JPWO2013179477A1 - Rotating electric machine, rotating electric stator and vehicle - Google Patents

Abstract

In this rotating electrical machine (100), the first coil (30), the second coil (40), and the third coil (50) are arranged on the inner side in the radial direction of the stator core at one end of the stator core 1a in the axial direction. While being bent, the first connecting portions (36, 44, 55) of the first coil, the second coil, and the third coil are arranged so as to be shifted in the radial direction.

Description

  The present invention relates to a rotating electrical machine, a stator for a rotating electrical machine, and a vehicle, and particularly to a rotating electrical machine including a coil mounted by concentric winding, a stator for a rotating electrical machine, and a vehicle.

  Conventionally, a rotating electric machine including a coil mounted by concentric winding is known. Such a rotating electrical machine is disclosed in, for example, Japanese Patent Application Laid-Open No. 2010-246342.

  Japanese Unexamined Patent Application Publication No. 2010-246342 discloses a rotating electrical machine including a rotor disposed on the inner peripheral side of a stator and a stator including a plurality of coils. The stator is formed so that both of the coil ends protrude in the axial direction of the stator and the substantially rectangular first coil and both of the coil ends protrude outward in the radial direction of the stator. And a second coil.

JP 2010-246342 A

  However, in the rotating electrical machine disclosed in JP 2010-246342 A, the first coil is formed so as to protrude in the axial direction, and the second coil has both coil ends on the outside in the radial direction of the stator. Since it is formed so as to protrude, even if the first coil and the second coil are inserted into the slot from the coil end side along the axial direction, the coil end collides with the stator core and the coil end cannot be inserted. There is an inconvenience. For this reason, in the rotating electrical machine disclosed in JP 2010-246342 A, it is necessary to insert the coil from the inner side to the outer side in the radial direction of the stator core, and the work space for the coil insertion work is surrounded by the inner peripheral surface of the stator core. There is a problem that workability is deteriorated because it is limited to a limited area. Conventionally, it has been desired to suppress breakage (short circuit) of the coil due to the collision of the coils during the operation of inserting the coil into the slot. In order to suppress the breakage of the coil, it is conceivable to divide the stator core and insert the coil. On the other hand, the motor characteristics may be deteriorated due to the division of the stator core. Moreover, it is desired to suppress the protrusion height of the coil end from increasing.

  The present invention has been made to solve the above-described problems, and one object of the present invention is that the coil is damaged when the coil is inserted into the slot, and the protruding height of the coil end is large. An object of the present invention is to provide a rotating electrical machine, a stator for a rotating electrical machine, and a vehicle that can improve the workability of mounting a coil in a slot while suppressing this.

  A rotating electrical machine according to a first aspect includes a rotor, a stator core having a plurality of slots, the stator core being disposed so as to face the rotor, and a plurality of coils mounted concentrically on the slots of the stator core. The coil includes a first coil, a second coil, and a third coil that are provided corresponding to each phase of the three-phase alternating current, and the first coil, the second coil, and the third coil are included in the stator core. The first coil, the second coil, and the third coil include a pair of axial portions extending in the axial direction and a first connecting portion that connects the pair of axial portions at one coil end in the axial direction. The coil ends on one side in the axial direction are bent inward in the radial direction of the stator core, and the first coupling portions of the first coil, the second coil, and the third coil are half of each other. It is displaced in the direction.

  In the rotating electrical machine according to the first aspect, as described above, by bending the first coil, the second coil, and the third coil inward in the radial direction of the stator core at the coil end on one side in the axial direction of the stator core, When the first coil, the second coil, and the third coil are inserted into the slot from the coil end side along the axial direction, the coil ends of the first coil, the second coil, and the third coil are prevented from colliding with the stator core. can do. As a result, the first coil, the second coil, and the third coil can be inserted into the slot from the coil end side along the axial direction. Therefore, the coil is inserted from the radial inner side to the outer side of the stator core. In contrast, the work space for inserting the first coil, the second coil, and the third coil can be provided outside the stator core in the axial direction. As a result, it is possible to improve workability when attaching the coil to the slot. The first coil, the second coil, and the third coil are connected to each other in the radial direction so that the first coil, the second coil, and the third coil are coiled along the axial direction. When the first coil, the second coil, and the third coil are sequentially inserted (installed) from the side into the slot, the first connecting portions of the first coil, the second coil, and the third coil are prevented from colliding with each other. The first coil, the second coil, and the third coil can be prevented from being damaged (short-circuited). In addition, by arranging the first coupling portions of the first coil, the second coil, and the third coil so as to be shifted from each other in the radial direction, the first coupling portions of the first coil, the second coil, and the third coil are mutually axial. Unlike the case of being shifted in the direction, it is possible to prevent the protruding height of the coil end from increasing. In other words, the above configuration improves the workability of attaching the coil to the slot while preventing the coil from being damaged and the protruding height of the coil end from increasing when the coil is inserted into the slot. Can be made.

  A stator for a rotating electrical machine according to a second aspect includes a stator core having a plurality of slots, and a plurality of coils mounted concentrically on the slots of the stator core, and the coils are provided corresponding to each phase of a three-phase alternating current. The first coil, the second coil, and the third coil, the first coil, the second coil, and the third coil extending in the axial direction of the stator core, and a pair of axial portions. And a first coupling portion that couples the first coil, the second coil, and the third coil at the coil end on one axial side of the stator core in the radial direction of the stator core. The first coupling portions of the first coil, the second coil, and the third coil are arranged so as to be displaced in the radial direction while being bent inward.

  In the rotating electrical machine stator according to the second aspect, as described above, the first coil, the second coil, and the third coil are bent inward in the radial direction of the stator core at the coil end on one side in the axial direction of the stator core. Thus, when the first coil, the second coil, and the third coil are inserted into the slot along the axial direction from the coil end side, the coil ends of the first coil, the second coil, and the third coil collide with the stator core. Can be suppressed. As a result, the first coil, the second coil, and the third coil can be inserted into the slot from the coil end side along the axial direction. Therefore, the coil is inserted from the radial inner side to the outer side of the stator core. In contrast, the work space for inserting the first coil, the second coil, and the third coil can be provided outside the stator core in the axial direction. As a result, it is possible to improve workability when attaching the coil to the slot. The first coil, the second coil, and the third coil are connected to each other in the radial direction so that the first coil, the second coil, and the third coil are coiled along the axial direction. When the first coil, the second coil, and the third coil are sequentially inserted (installed) from the side into the slot, the first connecting portions of the first coil, the second coil, and the third coil are prevented from colliding with each other. The first coil, the second coil, and the third coil can be prevented from being damaged (short-circuited). In addition, by arranging the first coupling portions of the first coil, the second coil, and the third coil so as to be shifted from each other in the radial direction, the first coupling portions of the first coil, the second coil, and the third coil are mutually axial. Unlike the case of being shifted in the direction, it is possible to prevent the protruding height of the coil end from increasing. In other words, the above configuration improves the workability of attaching the coil to the slot while preventing the coil from being damaged and the protruding height of the coil end from increasing when the coil is inserted into the slot. A stator for a rotating electrical machine that can be provided can be provided.

  A vehicle according to a third aspect is a vehicle including a rotating electrical machine, the rotating electrical machine having a rotor, a plurality of slots, a stator core disposed so as to face the rotor, and concentrically winding the slots of the stator core. And a stator provided with a plurality of attached coils, the coil including a first coil, a second coil, and a third coil provided corresponding to each phase of the three-phase alternating current, The coil, the second coil, and the third coil include a pair of axial portions extending in the axial direction of the stator core, and a first connecting portion that connects the pair of axial portions at a coil end on one axial side. The first coil, the second coil, and the third coil are bent inward in the radial direction of the stator core at one coil end in the axial direction of the stator core. First connecting portion Le, and the third coil is disposed radially offset from each other.

  In the vehicle according to the third aspect, as described above, the first coil, the second coil, and the third coil are bent inwardly in the radial direction of the stator core at the coil end on one side in the axial direction of the stator core. When the first coil, the second coil, and the third coil are inserted into the slot from the coil end side along the axial direction, the coil ends of the first coil, the second coil, and the third coil are prevented from colliding with the stator core. be able to. As a result, the first coil, the second coil, and the third coil can be inserted into the slot from the coil end side along the axial direction. Therefore, the coil is inserted from the radial inner side to the outer side of the stator core. In contrast, the work space for inserting the first coil, the second coil, and the third coil can be provided outside the stator core in the axial direction. As a result, it is possible to improve workability when attaching the coil to the slot. The first coil, the second coil, and the third coil are connected to each other in the radial direction so that the first coil, the second coil, and the third coil are coiled along the axial direction. When the first coil, the second coil, and the third coil are sequentially inserted (installed) from the side into the slot, the first connecting portions of the first coil, the second coil, and the third coil are prevented from colliding with each other. The first coil, the second coil, and the third coil can be prevented from being damaged (short-circuited). In addition, by arranging the first coupling portions of the first coil, the second coil, and the third coil so as to be shifted from each other in the radial direction, the first coupling portions of the first coil, the second coil, and the third coil are mutually axial. Unlike the case of being shifted in the direction, it is possible to prevent the protruding height of the coil end from increasing. In other words, the above configuration improves the workability of attaching the coil to the slot while preventing the coil from being damaged and the protruding height of the coil end from increasing when the coil is inserted into the slot. The vehicle which can be made to provide can be provided.

  According to the rotating electrical machine, the stator for the rotating electrical machine, and the vehicle, the coil is mounted in the slot while preventing the coil from being damaged and the protruding height of the coil end from being increased when the coil is inserted into the slot. Can be improved.

It is the perspective view which showed typically the whole structure of the electric motor by 1st Embodiment. It is the top view which looked at the electric motor shown in FIG. 1 from the axial direction (above). It is the bottom view which looked at the electric motor shown in FIG. 1 from the axial direction (downward). It is the perspective view which showed the U-phase coil of the electric motor by 1st Embodiment. It is the perspective view which showed the V phase coil of the electric motor by 1st Embodiment. It is the perspective view which showed the W phase coil of the electric motor by 1st Embodiment. It is the schematic diagram which showed the coil arrangement | positioning at the time of developing the stator of the electric motor shown in FIG. 1 planarly, and seeing from the radial direction outer side. It is a schematic diagram for demonstrating the structure of the coil of each phase of the electric motor shown in FIG. It is the perspective view which showed typically the whole structure of the electric motor by 2nd Embodiment. It is the top view which looked at the electric motor shown in FIG. 9 from the axial direction (above). It is the bottom view which looked at the electric motor shown in FIG. 9 from the axial direction (downward). It is the perspective view which showed the U-phase coil of the electric motor by 2nd Embodiment. It is the perspective view which showed the V phase coil of the electric motor by 2nd Embodiment. It is the perspective view which showed the W phase coil of the electric motor by 2nd Embodiment. It is a schematic diagram for demonstrating the electric motor by 3rd Embodiment. It is a block diagram for demonstrating the electric motor by 3rd Embodiment. It is a figure for demonstrating the motor vehicle by 4th Embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
First, with reference to FIGS. 1-8, the structure of the electric motor 100 by 1st Embodiment is demonstrated. 1st Embodiment demonstrates the electric motor 100 which is an example of a rotary electric machine.

  As shown in FIG. 1, the electric motor 100 includes a stator 1 that is a fixed portion, and a rotor 2 that is a rotating portion (see a one-dot chain line). The rotor 2 includes a shaft 21 (see an alternate long and short dash line), a rotor core 22 (see an alternate long and short dash line), and a plurality of permanent magnets (not shown), and is rotatable around the shaft 21. The stator 1 is an example of a “rotor electric machine stator”.

  The stator 1 includes a stator core 1a having a plurality of slots 11 and a plurality of coils 1b mounted in the slots. The stator core 1a is formed in a cylindrical shape, and has a plurality of teeth 12 extending inward in the radial direction B on the inner peripheral side. The teeth 12 are provided at equiangular intervals along the circumferential direction C of the stator core 1 a, and a portion between the teeth 12 is a slot 11.

  The electric motor 100 is a three-phase AC rotating electrical machine in which three-phase coils are concentrically wound with distributed windings and are mounted in the slots 11. For example, the electric motor 100 is composed of a rotating electrical machine having 8 poles and 48 slots, and the number of slots per phase per pole q = 2 (= 48 / (3 × 8)). The plurality of coils 1b are composed of three types of coils, a U-phase coil 30, a V-phase coil 40, and a W-phase coil 50, corresponding to each phase of the three-phase alternating current. As shown in FIGS. 4 to 6, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are configured to have different shapes and substantially the same circumference. The U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are examples of “first coil”, “second coil”, and “third coil”, respectively.

  An example of the concentric coil arrangement is shown in FIG. One coil 1b occupies two different slots 11 at intervals (four slots in FIG. 7), and two adjacent coils 1b of other phases are arranged in the slot 11 between one side at a time. Therefore, each coil 1b is arranged in two slots in the order of the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 from the right side in FIG.

  As shown in FIG. 8, each coil 1b is a flat strip-shaped edgewise coil in which flat conductive wires are wound and stacked. Specifically, the flat conducting wire has a substantially rectangular cross section having a width W1 and a thickness t1 (W1> t1) in the cross section. The flat conducting wires are stacked in a row in the thickness direction in the slot 11. Thereby, the coil 1b has the laminated surface f formed by laminating | stacking a flat conducting wire, and the end surface e of the lamination direction. The lamination width W2 of the lamination surface f is substantially equal to the thickness t1 of the flat conductor wire × the number of laminations, and the width of the end face e (the thickness of the coil 1b) is equal to the width W1 of the flat conductor wire. As shown in FIG. 1, each coil 1b arranged in the slot 11 has a portion (coil end) that protrudes (exposes) in the axial direction from both ends in the axial direction A of the stator core 1a (slot 11).

  Next, each phase coil will be described in detail. Hereinafter, the axial direction A of the cylindrical stator core 1a is referred to as “axial direction”, the radial direction B of the stator core 1a is referred to as “radial direction”, and the circumferential direction C of the stator core 1a is referred to as “circumferential direction”.

  As shown in FIGS. 1 and 4, the U-phase coil 30 includes a pair of coil side portions 31 inserted into different slots 11 and the other end in the axial direction of the stator core 1a at the coil end (arrow A1 direction side). The pair of bent portions 32 that are continuous from the pair of coil side portions 31 and the connecting portion 33 that connects the pair of bent portions 32 are provided. The coil side portion 31 is an example of an “axial portion”. The connecting portion 33 is an example of a “second connecting portion”.

  The pair of bent portions 32 have the same shape. Specifically, the bent portion 32 is formed by folding a coil side portion 31 protruding in the axial direction from the slot 11 into a substantially U shape radially outward at the coil end (see FIG. 1). As shown in FIG. 7, the protruding height (maximum height) of the bent portion 32 from the core end surface 1c is H1. Further, the bent portion 32 has a front end surface 32a (see FIG. 7) of the bent portion 32 at a distance D1 (D1 <H1) in the vicinity of the axial end surface (hereinafter referred to as the core end surface 1c) of the stator core 1a. The stator core 1a is formed to face the stator core 1a.

  As shown in FIGS. 1 and 4, the connecting portion 33 is formed so as to extend along the circumferential direction, and connects the end portions of the bent portion 32 in the vicinity of the core end surface 1 c. The connecting portion 33 is arranged so that the laminated surface f of the edgewise coil faces the core end surface 1c and is substantially parallel to the core end surface 1c. In addition, the coil end of the U-phase coil 30 is formed in a shape having a concave portion 34 that is opened in the axial direction and includes a pair of bent portions 32 and a connecting portion 33 when viewed from the radial direction. As shown in FIGS. 1 and 7, a part of a coil end of another coil (W-phase coil 50) is arranged inside the concave portion 34.

  Here, in the first embodiment, as shown in FIG. 4, the U-phase coil 30 is substantially L-shaped radially inward at the coil end on one axial side (arrow A2 direction side) of the stator core 1a. It includes a pair of bent portions 35 that are bent, and a connecting portion 36 that connects the pair of bent portions 35 to each other. U-phase coil 30 is bent in the radial direction of stator core 1a along the lamination direction of the rectangular conductive wires so as to have a shape different from that of V-phase coil 40 and W-phase coil 50. The U-phase coil 30 is bent radially inward at the coil end on one side (arrow A2 direction side) of the stator core 1a in the axial direction, and extends in the axial direction of the stator core 1a along the axial direction of the stator core 1a. It is configured to be inserted into the slot 11 from the coil end side on one side (arrow A2 direction side). Further, the protruding amount L1 of the bent portion 35 to the inner side in the radial direction of the stator core 1a is the protruding amount L2 (see FIG. 5) of the bent portion 43 of the V-phase coil 40 to be described later to the inner side in the radial direction. Compared with the amount L3 (see FIG. 6) of the bent portion 54 of the coil 50 protruding inward in the radial direction. The protruding amount is the length from the radially outer end of the bent portion 35 to the inner end.

  Moreover, the connection part 36 is formed so that it may extend along the circumferential direction, and is formed so that it may become substantially parallel to the core end surface 1c (rotor end surface). Further, the circumferential length L4 of the connecting portion 36 is the circumferential length L5 (see FIG. 5) of the connecting portion 44 of the V-phase coil 40 described later and the circumferential length of the connecting portion 55 of the W-phase coil 50. It is the largest compared to the length L6 (see FIG. 6). Further, the connecting portion 36 is disposed so that the end face e of the edgewise coil faces the axial direction (facing the core end face 1c of the stator core 1a) and faces the axial end face of the rotor 2. Moreover, the protrusion height from the core end surface 1c of the stator core 1a of the connection part 36 is H3. The connecting portion 36 is an example of a “first connecting portion”.

  As shown in FIGS. 1 and 5, the V-phase coil 40 directly connects the tip ends of a pair of coil side portions 41 protruding in the axial direction from the slot 11 on the other side (arrow A1 direction side) of the coil end. The connecting part 42 is included. The connecting portion 42 is formed to extend along the circumferential direction across the bent portion 32 of the U-phase coil 30 and the bent portion 52 of the W-phase coil 50 described later. The connecting portion 42 is disposed such that the laminated surface f of the edgewise coil faces the axial direction and faces the axial end surface of the rotor 2. The protruding height of the connecting portion 42 from the core end surface 1c is H2 (see FIG. 7). The coil side portion 41 is an example of an “axial portion”. The connecting portion 42 is an example of a “second connecting portion”.

  In the first embodiment, the V-phase coil 40 includes a pair of substantially S-shaped bent portions 43 and tip portions of the pair of bent portions 43 on one side (arrow A2 direction side) of the coil end. And a connecting portion 44 to be connected. V-phase coil 40 is bent in the radial direction of stator core 1a along the lamination direction of the rectangular conductive wires so as to have a shape different from that of U-phase coil 30 and W-phase coil 50. Further, the V-phase coil 40 is bent radially inward at the coil end on one side (arrow A2 direction side) of the stator core 1a in the axial direction, and extends in the axial direction of the stator core 1a along the axial direction of the stator core 1a. It is configured to be inserted into the slot 11 from the coil end side on one side (arrow A2 direction side). Further, the protruding amount L2 of the bent portion 43 toward the inner side in the radial direction of the stator core 1a is the protruding amount L1 of the bent portion 35 of the U-phase coil 30 toward the inner side in the radial direction (see FIG. 4). The amount of protrusion L3 (see FIG. 6) inward in the radial direction of the bent portion 54 of the coil 50 is the largest. The bent portion 43 is formed so as to pass through the inner side in the axial direction of the connecting portion 36 of the U-phase coil 30 so as not to contact the connecting portion 36, and the axial direction of the bent portion 54 of the W-phase coil 50. It is formed so as to pass through the inside so as not to contact the connecting portion 55 (see FIG. 6). The connecting portion 44 is an example of a “first connecting portion”.

  The circumferential length L5 of the connecting portion 44 is the circumferential length L4 (see FIG. 4) of the connecting portion 36 of the U-phase coil 30 and the circumferential length of the connecting portion 55 of the W-phase coil 50 described later. It is the smallest compared to the length L6 (see FIG. 6). The connecting portion 44 is arranged such that the laminated surface f of the edgewise coil faces in the axial direction (facing the core end surface 1c of the stator core 1a and facing the axial end surface of the rotor 2). The protruding height of the connecting portion 44 of the coil 40 from the core end surface 1c is H4.

  As shown in FIGS. 1 and 6, the W-phase coil 50 is continuous from the pair of coil sides 51 on the other side (arrow A1 direction side) of the coil end, and is bent into a substantially S shape radially outward. The pair of bent portions 52 and a connecting portion 53 that connects the pair of bent portions 52 are provided. The bent portion 52 is disposed such that the distal end surface of the bent portion 52 faces the side opposite to the core end surface 1c (the axially outer side). The bent portion 52 is disposed in the concave portion 34 of the U-phase coil 30. Connecting portion 53 is formed so as to extend along the circumferential direction, and is arranged to overlap with connecting portion 33 of U-phase coil 30 in the axial direction. The connecting portion 53 is disposed so that the laminated surface f of the edgewise coil faces the axial direction and faces the axial end surface of the rotor 2. The protrusion height from the core end surface 1c of the connection part 53 is H2 (refer FIG. 7). Therefore, at the other coil end, the connecting portion 53 of the W-phase coil 50 and the connecting portion 42 of the V-phase coil 40 are arranged so as to be aligned along the radial direction (see FIG. 2). The coil side 51 is an example of an “axial portion”. The connecting portion 53 is an example of a “second connecting portion”.

  In the first embodiment, the W-phase coil 50 includes, on one side of the coil end (arrow A2 direction side), a pair of bent portions 54 that are bent in a substantially S shape radially inward, and a pair of folded portions. It includes a connecting portion 55 that connects the curved portion 54. W-phase coil 50 is bent in the radial direction of stator core 1a along the laminating direction of the rectangular conductive wire so as to have a shape different from that of U-phase coil 30 and V-phase coil 40. The W-phase coil 50 is bent radially inward at the coil end on one axial side (arrow A2 direction side) of the stator core 1a, and extends in the axial direction of the stator core 1a along the axial direction of the stator core 1a. It is configured to be inserted into the slot 11 from the coil end side on one side (arrow A2 direction side). Further, the protruding amount L3 of the bent portion 54 toward the radially inner side of the stator core 1a is larger than the bent portion 35 (see FIG. 4) of the U-phase coil 30, and the bent portion 43 (see FIG. 5) of the V-phase coil 40. Smaller than see). That is, as shown in FIG. 3, the connecting portion 36 of the U-phase coil 30, the connecting portion 55 of the W-phase coil 50, and the connecting portion 44 of the V-phase coil 40 are viewed from the outside in the radial direction. They are arranged in this order toward the inside. The connecting portion 55 is an example of a “first connecting portion”.

  The bent portion 54 is formed so as to pass through the inner side in the axial direction of the connecting portion 36 of the U-phase coil 30 so as not to contact the connecting portion 36. In the first embodiment, as shown in FIGS. 1 to 3, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 do not contact at the coil end on one side in the axial direction of the stator core 1 a. Are arranged so as to cross each other (that is, at a predetermined interval from each other).

  Moreover, the connection part 55 is formed so that it may extend along the circumferential direction. Further, the circumferential length L6 of the connecting portion 55 is smaller than the circumferential length L4 (see FIG. 4) of the connecting portion 36 of the U-phase coil 30 and the circumferential length of the connecting portion 44 of the V-phase coil 40. It is larger than the length L5 (see FIG. 5). Further, the connecting portion 55 is disposed so that the laminated surface f of the edgewise coil faces the axial direction (facing the core end surface 1c of the stator core 1a) and faces the axial end surface of the rotor 2. Moreover, the protrusion height from the core end surface 1c of the connection part 55 of the W-phase coil 50 is H5. And the protrusion height H3 (refer FIG. 4) from the core end surface 1c of the stator core 1a of the connection part 36 of the U-phase coil 30 is the protrusion height H4 (refer FIG. 4) from the core end surface 1c of the connection part 44 of the V-phase coil 40. 5) and substantially larger than the protruding height H5 (see FIG. 6) of the connecting portion 55 of the W-phase coil 50 from the core end face 1c. That is, H3 = H4> H5. As a result, in the first embodiment, the connecting portion 55 of the W-phase coil 50 is in the axial direction of the stator core 1a with respect to the other connecting portions (the connecting portion 36 of the U-phase coil 30 and the connecting portion 44 of the V-phase coil 40). It is arranged at a position shifted in the direction of arrow A1 (in the height direction).

  As described above, by configuring the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50, in the first embodiment, as shown in FIG. 3, the U-phase coil 30, the V-phase coil 40, and the W-phase are used. The coil 50 is bent inward in the radial direction of the stator core 1a at the coil end on one axial side (arrow A2 direction side) of the stator core 1a. In addition, the connecting portion 36 of the U-phase coil 30, the connecting portion 44 of the V-phase coil 40, and the connecting portion 55 of the W-phase coil 50 are different from each other in the amount L1, L2, and L3 projecting radially inward. , They are arranged so as to be displaced from each other in the radial direction. Further, the connecting portion 36 of the U-phase coil 30, the connecting portion 44 of the V-phase coil 40, and the connecting portion 55 of the W-phase coil 50 are arranged at the coil ends on one side (arrow A2 direction side) in the axial direction of the stator core 1a. When viewed from the direction, they are displaced in the radial direction so as not to overlap each other. Further, as shown in FIGS. 1 to 3, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are not in contact with each other at the coil end on one side (arrow A <b> 2 direction side) in the axial direction of the stator core 1 a. The U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are arranged so as to be shifted from each other in the radial direction.

  In the first embodiment, as described above, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are bent inward in the radial direction of the stator core 1a at one end of the stator core 1a in the axial direction. When the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are inserted into the slot 11 along the axial direction from the coil end side, the coils of the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are It is possible to suppress the end from colliding with the stator core 1a. Accordingly, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 can be inserted into the slot 11 from the coil end side along the axial direction, so that the coils are directed from the inner side to the outer side in the radial direction of the stator core 1a. Unlike the case of inserting the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50, the work space for inserting the U-phase coil 30, V-phase coil 40, and W-phase coil 50 can be taken outside the stator core 1 a in the axial direction. As a result, workability when the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are mounted in the slot 11 can be improved.

  Further, the U-phase coil 30, the V-phase coil 40 are arranged by shifting the connecting portion 36 of the U-phase coil 30, the connecting portion 44 of the V-phase coil 40, and the connecting portion 55 of the W-phase coil 50 so as to be shifted in the radial direction. When the W-phase coil 50 and the W-phase coil 50 are sequentially inserted (attached) from the coil end side along the axial direction into the slot 11, the connection portion 36 of the U-phase coil 30, the connection portion 44 of the V-phase coil 40 and the W-phase coil 50 Since the connection portions 55 are prevented from colliding with each other, the U-phase coil 30, the V-phase coil 40 and the W-phase coil 50 are prevented from being damaged (short-circuited) due to the collision when being mounted in the slot 11. Can do. Further, the connecting portion 36 of the U-phase coil 30, the connecting portion 44 of the V-phase coil 40, and the connecting portion 55 of the W-phase coil 50 are arranged so as to be shifted from each other in the radial direction. Unlike the case where the connecting portion 44 of the V-phase coil 40 and the connecting portion 55 of the W-phase coil 50 are arranged so as to be shifted from each other in the axial direction, an increase in the protruding height of the coil end can be suppressed. That is, by configuring as described above, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are damaged when the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are inserted into the slot 11. In addition, it is possible to improve the workability of attaching the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 to the slot 11 while suppressing an increase in the protruding height of the coil end.

  In the first embodiment, as described above, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are arranged inside the stator core 1 a in the radial direction at the coil end on one side in the axial direction of the stator core 1 a. It is configured such that it can be bent and inserted into the slot 11 from the coil end side on one side of the stator core 1a in the axial direction along the axial direction of the stator core 1a. Thereby, unlike the case where the coil is moved from the inner side to the outer side in the radial direction and inserted into the slot 11, the workability when the U-phase coil 30, the V-phase coil 40 and the W-phase coil 50 are attached to the slot 11 is improved. It can certainly be improved.

  Moreover, in 1st Embodiment, as mentioned above, the connection part 36 of the U-phase coil 30, the connection part 44 of the V-phase coil 40, and the connection part 55 of the W-phase coil 50 are connected to the bent parts 35, 43, and 54. The amount of protrusion (L1, L2, and L3) inward in the radial direction of the stator core 1a is made different from each other so as to be shifted in the radial direction. Thereby, the connection part 36 of the U-phase coil 30, the connection part 44 of the V-phase coil 40, and the connection part 55 of the W-phase coil 50 can be easily displaced in the radial direction.

  In the first embodiment, as described above, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are configured to have different shapes from each other, and the coil end on one side in the axial direction of the stator core 1a. The bent portion 35, the bent portion 43, and the bent portion 54 are configured to have at least one of a substantially U shape, a substantially L shape, and a substantially S shape. Thereby, the connection part 36 of the U-phase coil 30, the connection part 44 of the V-phase coil 40, and the connection part 55 of the W-phase coil 50 can be easily shifted in the radial direction.

  In the first embodiment, as described above, the connecting portion 36 of the U-phase coil 30, the connecting portion 44 of the V-phase coil 40, and the connecting portion 55 of the W-phase coil 50 are divided into the wide laminated surface f and the laminated surface. The laminated surface f or the end surface e is configured to face the axial end surface (core end surface 1c) of the stator core 1a. As a result, compared to the case where all the wide laminated surfaces f of the three coils face the axial end surface of the stator core 1a, the three connections when the respective connecting portions 36, 44 and 55 are shifted inward in the radial direction. The total length in the radial direction of the portions 36, 44 and 55 can be reduced.

  In the first embodiment, as described above, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 intersect with each other without contacting at the coil end on one side in the axial direction of the stator core 1a. Accordingly, the connecting portion 36 of the U-phase coil 30, the connecting portion 44 of the V-phase coil 40, and the connecting portion 55 of the W-phase coil 50 are arranged so as to be shifted in the radial direction. Thereby, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are prevented from being short-circuited due to the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 being in contact with each other. The connecting portions 36, 44, and 55 can be arranged so as to be shifted in the radial direction.

  In the first embodiment, as described above, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are bent inward in the radial direction of the stator core 1a at one end of the stator core 1a in the axial direction. At the other end, the coil end extends along the axial direction of the stator core 1a or bends outward in the radial direction of the stator core 1a. Thus, unlike the case where the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are bent radially inward at the coil ends on both sides in the axial direction of the stator core 1a, the rotor 2 can be easily connected to the stator core 1a. Can be inserted inside.

  In the first embodiment, as described above, at least two of the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 (the U-phase coil 30 and the W-phase coil 50) are connected to the shaft of the stator core 1a. At the other coil end in the direction, the stator core 1a is bent outward in the radial direction, and at least two of the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 (the U-phase coil 30 and the W-phase coil 50). ) Are overlapped along the axial direction. Thus, unlike the case where the connecting portion 33, the connecting portion 42, and the connecting portion 53 of the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are shifted in the radial direction without overlapping, the radial direction of the electric motor 100 is increased. An increase in length can be suppressed.

  In the first embodiment, as described above, the connecting portion 36 of the U-phase coil 30, the connecting portion 44 of the V-phase coil 40, and the connecting portion 55 of the W-phase coil 50 are connected to one side in the axial direction of the stator core 1a. The coil ends are arranged so as to be shifted in the radial direction so as not to overlap each other when viewed from the axial direction. Thereby, when inserting the U-phase coil 30, the V-phase coil 40 and the W-phase coil 50 into the slot from the coil end side along the axial direction, the connecting portion 36 of the U-phase coil 30 and the connecting portion of the V-phase coil 40. 44 and the connecting portion 55 of the W-phase coil 50 are reliably prevented from colliding with each other, so that the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are damaged (short-circuited) due to the collision. It can be surely suppressed.

  In the first embodiment, as described above, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are configured by strip-shaped edgewise coils in which flat conductor wires are wound and stacked. The U-phase coil 30 is formed by bending the V-phase coil 40 and the W-phase coil 50 at least at one end in the axial direction of the stator core 1a inward in the radial direction of the stator core 1a along the laminating direction of the flat wire. The connecting portion 36, the connecting portion 44 of the V-phase coil 40 and the connecting portion 55 of the W-phase coil 50 are arranged so as to be shifted in the radial direction. Thereby, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50, which are edgewise coils, can be easily bent in the radial direction.

  In the first embodiment, as described above, at least one of the connection portion 36 of the U-phase coil 30, the connection portion 44 of the V-phase coil 40, and the connection portion 55 of the W-phase coil 50 (first In the embodiment, the connecting portion 55 of the W-phase coil 50 is connected to the other connecting portions (the connecting portion 36 of the U-phase coil 30 and the connecting portion 44 of the V-phase coil 40) in the axial direction (height direction) of the stator core. Place it at a shifted position. Thereby, unlike the case where the positions in the axial direction (height direction) of the connecting portion 36 of the U-phase coil 30, the connecting portion 44 of the V-phase coil 40 and the connecting portion 55 of the W-phase coil 50 are all the same, the U-phase coil 30. It is possible to more reliably prevent the connecting portion 36, the connecting portion 44 of the V-phase coil 40 and the connecting portion 55 of the W-phase coil 50 from colliding with each other.

  In the first embodiment, as described above, the bent portion 35 of the U-phase coil 30 has a substantially L shape, and the amount of protrusion of the stator core 1a in the radial direction is minimized, so that the V-phase The bent portion 43 of the coil 40 has a substantially S shape, and the amount of protrusion of the stator core 1a in the radial direction is maximized, and the bent portion 54 of the W-phase coil 50 has a substantially S shape. At the same time, the amount of protrusion of the stator core 1 a inward in the radial direction is larger than the bent portion 35 of the U-phase coil 30 and smaller than the bent portion 43 of the V-phase coil 40. Thereby, the connection part 36 of the U-phase coil 30, the connection part 44 of the V-phase coil 40, and the connection part 55 of the W-phase coil 50 can be easily displaced in the radial direction.

(Second Embodiment)
Next, with reference to FIGS. 9-14, the structure of the electric motor 200 by 2nd Embodiment is demonstrated. In the second embodiment, unlike the first embodiment in which the connecting portion 42 of the V-phase coil 40 and the connecting portion 53 of the W-phase coil 50 are arranged along the radial direction, the U-phase coil 130. An example in which the connecting portion 33, the connecting portion 144 of the V-phase coil 140, and the connecting portion 53 of the W-phase coil 150 are arranged in the axial direction will be described. The electric motor 200 is an example of a “rotary electric machine”. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 9, the stator 101 according to the second embodiment includes a plurality of coils 101b (a U-phase coil 130, a V-phase coil 140, and a W-phase coil 150). The U-phase coil 130, the V-phase coil 140, and the W-phase coil 150 are examples of “first coil”, “second coil”, and “third coil”, respectively. The stator 101 is an example of a “rotor electric machine stator”.

  As shown in FIGS. 9 and 12, the U-phase coil 130 of the second embodiment has the same shape as the U-phase coil 30 of the first embodiment at the coil end on the other side (arrow A1 direction side). . In addition, the U-phase coil 130 connects a pair of bent portions 131 that are bent in a substantially S shape radially inward and a pair of the bent portions 131 at the coil end on one side (arrow A2 direction side). Connecting part 132 to be included. The front end surface 131a of the bent portion 131 is formed so as to face outward in the axial direction. Further, a protruding amount L7 of the bent portion 131 to the radially inner side of the stator core 1a is a protruding amount L8 of the bent portion 145 (folded portion 146) of the V-phase coil 140 described later to the radially inner side (see FIG. 13). ) And smaller than the protruding amount L9 (see FIG. 14) of the bent portion 151 of the W-phase coil 150 inward in the radial direction. The connecting portion 132 is an example of a “first connecting portion”.

  The connecting portion 132 is formed so as to extend along the circumferential direction, the laminated surface f of the edgewise coil is opposed to the axial end surface of the rotor 2 (facing the core end surface 1c of the stator core 1a), and substantially parallel. It is formed to become. Further, the connecting portion 132 is disposed on the radially inner side of the stator core 1a so as not to overlap the stator core 1a in the axial direction. Further, the circumferential length L10 of the connecting portion 132 is smaller than the circumferential length L11 (see FIG. 13) of the connecting portion 147 of the V-phase coil 140 described later, and the circumference of the connecting portion 152 of the W-phase coil 150 is smaller. It is larger than the direction length L12 (see FIG. 14). At the coil end on one side of the U-phase coil 130, a pair of bent portions 131 and a connecting portion 132 form a concave portion 133 whose inner side in the axial direction is open. Moreover, the protrusion height from the core end surface 1c of the stator core 1a of the connection part 132 is H11.

  As shown in FIGS. 9 and 13, the V-phase coil 140 has a pair of coil sides 141 that extend in the axial direction and are inserted into different slots 11. In addition, the V-phase coil 140 includes, at the coil end, a bent portion 142 that is continuous from one coil side portion 141, a bent portion 143 that is continuous from the other coil side portion 141, a bent portion 142, and a bent portion. And a connecting portion 144 for connecting 143. The coil side portion 141 is an example of an “axial portion”. The connecting portion 144 is an example of a “second connecting portion”.

  The bent portion 142 is radially outward, and the distal end surface 142a of the bent portion 142 is folded back toward the connecting portion 33 side (core end surface 1c side) of the U-phase coil 130. It has a substantially U shape similar to that of the bent portion 32. The protruding height of the bent portion 142 is H13, and the protruding height of the bent portion 32 is larger than H12 (see FIG. 12). The front end surface 142 a of the bent portion 142 is disposed inside the concave portion 34 formed by the pair of bent portions 32 of the U-phase coil 130 and the connecting portion 33 and at a position near the connecting portion 33. Yes.

  The bent portion 143 is such that the coil side portion 141 protruding in the axial direction from the slot 11 is radially outward at the coil end, and the distal end surface 143a of the bent portion 143 is opposite to the connecting portion 33 of the U-phase coil 130. It is bent toward (outside in the axial direction) and has a substantially S shape. Specifically, the bent portion 143 is formed into a substantially S-shape by being folded outward at approximately 90 degrees along the stacking direction (radial direction) of the flat wire, and then internally folded at approximately 90 degrees. Has been. The front end surface 143a of the bent portion 143 faces the opposite side (axially outer side) from the core end surface 1c. The protruding height of the front end surface 143a of the bent portion 143 is equal to the protruding height H13 of the bent portion 142. In addition, bent portion 143 is arranged inside concave portion 34 of U-phase coil 130 (adjacent U-phase coil 130) different from bent portion 142.

  The connecting portion 144 connects the distal end portion of the bent portion 142 facing the core end surface 1c side (connecting portion 33 side) and the distal end portion of the bent portion 143 facing the opposite side of the core end surface 1c. Is formed. The connecting portion 144 includes a step including a concave first portion 144a that is open on the outer side in the axial direction and a convex second portion 144b that straddles the bent portion 32 of the U-phase coil 130 when viewed from the radial direction. It has a shape. The concave first portion 144 a is arranged in the vicinity of the coupling portion 33 in the concave portion 34 of the U-phase coil 130 by coupling with the distal end portion of the bent portion 142. The convex second portion 144b is formed so as to straddle the bent portion 32 of the U-phase coil 130 from the outside in the axial direction by being connected to the distal end portion of the bent portion 143. The first portion 144a and the second portion 144b are arranged so that the laminated surface f of the edgewise coil faces the core end surface 1c, is substantially parallel to the core end surface 1c, and extends in the circumferential direction, except for the central step portion. Is formed. As described above, as shown in FIG. 10, the connecting portion 144 is disposed so as to overlap the connecting portion 33 of the U-phase coil 130 in the axial direction.

  As shown in FIGS. 9 and 13, the V-phase coil 140 has a bent portion 145 that is bent in a substantially S shape radially inward at the coil end on one side (arrow A2 direction side), and a radially inner side. A bent portion 146 that is folded back into a substantially U shape, and a connecting portion 147 that connects the distal end portion of the bent portion 145 and the distal end portion of the bent portion 146. Here, a substantially U-shaped bent portion 146 is formed on the opposite side of the substantially S-shaped bent portion 143 at the coil end on the other side (arrow A1 direction side). A substantially S-shaped bent portion 145 is formed on the opposite side of the substantially U-shaped bent portion 142 at the coil end on the other side (arrow A1 direction side). Further, a protruding amount L8 of the bent portion 145 (the bent portion 146) to the radially inner side of the stator core 1a is a protruding amount L7 of the bent portion 131 of the U-phase coil 130 to the radially inner side (see FIG. 12). And it is the smallest compared with the protrusion amount L9 (refer FIG. 14) to the radial inside of the bending part 151 of the W phase coil 150 mentioned later. The connecting portion 147 is an example of a “first connecting portion”.

  In the second embodiment, the connecting portion 147 includes a concave first portion 147a whose inner side in the axial direction is opened and a convex second portion 147b whose outer side in the axial direction is opened as viewed from the radial direction. A stepped shape is included. The first portion 147a and the second portion 147b are formed so as to extend in the circumferential direction, and the laminated surface f of the edgewise coil is opposed to the axial end surface of the rotor 2 (except for the stator core 1a) except for the step portion at the center. It faces the core end face 1c) and is substantially parallel. Further, the circumferential length L11 of the connecting portion 147 of the V-phase coil 140 is the circumferential length L10 of the connecting portion 132 of the U-phase coil 130 (see FIG. 12) and the connection of the W-phase coil 150 described later. Compared with the circumferential length L12 of the portion 152 (see FIG. 14), it is the largest. Moreover, the connection part 147 is arrange | positioned so that it may not overlap with an axial direction with the stator core 1a inside the radial direction of the stator core 1a. Further, the bent portion 131 of the U-phase coil 130 is disposed in the concave first portion 147a. Moreover, the protrusion height from the core end surface 1c of the stator core 1a of the connection part 147 of the V-phase coil 140 is H14.

  As shown in FIGS. 9 and 14, the W-phase coil 150 has the same shape as the W-phase coil 50 of the first embodiment at the coil end on the other side (arrow A1 direction side). W-phase coil 150 has a pair of bent portions 151 that are bent in a substantially L shape radially inward at the coil end on one side (arrow A2 direction side), and tip portions of the pair of bent portions 151. And a connecting portion 152 for connecting the two. The connecting portion 152 is an example of a “first connecting portion”.

  The pair of bent portions 151 extend linearly inward in the radial direction and are disposed so as to be within the concave first portion 147a of the V-phase coil 140 (inward in the axial direction). Further, the bent portion 151 is disposed so as to be accommodated inside the concave portion 133 (the inner side in the axial direction) of the U-phase coil 130. Further, the bent portion 151 passes through the inner side in the axial direction of the connecting portion 132 of the U-phase coil 130 and extends further inward in the radial direction than the connecting portion 147 of the V-phase coil 140 and the connecting portion 132 of the U-phase coil 130. Further, the protruding amount L9 of the bent portion 151 toward the radially inner side of the stator core 1a is the protruding amount L7 of the bent portion 131 of the U-phase coil 130 toward the radially inner side (see FIG. 12) and the V-phase coil 140. This is the largest amount L8 (see FIG. 13) protruding radially inward of the bent portion 145 (folded portion 146).

  As shown in FIG. 14, the connecting portion 152 has an end face e of the edgewise coil facing the axial direction and facing the axial end face of the rotor 2 (facing the core end face 1c of the stator core 1a). It is formed to be parallel. Further, the connecting portion 152 is disposed on the radially inner side of the stator core 1a so as not to overlap the stator core 1a in the axial direction. Further, the circumferential length L12 of the connecting portion 152 of the W-phase coil 150 is equal to the circumferential length L10 of the connecting portion 132 of the U-phase coil 130 (see FIG. 12) and the connecting portion 147 of the V-phase coil 140. Is smaller than the circumferential length L11 (see FIG. 13).

  Moreover, the protrusion height from the core end surface 1c of the stator core 1a of the connection part 152 of the W-phase coil 150 is H15. And the protrusion height H14 from the core end surface 1c of the stator core 1a of the connection part 147 (refer FIG. 13) of the V-phase coil 140 is the protrusion height H11 from the core end surface 1c of the connection part 132 of the U-phase coil 130 (FIG. 12), and is larger than the protrusion height H15 from the core end face 1c of the connecting portion 152 of the W-phase coil 150. That is, H11> H14> H15. As a result, in the second embodiment, the connecting portion 132 of the U-phase coil 130, the connecting portion 147 of the V-phase coil 140, and the connecting portion 152 of the W-phase coil 150 are mutually in the axial direction (height direction) of the stator core 1a. It is arranged at a position shifted to. The maximum protrusion height at the coil end on the other end side of the stator 101 is the protrusion height H11 of the tip surface 131a of the bent portion 131 of the U-phase coil 130. Therefore, the coil ends of the respective phases are arranged so as to be located on the inner side in the axial direction from the concave portion 133 of the U-phase coil 130 having the protruding height H11.

  As described above, by configuring the U-phase coil 130, the V-phase coil 140, and the W-phase coil 150, in the second embodiment, as shown in FIG. 11, the U-phase coil 130, the V-phase coil 140, and the W-phase are configured. The coil 150 is bent radially inward of the stator core 1a at the coil end on one axial side (arrow A2 direction side) of the stator core 1a. Further, the connecting portion 132 of the U-phase coil 130, the connecting portion 147 of the V-phase coil 140, and the connecting portion 152 of the W-phase coil 150 are made different from each other in the amount L7, L8, and L9 projecting radially inward. , They are arranged so as to be displaced from each other in the radial direction. Further, the connecting portion 132 of the U-phase coil 130 and the connecting portion 147 of the V-phase coil 140 are partially viewed from the axial direction at the coil end on one side (arrow A2 direction side) in the axial direction of the stator core 1a. So that they overlap each other in the radial direction. In addition, connecting portion 152 of W-phase coil 150 is connected to connecting portion 132 of U-phase coil 130 and V-phase coil 140 at the coil end on one side (arrow A2 direction side) in the axial direction of stator core 1a as viewed from the axial direction. The connecting portions 147 are arranged so as to be shifted in the radial direction so as not to overlap.

  Other configurations of the second embodiment are the same as those of the first embodiment.

  In the second embodiment, as described above, the connecting portion 147 of the V-phase coil 140 is configured to include the concave first portion 147a and the convex second portion 147b, and the convex shape of the V-phase coil 140 is formed. The second portion 147b of the U-phase coil 130 is disposed so as to straddle the second portion 147b. Thereby, the bending part 131 of the U-phase coil 130 can be protruded radially inward without the U-phase coil 130 and the V-phase coil 140 colliding with each other.

  Other effects of the second embodiment are the same as those of the first embodiment.

(Third embodiment)
Next, with reference to FIG. 15 and FIG. 16, the structure of the electric motor 400 by 3rd Embodiment is demonstrated. In the third embodiment, an example will be described in which a low-speed coil portion and a low-speed coil portion are provided in the coils of the respective phases of the first and second embodiments. The electric motor 400 is an example of a “rotary electric machine”.

  In the third embodiment, the coil shape of each phase is arbitrary, and can be applied to any of the coil shapes shown in the first and second embodiments. Therefore, here, an example in which the configuration of the third embodiment is applied to the coils of the first embodiment (the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50) will be described.

  As shown in FIG. 15, in the stator 401 according to the third embodiment, the coils 401 b composed of the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 include the low-speed coil section 460 and the low-speed coil section, respectively. A coil portion 470. Specifically, in each coil 401 b, a part of the laminated rectangular conductor wire constitutes a low-speed coil part 460 and the other part constitutes a low-speed coil part 470. The low-speed coil portion 460 and the low-speed coil portion 470 are separated from each other by an insulating member 480. Thus, each coil 401 b is configured such that the low-speed coil portion 460 and the low-speed coil portion 470 are arranged in the common slot 11. The stator 401 is an example of a “rotor electric machine stator”.

  The low speed / high speed coil section 460 of each coil 401b is used both when the electric motor 400 is driven at low speed and during high speed driving, and the low speed coil section 470 is configured to be used only when the electric motor 400 is driven at low speed. Yes. As shown in FIG. 16, the connection state of the low-speed coil section 460 and the low-speed coil section 470 can be switched by the winding switching section CS.

  Specifically, electric motor 400 is connected to power supply unit BU and winding switching unit CS. The electric motor 400 is configured to be driven in response to three-phase AC power supplied from the power supply unit BU.

  The low-speed coil portion 460 and the low-speed coil portion 470 of each coil 401b are electrically connected in series. Terminals TU1, TV1, and TW1 on one side of the low-speed coil unit 460 are connected to the power supply unit BU. Further, terminals TU2, TV2 and TW2 on the other side of the low-speed coil unit 460 and on one side of the low-speed coil unit 470 are connected to the winding switching unit CS. The terminals TU3, TV3, and TW3 on the other side of the low speed coil unit 470 are connected to the winding switching unit CS.

  Winding switching unit CS includes a high-speed switch SW1 for short-circuiting terminals TU2, TV2 and TW2 of electric motor 400 and a low-speed switch SW2 for short-circuiting terminals TU3, TV3 and TW3 of electric motor 400.

  The winding switching unit CS turns off the high-speed switch SW1 and turns on the low-speed switch SW2 during low-speed driving. As a result, the terminals TU3, TV3, and TW3 are short-circuited, and a voltage is applied to both the low-speed coil unit 460 and the low-speed coil unit 470 in each phase coil 401b of the electric motor 400. Thereby, since the impedance of the coil 401b of each phase becomes large, a large voltage can be applied to the coil 401b, and the torque of the electric motor 400 during low speed driving can be increased.

  The winding switching unit CS turns on the high-speed switch SW1 and turns off the low-speed switch SW2 during high-speed driving. As a result, the terminals TU2, TV2, and TW2 are short-circuited, and a voltage is applied only to the low-speed coil section 460 in each phase coil 401b of the electric motor 400. As a result, since the impedance of the coil 401b of each phase is smaller than when driving at low speed, the electric motor 400 can be driven at high speed.

  Other configurations of the third embodiment are the same as those of the first embodiment.

  In the third embodiment, as described above, the coil 401b of each phase is provided with the low-speed coil unit 470 used only at low speeds and the low-high speed coil unit 460 used at both high speeds and low speeds. The low speed coil portion 470 and the low speed coil portion 460 are disposed in the common slot 11. As a result, it is possible to obtain an electric motor 400 that can suppress pulsation when the electric motor 400 rotates and that can switch windings according to the driving speed.

(Fourth embodiment)
Next, with reference to FIG. 17, the structure of the motor vehicle 500 by 4th Embodiment is demonstrated. The automobile 500 is an example of a “vehicle”.

  As shown in FIG. 17, the automobile 500 is provided with any one of the electric motors 100, 200, and 400 of the first to third embodiments. In addition, the other structure of 4th Embodiment is the same as that of the said 1st-3rd embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first to third embodiments, the electric motor and the electric motor stator have been described. However, a rotating electric machine such as a generator other than the electric motor and a stator for the electric rotating machine may be used.

  Moreover, in the said 1st-3rd embodiment, although the example using the edgewise coil which wound and laminated | stacked the flat conducting wire was shown, the coil which bundled the round wire may be used.

  Moreover, in the said 1st-3rd embodiment, although the connection part of each phase coil of U phase, V phase, and W phase was formed so that it might extend along the circumferential direction of a stator core, the connection part was shown. Further, it may be formed so as to extend in an arc shape along the circumferential direction, or may be formed so as to extend linearly along the circumferential direction. Moreover, you may form a connection part so that it may extend in curvilinear form other than circular arc shape along the circumferential direction.

  In the first embodiment, the coil shown in FIG. 4 is a U-phase coil (first coil), the coil shown in FIG. 5 is a V-phase coil (second coil), and the shape shown in FIG. In the example shown in FIG. 4, the coil having the shape shown in FIG. 4 is a V-phase coil (W-phase coil), and the coil having the shape shown in FIG. 5 is a W-phase coil (U). 6 may be used as the U-phase coil (V-phase coil). That is, it is only necessary that coils having the same shape have the same phase. Similarly, the coils of the second embodiment (FIGS. 12, 13, and 14) may have the same shape and the same phase.

  Moreover, in the said 4th Embodiment, although the example in which the electric motor of the said 1st-3rd embodiment was provided in the motor vehicle was shown, the said 1st-1st is provided in vehicles, such as for construction machines, and agricultural vehicles. You may provide the electric motor of 3 embodiment. Moreover, you may provide the electric motor of the said 1st-3rd embodiment in a ship, an aircraft, etc. other than a vehicle, for example.

1, 101, 401 Stator (stator for rotating electrical machine)
1a Stator core 1b, 101b, 401b Coil 2 Rotor 11 Slot 30, 130 U-phase coil (first coil)
31, 41, 51, 141 Coil side part (axial part)
33, 42, 53, 144 connecting part (second connecting part)
35, 43, 54, 131, 145, 146, 151 Bending part 36, 44, 55, 132, 147, 152 Connecting part (first connecting part)
40, 140 V-phase coil (second coil)
50, 150 W phase coil (third coil)
100, 200, 400 Electric motor (rotary electric machine)
147a 1st part 147b 2nd part 460 Low speed coil part 470 Low speed coil part 500 Automobile (vehicle)
f Laminated surface (first surface)
e End face (second face)

Claims (20)

A rotor (2);
A stator core (1a) having a plurality of slots (11) and arranged to face the rotor, and a plurality of coils (1b, 101b, 401b) mounted concentrically on the slots of the stator core. Including stators (1, 101, 401),
The coil includes a first coil (30, 130), a second coil (40, 140), and a third coil (50, 150) provided corresponding to each phase of three-phase alternating current,
The first coil, the second coil, and the third coil include a pair of axial portions (31, 41, 51, 141) extending in the axial direction of the stator core, and the pair of axial portions as one of the axial directions. A first connecting portion (36, 44, 55, 132, 147, 152) connected at the coil end on the side,
The first coil, the second coil, and the third coil are bent inward in the radial direction of the stator core at a coil end on one axial side of the stator core, and the first coil, The rotating electrical machine (100, 200, 400), wherein the first coupling portions of the two coils and the third coil are arranged so as to be shifted from each other in the radial direction.   The first coil, the second coil, and the third coil are bent inward in the radial direction of the stator core at a coil end on one side in the axial direction of the stator core, and along the axial direction of the stator core. The rotating electrical machine according to claim 1, wherein the rotating electrical machine is configured to be insertable into the slot from a coil end side on one side in the axial direction of the stator core. The first coil, the second coil, and the third coil are provided between the axial portion and the first connecting portion at a coil end on one side of the stator core in the axial direction. Including bent portions (35, 43, 54, 131, 145, 146, 151),
The first coupling portion of the first coil, the second coil, and the third coil are displaced from each other in the radial direction by making the amount of protrusion of the bent portion inward in the radial direction of the stator core different from each other. The rotating electrical machine according to claim 1, wherein the rotating electrical machine is arranged.   The bent portions of the first coil, the second coil, and the third coil have different shapes and any one of a substantially U shape, a substantially L shape, and a substantially S shape. The rotating electrical machine according to claim 3, comprising: The first coupling portion of the first coil, the second coil, and the third coil includes a wide first surface (f) and a narrow second surface (e) orthogonal to the first surface. Have
The first coupling portion of the first coil, the second coil, and the third coil has a wide first surface facing an axial end surface of the stator core at one end of the stator core in the axial direction. 2. The rotating electrical machine according to claim 1, comprising: the first connecting portion that includes the first connecting portion that faces the axial end surface of the stator core.   The first coil, the second coil, and the third coil are arranged so as to intersect each other without contacting at the coil end on one side in the axial direction of the stator core, so that the first coil, 2. The rotating electrical machine according to claim 1, wherein the first coupling portions of the second coil and the third coil are arranged so as to be displaced from each other in the radial direction.   The first coil, the second coil, and the third coil are bent inward in the radial direction of the stator core at the coil end on one side in the axial direction of the stator core, and at the coil end on the other side, The rotating electrical machine according to claim 1, wherein the rotating electric machine extends along an axial direction of the stator core or is bent outward in a radial direction of the stator core. Each of the first coil, the second coil, and the third coil includes a pair of axial portions (31, 41, 51, 141) extending in the axial direction of the stator core and the pair of axial portions in the axial direction. A second coupling portion (33, 42, 53, 144) coupled at the coil end on the other side of
At least two of the first coil, the second coil, and the third coil are bent outwardly in the radial direction of the stator core at the coil end on the other side in the axial direction of the stator core. The rotating electrical machine according to claim 7, wherein at least two of the second coupling portions of the coil, the second coil, and the third coil are arranged so as to overlap each other in the axial direction.   At least two of the first coil, the second coil, and the third coil of the first coupling portion do not overlap each other when viewed from the axial direction at a coil end on one axial side of the stator core. Thus, the rotating electrical machine according to claim 1, wherein the rotating electrical machines are arranged so as to be displaced from each other in the radial direction. The coil is a band-shaped edgewise coil in which flat conductor wires are wound and laminated,
The first coil, the second coil, and the third coil are bent inward in the radial direction of the stator core along the lamination direction of the rectangular conducting wires, at least at one coil end in the axial direction of the stator core. The rotating electrical machine according to claim 1, wherein the first coupling portions of the first coil, the second coil, and the third coil are arranged so as to be shifted in the radial direction.   At least one of the first coupling portions of the first coil, the second coil, and the third coil is displaced in the axial direction of the stator core with respect to the other first coupling portions. The rotating electrical machine according to claim 1, wherein the rotating electrical machine is disposed at a predetermined position. The first coil, the second coil, and the third coil are provided between the axial portion and the first connecting portion at a coil end on one side of the stator core in the axial direction. Including bent portions (35, 43, 54, 131, 145, 146, 151),
The bent portion of the first coil has a substantially L shape, and the amount of protrusion of the stator core in the radial direction is the smallest,
The bent portion of the second coil has a substantially S shape, and the amount of protrusion of the stator core inward in the radial direction is the largest,
The bent portion of the third coil has a substantially S-shape, and the amount of protrusion of the stator core in the radial direction is larger than the bent portion of the first coil, and the bent portion of the second coil. The rotating electrical machine according to claim 1, which is smaller than a portion.   The first coupling portions of the first coil, the second coil, and the third coil have a radius so as not to overlap each other when viewed from the axial direction at a coil end on one axial side of the stator core. The rotating electrical machine according to claim 12, wherein the rotating electrical machine is arranged so as to be displaced in a direction. The first coil, the second coil, and the third coil are provided between the axial portion and the first connecting portion at a coil end on one side of the stator core in the axial direction. Including bent portions (35, 43, 54, 131, 145, 146, 151),
The first coupling portion of the second coil includes a concave first portion (147a) and a convex second portion (147b).
The rotating electrical machine according to claim 1, wherein the convex second portion of the second coil is disposed so as to straddle the bent portion of the first coil. The coil includes a low speed coil portion (460) used only at a low speed and a low speed coil portion (470) used at both a high speed and a low speed,
The rotating electrical machine according to claim 1, wherein the low-speed coil unit and the low-speed coil unit are configured to be disposed in the common slot. A stator core (1a) having a plurality of slots (11);
A plurality of coils (1b, 101b, 401b) mounted concentrically on the slots of the stator core,
The coil includes a first coil (30, 130), a second coil (40, 140), and a third coil (50, 150) provided corresponding to each phase of three-phase alternating current,
The first coil, the second coil, and the third coil include a pair of axial portions (31, 41, 51, 141) extending in the axial direction of the stator core, and the pair of axial portions as one of the axial directions. A first connecting portion (36, 44, 55, 132, 147, 152) connected at the coil end on the side,
The first coil, the second coil, and the third coil are bent inward in the radial direction of the stator core at a coil end on one axial side of the stator core, and the first coil, The stator for a rotating electrical machine (1, 101, 401), wherein the first coupling portions of the two coils and the third coil are arranged so as to be shifted from each other in the radial direction.   The first coil, the second coil, and the third coil are bent inward in the radial direction of the stator core at a coil end on one side in the axial direction of the stator core, and along the axial direction of the stator core. The stator for a rotating electrical machine according to claim 16, wherein the stator core can be inserted into the slot from a coil end side on one side in the axial direction of the stator core. The first coil, the second coil, and the third coil are provided between the axial portion and the first connecting portion at a coil end on one side of the stator core in the axial direction. Including bent portions (35, 43, 54, 131, 145, 146, 151),
The first coupling portion of the first coil, the second coil, and the third coil are displaced from each other in the radial direction by making the amount of protrusion of the bent portion inward in the radial direction of the stator core different from each other. The stator for a rotating electrical machine according to claim 16, wherein the stator is disposed.   The bent portions of the first coil, the second coil, and the third coil have different shapes and any one of a substantially U shape, a substantially L shape, and a substantially S shape. The stator for a rotating electrical machine according to claim 18, comprising: A vehicle (500) comprising a rotating electrical machine (100, 200, 400),
The rotating electric machine is
A rotor (2);
A stator core (1a) having a plurality of slots (11) and arranged to face the rotor, and a plurality of coils (1b, 101b, 401b) mounted concentrically on the slots of the stator core. A stator (1, 101, 401) provided,
The coil includes a first coil (30, 130), a second coil (40, 140), and a third coil (50, 150) provided corresponding to each phase of three-phase alternating current,
The first coil, the second coil, and the third coil include a pair of axial portions (31, 41, 51, 141) extending in the axial direction of the stator core, and the pair of axial portions as one of the axial directions. A first connecting portion (36, 44, 55, 132, 147, 152) connected at the coil end on the side,
The first coil, the second coil, and the third coil are bent inward in the radial direction of the stator core at a coil end on one axial side of the stator core, and the first coil, The vehicle, wherein the first coupling portion of the two coils and the third coil are arranged so as to be offset from each other in the radial direction.

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