Permanent-magnet synchronous motor cooling structure

Abstract

The invention discloses a permanent-magnet synchronous motor cooling structure. The front end of the cavity of a motor is provided with a cooling medium inlet at the joint of a cylinder and a stator. A spiral flow channel is designed between the motor cylinder and the motor stator to cool the outer surface of the motor stator. When cooling medium arrives at the tail end of the motor, as all other parts of the tail end of the motor are sealed, the cooling medium can only pass through an air gap between the stator and a rotor so the cooling medium is forced to cool the outer surface of the motor rotor and the inner surface of the motor stator. Then, the cooling medium enters next container via an air return port at the front end of the motor. As the cooling medium entering the air gap between the motor stator and the rotor has been cooled once, in order to avoid insufficient cooling, a channel of cooling medium is added on the end face of the rear end cover of the motor to enhance the cooling effect. The structure of the scheme is particularly applicable to 500-1500KW high-power permanent-magnet synchronous motors, and can be used in centrifugal compressors, screw compressors, blowers and other similar models.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a cooling structure of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors have the characteristics of small size, high overall operating efficiency, and high power factor. In recent years, they are often used to drive compressors. Compared with the transmission asynchronous starter motor, the permanent magnet synchronous motor is excited by the permanent magnet in the motor rotor, which can avoid the excitation loss caused by the magnetic field generated by the excitation current, but it also needs to adopt forced heat dissipation measures to take away the heat inside the permanent magnet synchronous motor. Avoid the demagnetization phenomenon caused by the permanent magnet inside the rotor due to long-term high temperature working environment. Especially for high-power motors, the winding current is large, and the heat generat...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a permanent magnet synchronous motor cooling structure to solve the cooling problem of motors, especially high-power motors, and avoid serious losses caused by demagnetization of permanent magnets caused by long-term operation of motor rotors in high-temperature environments

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