Stator for rotating electric machine and rotating electric machine including the stator
A stator for a rotating electric machine facilitates the assembly of the stator coils and restricts its length in the axial direction. The stator includes a stator iron core having a plurality of teeth and a plurality of stator coils each being wound on one of the teeth. The stator coils include terminal stator coils, each having a crossover wire and a lead wire. Each crossover wire is connected to one of the stator coils of the same phase and each lead wire being is connected to an object other than the stator coils of the same phase. Each end of the crossover wires and the lead wires is disposed at a different level; a first level being the closest to the stator iron core. At least one of the lead wires of the terminal stator coils is disposed at least one level apart within the range of levels.
1. A stator comprising:
a stator iron core including a plurality of teeth; and
a plurality of stator coils each being wound on one of the teeth,
wherein the stator coils include terminal stator coils each having a crossover wire and a lead wire, each crossover wire being to be connected to one of the stator coils of a same phase and each lead wire being to be connected to an object other than the stator coils of the same phase,
wherein each end of the crossover wires and the lead wires is disposed at one of different levels in an axial direction of the stator iron core, a first level of the different levels being closest to the stator iron core, and
wherein at least one of the lead wires of the terminal stator coils is disposed at least one level apart from another lead wire within a range of the different levels.
2. The stator according to claim 1 ,
wherein each end of the crossover wires and the lead wires is disposed at one of three levels in the axial direction of the stator iron core, and
wherein each of the lead wires of the terminal stator coils is disposed at the first level or at a third level of the three levels.
3. The stator according to claim 2 ,
wherein the stator coils include intermediate stator coils each having two crossover wires, each crossover wire being to be connected to one of the stator coils of the same phase, and
wherein each of the crossover wires of the intermediate stator coils is disposed at the first level or at a second level of the three levels.
4. The stator according to claim 3 ,
wherein the lead wire or the crossover wire of each stator coil at the first level is disposed between two virtual lines, each of the virtual lines being drawn from a point of intersection of a side line and a bottom line of one of two adjacent stator coils in a direction of insertion of the stator coil into a tooth.
5. The stator according to claim 4 ,
wherein the lead wires are disposed to extend beyond an outer circumference of the stator iron core.
6. The stator according to claim 5 ,
wherein the ends of the crossover wires of the terminal stator coils and the ends of the crossover wires of the intermediate stator coils are disposed in an outward direction of the stator iron core.
7. The stator according to claim 6 ,
wherein the wind-starting lead wires of the terminal stator coils or the wind-ending lead wires of the terminal stator coils are disposed at a same level with each other.
8. The stator according to claim 7 ,
wherein an order of the phases of the stator coils mounted on the stator iron core is different from the order of the phases of the lead wires disposed in the outward direction of the stator iron core.
9. The stator according to claim 8 ,
wherein the lead wires of the terminal stator coils at the first level are alternate with the lead wires of the terminal stator coils at a level other than the first level in the axial direction of the stator iron core.
10. A rotating electric machine, comprising:
the stator according to claim 8 ; and
a rotor disposed inside the stator with a gap.
11. The stator according to claim 6 , wherein the wind-starting lead wires of the terminal stator coils and the wind-ending lead wires of the terminal stator coils are disposed at a same level with each other.
12. The stator according to claim 11 ,
wherein an order of the phases of the stator coils mounted on the stator iron core is different from the order of the phases of the lead wires disposed in the outward direction of the stator iron core.
13. The stator according to claim 12 ,
wherein the lead wires of the terminal stator coils at the first level are alternate with the lead wires of the terminal stator coils at a level other than the first level in the axial direction of the stator iron core.