Three-phase motor
First Claim
1. A three-phase motor having a stator formed by sequentially inserting winding coils of three phases of U-phase, V-phase and W-phase into slots provided on an inner circumferential surface of a stator core, wherein the winding coil of each phase is formed by connecting plural unipolar coils formed by winding electric wires in plural turns, and each of the unipolar coils includes a pair of insertion parts to be inserted into the slots and a pair of coil end parts connecting the pair of insertion parts, and the winding coils of the three phases have the relationships of Cv/Cu<
- 1.0 and Cw/Cv<
1.0, where Cu represents an average length of the electric wires forming the coil end parts of each of the unipolar coils in the winding coil of U-phase, Cv represents an average length of the electric wires forming the coil end parts of each of the unipolar coils in the winding coil of V-phase, and Cw represents an average length of the electric wires forming the coil end parts of each of the unipolar coils in the winding coil of W-phase.
1 Assignment
0 Petitions
Accused Products
Abstract
A three-phase motor having a stator in which the dimensions of protrusion of coil end parts in winding coils of individual phases can be equalized as much as possible and in which the overall dimension of protrusion of the coil end parts in the winding coils of the three phases can be reduced to an optimal dimension is provided. Each of unipolar coils forming the winding coils of the three phases has a pair of coil end parts protruding from end parts in the axial direction of a stator core. The winding coils of the three phases have the relationships of Cv/Cu=0.88 to 0.98 and Cw/Cv=0.88 to 0.98, where Cu, Cv, Cw represent average lengths of electric wires forming the coil end parts in the three phases of U-phase, V-phase and W-phase.
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Citations
20 Claims
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1. A three-phase motor having a stator formed by sequentially inserting winding coils of three phases of U-phase, V-phase and W-phase into slots provided on an inner circumferential surface of a stator core,
wherein the winding coil of each phase is formed by connecting plural unipolar coils formed by winding electric wires in plural turns, and each of the unipolar coils includes a pair of insertion parts to be inserted into the slots and a pair of coil end parts connecting the pair of insertion parts, and the winding coils of the three phases have the relationships of Cv/Cu< - 1.0 and Cw/Cv<
1.0, where Cu represents an average length of the electric wires forming the coil end parts of each of the unipolar coils in the winding coil of U-phase, Cv represents an average length of the electric wires forming the coil end parts of each of the unipolar coils in the winding coil of V-phase, and Cw represents an average length of the electric wires forming the coil end parts of each of the unipolar coils in the winding coil of W-phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- 1.0 and Cw/Cv<
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14. A three-phase motor having a stator formed by inserting winding coils of three phases of U-phase, V-phase and W-phase into slots provided on an inner circumferential surface of a stator core,
wherein the winding coil of each phase has plural unipolar coils formed by winding electric wires in plural turns, a connecting wire for connecting the unipolar coils, and a pair of lead parts formed by leading out the electric wires from unipolar coils situated at both ends of the plural unipolar coils, and each of the unipolar coils includes a pair of insertion parts to be inserted into the slots and a pair of coil end parts connecting the pair of insertion parts, and with respect to average circumferential lengths of the unipolar coils in the winding coils of the three phases, the average circumferential length in the winding coil of V-phase is shorter than the average circumferential length in the winding coil of U-phase, and the average circumferential length in the winding coil of W-phase is shorter than the average circumferential length in the winding coil of V-phase, and the pair of insertion parts of the winding coil of U-phase is inserted in the slots and the pair of coil end parts of the winding coil of U-phase protrudes from end parts in an axial direction of the stator core, and the pair of insertion parts of the winding coil of V-phase is offset from the winding coil of U-phase by a predetermined number of slots in a first direction, which is one circumferential direction of the stator core, as they are inserted in the slots, and the pair of coil end parts of the winding coil of V-phase is partly superposed on an inner circumferential side of the pair of coil end parts of the winding coil of U-phase, and the pair of insertion parts of the winding coil of W-phase is offset from the winding coil of V-phase by a predetermined number of slots in the first direction of the stator core as they are inserted in the slots, and the pair of coil end parts of the winding coil of W-phase is partly superposed on an inner circumferential side of the pair of coil end parts of the winding coil of V-phase.
Specification