A stator-rotor integrated circulating cooling high-speed permanent magnet motor and a cooling method thereof

Abstract

The invention discloses a stator-rotor integrated circulating cooling high-speed permanent magnet motor and a cooling method thereof, the technical scheme adopted by the invention is that a stator anda rotor share an integrated cooling channel, the motor has its own cooling tank at the rear, A liquid flow guiding device is arranged on a hollow shaft section of a rotor shaft of the electric machine, the rotor shaft is a hollow shaft, A motor housing and a stator assembly housing enclose a cooling channel, A liquid flow guide device draw coolant placed in a cooling oil tank at that rear of themotor into a central passage of the rotor shaft during operation of the motor, the coolant enters the cooling oil passage formed by the motor housing and the stator assembly housing from the liquid flow guiding device, Finally, it returns to the cooling oil tank at the end of the motor to form a self-circulating system, which takes away the heat generated by the eddy current loss of the rotor andeffectively reduces the temperature of the rotor, thereby avoiding the problem of thermal demagnetization of the permanent magnet in the rotor of the high-speed motor under the high-temperature environment, and ensuring the safe and reliable operation of the high-speed permanent magnet motor.

Description

technical field [0001] The invention belongs to the field of permanent magnet motors, in particular to a high-speed permanent magnet motor with integrated circulation cooling of a stator and rotor and a cooling method thereof. Background technique [0002] Because high-speed permanent magnet motors do not require excitation windings, they have the advantages of high power density, high efficiency, and large speed range. There are many applications such as machining centers. [0003] The current high-speed permanent magnet motor not only increases the power density of the motor, but also makes the loss per unit volume of the motor and the operating temperature rise significantly higher than that of ordinary motors, and its cooling and heat dissipation problems are more prominent. High-speed permanent magnet motors generally adopt the cooling method of air cooling on the surface of the casing or oil through the casing, but the heat generated by the rotor of the high-speed per...

AI Technical Summary

Problems solved by technology

High-speed permanent magnet motors generally adopt the cooling method of air cooling on the surface of the casing or oil through the casing, but the heat generated by the rotor of the high-speed permanent magnet motor cannot be taken away by the above cooling method, and the cooling effect is poor, which may easily cause the rotor of the high-speed permanent magnet motor to overheat

The permanent magnets placed in the rotor of high-speed motors are prone to thermal demagnetization in high-temperature environments, which directly threatens the safe and reliable operation of high-speed permanent magnet motors

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