Permanent magnet temperature on-line detection method and device

Abstract

The invention provides a permanent magnet temperature on-line detection method and device which are applied to a permanent magnet motor. The permanent magnet temperature on-line detection method comprises the steps that the rotating speed and the counter electromotive force of the permanent magnet motor are acquired; the temperature value of a permanent magnet is obtained through calculation according to a preset temperature calculating rule, the rotating speed and the counter electromotive force, and the preset temperature calculating rule represents the corresponding relation of the rotating speed, the counter electromotive force and the temperature value of the permanent magnet. In the detection process, only the rotating speed and the counter electromotive force of the permanent magnet motor need to be acquired and calculated, the temperature of the permanent magnet can be directly obtained, the measuring method is simple, the testing amount is small, and the testing time is short. Moreover, due to the fact that high-cost devices such as a thermal infrared imager do not need to be used, and the testing cost is lowered. In the measuring process, constant temperature maintaining of cooling liquid of the motor is not involved, and operation is easy. In addition, the permanent magnet temperature on-line detection device is achieved in practical, and the measuring structure is simple.

Description

technical field [0001] The present application belongs to the field of permanent magnet motors, and in particular relates to a permanent magnet temperature online detection method and device. Background technique [0002] Permanent magnet motors have the advantages of light weight, simple structure, low loss, and high efficiency, and are widely used in various fields such as electric vehicles, rail transit, wind power generation, aerospace, and daily life. [0003] However, in actual operation, irreversible demagnetization of the permanent magnet may occur due to high temperature and other reasons, which leads to a decrease in the no-load back electromotive force, deterioration of the motor performance, and affects the normal operation of the motor. Therefore, real-time online detection of the permanent magnet motor and the temperature of the permanent magnet during operation are particularly important to improve the operating reliability of the permanent magnet motor. [0...

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Problems solved by technology

[0006] In view of this, the purpose of this application is to provide a permanent magnet temperature online detection method and device, the temperature of the permanent magnet is detected online, the temperature of the permanent magnet can be directly obtained, the measurement method is simple, and the test volume in the prior art is solved. Large, long test time disadvantages

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