Online monitoring method and device for insulation of three-phase asynchronous alternating current motor stator

A technology for AC motor and stator insulation, which is used in measuring devices, motor generator testing, measuring electricity, etc., and can solve problems such as low reliability, high cost, and poor accuracy.

Active Publication Date: 2017-06-13
HANGZHOU ANMAISHENG INTELLIGENT TECH CO LTD
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Problems solved by technology

[0004] In order to overcome the problems in the prior art that multiple performances cannot be evaluated at the same time and the on-line monitoring technology has low reliab

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  • Online monitoring method and device for insulation of three-phase asynchronous alternating current motor stator
  • Online monitoring method and device for insulation of three-phase asynchronous alternating current motor stator
  • Online monitoring method and device for insulation of three-phase asynchronous alternating current motor stator

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Embodiment Construction

[0076] The above and other technical features and advantages of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them.

[0077] The invention provides a PHM-based method for on-line monitoring of the insulation system of a three-phase asynchronous AC motor, the flow chart of which is as follows figure 1 shown.

[0078] S1. Synchronously collect the voltage and current signals of the motor insulation system;

[0079] S2. Process the collected motor voltage and current signals using PWM demodulation technology;

[0080] S3. Extract the characteristic index of the processed signal, including current MCSA characteristic index, current signal statistical pattern recognition index, sequence voltage distribution statistical index, Park transformation characteristic index, three-phase AC voltage difference stati...

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Abstract

The invention discloses an online monitoring method for insulation of a three-phase asynchronous alternating current motor stator. The online monitoring method comprises the following steps of synchronously collecting voltage and current signals of a motor insulation system; using a PWM (pulse width modulation) demodulation technique to process the collected voltage and current signals of the motor; extracting feature indexes of the processed signals, such as a MCSA (motor current signature analysis) feature index, a current signal statistical mode identification index, a sequence voltage distribution statistical index, a Park conversion feature index, a three-phase alternating current voltage difference statistical index and a three-phase alternating current difference statistical index; using each extracted index as a training set of a support vector machine to pre-diagnose the state, outputting the comprehensive state pre-diagnosis result of the motor insulation system, and evaluating the running state of the motor insulation system on line. The online monitoring method for the motor insulation system has the advantages that the motor insulation state can be effectively monitored for a long time; by integrating multiple types of insulation feature indexes, the reliability and monitoring precision of the method are improved, and the data processing precision is high.

Description

technical field [0001] The invention relates to the technical field of electrical equipment monitoring, in particular to an on-line monitoring method and device for stator insulation of a three-phase asynchronous AC motor. Background technique [0002] In general, three-phase asynchronous AC motors are key devices in many engineering fields, and are widely used in high-speed trains, aerospace, electric vehicles and other fields. In recent years, safety accidents of three-phase asynchronous AC motors have occurred frequently. The turn-to-turn insulation fault of the system is one of the main factors causing motor accidents. Therefore, online monitoring and evaluation of the stator insulation of three-phase asynchronous AC motors is of great significance for improving the reliability of motor equipment. At present, there are a series of detection methods for motor insulation faults. There are offline detection methods such as AC impedance method, power loss method, differenti...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R31/34
CPCG01R31/1272G01R31/346
Inventor 李强易永余吴芳基李杰倪军
Owner HANGZHOU ANMAISHENG INTELLIGENT TECH CO LTD
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