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Cage type asynchronous motor rotor strip-broken failure detecting method

A technology for asynchronous motors and rotor broken bars, which is applied in the direction of motor generator testing, measuring electricity, measuring devices, etc., can solve problems such as motor asymmetry, air gap eccentric rotor misalignment, reliability to be improved, etc., to achieve Prevent misjudgment, improve sensitivity, and the effect of simple and convenient operation

Inactive Publication Date: 2007-08-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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AI Technical Summary

Problems solved by technology

[0011] The disadvantage of the time-varying spectrum analysis method of starting current is that it can only be applied after waiting for the motor to start
Similar to the adaptive filtering method, this method cannot take into account the inherent asymmetry of the motor itself, air gap eccentricity, rotor misalignment and other factors, and the reliability still needs to be improved

Method used

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  • Cage type asynchronous motor rotor strip-broken failure detecting method
  • Cage type asynchronous motor rotor strip-broken failure detecting method
  • Cage type asynchronous motor rotor strip-broken failure detecting method

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Embodiment Construction

[0049] The present invention adopts the circuit shown in Fig. 1 to detect, and this circuit is made up of current transformer CT, signal acquisition card and computer, and described current transformer is connected to a phase line of asynchronous motor stator winding, and its signal output terminal is connected to signal acquisition The analog signal input channel 5 of the card (input terminals 5 and 17), the output port of the signal acquisition card is connected to the USB port of the computer. The signal acquisition card adopts Ruibohua RBH8321 signal acquisition card, and the computer model is DELL M1210. The signal acquisition card integrates low-pass filter, signal acquisition and hold, analog / digital conversion and other circuits. The instantaneous stator current signal is sent to the signal acquisition card, and the signal acquisition card is connected to the portable computer through the USB interface. The portable computer controls the signal acquisition card to samp...

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Abstract

This invention is a methods and devices for detecting the fault of a cage rotor, which belongs to testing technology and for the settlement of broken rotor on the early detection of fault issue. Its technical program: through the acquisition of the stator transient current (is) continuously to do Fourier transform, receiving fundamental wave namely reference signal uS. Do adaptive filtering based the reference signal uS and the frequency f1 for the stator current transient signal. And then filter the output signal eT to do continuous the Fourier transform, identified (1 +- 2s) f1-frequency component and the amplitude of the fundamental components ratio as a failure features, the final determining fault index depending on fault detection threshold index and judge of Broken Bars, This invention can high sensitivity, high reliability and on-line detect the early induction motor of Broken Bars.

Description

technical field [0001] The invention relates to a method and a device capable of on-line detection of broken bars of a cage-type asynchronous motor rotor, belonging to the detection technical field. Background technique [0002] During the operation of the cage-type asynchronous motor, the rotor guide bars are subjected to alternating stresses such as radial electromagnetic force, rotating electromagnetic force, centrifugal force, thermal bending deflection force, etc., and rotor manufacturing defects may lead to broken bars. Such failures The probability of occurrence is about 15%. [0003] Broken rotor bars are a typical progressive fault. Usually one or two guide bars break at the initial stage, and then gradually develop until the output of the motor decreases or even shuts down. Therefore, on-line detection of rotor broken bars must be implemented, especially the on-line detection of initial rotor broken bars. [0004] After the broken rotor bar of the cage-type async...

Claims

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Application Information

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IPC IPC(8): G01R31/06G01R31/34
Inventor 许伯强孙丽玲
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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