupies most of the neutral conductor 61. An axial connection portion 64 connected to the side conductor 21 is formed at the radially inner end of the radial conductor portion 63. In this embodiment, the axial direction connection part 64 is made into the shape opened to the end surface of the axial direction both sides of a neutral conductor 61, and radial inside. The opening of the axial connection portion 64 has a substantially rectangular shape corresponding to the cross-sectional shape of the axial protrusion 22 when viewed from the axial direction, and functions as a connection portion of the neutral conductor 61. The surface of the neutral body 61 is covered with an insulating coating made of resin or the like except for the axial connection portion 64. In this way, the axial protrusion 22 of the side conductor 21 and the axial connection portion 64 of the neutral conductor 61 formed to have complementary shapes corresponding to each other can be fitted from the axial direction. ing.

  Then, a set of two side conductors 21 for each phase is connected to a pair of axial connection portions 64 provided on each of the three radial conductor portions 63. Thereby, the coils 19u, 19v, and 19w of each phase are connected by Y connection.

4). Next, a method for manufacturing the stator 2 according to this embodiment will be described. The stator 2 according to the present embodiment can be manufactured through an insulating sheet insertion step S1, an in-turn connection step S2, an inter-turn connection step S3, and a neutral point connection step S4 in each turn. Note that the intra-turn connection step S2 and the inter-turn connection step S3 in each turn are repeatedly performed as appropriate in accordance with the number of turns. As shown in FIG. 8 showing the assembly procedure of the stator 2, in the in-turn connecting step S2, more specifically, the side conductor inserting step S2a, the other side coil end connecting step S2b, and the one side coil end connecting Step S2c is performed.

  Here, among the procedures P1 to P15, P1 corresponds to the insulating sheet insertion step S1. P2, P5, and P11 correspond to the side conductor insertion step S2a. Further, P3, P7 and P13 correspond to the other coil end connection step S2b. P4, P8, and P14 correspond to the one-side coil end connecting step S2c. P6 and P12 correspond to the inter-turn connection step S3. P15 corresponds to the neutral point connection step S4. Below, with reference to FIGS. 9-20, the assembly | attachment procedure of the stator 2 is demonstrated along each procedure P1-P15. It should be noted that the detailed description of points such as the connection structure between the side conductor 21 and the end conductor 31 that have already been described in detail will be omitted.

  First, as shown in FIG. 9, an insulating sheet 18 is inserted in each slot 12 of the stator core 11 in the axial direction (P1), and then a plurality of (in this example, the slot 12 in the first turn of the coil 19). 48 side conductors 21 are inserted in the axial direction (P2). The radial position in the slot 12 at this time is on the outermost periphery side. A pair of side conductors 21 having a longer axial length is inserted into two adjacent slots 12, and each of the shorter axial lengths is inserted into two adjacent slots 12. A pair of side conductors 21 is inserted. This is repeated over the entire circumference. Thereby, a set of two side conductors 21 having a longer axial length and a set of two side conductors 21 having a shorter axial length are alternately arranged in the circumferential direction.

  Next, as shown in FIG. 10, the terminal conductor 71 of each phase is connected to a predetermined pair of side conductors 21 on the other side in the axial direction. At this time, the V-phase terminal conductor 71v is connected to the pair of side conductors 21 with an interval of 6 slots on one side in the circumferential direction with respect to the U-phase terminal conductor 71u. The W-phase terminal conductor 71w is connected to the pair of side conductors 21 with an interval of 6 slots on one side in the circumferential direction with respect to the V-phase terminal conductor 71v. The side conductor 21 and the terminal conductor 71 of each phase are connected when the axial protrusion 22 of the side conductor 21 and the axial connection portion (not shown) of the terminal conductor 71 are fitted in the axial direction. Is done. The connected side conductor 21 and the terminal conductor 71 of each phase are joined by resistance brazing, friction stir welding, welding, or the like (the same applies hereinafter). After that, a set of two side conductors 21 arranged at intervals of four slots on the other side in the circumferential direction with respect to the set of two side conductors 21 connected to the terminal conductor 71 of each phase. Are connected to the other-side coil end unit U2, one U-phase in-turn connection conductor 41u, and one W-phase in-turn connection conductor 41w (P3).

  Next, as shown in FIG. 11, end conductors 31 are connected to the side conductors 21 on one side in the axial direction. At this time, the end conductors 31 are axially connected to the side conductors 21 in a state in which the one-side coil end unit U1 arranged and integrated in the circumferential direction is formed (see FIG. 7). ). In this way, the productivity can be improved by connecting the side conductors 21 and the end conductors 31 in the state of the one-side coil end unit U1.

  In the present embodiment, each end conductor 31 is made of a thin plate-like conductor having an axial step 35 at the center in the circumferential direction, and the one side portion 36 and the other side between the end conductors 31 adjacent to each other. An annular one-side coil end unit U1 is formed by being arranged in the circumferential direction so as to overlap the portion 37 in the axial direction. In such a case, inevitably, at least one of the plurality of end conductors 31 forming the one-side coil end unit U1 is connected to the other side portion 37 of the end conductor 31 adjacent to one side in the circumferential direction. It is necessary to be inserted in a radial direction into a space between the one end portion 36 of the end conductor 31 adjacent to the other side in the direction.

Therefore, for example, among the plurality of end conductors 31 forming the one-side coil end unit U1, the U-phase end conductor 31u is connected to the other side portion 37 of the W-phase end conductor 31w adjacent to one side in the circumferential direction. Consider a case in which the V-phase end conductor 31v adjacent to the other side in the circumferential direction is inserted in the space between the one side portion 36 in the radial direction. Then, in such a case, in the state where the two end conductors 31v and 31w on both sides in the circumferential direction are connected to the corresponding side conductors 21, the axis corresponding to the plate thickness t of the thin plate conductor between them. It can be seen that it is very difficult to insert the U-phase end conductor 31u in the radial direction into the minute space having the directional distance and connect it to the side conductor 21.
On the other hand, according to the method for manufacturing the stator 2 according to the present embodiment, the one-side coil end unit U1 in which the plurality of end conductors 31 on one axial side are integrated in advance over the entire circumferential direction. With the formed state, all the end conductors 31 forming the one-side coil end unit U1 can be connected to the corresponding side conductors 21 in the axial direction. It is excellent in nature.

  Next, as shown in FIG. 12, the plurality of side conductors 21 constituting the second turn of the coil 19 are inserted into the slots 12 in the axial direction (P5). At this time, the inserted side conductor 21 is longer in the axial direction than the side conductor 21 constituting the first turn of the coil 19 and is arranged adjacent to the radially inner side. Next, as shown in FIG. 13, on the other side in the axial direction, among the side conductors 21 constituting the first turn of the coil 19 of each phase, the other side coil end unit U2, one U-phase in-turn connection A set of two side conductors 21 that are not connected to any of the conductor 41u and one W-phase in-turn connection conductor 41w (with respect to a set of two side conductors 21 connected to the terminal conductor 71) Thus, the terminal conductor 71 of each phase is connected among the pair of side conductors 21) arranged at intervals of 4 slots on the other side in the circumferential direction and the side conductor 21 constituting the second turn. The set of two side conductors 21 arranged in the same slot 12 as the side conductors 21 are connected by the inter-turn connection conductor 51 (P6). Thereby, the first turn and the second turn of the coil 19 are appropriately connected.

  Next, as shown in FIG. 14, a set of two pieces arranged in the same slot 12 as the pair of side conductors 21 connected to the inter-turn connection conductor 51 of each phase on the other side in the circumferential direction. Side conductors 21 other than the three pairs of side conductors 21 are connected to the other coil end unit U2, one U-phase in-turn connection conductor 41u, and one W-phase in-turn connection conductor 41w ( P7). At this time, the other coil end unit U2, which constitutes the second turn of the coil 19, one U-phase in-turn connecting conductor 41u, and one W-phase in-turn connecting conductor 41w are the other constituting the first turn. The side coil end unit U2, the one U-phase in-turn connecting conductor 41u, and the one W-phase in-turn connecting conductor 41w are stacked on the outside in the axial direction.

Next, as shown in FIG. 15, the side conductors 21 and the one-side coil end unit U1 are connected on one side in the axial direction (P8). At this time, the one-side coil end unit U1 constituting the second turn of the coil 19 is disposed so as to be laminated on the outer side in the axial direction with respect to the one-side coil end unit U1 constituting the first turn.
The above procedure is sequentially repeated until the fifth turn of the coil 19 is performed.

  Next, as shown in FIG. 16, the plurality of side conductors 21 constituting the sixth turn of the coil 19 are inserted into the slots 12 in the axial direction (P11). At this time, the inserted side conductor 21 is longer in the axial direction than the side conductor 21 constituting the fifth turn of the coil 19, and is the longest in the axial direction among the side conductors 21 constituting each turn. Is getting longer. Moreover, it arrange | positions adjacent to the radial direction inner side of the side conductor 21 which comprises the 5th turn of the coil 19, and is arrange | positioned in the innermost periphery side in the slot 12 in the side conductor 21 which comprises each turn. .

  Next, as shown in FIG. 17, on the other side in the axial direction, among the side conductors 21 constituting the fifth turn of the coil 19 of each phase, the other coil end unit U2 and one U-phase in-turn connection A set of two side conductors 21 that are not connected to any of the conductor 41u and one W-phase in-turn connection conductor 41w (with respect to a set of two side conductors 21 connected to the terminal conductor 71) Thus, the terminal conductor 71 of each phase is connected among the pair of side conductors 21) arranged at intervals of 4 slots on the other side in the circumferential direction and the side conductor 21 constituting the sixth turn. The pair of side conductors 21 arranged in the same slot 12 as the side conductors 21 thus connected are connected by an inter-turn connection conductor 51 (P12). Thereby, the 5th turn and the 6th turn of the coil 19 are appropriately connected.

  Next, as shown in FIG. 18, a set of two pieces arranged in the same slot 12 as the pair of side conductors 21 connected to the inter-turn connection conductor 51 of each phase on the other circumferential side. Side conductors 21 other than the three pairs of side conductors 21 are connected to the other coil end unit U2, one U-phase in-turn connection conductor 41u, and one W-phase in-turn connection conductor 41w ( P13). At this time, the other coil end unit U2 constituting the sixth turn of the coil 19, one U-phase in-turn connecting conductor 41u, and one W-phase in-turn connecting conductor 41w are the other constituting the fifth turn. The side coil end unit U2, the one U-phase in-turn connecting conductor 41u, and the one W-phase in-turn connecting conductor 41w are disposed so as to be laminated on the outside in the axial direction, and all the other coil end units U2, Of the one U-phase in-turn connecting conductor 41u and the one W-phase in-turn connecting conductor 41w, they are arranged on the outermost side in the axial direction.

  Next, as shown in FIG. 19, the side conductors 21 and the one-side coil end unit U1 are connected on one side in the axial direction (P14). At this time, the one-side coil end unit U1 constituting the sixth turn of the coil 19 is disposed so as to be laminated on the outer side in the axial direction with respect to the one-side coil end unit U1 constituting the fifth turn. It is arranged on the outermost side in the axial direction in the end unit U1.

  Finally, as shown in FIG. 20, on the other side in the axial direction, of the side conductors 21 constituting the sixth turn of the coil 19 of each phase, the other side coil end unit U2, one U-phase in-turn connection Three sets of two side conductors 21 that are not connected to either the conductor 41 u or one W-phase in-turn connecting conductor 41 w are connected by a neutral conductor 61.

  In the stator 2 manufactured in this way, the plurality of end conductors 31 on at least one axial side of the stator core 11 are formed of thin plate-like conductors having an axial step 35 at the center in the circumferential direction, and these are adjacent to each other. Since the one side portion 36 and the other side portion 37 are arranged in the circumferential direction between the end conductors 31 to be overlapped in the axial direction, the axial length can be kept short on the one axial side. The plurality of in-turn connection conductors 41, the inter-turn connection conductors 51, and the neutral conductors 61 on the other side in the axial direction are made of thin plate conductors having axial step portions 45, 55, 65 at predetermined positions in the circumferential direction, respectively. Since these are arranged in the circumferential direction with the one side portion and the other side portion overlapping in the axial direction between the conductors adjacent to each other, the axial length can also be kept short on the other side in the axial direction. . Therefore, the axial length can be kept short on both sides in the axial direction, and the entire stator 2 can be configured compactly. Further, on the one side in the axial direction, the plurality of end conductors 31 can be assembled to the side conductor 21 in a state where an annular one side coil end unit U1 is formed that is integrated over the entire circumferential direction. Manufacturability is good. Therefore, the stator 2 according to the present embodiment can be configured compactly as a whole and has excellent manufacturability.

[Second Embodiment]
A second embodiment of an armature for a rotating electrical machine according to the present invention will be described with reference to the drawings. Also in this embodiment, the armature for rotating electrical machines according to the present invention is applied to the stator 2 of the inner rotor type rotating electrical machine 1. However, in the present embodiment, the shapes of the teeth 15 and the slots 12 of the stator core 11 constituting the stator 2 are different from those of the first embodiment. Accordingly, the shape of the side conductor 21 is also different from that of the first embodiment. Hereinafter, the stator 2 according to the present embodiment will be described mainly focusing on the differences from the first embodiment. Note that points not particularly specified are the same as in the first embodiment.

  As shown in FIG. 21, between the adjacent slots 12 of the stator core 11, teeth 15 extending in the axial direction are provided. The teeth 15 are provided with circumferential wall portions 17 extending in the axial direction and the radial direction on both sides in the circumferential direction. A space between two circumferential wall portions 17 that are circumferentially opposed between the adjacent teeth 15 is a slot 12. In this embodiment, the circumferential direction wall part 17 of the circumferential direction both sides in each tooth | gear 15 is formed in parallel mutually. Thus, by making the teeth 15 parallel type teeth, the cross-sectional area of the surface orthogonal to the radial direction in each tooth 15 can be made substantially equal over the entire radial direction. Therefore, the magnitude of the magnetic flux density of the magnetic field generated by the permanent magnet or the like provided in the rotor 3 as a field passing through each tooth can be made substantially uniform in the radial direction. Thus, in the rotating electrical machine 1 according to the present embodiment, by using parallel teeth, the maximum magnetic flux density until magnetic saturation occurs in each tooth 15 is increased, and energy efficiency is improved.

  By the way, when the teeth 15 are parallel teeth as described above, a cross section perpendicular to the axial direction of the slot 12 formed between the two circumferential wall portions 17 facing each other in the circumferential direction between the adjacent teeth 15. The cross-sectional shape at is substantially trapezoidal. Here, the circumferential width W3 on the innermost circumferential side in the slot interior 13 has a substantially trapezoidal shape that is narrower than the circumferential width W5 on the outermost circumferential side. In the present embodiment, a plurality of side conductors 21 (six in this example) arranged in the radial direction in each slot 12 in accordance with such a slot shape are arranged on the radially outer side. It is formed so that the circumferential direction width | variety becomes so wide that the thing. Thereby, the space | gap part in the slot 12 is reduced and the space factor of the coil 19 is improved.

  Further, the side conductor 21 is formed so that the radial width becomes narrower as it is arranged on the outer side in the radial direction. Thereby, since the radial direction width | variety of the whole coil 19 can be narrowed, the internal diameter of the stator core 11 can be enlarged. Therefore, since the diameter of the rotor 3 of the rotating electrical machine 1 can be increased, the output of the rotating electrical machine 1 can be improved. Furthermore, in the present embodiment, the circumferential width and the radial width of all the six side conductors 21 arranged in the radial direction so that the cross-sectional areas of the surfaces orthogonal to the axial direction are substantially equal. Is set. Thereby, when a current is passed through the coil 19, the cross-sectional areas in the energizing direction are substantially equal for all the side conductors 21, so that the electric resistance value is made substantially constant and the amount of heat generated by Joule heat in the coil 19 is local. The occurrence of inconveniences such as an increase in the amount is suppressed.

  In the stator 2 according to the present embodiment, the coil 19 can be divided into a plurality of side conductors 21 and a plurality of end conductors 31. Therefore, the circumferential width and the radial width of the side conductor 21 can be easily changed as appropriate according to the radial position in the slot 12. Even in that case, by making the shape of the axial protrusions 22 on both sides in the axial direction of each side conductor 21 the same as in the first embodiment, the side conductor 21, the end conductor 31, the turn The connection structure among the inner connection conductor 41, the inter-turn connection conductor 51, the neutral conductor 61, and the terminal conductor 71 can be the same as that in the first embodiment. Therefore, in the configuration of the present embodiment, it is possible to easily manufacture the stator 2 that can be configured compactly as a whole, has excellent manufacturability, and can further improve the output and energy efficiency of the rotating electrical machine 1. It has become.

[Third embodiment]
A third embodiment of the armature for a rotating electrical machine according to the present invention will be described with reference to the drawings. Also in this embodiment, the armature for rotating electrical machines according to the present invention is applied to the stator 2 of the inner rotor type rotating electrical machine 1. However, in the present embodiment, the shape of the conductor constituting the coil 19 is partially different from that in the first embodiment. Hereinafter, the stator 2 according to the present embodiment will be described mainly focusing on the differences from the first embodiment. Note that points not particularly specified are the same as in the first embodiment.

  In the present embodiment, as shown in FIG. 22, the coil 19 includes a plurality of U-shaped conductors 81 that are substantially U-shaped when viewed from the radial direction, and a plurality of end conductors 31. Yes. Here, each U-shaped conductor 81 has a circumferential portion on the other side in the axial direction of the stator core 11 between the side portion 83 arranged in the slot interior 14 of the slot 12 and the side portion 83 arranged in a different slot 12. And a connection end 84 to be connected. The U-shaped conductor 81 corresponds to the one in which the in-turn connecting conductor 41 and the two side conductors 21 connected thereto are integrally formed in the first embodiment. However, in the U-shaped conductor 81 according to the present embodiment, the connection end portion 84 which is a conductor portion corresponding to the in-turn connection conductor 41 in the first embodiment also has a rectangular cross-sectional shape like the side portion 83. It is comprised by the linear conductor.

  On one side in the axial direction of the side portion 83 of the U-shaped conductor 81, an axial protrusion portion 82 is formed that protrudes further outward in the axial direction with respect to the central portion of the side portion 83. The axial projection 82 has a substantially rectangular cross-sectional shape in a plane orthogonal to the axial direction, and functions as a connection portion of the U-shaped conductor 81. The surface of the U-shaped conductor 81 is covered with an insulating film made of resin or the like except for the axial protrusions 82. And each end part conductor 31 is the state which formed the one side coil end unit U1 integrated in cyclic | annular form, the axial direction connection part 34 fits into the axial direction projection part 82 in an axial direction, and each side part Connected to the conductor 21.

  In the present embodiment, as shown in FIG. 23, each end conductor 31 forms a one-side coil end unit U1 in a state of being arranged radially inward with respect to the side portion 83 of the U-shaped conductor 81. The axial connection portion 34 and the axial projection 82 are fitted in the axial direction and connected to the side conductors 21. In the present embodiment, the inner side in the radial direction is “one side in the radial direction”, and the outer side in the radial direction is “the other side in the radial direction”. Accordingly, in the present embodiment, among the U-shaped conductors 81, a plurality of side portions 83 arranged in the radial direction in each slot 12 are arranged in the stator core from the radially inner side toward the radially outer side. 11 are arranged so that the protruding height H from the axial end surface 11a is sequentially increased. That is, the protruding height H from the axial end surface 11a of the stator core 11 at the side portions 83 of the plurality of U-shaped conductors 81 is directed from the outermost side portion 83 to the innermost side portion 83 in the radial direction. Are set to increase sequentially. In this embodiment, by adopting such a configuration, it is possible to reduce the absolute amount of the material constituting the end conductor 31 when the radial positions where the side portions 83 are arranged are the same. Thus, the manufacturing cost is reduced. In this case, when the stator 2 is assembled, the U-shaped conductor 81 is sequentially inserted from the radially inner side to the radially outer side in each slot 12 as the number of turns increases.

  Further, in the present embodiment, since the other side in the axial direction is already connected by the U-shaped conductor 81, when the stator 2 is assembled, the other-side coil end connecting step S2b is omitted. In addition, the U-shaped conductor 81 having a shape in which the side portion 83 on one side in the circumferential direction is offset radially inward by one radial portion with respect to the side portion 83 on the other side in the circumferential direction is connected to the other side in the axial direction. By inserting in the axial direction from the side toward one side in the axial direction, the U-shaped conductor insertion step S2a ′ corresponding to the side conductor insertion step S2a and the inter-turn connection step S3 can be performed simultaneously. As described above, in the stator 2 according to the present embodiment, the number of manufacturing steps is reduced as compared with the stator 2 in the first embodiment, so that the manufacturability is further improved. In particular, on the other side in the axial direction, since the joining portion can be only between the side conductor 21 and the terminal conductor 71 of each phase and between the side conductor 21 and the neutral conductor 61, Thus, the number of joints on the other side in the axial direction can be eliminated, and the number of joints in the entire stator 2 can be halved. Also from this point, the stator 2 according to the present embodiment is very excellent in manufacturability and has high production efficiency.

[Other Embodiments]
(1) In each of the above embodiments, the offset amount L due to the step portions 35, 45, 55 is set to a value substantially equal to the thickness t of the thin plate conductors constituting the end conductors 31, 41, 51. The case has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, with the aim of maintaining high electrical insulation between the coils 19 of each phase, one of the thickness of the insulating coating on the end conductors 31 and the like and the thickness of the mold resin on both sides in the axial direction Alternatively, it is also one of preferred embodiments of the present invention that both are made relatively thick so that the offset amount L is slightly larger than the plate thickness t of the thin plate conductor.

(2) In each of the above-described embodiments, the side conductor 21 is provided with the axial protrusion 22 having a substantially rectangular cross-sectional shape in the plane orthogonal to the axial direction, and the end conductor 31 is provided with the end conductor 31. An axial connection portion 34 having a shape opened from both axial sides and radially inner end faces is provided, the shape seen from the axial direction being formed in a substantially rectangular shape corresponding to the cross-sectional shape of the axial projection 22. An example has been described. However, the embodiment of the present invention is not limited to this. That is, it is only necessary that the connection portion of the end conductor 31 has a structure that can be fitted to the connection portion of the side conductor 21 from the axial direction. For example, the axial connection portion 34 is in the radial direction of the end conductor 31. It is also one preferred embodiment of the present invention to have a configuration in which holes are not opened on the inner end face but are opened only on the end faces on both sides in the axial direction. In addition, it is also a preferred embodiment of the present invention that the shapes of the axial protrusions 22 and the axial connection portions 34 are formed to have a circular cross section. Alternatively, for example, an axial recess that is recessed in the axial direction is provided at both ends in the axial direction of the side conductor 21, and an axial protrusion that can be fitted to the axial recess from the axial direction is an end. A configuration in which the conductor 31 is provided is also one preferred embodiment of the present invention. The same applies to the in-turn connecting conductor 41, the inter-turn connecting conductor 51, the neutral conductor 61, and the terminal conductor 71.

(3) In the first embodiment, the plurality of side conductors 21 that are arranged in the radial direction in each slot 12 are end faces in the axial direction of the stator core 11 from the radially outer side toward the radially inner side. The case where the protrusion height H from 11a is arranged so as to increase sequentially has been described as an example. Further, in the third embodiment, among the U-shaped conductors 81, a plurality of side portions 83 arranged in the radial direction in the respective slots 12 are arranged from the radially inner side toward the radially outer side. The case where the height H of the stator core 11 protruding from the axial end surface 11a is sequentially increased has been described as an example. However, the embodiment of the present invention is not limited to this. That is, in the configuration in which the side conductor 21 arranged in the slot 12 is connected by the in-turn connecting conductor 41, the inter-turn connecting conductor 51 and the like on the other side in the axial direction as in the first embodiment, A plurality of side conductors 21 arranged side by side in the radial direction in the slot 12 are arranged such that the protruding height H from the axial end surface 11a of the stator core 11 increases sequentially from the radial inner side to the radial outer side. It is one of the preferred embodiments of the present invention to have a configured configuration. In this case, the end conductors 31 are arranged radially inward with respect to the side conductors 21, and the axial connection portions 34 and the axial projections 22 are fitted in the axial direction so that the side portions Connected to the conductor 21. When the coil 19 is configured using the U-shaped conductor 81 as in the third embodiment, a plurality of U-shaped conductors 81 are arranged in the radial direction in each slot 12. It is also preferable that the side portion 83 is arranged such that the protruding height H from the axial end surface 11a of the stator core 11 increases sequentially from the radially outer side to the radially inner side. This is one of the embodiments. In this case, the end conductors 31 are arranged on the radially outer side with respect to the side portions 83, and the axial connection portions 34 and the axial projections 82 are fitted in the axial direction so that each U-shaped Connected to the conductor 81.

(4) In each of the embodiments described above, as an example, each of the slots 12 has six side conductors 21 constituting the coil 19 arranged in the radial direction to form a six-layer coil. explained. However, the embodiment of the present invention is not limited to this. That is, it is one of the preferred embodiments of the present invention to appropriately change the number of the side conductors 21 arranged in the radial direction to form an n-layer coil. The stator 2 having such an n-layer coil is obtained by repeating the in-turn connection step S2 and the inter-turn connection step S3 in each turn in the assembly procedure of the stator 2 described with reference to FIGS. By appropriately changing, it can be appropriately manufactured.

(5) In the above embodiments, the case where the slot 12 of the stator core 11 is a semi-open slot has been described as an example. However, the embodiment of the present invention is not limited to this. That is, a configuration in which the circumferential width W1 of the inner circumferential opening 13 in each slot 12 is equal to the circumferential width W3 of the slot interior 14 is a so-called open slot. It is.

(6) In each of the above-described embodiments, the case where the side conductor 21 is configured by a linear conductor having a rectangular cross-sectional shape in a plane orthogonal to the axial direction has been described. However, the embodiment of the present invention is not limited to this. That is, an arbitrary shape can be adopted as the cross-sectional shape in the plane orthogonal to the axial direction of the side conductor 21. In this case, when the cross-sectional shape in the cross section orthogonal to the axial direction of the slot 12 is substantially trapezoidal as in the second embodiment, the cross-sectional shape of the side conductor 21 is also substantially corresponding to this. A trapezoidal shape is preferable. That is, in such a configuration, the space portion of the coil 19 can be improved by greatly reducing the gap portion in the slot 12. Therefore, the output of the rotating electrical machine 1 can be improved. In the present invention, since the coil 19 can be divided into a plurality of side conductors 21 and a plurality of end conductors 31, the coil 19 can be formed even if the cross-sectional shape of the side conductor 21 is substantially trapezoidal. It is easy to configure properly.

(7) In each of the above-described embodiments, a case has been described in which the plurality of end conductors 31 on one side in the axial direction form the one-side coil end unit U1 arranged in the circumferential direction and integrated. . In the one-side coil end connecting step S2c, the side conductors 21 and the one-side coil end unit U1 are connected on one side in the axial direction in a state where such one-side coil end unit U1 is formed. The case has been described as an example. However, the embodiment of the present invention is not limited to this. That is, at least the end conductors 31 that are adjacent to each other need only be arranged in the circumferential direction with the one side portion 36 and the other side portion 37 overlapping in the axial direction between them, and the plurality of end conductors 31 are provided. It is one of the preferred embodiments of the present invention to have a configuration in which they are arranged in the circumferential direction in an independent state. Further, in the one-side coil end connection step S2c, it is also one of preferred embodiments of the present invention that the twelve end conductors 31 are individually connected to the side conductors 21. For example, the U-phase end conductor 31u, the V-phase end conductor 31v, and the W-phase end conductor 31w are sequentially connected to the side conductor 21 in the axial direction from one circumferential side to the other circumferential side. (See FIG. 15). In this case, only the end conductor 31 connected lastly has a diameter in a minute space formed between the two end conductors 31 on both sides in the circumferential direction connected to the corresponding side conductors 21. It is inserted in the direction and connected to the side conductor 21.

(8) In each of the above embodiments, the plurality of end conductors 31 are integrated by a resin mold in a state where the surfaces on both sides in the axial direction are covered with a resin, thereby constituting the one-side coil end unit U1. An example has been described. However, the embodiment of the present invention is not limited to this. That is, it is sufficient that at least electrical insulation between different phases is ensured. For example, the plurality of end conductors 31 are in a state in which one of the surfaces on one side in the axial direction and the other side in the axial direction is coated with resin. It is also one of the preferred embodiments of the present invention that the one-side coil end unit U1 is integrated by a resin mold. The same applies to the other coil end unit U2 formed by combining a plurality of in-turn connecting conductors 41.
Further, in these cases, the one-side coil end unit U1 integrated by the resin mold has a plurality of radially projecting portions 91 projecting radially outward as evenly distributed in the circumferential direction as shown in FIG. In one of the preferred embodiments of the present invention, it is also possible to provide a structure in which the insertion holes 92 are formed in each of the radial protrusions 91 so as to open on both sides in the axial direction. is there. The same applies to the other coil end unit U2. In such a configuration, a fastening member such as a bolt is inserted in the insertion hole 92 formed in the radial protrusion 91 in the axial direction, and the one side coil end unit U1 and the other side coil end unit U2 are fixed to the stator core 11. It becomes easy to integrate. Alternatively, a fastening member such as a bolt is inserted in the insertion hole 92 formed in the radial protrusion 91 in the axial direction, and the one side coil end unit U1, the other side coil end unit U2, and the stator core 11 are further rotated, for example. It can also be fixed and integrated with the case 5 (see FIG. 1) of the electric machine 1 or the like.

(9) In each of the above-described embodiments, the case where the plurality of end conductors 31 are integrated by a resin mold to constitute the one-side coil end unit U1 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, the end conductors 31 of different phases may be integrated with a double-sided adhesive tape or the like with an insulating paper having electrical insulation interposed therebetween to form the one-side coil end unit U1. It is one of the preferred embodiments of the invention. The same applies to the other coil end unit U2 formed by combining a plurality of in-turn connecting conductors 41.

(10) In the first and second embodiments, a part of the nine in-turn connection conductors 41 (more specifically, one U-phase in-turn connection conductor 41u and one W-phase connection conductor 41u). The case where the seven turn internal connection conductors 41) excluding the internal connection conductor 41w form the other coil end unit U2 arranged in the circumferential direction and integrated is described as an example. Further, in the other side coil end connecting step S2b (P3, P7, P13), an example is shown in which the seven turn-inside connecting conductors 41 are connected to the side conductors 21 with the other side coil end unit U2 formed. As explained. However, the embodiment of the present invention is not limited to this. That is, it is also one preferred embodiment of the present invention that the seven turn connecting conductors 41 are individually connected to the side conductors 21. For example, the side conductor 21 and the shaft are sequentially arranged in the order of the V-phase in-turn connecting conductor 41v, the U-phase in-turn connecting conductor 41u, and the W-phase in-turn connecting conductor 41w from the other circumferential side to the one circumferential side. It can be set as the structure connected to a direction (refer FIG. 10). On the other side in the axial direction, the in-turn connecting conductor 41 and the inter-turn connecting conductor 51 are connected in separate steps, and unlike the one side coil end unit U1, the other side coil end unit U2 is integrated over the entire circumference. This is because the connection conductors 41 in each turn and the side conductors 21 can be connected in the axial direction without difficulty even if the above connection method is adopted.

(11) In each of the above embodiments, the case where the armature for a rotating electrical machine according to the present invention is applied to the stator 2 of the inner rotor type rotating electrical machine 1 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, as shown in FIG. 25, application to the stator 2 of the outer rotor type rotating electrical machine 1 is also a preferred embodiment of the present invention. Of course, even in this case, in each of the above-described embodiments, it is possible to incorporate some additional techniques described as examples of suitable configurations.

  INDUSTRIAL APPLICABILITY The present invention is suitable for an armature for a rotating electrical machine having a cylindrical core in which a plurality of slots extending in the axial direction are distributed in the circumferential direction, and a plurality of coils wound around the slots in a distributed winding manner. Can be used.

1 Rotating electrical machine 2 Stator (armature)
11 Stator core (core)
11a Axial end face 12 Slot 13 Inner peripheral opening (opening)
14 Slot interior 15 Teeth 16 Circumferential protrusion 17 Circumferential wall 19 Coil 21 Side conductor 22 Axial protrusion 31 End conductor 35 Step portion 36 One side portion 37 Other side portion 41 In-turn connection conductor 45 Step portion 51 Inter-turn connection conductor 55 Stepped portion 61 Neutral conductor 65 Stepped portion 81 U-shaped conductor 91 Radial protruding portion 92 Insertion hole U1 One end coil unit

Claims (7)

A cylindrical core in which a plurality of axially extending slots are distributed in the circumferential direction; and a plurality of coils wound in a distributed winding around the slots;
The coil has a plurality of side conductors arranged in the slot and a plurality of side conductors connecting the side conductors arranged in the different slots in the circumferential direction at both axial ends of the core. And an armature for a rotating electric machine configured to include:
The end conductor on at least one axial side of the core is made of a plate-like member having an axial step at a predetermined position in the circumferential direction, and one side portion on one circumferential side with respect to the step is The shape is located on the outer side in the axial direction with respect to the other side portion on the other side in the circumferential direction,
The rotating electric machine in which the plurality of end conductors on at least one axial side are arranged in the circumferential direction with the one side portion and the other side portion overlapping in the axial direction between the adjacent end conductors. Armature. The end conductor is arranged on one side in the radial direction with respect to the connected side conductor,
A plurality of the side conductors are arranged in a radial direction in each of the slots, and the protruding height from the axial end surface of the core in the side conductor is from the side conductor on one side in the radial direction. It is set to increase sequentially toward the side conductor on the other side in the radial direction,
2. The armature for a rotating electrical machine according to claim 1, wherein the side conductors arranged in different slots and arranged at the same position in the radial direction are connected to the same end conductor.   3. The end conductor is formed such that a radial width is wider and an axial width is narrower as the end conductor is connected to the side conductor disposed on the other radial side in the slot. The armature for rotary electric machines described in 1.   The end conductors are arranged with the radial position of the end on one radial side being aligned, and the axial width is such that the cross-sectional areas of the end conductors are substantially the same according to the radial width. The armature for a rotating electrical machine according to claim 3, wherein is set. In each of the slots, n (n is a natural number of 2 or more) side conductors are disposed,
The end conductors on the other side in the axial direction with respect to the core are each composed of an in-turn connection conductor, an inter-turn connection conductor, and a neutral conductor made of a plate-like member having an axial step at a predetermined position in the circumferential direction. And having the other side in the axial direction,
One of the side conductors arranged kth from the inside or outside in the slot in the radial direction (k is a natural number of 1 or more and less than n), and the side arranged at the (k + 1) th Any one of the conductors is connected by the inter-turn connection conductor forming a coil of each phase,
The side conductors that are not connected to the inter-turn connection conductor are respectively connected by the in-turn connection conductor that forms a coil of each phase,
Among the side conductors arranged nth from the inside or outside in the radial direction in the slot, the coils of each phase that are not connected to either the inter-turn connection conductor or the in-turn connection conductor The armature for rotating electrical machines according to any one of claims 2 to 4, wherein a side conductor is connected to the neutral conductor.   The armature for a rotating electrical machine according to claim 5, wherein the in-turn connecting conductor and the two side conductors connected to the in-turn connecting conductor are formed as an integrally formed U-shaped conductor.   Each of the end conductors has the stepped portion at the center portion in the circumferential direction, and an offset amount by the stepped portion is set to a value substantially equal to a plate thickness of the plate-like member. An armature for a rotating electrical machine according to claim 1.

Images