Stator and motor
A stator includes star-connected coils of a plurality of phases. Each coil has bodies each configured by connecting conductors in series. Each body is wound while passing alternately through an M-th layer and an (M+1)-th layer of a slot. Each body includes: a first terminal; a first part wave-wound from the first terminal to one side in a circumferential direction; a folded portion connected to the first part on the one side; a second part wave-wound from the folded portion to the other side in the circumferential direction; and a second terminal connected to the second part on the other side. The first parts of the bodies of the same phase are sequentially arranged in slots arranged one by one on the one side. The second parts of the bodies of the same phase are sequentially arranged in slots arranged one by one on the other side.
1 . A stator comprising:
a stator core that has an annular shape centered on a central axis and is provided with a plurality of slots arranged in a circumferential direction; and
phase coil portions mounted on the stator core, wherein each of the phase coil portions is configured to carry a corresponding phase of a plurality of phases, wherein
each of the phase coil portions includes conductor connection bodies configured by connecting a plurality of conductors in series,
each of the conductor connection bodies includes
a plurality of straight portions passing through a corresponding slot of the plurality of slots,
a plurality of curved portions extending across the straight portions on one side in an axial direction of the stator core, and
a plurality of connection portions connecting the conductors to each other on another side in the axial direction of the stator core,
each of the plurality of slots is provided with an even number of layers arranged in a radial direction,
each of the conductor connection bodies is wound by causing a straight portion of the plurality of straight portions arranged in the circumferential direction to alternately pass through an M-th layer of a slot of the plurality of slots and an (M+1)-th layer of the slot of the plurality of slots multiple times with M being an odd natural number, wherein the straight portion has a uniform electrical resistance along an entirety of the straight portion,
each of the conductor connection bodies includes
a first terminal portion,
a first part that is wave-wound from the first terminal portion to one side in the circumferential direction,
a folded portion connected to an end of the first part on the one side in the circumferential direction,
a second part that is wave-wound from the folded portion to another side in the circumferential direction, and
a second terminal portion connected to an end of the second part on the another side in the circumferential direction,
the first parts of the conductor connection bodies of a same phase are sequentially arranged in the slots arranged one by one on the one side in the circumferential direction,
the second parts of conductor connection bodies of the same phase are sequentially arranged in the slots arranged one by one on the another side in the circumferential direction,
the first terminal portion and the second terminal portion extend from an outermost layer of each of the plurality of slots,
the first terminal portions of the conductor connection bodies of a same phase coil portion of the phase coil portions are electrically connected to each other, and
the second terminal portions of the conductor connection bodies of the same phase coil portion the phase coil portions are electrically connected to each other,
wherein the conductor connection bodies include a first conductor connection body and a second conductor connection body,
the first conductor connection body includes:
a first folded conductor, wherein the first folded conductor includes two straight portions arranged in the circumferential direction, and a first folded portion connecting the two straight portions,
the second conductor connection body includes:
a second folded conductor, wherein the second folded conductor includes two straight portions arranged in the circumferential direction, and a second folded portion connecting the two straight portions,
a first slot of the plurality of slots is passed through by a first straight portion connected to a first end of the first folded portion and a second slot passed through by a second straight portion connected to a second end of the first folded portion are separated by seven slots of the plurality of slots,
a third slot passed through by a third straight portion connected to a first end of the second folded portion and a fourth slot slot passed through by a fourth straight portion connected to a second end of the second folded portion are separated by five slots of the plurality of slots,
a circumferential width of the first folded conductor and is different from a circumferential width of the second folded conductor,
in the circumferential direction, the first slot is adjacent to the slot passed through by the straight portion connecting to the first terminal portion, and
in the circumferential direction, the second slot and the slot passed through by the straight portion connected to the second terminal portion are separated by two or more slots.
2 . The stator according to claim 1 , wherein
each of the plurality of slots is provided with four or more layers arranged in the radial direction, and
the conductor connection body
is wound by two or more turns to the one side in the circumferential direction in the first part, and
is wound by a same number of turns as the first part to the another side in the circumferential direction in the second part.
3 . The stator according to claim 2 , wherein the first part and the second part have an interlayer curved portion extending to straddle the (M+1)-th layer and an (M+2)-th layer at a boundary where turns change.
4 . The stator according to claim 1 , wherein in the first part and the second part of the conductor connection body, the plurality of straight portions are arranged in the circumferential direction with a number of slots per pole.
5 . The stator according to claim 1 , wherein
the folded portion includes a bent portion bent from the one side in the circumferential direction to the other side in the circumferential direction, and
the folded portions of the conductor connection bodies of the same phase are arranged to overlap each other in the axial direction, protrude to the one side in the axial direction with respect to the curved portion of another phase, and overlap the curved portion of the other phase on the one side in the axial direction.
6 . The stator according to claim 5 , wherein the folded portions of the conductor connection bodies of the same phase extend in parallel to each other before and after the bent portion.
7 . The stator according to claim 1 , wherein the first terminal portions of the conductor connection bodies of the same phase and the second terminal portions of the conductor connection bodies of the same phase are arranged apart from each other by a number of slots per pole in the circumferential direction.
8 . The stator according to claim 1 , wherein
the first terminal portions of the conductor connection bodies of the same phase are all connected to a phase bus bar, and
the second terminal portions of the conductor connection bodies of the same phase are all connected to a neutral-point bus bar.
9 . The stator according to claim 8 , wherein
the first terminal portions of the conductor connection bodies of the same phase are arranged side by side in the radial direction, and
the second terminal portions of the conductor connection bodies of the same phase are arranged side by side in the radial direction.
10 . The stator according to claim 8 , wherein a radial position of at least one of the neutral-point bus bar and the phase bus bar is located between a radial position of the folded portion and radial positions of the first terminal portion and the second terminal portion.
11 . A motor comprising:
the stator according to claim 1 ; and
a rotor radially opposing the stator.
12 . A stator comprising:
a stator core that has an annular shape centered on a central axis and is provided with a plurality of slots arranged in a circumferential direction; and
phase coil portions mounted on the stator core, wherein each of the phase coil portions is configured to carry a corresponding phase of a plurality of phases, wherein
each of the phase coil portions includes conductor connection bodies configured by connecting a plurality of conductors in series,
each of the conductor connection bodies includes
a plurality of straight portions passing through a corresponding slot of the plurality of slots,
a plurality of curved portions extending across the straight portions on one side in an axial direction of the stator core, and
a plurality of connection portions connecting the conductors to each other on another side in the axial direction of the stator core,
each of the plurality of slots is provided with an even number of layers arranged in a radial direction,
each of the conductor connection bodies is wound by causing a straight portion of the plurality of straight portions arranged in the circumferential direction to alternately pass through an M-th layer of a slot of the plurality of slots and an (M+1)-th layer of the slot of the plurality of slots multiple times with M being an odd natural number,
each of the conductor connection bodies includes
a first terminal portion,
a first part that is wave-wound from the first terminal portion to one side in the circumferential direction,
a folded portion connected to an end of the first part on the one side in the circumferential direction,
a second part that is wave-wound from the folded portion to another side in the circumferential direction, and
a second terminal portion connected to an end of the second part on the another side in the circumferential direction,
the first parts of the conductor connection bodies of a same phase are sequentially arranged in the slots arranged one by one on the one side in the circumferential direction,
the second parts of conductor connection bodies of the same phase are sequentially arranged in the slots arranged one by one on the another side in the circumferential direction,
the first terminal portion and the second terminal portion extend from an outermost layer of each of the plurality of slots,
the first terminal portions of the conductor connection bodies of a same phase coil portion of the phase coil portions are electrically connected to each other, and
the second terminal portions of the conductor connection bodies of the same phase coil portion the phase coil portions are electrically connected to each other, wherein
each of the plurality of slots is provided with four or more layers arranged in the radial direction, and
the conductor connection body
is wound by two or more turns to the one side in the circumferential direction in the first part, and
is wound by a same number of turns as the first part to the another side in the circumferential direction in the second part,
wherein the first part and the second part have an interlayer curved portion extending to straddle the (M+1)-th layer and an (M+2)-th layer at a boundary where turns change, wherein at least one of the first terminal portions or the second terminal portions, a curved portion of the plurality of curved portions, the folded, and the interlayer curved portion has a different shape from one another,
wherein the conductor connection bodies include a first conductor connection body and a second conductor connection body,
the first conductor connection body includes:
a first folded conductor, wherein the first folded conductor includes two straight portions arranged in the circumferential direction, and a first folded portion connecting the two straight portions,
the second conductor connection body includes:
a second folded conductor, wherein the second folded conductor includes two straight portions arranged in the circumferential direction, and a second folded portion connecting the two straight portions,
a first slot of the plurality of slots is passed through by a first straight portion connected to a first end of the first folded portion and a second slot passed through by a second straight portion connected to a second end of the first folded portion are separated by seven slots of the plurality of slots,
a third slot passed through by a third straight portion connected to a first end of the second folded portion and a fourth slot passed through by a fourth straight portion connected to a second end of the second folded portion are separated by five slots of the plurality of slots,
a circumferential width of the first folded conductor and is different from a circumferential width of the second folded conductor,
in the circumferential direction, the first slot is adjacent to the slot passed through by the straight portion connecting to the first terminal portion, and
in the circumferential direction, the second slot and the slot passed through by the straight portion connected to the second terminal portion are separated by two or more slots.
13 . The stator according to claim 12 , wherein in the first part and the second part of the conductor connection body, the plurality of straight portions are arranged in the circumferential direction with a number of slots per pole.
14 . The stator according to claim 12 , wherein
the folded portion includes a bent portion bent from the one side in the circumferential direction to the other side in the circumferential direction, and
the folded portions of the conductor connection bodies of the same phase are arranged to overlap each other in the axial direction, protrude to the one side in the axial direction with respect to the curved portion of another phase, and overlap the curved portion of the other phase on the one side in the axial direction.
15 . The stator according to claim 14 , wherein the folded portions of the conductor connection bodies of the same phase extend in parallel to each other before and after the bent portion.
16 . The stator according to claim 12 , wherein the first terminal portions of the conductor connection bodies of the same phase and the second terminal portions of the conductor connection bodies of the same phase are arranged apart from each other by a number of slots per pole in the circumferential direction.
17 . The stator according to claim 12 , wherein
the first terminal portions of the conductor connection bodies of the same phase are all connected to a phase bus bar, and
the second terminal portions of the conductor connection bodies of the same phase are all connected to a neutral-point bus bar.
18 . The stator according to claim 17 , wherein
the first terminal portions of the conductor connection bodies of the same phase are arranged side by side in the radial direction, and
the second terminal portions of the conductor connection bodies of the same phase are arranged side by side in the radial direction.
19 . A motor comprising:
the stator according to claim 12 ; and
a rotor radially opposing the stator.
20 . The stator according to claim 12 , wherein the interlayer curved portion comprises:
a first diagonal member extending in a first direction;
a second diagonal member extending in a second direction different from the first direction, and
a straight portion connecting the first diagonal member to the second diagonal member, wherein the straight portion extends in a third direction different from each of the first direction and the second direction.