Interturn short circuit fault detection method used for five-phase OWFTFSCW-IPM motor

Abstract

The invention discloses an interturn short circuit fault detection method used for a five-phase OWFTFSCW-IPM motor. The interturn short circuit fault detection method comprises steps that step1: actual current of a five-phase winding detected by a current sensor is adopted; step2: the estimated torque value of the motor is acquired by using a torque calculation formula; step3: the actual torque output value of the motor is measured by a torque sensor; step 4: the actual output torque of the motor is subtracted by the estimated torque to acquire torque deviation; step 5: the alternating current component of the torque deviation is filtered by a filter to acquire the direct current component of the torque deviation, and when the direct current component exists, the interturn short circuit fault occurs. The interturn short circuit fault detection method has advantages of simple realization, low requirements on controller, small calculated amount, simple operation, low misjudgement rate, and abilities of facilitating engineering realization, and detecting occurrence of interturn short circuit faults effectively in motor dynamic process.

Description

technical field [0001] The invention belongs to the field of motor fault detection, in particular to an inter-turn short-circuit fault detection method for a five-phase OW FTFSCW-IPM motor. Background technique [0002] In order to effectively alleviate the adverse effects of energy crisis and environmental pollution, it is an effective solution to vigorously develop all-electric vehicles on a global scale. The performance of electric vehicle motors is related to the operation performance and reliability of the entire drive system. The development of rare earth materials makes permanent magnet synchronous motors very competitive in terms of power density and efficiency compared with other motors, so it has become the first choice for electric vehicles. Prioritize options. Failure of the motor drive system will affect the normal operation of the entire system, and even cause safety accidents. Therefore, it is of practical significance to carry out fault diagnosis research o...

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Problems solved by technology

[0003] Existing literature has used Fast Fourier Transformation (Fast Fourier Transformation, FFT) to detect the occurrence of inter-turn short-circuit faults by detecting the amplitude of the 9th harmonic in the case of high-speed motors. However, in the case of dynamic motor operation, FFT analysis It will be difficult to troubleshoot

For this reason, there are literatures that introduce discrete wavelet transform (DWT), which can realize the analysis of inter-turn short-circuit fault current under dynamic working conditions of low-speed, medium-speed and high-speed motors, and determine the occurrence of faults. However, this method is too complicated and not Conducive to project realization

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