Motor fault detection system based on high-frequency signal coupling injection

Abstract

The invention discloses a motor fault detection system based on high-frequency signal coupling injection. The power input end of the motor is connected with a power supply through an inverter; the power input end of the motor is connected with a high-frequency detection signal source circuit for injecting a high-frequency detection signal into a motor winding through a coupling circuit; the inputend of the high-frequency detection signal source circuit is connected with the output end of the motor main controller; therefore, the output of a high-frequency detection signal is controlled; the output end of the response signal processing circuit is connected with the signal input end of the motor main controller, the response signal processing circuit is used for sending received motor winding voltage or current response signals to the main controller, and the motor main controller judges whether the motor breaks down or not and judges the fault degree by analyzing the received responsesignals after excitation is applied. The system is suitable for motors with different power levels and different rated parameters, realizes real-time detection of motor faults, and overcomes the defect of slow response of offline detection to faults. And meanwhile, the influence of the inverter on the high-frequency signal detection precision is avoided.

Description

technical field [0001] The invention relates to a motor fault detection. In particular, it relates to a motor fault detection system based on high-frequency signal coupling injection. Background technique [0002] As an important power equipment, motors are widely used in petroleum industry, aerospace, household appliances, rail transit and other fields. Once the motor fails, it will cause stoppage or outage, bring great economic losses, and even endanger production safety. [0003] In order to avoid motor failures, in practical applications, motors often require regular maintenance for offline fault detection. However, the offline fault detection method has a long detection cycle and poor real-time performance. With the urgent need for safe production and the development of science and technology, the technology that can detect motor faults online and even provide early warning of faults has attracted the attention of the industry. [0004] The common faults of motors i...

AI Technical Summary

Problems solved by technology

However, the high-frequency detection signal of the existing method is injected by the inverter, and the detection accuracy is limited by factors such as the switching frequency of the inverter and its nonlinear characteristics, which may cause misjudgment of motor faults

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