In-slot self-cooling high-speed permanent magnetic motor system for compressor

Abstract

The invention relates to an in-slot self-cooling high-speed permanent magnetic motor system for a compressor and belongs to the technical field of motors. The megawatt high-speed variable-frequency motor comprises a cooling water jacket, a stator core, a stator winding, a stator radial air channel, an inner stator air channel, a permanent magnet rotor, two sliding bearings and two compressor impellers. The system has the advantages that the problems of severe heat and uneven temperatures of a high-speed motor rotor can be solved effectively; the problems of the over-temperature and overlarge axial temperature gradient of the stator core are solved; and not only the strength problem of a permanent magnet under a condition of high-speed rotation of the rotor can be solved mechanically, but also higher harmonics can be effectively prevented from entering the permanent magnet and generating added losses electromagnetically.

Description

technical field [0001] The invention belongs to the technical field of motors, and relates to a self-cooling high-speed permanent magnet motor system in a tank for compressors. The motor has the characteristics of simple structure, high efficiency, reliability, good heat dissipation, and high rotor strength, and realizes the motor and compressor. Integrated, especially suitable for compressors transported by natural gas pipelines. Background technique [0002] Due to high speed, high power density, and small size, high-speed motors can effectively save materials; high-speed motors have small moment of inertia and fast dynamic response; high-speed motors can be directly connected to working machines or loads, eliminating the need for traditional mechanical transmission devices , thus reducing noise and improving the efficiency of the transmission system. The research and application of high-speed motors meet the needs of economic development for energy conservation and emi...

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Problems solved by technology

[0004] Purpose of the invention: The present invention provides a self-cooling high-speed permanent magnet motor system in a slot for a compressor, and its purpose is to solve the problem of insufficient permanent magnet strength and easy damage of the conventional motor rotor when the rotor rotates at a high speed, as well as the high-power and high-density motor system. The problem of high loss density of the motor, difficulty in dissipating heat, and excessive temperature rise seriously affects the reliability and operating life of the motor. At the same time, it prevents high-order harmonics from entering the permanent magnet to cause additional loss, and avoids serious demagnetization of the permanent magnet under high temperature conditions. Even the phenomenon of irreversible demagnetization greatly improves the reliability of the motor

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