Motor fault detection system and method based on total harmonic coefficient of current

Abstract

The invention discloses a motor fault detection system based on the total harmonic coefficient of current, and the system comprises a current collection module, a DSP processor, and a fault display and protection module. The current collection module transmits a collected current of a motor stator to the DSP processor, and the DSP processor is connected with a fault current harmonic comparison library and a fault display and protection module. The fault current harmonic comparison library carries out the pre-calibration of the corresponding relation between a fault state and the total harmoniccoefficient of current. The DSP processor calculates and obtains the total harmonic coefficient of current according to the collected current, and obtains the fault information through the fault current harmonic comparison library. The DSP processor transmits a control signal to the fault display and protection module, and the fault display and protection module is used for displaying fault information and transmitting a motor protection signal. The system is advantageous in that the system can quickly obtain the fault information and type through the pre-calibrated fault current harmonic comparison library, timely cuts off a drive circuit, and protects the safety operation of a motor.

Description

technical field [0001] The invention relates to the field of motor fault detection, in particular to a motor fault detection system and method based on current total harmonic coefficient. Background technique [0002] Motor is an indispensable transmission mechanism in industrial production and life. The performance of the motor determines the efficiency of the industrial production line and the degree of comfort in life. However, motor failure often affects the intelligence and automation of industrial production and life. Motor fault detection and protection to avoid secondary fault damage, motor fault detection and protection methods are very necessary. [0003] Motor faults mainly come from electrical faults and mechanical faults. Electrical faults mainly include undervoltage, overvoltage, overcurrent, high temperature, short circuit of the drive circuit, overvoltage, overcurrent, heat resistance of the drive power tube, and short circuit of the stator winding coil. , s...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of motor fault detection and protection, such as patent 201510275816X-motor fault detection method and device and motor fault protection system, according to the detected negative sequence current value and the set threshold value, the fault is judged and protected, but not The fault type of the motor cannot be accurately detected

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