Patent Application
20220037945
The present invention relates to a rotary electric machine stator.
As a kind of rotary electric machine stator, a segment conductor (SC) wound stator is known. The SC wound stator includes a stator core having slots, a basic coil wound around the stator core, and a power coil connected to the basic coil. The basic coil is wound around the stator core by an SC winding method. The SC winding method is a method in which a plurality of basic coil segments formed by segment conductors (split conductors) is inserted into slots of the stator core, and then adjacent basic coil segments are welded to wind the basic coil around the stator core. The power coil includes power coil segments, and the power coil segments are formed by segment conductors as well. The power coil segments are inserted into slots of the stator core and welded to the basic coil segment. Patent Literature 1 discloses an example of the SC wound stator having a conductor as a basic coil segment and a lead section as a power coil segment.
In manufacturing the SC wound stator, each of the basic coil segments and power coil segments is inserted into a slot from an insertion end with the insertion end of the slot facing upward. After each of the basic coil segments and power coil segments is inserted into the slot, the stator core is inverted up and down so that a welded end of the slot faces upward. The basic coil segment and the power coil segment arranged outside the welded ends of the slots are bent with the welded ends of the slots facing upward. After the bending, welding of adjacent basic coil segments and welding of a basic coil segment and a power coil segment are performed, on the welded end side of the slots.
The bending is performed while the stator core is supported by a support surface of a support member. The stator core is supported by the support member via at least the basic coil segments or the power coil segments, arranged outside the insertion ends of the slots. While the stator core is supported by the support member, a bending tool applies a circumferential force to each of the basic coil segments and power coil segments, arranged outside the welded end of the slot. Thus, the basic coil segments and the power coil segments are bent.
Patent Literature 1: JP 2011-015459 A
If the bending tool applies a force to the basic coil segments and power coil segments that are being supported unevenly by the support member, there is a possibility that at least some of the basic coil segments and power coil segments are displaced in position, in an axial direction in parallel to a center axis of the stator core. For example, if the position of one of adjacent basic coil segments is displaced, the adjacent basic coil segments which are not aligned with each other will be welded. The welding adjacent basic coil segments which are not aligned with each other may cause low welding quality and reduced productivity of the rotary electric machine stator.
An object of an aspect of the present invention is to suppress a decrease in productivity of a rotary electric machine stator.
According to an aspect of the present invention, a rotary electric machine stator comprises: a stator core that includes a slot having an insertion end and a welded end; a basic coil segment that includes a pair of basic coil insertion end portions and a basic coil bent portion arranged between the pair of basic coil insertion end portions; and a power coil segment that includes a power coil insertion end portion, a power coil lead end portion, and a power coil connection portion arranged between the power coil insertion end portion and the power coil lead end portion, wherein the basic coil segment is arranged in the slot such that at least part of the basic coil bent portion is arranged outside the insertion end, in an axial direction parallel to a center axis of the stator core, and the pair of the basic coil insertion end portions is arranged outside the welded end, in the axial direction, the power coil segment is arranged in the slot such that the power coil lead end portion and at least part of the power coil connection portion are arranged outside the insertion end, in the axial direction, and the power coil insertion end portion is arranged outside the welded end, in the axial direction, and a height of an end surface of the basic coil segment from the insertion end is equal to a height of an end surface of the power coil segment from the insertion end.
According to an aspect of the present invention, it is possible to suppress a decrease in the productivity of the rotary electric machine stator.
Embodiments according to the present invention will be described below with reference to the drawings, but the present invention is not limited thereto. Component elements of the embodiments described below may be appropriately combined with each other. Furthermore, some of the component elements may not be used.
[Rotary Electric Machine]
The rotary electric machine rotor 2 includes a rotor core 5 and a permanent magnet 6 that is supported by the rotor core 5. The rotary electric machine stator 3 includes a stator core 7, a basic coil 8 that is wound around the stator core 7, and a power coil 9 that is connected to the basic coil 8. The power coil 9 is connected to a power line 10. Note that the rotary electric machine rotor 2 may not have the permanent magnet 6. An example of a type of motor with no permanent magnet 6 includes at least one of a switched reluctance motor and an induction motor.
The power line 10 is connected to each of a generator 102 and a power storage device 104 via an inverter 101. The generator 102 is connected to an engine 103. The generator 102 generates electric power by driving the engine 103. The power storage device 104 stores electric power. Examples of the power storage device 104 include capacitors, such as electric double-layer capacitors or lithium ion capacitors, and storage batteries, such as lead storage batteries and lithium-ion batteries.
The rotary electric machine 1 functions as an electric motor and a generator. When the rotary electric machine 1 functions as the electric motor, electric power generated by the generator 102 is supplied to the rotary electric machine stator 3 via the inverter 101 and the power line 10. In response to the supplying power to the rotary electric machine stator 3, the rotary electric machine rotor 2 rotates. The rotation of the rotary electric machine rotor 2 rotates the object 100. When the rotary electric machine 1 functions as the generator, a rotational energy of the object 100 is input to the rotary electric machine rotor 2. In response to input of the rotational energy of the object 100 to the rotary electric machine rotor 2, the rotary electric machine 1 generates electric power. The electric power generated by the rotary electric machine 1 is stored in the power storage device 104 via the power line 10 and the inverter 101.
The rotary electric machine 1 has a three-phase synchronous motor. The basic coil 8 includes a U-phase basic coil 8U, a V-phase basic coil 8V, and a W-phase basic coil 8W. The power coil 9 includes a U-phase power coil 9U, a V-phase power coil 9V, and a W-phase power coil 9W. The power line 10 includes a U-phase power line 10U, a V-phase power line 10V, and a W-phase power line 10W.
[Rotary Electric Machine Stator]
The stator core 7 has a substantially cylindrical shape. The stator core 7 has a center axis AX that coincides with the center axis of the rotary electric machine stator 3. In the following description, a direction parallel to the center axis AX of the stator core 7 is appropriately referred to as an axial direction, a rotation direction around the center axis AX is appropriately referred to as a circumferential direction, and a radial direction with respect to the center axis AX is appropriately referred to as a radial direction. Furthermore, a direction or position away from the center axis AX in a radial direction is appropriately referred to as radially outward or radial outside, and a direction or position approaching the center axis AX in a radial direction is appropriately referred to as radially inward or radial inside.
The stator core 7 has an inner peripheral surface 7S, an outer peripheral surface 7T, a first end surface 7A, and a second end surface 7B. The inner peripheral surface 7S faces the center axis AX. The outer peripheral surface 7T faces in the opposite direction to the inner peripheral surface 7S. The first end surface 7A connects one end portion of the inner peripheral surface 7S and one end portion of the outer peripheral surface 7T, in the axial direction. The second end surface 7B connects the other end of the inner peripheral surface 7S and the other end of the outer peripheral surface 7T in the axial direction.
A plurality of the slots 13 is provided in the inner peripheral surface 7S in the circumferential direction. Each of the slots 13 is recessed radially outward from the inner peripheral surface 7S. Between adjacent slots 13 in the circumferential direction, a tooth 14 of the stator core 7 is arranged.
The slot 13 extends in the axial direction. The slot 13 has an insertion end 13A and a welded end 13B, as illustrated in
The basic coil 8 includes a plurality of basic coil segments 15. The basic coil 8 is wound around the stator core 7 by an SC winding method. The SC winding method is a method in which the plurality of basic coil segments 15 formed by segment conductors (split conductors) is inserted into the slots 13 of the stator core 7, and then adjacent basic coil segments 15 are welded to wind the basic coil 8 around the stator core 7.
A plurality of basic coil segments 15 forms the U-phase basic coil 8U. A plurality of basic coil segments 15 forms the V-phase basic coil 8V. A plurality of basic coil segments 15 forms the W-phase basic coil 8W.
The power coil 9 includes a plurality of power coil segments 16 formed by segment conductors. A pair of power coil segments 16 forms the U-phase power coil 9U. A pair of power coil segments 16 forms the V-phase power coil 9V. A pair of power coil segments 16 forms the W-phase power coil 9W.
The power line 10 includes the U-phase power line 10U that is connected to the U-phase power coil 9U, the V-phase power line 10V that is connected to the V-phase power coil 9V, and the W-phase power line 10W that is connected to the W-phase power coil 9W.
The neutral line 17 includes a U-phase neutral line 17U that is connected to the U-phase basic coil 8U, a V-phase neutral line 17V that is connected to the V-phase basic coil 8V, and a W-phase neutral line 17W that is connected to the W-phase basic coil 8W.
[Rectangular Wire]
The conductor 21 may have a square cross-sectional shape. Furthermore, the rectangular wire 20 (insulating film 22) may have a square cross-sectional shape.
Each of the basic coil segment 15 and the power coil segment 16 is formed from the rectangular wire 20. The basic coil segment 15 (basic coil 8) is formed from the rectangular wire 20, and thereby, the coil space factor in the rotary electric machine stator 3 is improved. The coil space factor represents a proportion of the conductor 21 in a cross-section of the rotary electric machine stator 3. The improved coil space factor makes it possible to reduce the size of the rotary electric machine 1 and increase the output therefrom.
[Basic Coil Segment]
As illustrated in
The basic coil insertion end portions 31 include a first basic coil insertion end portion 31A and a second basic coil insertion end portion 31B. The basic coil bent portion 32 includes a first basic coil bent portion 32A, a second basic coil bent portion 32B, and a third basic coil bent portion 32C.
The basic coil segment 15 has a pair of basic coil straight portions 33 each of which includes the basic coil insertion end portion 31, and a pair of basic coil curved portions 34. The basic coil straight portions 33 include a first basic coil straight portion 33A that includes the first basic coil insertion end portion 31A and a second basic coil straight portion 33B that includes the second basic coil insertion end portion 31B. The basic coil curved portions 34 include a first basic coil curved portion 34A and a second basic coil curved portion 34B. The first basic coil straight portion 33A is connected to the first basic coil curved portion 34A via the first basic coil bent portion 32A. The first basic coil curved portion 34A is connected to the second basic coil curved portion 34B via the second basic coil bent portion 32B. The second basic coil curved portion 34B is connected to the second basic coil straight portion 33B via the third basic coil bent portion 32C.
When viewed in the axial direction, the first basic coil curved portion 34A and the second basic coil curved portion 34B are curved in the circumferential direction. The first basic coil curved portion 34A and the second basic coil curved portion 34B are connected at the second basic coil bent portion 32B. The second basic coil curved portion 34B is arranged at a position displaced from the first basic coil curved portion 34A in the radial direction. When viewed in the radial direction, the first basic coil curved portion 34A extends substantially obliquely from the first end surface 7A toward the second basic coil bent portion 32B. The second basic coil curved portion 34B extends substantially obliquely from the second basic coil bent portion 32B toward the first end surface 7A.
The first basic coil straight portion 33A and the second basic coil straight portion 33B are substantially parallel to each other. The first basic coil insertion end portion 31A and the second basic coil insertion end portion 31B face in the same direction.
The basic coil segment 15 includes the conductor 21 and the insulating film 22 that at least partially covers the surface of the conductor 21. Each of the basic coil straight portions 33 including the basic coil insertion end portion 31 has a portion formed as a conductor exposed portion 23 in which the surface of the conductor 21 is not covered with the insulating film 22.
[Power Coil Segment]
As illustrated in
The power coil connection portion 43 includes a first power coil straight portion 44, a second power coil straight portion 45, and a power coil curved portion 48. The first power coil straight portion 44 is connected to the power coil curved portion 48 via a first power coil bent portion 46. The power coil curved portion 48 is connected to the second power coil straight portion 45 via a second power coil bent portion 47.
The power coil segment 16 includes the conductor 21 and the insulating film 22 that at least partially covers the surface of the conductor 21. The first power coil straight portion 44 including the power coil insertion end portion 41 has a portion formed as a conductor exposed portion 24 in which the surface of the conductor 21 is not covered with the insulating film 22. The second power coil straight portion 45 including the power coil lead end portion 42 has a portion formed as a conductor exposed portion 25 in which a surface of the conductor 21 is not covered with the insulating film 22.
[Relationships of Basic Coil Segment and Power Coil Segment to Stator Core]
In insertion of the basic coil segment 15 into the slot 13, the basic coil insertion end portion 31 of the basic coil segment 15 is inserted into the slot 13 from the insertion end 13A with the insertion end 13A of the slot 13 facing upward. The basic coil segment 15 is moved in the axial direction until the basic coil insertion end portion 31 is arranged axially outward from the welded end 13B of the slot 13. The basic coil segment 15 moves in the axial direction, and thereby the first end surface 7A and at least part of the basic coil bent portion 32 come into contact with each other. The at least partial contact between the first end surface 7A and the basic coil bent portion 32 restricts movement of the basic coil segment 15 in the axial direction. At least part of the basic coil segment 15 between the basic coil insertion end portions 31 and the basic coil bent portion 32 is arranged within the slot 13, and the basic coil bent portion 32 is arranged axially outward from the insertion end 13A of the slot 13 with the basic coil insertion end portions 31 arranged axially outward from the welded end 13B of the slot 13. In other words, the basic coil segment 15 is arranged in the slot 13 so that at least part of the basic coil bent portion 32 is arranged axially outward from the insertion end 13A and the pair of basic coil insertion end portions 31 are arranged axially outward from the welded end 13B.
In insertion of the power coil segment 16 into the slot 13, the power coil insertion end portion 41 of the power coil segment 16 is inserted into the slot 13 from the insertion end 13A with the insertion end 13A of the slot 13 facing upward. The power coil segment 16 is moved in the axial direction until the power coil insertion end portion 41 is arranged axially outward from the welded end 13B of the slot 13. The power coil segment 16 moves in the axial direction, and thereby the first end surface 7A and at least part of the power coil connection portion 43 come into contact with each other. The contact between the first end surface 7A and the at least part of the power coil connection portion 43 restricts movement of the power coil segment 16 in the axial direction. At least part of the power coil segment 16 between the power coil insertion end portion 41 and the power coil connection portion 43 is arranged within the slot 13, and the power coil connection portion 43 and the power coil lead end portion 42 are arranged outward from the insertion end 13A of the slot 13 with the power coil insertion end portion 41 arranged axially outward from the welded end 13B of the slot 13. In other words, the power coil segment 16 is arranged in the slot 13 so that the power coil lead end portion 42 and at least part of the power coil connection portion 43 are arranged axially outward from the insertion end 13A and the power coil insertion end portion 41 is arranged axially outward from the welded end 13B.
Note that
[Relationship Between Basic Coil Segment and Power Coil Segment]
As described above, in a process of inserting the basic coil segment 15 into the slot 13, the basic coil segment 15 is moved in the axial direction, until the first end surface 7A and at least part of the basic coil bent portion 32 make contact with each other to restrict the movement of the basic coil segment 15 in the axial direction. Likewise, in a process of inserting the power coil segment 16 into the slot 13, the power coil segment 16 is moved in the axial direction, until the first end surface 7A and at least part of the power coil connection portion 43 make contact with each other to restrict the movement of the power coil segment 16 in the axial direction.
As illustrated in
The end surface 15T of the basic coil segment 15 represents a portion of the surface of the basic coil segment 15 that is farthest from the first end surface 7A of the stator core 7 in the axial direction. The end surface 16T of the power coil segment 16 represents a portion of the surface of the power coil segment 16 that is farthest from the first end surface 7A of the stator core 7 in the axial direction.
The plurality of end surfaces 15T which is equal in height also includes the plurality of end surfaces 15T that is not only completely equal in height but also substantially equal in height. The plurality of end surfaces 15T which is substantially equal in height includes the plurality of end surfaces 15T that has a displacement amount therebetween in height being half or less of a dimension of the short side 20H of the rectangular wire 20.
The fact that the end surface 15T and the end surface 16T are equal in height includes the fact that the end surface 15T and the end surface 16T are not only completely equal in height but also substantially equal in height. The fact that the end surface 15T and the end surface 16T are substantially equal in height includes a state in which the end surface 15T and the end surface 16T have a displacement amount therebetween in height being half or less of the dimension of the short side 20H of the rectangular wire 20.
Note that in a case where the rectangular wire 20 has a square cross-section, the fact that the plurality of end surfaces 15T is substantially equal in height includes a state in which the plurality of end surfaces 15T has a displacement amount therebetween in height being half or less of a dimension of one side of the cross-section of the rectangular wire 20. The fact that the end surface 15T and the end surface 16T are substantially equal in height includes a state in which the end surface 15T and the end surface 16T have a displacement amount therebetween in height being half or less of the dimension of one side of the cross-section of the rectangular wire 20.
Note that the fact that the plurality of end surfaces 15T is equal in height essentially includes a state in which the plurality of end surfaces 15T can simultaneously make contact with a support surface 51 of a support member 50, which is described later, when the plurality of basic coil segments 15 inserted in the slots 13 faces the support surface 51.
Note that the fact that the end surface 15T and the end surface 16T are equal in height essentially includes a state in which the end surface 15T and the end surface 16T can simultaneously make contact with the support surface 51 of the support member 50 described later, when the basic coil segment 15 and power coil segment 16 that are inserted into the slots 13 face the support surface 51.
[Relationship Between Power Coil Segment and Stator Core]
At least part of the first power coil straight portion 44 of the power coil segment 16 is arranged in the slot 13. As illustrated in
Furthermore, when at least part of the first power coil straight portion 44 is arranged in the slot 13, the height of the second power coil bent portion 47 from the insertion end 13A is equal to the height of the power coil lead end portion 42 from the insertion end 13A. In other words, the second power coil straight portion 45 extends radially outward so as to be orthogonal to the center axis AX.
Furthermore, the power coil lead end portion 42 is arranged outside the basic coil segment 15 in the radial direction with respect to the center axis AX.
Furthermore, in the radial direction with respect to the center axis AX, a distance Ra from the center axis AX to the power coil lead end portion 42 is smaller than the maximum value of a distance Rb from the center axis AX to the outer peripheral surface 7T of the stator core 7. In other words, the power coil segment 16 is arranged so that the power coil lead end portion 42 does not protrude radially outward from the outer peripheral surface 7T of the stator core 7.
The plurality of (six) power coil segments 16 is spaced from each other in the circumferential direction around the center axis AX. In the radial direction with respect to the center axis AX, the distance Ra from the center axis AX to the power coil lead end portion 42 of a first power coil segment 16 is equal to the distance Ra from the center axis AX to the power coil lead end portion 42 of a second power coil segment 16 adjacent to the first power coil segment 16. In other words, each of the distance Ra from the center axis AX to each of the power coil lead end portions 42 of the plurality of the power coil segments 16 is equal.
[Production Method]
The basic coil segment 15 is inserted into the slot 13 from the basic coil insertion end portion 31. After the basic coil insertion end portion 31 is inserted into the insertion end 13A, the basic coil segment 15 moves in the axial direction, and thereby the first end surface 7A makes contact with at least part of the basic coil bent portion 32. The movement of the basic coil segment 15 in the axial movement is restricted by the contact between the first end surface 7A and the at least part of the basic coil bent portion 32. When the first end surface 7A is in contact with the at least part of the basic coil bent portion 32, the basic coil insertion end portion 31 is arranged outside the welded end 13B of the slot 13.
The power coil segment 16 is inserted into the slot 13 from the power coil insertion end portion 41 thereof. After the power coil insertion end portion 41 is inserted into the insertion end 13A, the power coil segment 16 moves in the axial direction, and thereby the first end surface 7A makes contact with at least part of the power coil connection portion 43. The contact between the first end surface 7A and the at least part of the power coil connection portion 43 restricts movement of the power coil segment 16 in the axial direction. When the first end surface 7A is in contact with the at least part of the power coil connection portion 43, the power coil insertion end portion 41 is arranged axially outward from the welded end 13B of the slot 13.
Each of the basic coil segment 15 and power coil segment 16 is manufactured so that the height of the end surface 15T from the insertion end 13A is equal to the height of the end surface 16T from the insertion end 13A with the axial movement of each of the basic coil segment 15 and power coil segment 16 restricted in the slot 13.
Each of
As illustrated in
At least part of the basic coil segments 15 and at least part of the power coil segment 16 are arranged below the insertion ends 13A. Supporting the stator core 7 by the support surface 51 includes bringing the basic coil segments 15 and the power coil segment 16 arranged below the insertion ends 13A into contact with the support surface 51.
The height of the end surface 15T of each of the basic coil segments 15 from the insertion end 13A is equal to the height of the end surface 16T of the power coil segment 16 from the insertion end 13A, the basic coil segment 15 and the power coil segment 16 being arranged below the insertion ends 13A. Furthermore, the support surface 51 is a flat surface. Therefore, it is possible for both of the end surface 15T of the basic coil segment 15 and the end surface 16T of the power coil segment 16 to make contact with the support surface 51 simultaneously.
The expansion process is performed while the basic coil segment 15 and the power coil segment 16 that protrude downward from the insertion ends 13A of the slots 13 are supported by the support surface 51 of the support member 50.
As illustrated in
The expansion process is performed with both the end surface 15T and the end surface 16T making contact with the support surface 51. In other words, the tool 52 used for the expansion process applies a force downward from above, to the basic coil segment 15 and the power coil segment 16, with the basic coil segment 15 and the power coil segment 16 evenly supported by the support member 50. When the tool 52 applies an axial force to the basic coil segment 15 and the power coil segment 16, both the end surface 15T and the end surface 16T are in contact with the support surface 51, thereby suppressing axial displacement of at least one of the basic coil segment 15 and the power coil segment 16 relative to the slot 13, in the expansion process.
After the diameter expansion process is finished, the twisting process is performed. As in the expansion process, the twisting process is performed while the welded ends 13B of the slots 13 face upward and the insertion ends 13A of the slots 13 face downward. Furthermore, as in the expansion process, the twisting process is performed while the basic coil segment 15 and the power coil segment 16 that protrude downward from the insertion ends 13A of the slots 13 are supported by the support surface 51 of the support member 50. Note that the support member 50 used in the expansion process and the support member 50 used in the twisting process may be the same support member or different support members.
As illustrated in
As in the expansion process, the twisting process is performed with both the end surface 15T and the end surface 16T making contact with the support surface 51. In other words, the tool 53 used for the twisting process applies a force downward from above, to the basic coil segment 15 and the power coil segment 16, with the basic coil segment 15 and the power coil segment 16 evenly supported by the support member 50. When the tool 53 applies an axial force to the basic coil segment 15 and the power coil segment 16, both the end surface 15T and the end surface 16T are in contact with the support surface 51, thereby suppressing axial displacement of at least one of the basic coil segment 15 and the power coil segment 16 relative to the slot 13, also in the twisting process.
As illustrated in
[Basic Coil and Power Coil]
As illustrated in
One basic coil insertion end portion 31 of the basic coil segment 151 and the other basic coil insertion end portion 31 of the basic coil segment 152 are welded together. One basic coil insertion end portion 31 of the basic coil segment 152 and the other basic coil insertion end portion 31 of the basic coil segment 153 are welded together.
One basic coil insertion end portion 31 of the basic coil segment 154 and the other basic coil insertion end portion 31 of the basic coil segment 155 are welded together. One basic coil insertion end portion 31 of the basic coil segment 155 and the other basic coil insertion end portion 31 of the basic coil segment 156 are welded together.
The other basic coil insertion end portion 31 of the basic coil segment 151 and one basic coil insertion end portion 31 of the basic coil segment 157 are welded together. One basic coil insertion end portion 31 of the basic coil segment 156 and the other basic coil insertion end portion 31 of the basic coil segment 157 are welded together. The first continuous coil unit and the second continuous coil unit are connected via the basic coil segment 157.
The power coil insertion end portion 41 of the power coil segment 16 is welded to the basic coil insertion end portion 31 of the basic coil segment 151.
The current supplied to the power coil lead end portion 42 of the power coil segment 16 passes through the power coil segment 16 and then sequentially passes through the basic coil segment 151, the basic coil segment 152, and the basic coil segment 151. The current flowing through the basic coil segment 151 is supplied to the basic coil segment 157. The current flowing through the basic coil segment 157 sequentially flows through the basic coil segment 154, the basic coil segment 155, and the basic coil segment 156.
As in the U-phase basic coil 8U illustrated in
[Connection Structure Between Power Coil Segment and Power Line]
As illustrated in
As described above, when each of the basic coil segment 15 and power coil segment 16 is being inserted into the slot 13, the end surface 15T of the basic coil segment 15 and the end surface 16T of the power coil segment 16 are arranged outside the insertion ends 13A, and the height of the end surface 15T from the insertion end 13A is equal to the height of the end surface 16T from the insertion end 13A. Therefore, as described with reference to
As described with reference to
Furthermore, as described with reference to
When the plurality of power coil segments 16 is arranged at intervals in the circumferential direction, the distances Ra from the center axis AX to the power coil lead end portions 42 of the plurality of power coil segments 16 are equal to each other. This configuration makes the electrical characteristics of the plurality of power coils 9, such as electric resistance, uniform, and thus, a reduction in performance of the rotary electric machine 1 is suppressed.
As described with reference to
Furthermore, the power coil curved portion 48 extends in the circumferential direction around the center axis AX and the second power coil straight portion 45 extends radially outward with respect to the center axis AX, thereby suppressing an increase in size of the rotary electric machine stator 3 in the axial direction.
The height of the second power coil bent portion 47 from the insertion end 13A is equal to the height of the power coil lead end portion 42 from the insertion end 13A. This configuration makes it possible to bring the entire second power coil straight portion 45 into contact with the support surface 51, in bending, and thus, the contact area between the power coil segment 16 and the support surface 51 of the support member 50 can be increased and the rotary electric machine stator 3 is stably supported by the support surface 51. Furthermore, the second power coil straight portion 45 is arranged so as to extend in the radial direction with respect to the center axis AX, thus suppressing a reduction in workability of welding the power coil lead end portion 42 and the power line 10. For example, when the power coil lead end portion 42 and the power line 10 are welded while rotating the stator core 7 around the center axis AX, the power coil lead end portion 42 and the power line 10 are smoothly welded.
As described with reference to
Note that in the above-described embodiment, the respective neutral lines 17 project axially from the end surfaces 15T and the end surfaces 16T. In this case, the support surface 51 of the support member 50 is provided with recessed portions for arrangement of the neutral lines 17, and thereby the end surfaces 15T and the end surfaces 16T are brought into contact with the support surface 51 simultaneously. The axial position of each end surface 15T is equal to the axial position of each end surface 16T, and thus, only a recessed portion for arrangement of each neutral line 17 is preferably provided in the support surface 51 of the support member 50. Therefore, the size of each recessed portion and the number of the recessed portions, provided in the support surface 51 are sufficiently suppressed, and the rotary electric machine stator 3 is stably supported by the support member 50 in the bending process. Furthermore, the size of each recessed portion and the number of the recessed portions, provided in the support surface 51 are sufficiently suppressed, thus, suppressing complication of positioning work when the rotary electric machine stator 3 is supported by the support member 50.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2018-205852 | Oct 2018 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2019/041548 | 10/23/2019 | WO | 00 |
