Electric vehicle permanent magnet motor with stator and rotor integrated ventilation cooling structure

Abstract

The invention relates to an electric vehicle permanent magnet motor with a stator and rotor integrated ventilation cooling structure, which comprises a casing, a left end cover, a flywheel, a stator core, a winding, a rotor, a bearing and a rotating shaft, and the ventilation cooling structure comprises an air blower, an air inlet, an air outlet, an air gap, a rotating shaft ventilation duct and a stator ventilation duct, air enters the motor from the air inlet by the air blower, respectively enters the casing ventilation opening, the rotor shaft ventilation duct, the air gap and the stator ventilation duct, and then flows out of the motor from the air outlet on the casing to achieve the purpose of circulating cooling, the stator ventilation duct consists of a plurality of welded junctions of the casing and the stator core, and the welded junctions are distributed on the circumference of the stator core; the rotating shaft ventilating duct comprises a through hole formed in the center of the rotating shaft; the machine shell ventilation opening comprises a plurality of fan-shaped holes formed in the connecting face of the machine shell and the bearing.

Description

technical field [0001] The invention belongs to the field of permanent magnet motors for electric vehicles, and in particular relates to a permanent magnet motor for electric vehicles with a stator-rotor integrated ventilation and cooling structure. Background technique [0002] Permanent magnet motors have the advantages of high power density, high efficiency, and wide speed range, and are widely used in the electric vehicle industry. The performance of the motor will directly affect the efficiency of the electric vehicle drive system and the overall work compactness. The high-speed permanent magnet synchronous motor used in electric vehicles has become a trend, and the consequent rotor loss has also greatly increased. While pursuing the reduction of rotor loss, more efficient cooling structures are also required more strongly. In view of the high power density, small size, light weight, high efficiency, and high-speed development trend of the current electric vehicle dri...

AI Technical Summary

Problems solved by technology

At present, there are mainly four types of cooling methods commonly used in the literature: natural air cooling, which does not require additional cooling devices, is economical, and often uses heat dissipation ribs to improve its cooling capacity. However, due to the limited environment of vehicles, The heat dissipation environment is harsh, and the cooling effect achieved is limited; forced air cooling is used, which cools the motor through a fan installed at the non-shaft end of the motor, but it is more suitable for motors with shorter core lengths; oil-cooled or water-cooled Liquid cooling method, high cooling efficiency, design of water circuit for cooling liquid increases the size of the motor

However, the above method has a poor cooling effect on the end of the motor and the permanent magnet, which may easily cause excessive temperature at the end of the motor and overheating of the rotor. The irreversible demagnetization of the permanent magnet will directly threaten the safe and reliable operation of the permanent magnet motor for electric vehicles.

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