Patent ID: 9178395
Filing Date: 2015-11-03
Classification: H02K,Y02T

Abstract:
1. A traction motor for an electric vehicle, comprising a stator and a rotor rotatably mounted to the stator, wherein the rotor comprises a rotor core and magnets fixed to the rotor core, the rotor core having 2P rotor poles formed by the magnets, P being an integer larger than one, wherein the stator comprises a stator core having a plurality of teeth and a plurality of field windings wound on the teeth, the field windings forming m phases, m being an integer, the number of the teeth of the stator core being equal to 3·m·P, wherein the field windings of each phase comprises P winding units arranged in a circumferential direction of the motor in turns, each of the winding units comprising a first coil wound on a first set of teeth, and a second coil wound on a second set of teeth and connected with the first coil in series, the first set of teeth comprising all the second set of teeth and at least one another tooth, the first coil having a larger coil pitch and a greater number of turns compared with the second coil, and the first coil being wound before the second coil.