Direct cooling system applied to rotor and winding of high-speed permanent magnet motor

Abstract

The invention relates to a direct cooling system applied to a rotor and a winding of a high-speed permanent magnet motor. Cooling liquid enters from a hollow cavity of a rotating shaft, passes through a rotating shaft guide hole under the rotating centrifugal effect of the rotor and flows into an area formed by the end face of the end plate and a rotor core; the area formed by the end face and the rotor core is communicated with a rotor de-weight hole and an end plate guide hole; one part of the cooling liquid is thrown out from the end plate guide hole and is in contact with the inner end face of the winding for heat exchange, and winding cooling is completed; and the other part of the cooling liquid passes through the rotor de-weight hole communicated with the rotor core, so that the cross flow in the axial direction is completed, and the rotor iron core is cooled. According to the invention, the hollow shaft, the end plates, the rotor core, the permanent magnet magnetic isolation bridges and other structures are fully utilized to set the cooling flow channels, so that the influence of the cooling flow channels on electromagnetic performance is reduced; through a rotor encapsulation process, the change of a cooling flow channel structure is realized, and the flow demand and the temperature rise demand are balanced. and the rotation inertia is reduced, the oil stirring loss is reduced, and the motor performance output and the system efficiency are improved.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicle power assembly cooling, and relates to a direct cooling system applied to the rotor and winding of a high-speed permanent magnet motor. Background technique [0002] With the continuous increase in the speed demand of permanent magnet synchronous motors, the heat generated by the rotor and the magnetic steel at high speeds will increase, and the temperature will increase, which will cause the performance of the magnetic steel to decline, affect the performance output of the motor assembly, and even cause irreversible demagnetization; affect the power performance of pure electric vehicles, Reliability and even safety. The importance of rotor cooling is highlighted, and the design methods and cooling effects vary. [0003] At present, the oil-cooled shaft method is mostly used for rotor cooling, and the cooling oil is passed through the hollow shaft, and the cooling is completed through ...

AI Technical Summary

Problems solved by technology

[0007] The inlet and outlet of the rotor oil circuit involved in this patent are arranged in the hollow shaft, one end flows in - axial flow cooling - the other end flows out, this process is all completed in the rotor assembly, and does not involve cooling at the end of the winding; cooling in this patent Under the action of the centrifugal force of the rotor rotation, the pressure of the liquid to achieve axial flow is relatively high, and this fluid structure requires high pump capacity.

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