Method for diagnosing turn-to-turn short circuit of permanent magnet fault-tolerant motor

Abstract

The invention discloses a diagnosis method for inter-turn short trouble of a permanent magnetic motor with fault tolerance, which is characterized in that the method comprises the following steps: (a) the method implements the transient power analysis of motor windings, and if the number of the windings that have short trouble is no less than 10, the method decides whether a trouble happens by computing the mean value change of the transient power before and after the trouble happens, if the number of the windings that have short troubles is less than 10, the method turns to next step; (b) the method takes the derivation of the first-order complex Gaussian wavelet function as the wavelet function, analyzes and locates the unsteady signal of the inter-turn short trouble; (c) the method compares the transformation situations of the wavelet modulus maximum value of the transient power signal in a trouble phase and in a normal phase, and if the situations are the same, the method decides that no trouble exists; if the situation are different, the method decides that the inter-turn short trouble exists. By adopting the modulus maximum value of the complex Gaussian wavelet, the invention can markedly observe a distortion point of the transient power before and after an inter-turn short trouble happens, accurately capture trouble characteristics when the inter-turn short trouble happens in the motor, and solve the difficult problems of the online trouble diagnosis of the inter-turn short trouble of small turns of a stator winding in a permanent magnetic motor.

Description

technical field [0001] The invention relates to a method for diagnosing inter-turn short-circuit faults of permanent magnet fault-tolerant motors. Background technique [0002] Permanent magnet fault-tolerant motors are mainly used in systems with high reliability requirements in aviation, aerospace, weaponry, industrial control and other fields. Motors with this structure can avoid phase-to-phase short circuits of windings, but inter-turn short circuits of motors are difficult to avoid. A short circuit will cause serious damage to the system. The open-circuit fault and terminal short-circuit fault of the permanent magnet fault-tolerant motor stator winding are relatively easy to realize online fault diagnosis because of the obvious fault characteristics. The probability of inter-turn short circuit of permanent magnet fault-tolerant motor is relatively high, and the fault signal is weak when the number of turns is small, and its fault detection and diagnosis, especially the...

AI Technical Summary

Problems solved by technology

[0003] At present, there are relatively few research literatures on the fault diagnosis of inter-turn short circuit. For three-phase asynchronous motors, the method of detecting the negative sequence impedance and negative sequence current of the motor is used to diagnose the inter-turn short circuit. However, for permanent magnet fault-tolerant motors, there is still no effective method

In addition, the method of detecting negative sequence impedance and negative sequen

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