Asynchronous motor rotor broken bar fault determination method

Abstract

The invention discloses an asynchronous motor rotor broken bar fault determination method, and belongs to the motor fault determination field. The asynchronous motor rotor broken bar fault determination method includes the steps: an acquisition instrument acquires the voltage and current data through a current clamp and a voltage clamp, and performs spectrum analysis on current; if the current signal is normal, a motor rotor has no broken bar faults, and if the current signal is abnormal, one sideband appears at each of the positions that the power frequency differs from the slip frequency bytwo times, and then the text step is performed; and spectrum analysis is performed on voltage, and if the voltage signal is normal, the motor rotor has no broken bar faults, and if the voltage signalis abnormal and when one sideband appears at each of the positions that the power frequency differs from the slip frequency by two times, a broken bar fault exists in the motor rotor. For solving theproblem that the motor current signal analysis method in the rotor broken bar fault of an asynchronous motor in the prior art may encounter error determination, the asynchronous motor rotor broken barfault determination method uses the mode of using the stator current and the stator voltage to determine successively to detect the rotor broken bar fault, thus reducing the error determination rate.

Description

technical field [0001] The invention relates to the field of motor fault judgment, in particular to a method for judging a broken bar fault of an asynchronous motor rotor. Background technique [0002] With the advancement of modern science and technology and the increasing scale of power systems, motors play an increasingly important role in modern industrial production. Motor failure will not only damage the motor itself, but also affect the normal operation of the entire system, and even endanger personal safety in serious cases, causing huge economic losses and significant social impacts. Therefore, the diagnosis of motor faults has important significance and engineering practical value. Studying the monitoring and fault diagnosis technology of high-voltage asynchronous motors is of great significance to prevent the occurrence of high-voltage asynchronous motor faults, find and eliminate faults in time, ensure the reliable operation of induction motors, and improve produ...

AI Technical Summary

Problems solved by technology

[0003] At present, the method for judging the broken rotor bar of an asynchronous motor is mainly based on detecting the current of the motor, and the analysis method of the motor current signal has its own defects: this method is affected by the load level and operating frequency

Its shortcomings are: the current detection method is easily affected by the load, the accuracy is low, and there are misjudgments and missed judgments

Its shortcoming is that the invention still relies on the stator current signal to judge the fault of the broken rotor bar. Once the stator current is affected by the load fluctuation, there is still the possibility of misjudgment through the control strategy of the stator voltage and current coupling.

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