Winding for electromagnetic component, stator for rotary electric machine, rotary electric machine, and wheel
The present invention addresses the problem of providing a winding for an electromagnetic component, a stator for a rotary electric machine, a rotary electric machine, and a wheel, which can simplify an assembly step while improving joint quality of a coil end. This winding for electromagnetic components comprises a first conductor ( 3 ) and a second conductor ( 4 ) electrically connected to the first conductor ( 3 ). The first conductor ( 3 ) and the second conductor ( 4 ) are fixed inside an electromagnetic component. At least one among the first conductor ( 3 ) and the second conductor ( 4 ) has a bent section ( 10 ). The first conductor ( 3 ) is pressed against and makes close contact with the second conductor ( 4 ) by a restoring force ( 12 ) due to residual stress of the bent section ( 10 ).
1 . A winding for an electromagnetic component, the winding comprising:
a first conductor; and
a second conductor electrically connected to the first conductor,
wherein
the first conductor is fixed in a first slot in an electromagnetic component and the second conductor is fixed in a second slot in the electromagnetic component, the second slot adjacent to the first slot in a circumferential direction around a periphery of the electromagnetic component,
at least the first conductor has at least a first bent portion, and
the first conductor fixed in the first slot is brought into pressure-contact with the second conductor fixed in the second slot by a restoring force due to a residual stress of the first bent portion of the first conductor, the second slot configured to hold, at least in part, the second conductor in pressure-contact with the first conductor.
2 . A stator for a rotary electric machine including the winding according to claim 1 , wherein
the first conductor having the first bent portion is configured as a first coil and the second conductor is configured as a second coil,
the stator includes:
the electromagnetic component is configured as a core in which the first and second slots are formed around a periphery; and
the first and second coils each having a rectangular cross section are disposed in the first slot and the second slot, respectively,
each of the first and second coils includes:
an insertion portion to be inserted into the slot; and
a connection portion electrically connected to the other the first and second coils; and
at least the first coil having at least the first bent portion includes an intermediate portion formed between the insertion portion and the connection portion,
a connection surface on each coil facing the other the coils in a radial direction of the rotary electric machine is formed on each respective connection portion, and
when viewed from an axial direction of the rotary electric machine, the intermediate portion includes at least the first bent portion, and the first bent portion closest to the insertion portion forms a protrusion toward the connection portion of the second coil.
3 . The stator for a rotary electric machine according to claim 2 , wherein:
when the first coil is fixed in the first slot; and
the second coil is fixed in the second slot adjacent to the first slot in the circumferential direction,
a bend in the bent portion is disposed at a position equidistant from the insertion portion of the first coil and the insertion portion of the second coil, or closer to the insertion portion of the first coil than to the insertion portion of the second coil.
4 . The stator for a rotary electric machine according to claim 2 , wherein
the first coil includes:
the first bent portion formed on a side closer to the insertion portion of the first coil and having a protruding shape protruding in a first direction the second coil; and
a second bent portion formed on a side closer to the insertion portion of the second coil and having a protruding shape protruding in a second direction, opposite to the first direction of the first bent portion.
5 . The stator for a rotary electric machine according to claim 4 , wherein the first bent portion and the second bent portion are formed in a manner that a distance between the first bent portion and the second bent portion is larger than a distance between the first bent portion and the insertion portion of the first coil.
6 . The stator for a rotary electric machine according to claim 4 , wherein the first bent portion and the second bent portion are formed in a manner that a distance between the first bent portion and the second bent portion is larger than a distance between the insertion portion of the second coil and the second bent portion.
7 . The stator for a rotary electric machine according to claim 3 , further comprising a third coil, wherein
the first coil
includes at least the first and second bent portions at different positions in a rotation axis direction of the rotary electric machine, and
is inserted into a first layer of the first slot,
the second coil is inserted into the second slot,
the third coil is inserted into a layer adjacent to the second coil in a radial direction of the rotary electric machine in the second slot into which the second coil is inserted, and
a connection portion of the first coil is located on a same layer as an insertion portion of the third coil and is arranged outside in the rotation axis direction.
8 . The stator for a rotary electric machine according to claim 3 , wherein
a joint portion end surface is configured in a direction substantially perpendicular to a rotation axis of the rotary electric machine, and
a circumferential length of a connection portion of the first coil is longer than a circumferential length of the insertion portion of the second coil.
9 . The stator for a rotary electric machine according to claim 4 , wherein the first bent portion is configured to be substantially parallel to a rotation axis.
10 . A rotary electric machine comprising the stator according to claim 2 .
11 . A wheel comprising the rotary electric machine according to claim 1 .