Fault diagnosis system and method for high-power permanent magnet motor

Abstract

The present invention provides a large-power permanent magnet motor fault diagnosis system and method. The system comprises a permanent magnet motor, a servo controller and an industrial control computer. The permanent magnet motor is connected with the servo controller, the servo controller is electrically connected with the industrial control computer, the permanent magnet motor is provided witha vibration sensor and a temperature sensor, the vibration sensor and the temperature sensor are connected with the industrial control computer, and the permanent magnet motor is connected with the industrial control computer through a temperature measurement optical fiber. The present invention creatively provides a mixed intelligent fault diagnosis method with a three-in-one mode of all-opticalwinding temperature detection, motor bearing vibration detection and permanent magnet motor current analysis. The large-power permanent magnet motor fault diagnosis system and method can discover thefaults of the large-scale permanent magnet motor easier, can reduce the maintenance, can improve the system reliability, can achieve foreseeability maintenance and can solve the problem that a large-scale permanent magnet motor cannot perform advance, comprehensive and effective fault diagnosis.

Description

technical field [0001] The invention relates to the field of fault diagnosis of high-power permanent magnet motors, in particular to a fault diagnosis system and method for high-power permanent magnet motors. Background technique [0002] With the improvement of the performance of rare earth permanent magnet materials in recent years, the design of large permanent magnet motors and the continuous development of drive control technology, high-power variable frequency speed regulation low-speed permanent magnet motors are characterized by high efficiency and energy saving, large starting torque, and stepless speed regulation. Advantages, it is more and more widely used in industrial occasions, and is gradually replacing the original traditional drive method of asynchronous motor + reducer. Because the high-power permanent magnet motor (3000KW, 90r / min) is large in size (2m in diameter), heavy in weight (20t), and high in cost, it is mainly used to drive key equipment. Once it ...

AI Technical Summary

Problems solved by technology

Because the high-power permanent magnet motor (3000KW, 90r / min) is large in size (2m in diameter), heavy in weight (20t), and high in cost, it is mainly used to drive key equipment. Once it fails and stops unexpectedly, it will have a great impact on production, etc.

[0003] However, the traditional motor fault diagnosis methods mainly use the multi-point embedded thermal resistance temperature measurement method to detect the motor over-temperature fault, which cannot realize the full-coverage detection of the motor winding temperature; use the current amplitude comparison to judge the over-current and short-circuit faults, and cannot detect the motor. Demagnetization faults are detected, and a single detection method cannot achieve effective fusion of information, resulting in inability to diagnose faults or inaccurate diagnosis

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