Patent ID: 6114784
Filing Date: 2000-09-05
Classification: B60K,B60L,F04C,H02K,Y02T

Abstract:
A motor with a cooling structure, comprising:a motor housing;a stator of a cylindrical shape fixed to said motor housing;an outer rotor rotatably installed around said stator;an inner rotor rotatably installed inside said stator, said inner rotor, said stator and the said outer rotor being concentrically arranged;a plurality of pairs of cooling jackets formed in said stator;a coolant inlet port and a coolant outlet port provided in the vicinity of an axial end of said inner rotor which end is opposite to an output end portion of said outer rotor, said coolant inlet and outlet ports being connected to said cooling jackets to supply and discharge coolant to and from said cooling jackets, said coolant inlet port being nearer than said cooling jackets to a rotational axis of said inner rotor; anda coolant return portion provided in the vicinity of the other axial end of said inner rotor, said coolant return portion connecting each pair of said cooling jackets.