Motor with cooling structure
AssigneeNissan Motor Co., Ltd.
InventorMasaki Nakano
Life of this patent
Estimating the term…
Abstract
In a motor having a cylindrical stator fixed to a motor housing and inner and outer rotors concentrically arranged to the stator, a cooling structure of the motor includes cooling jackets formed in the stator. Coolant inlet and outlet ports are provided at an axial end of the rotor which end is opposite to an output end portion of the outer rotor. The coolant inlet and outlet ports are connected to the cooling jackets to supply and discharge coolant to and from the cooling jackets. A coolant return portion is provided at the other axial end of the rotor and connects each pair of the cooling jackets.
Claims19
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;
- and
- a 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.
A cooling system of a multi-layer motor, the multi-layer motor comprising a motor housing, a cylindrical stator fixed to the motor housing, an outer rotor rotatably installed around said stator and an inner rotor rotatably installed inside said stator, said cooling system comprising:
- means defining a plurality of cooling jackets for flowing coolant to cool the stator;
- means defining a coolant inlet port for said cooling jackets, said coolant inlet port defining means being disposed at an axial end of the stator, said coolant inlet port defining means being nearer than said cooling jacket defining means to a rotational axis of the inner rotor;
- means defining a coolant outlet port for said cooling jackets, said coolant outlet port defining means being disposed at the axial end of the stator which end is the same as that of said coolant inlet port;
- and
- means defining a coolant return portion for connecting a pair of said cooling jacket defining means at the other axial end of the stator.
Dependencies are inferred from the claim text.