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Digital detection system for detecting rotor broken bar failure of asynchronous motor and detection method of digital detection system

A technology for asynchronous motor and rotor broken bars, which is applied in the direction of motor generator testing, etc., can solve the problems of low side frequency measurement accuracy and high frequency misjudgment, etc.

Inactive Publication Date: 2013-04-10
NANJING INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the problems of low side frequency measurement accuracy and high frequency misjudgment caused by motor load changes in the prior art, the present invention provides a digital asynchronous motor rotor broken bar fault detection system and its detection method, which can improve The accuracy of side frequency measurement reduces the misjudgment caused by motor load changes, and a new criterion for broken rotor bars is proposed

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  • Digital detection system for detecting rotor broken bar failure of asynchronous motor and detection method of digital detection system
  • Digital detection system for detecting rotor broken bar failure of asynchronous motor and detection method of digital detection system
  • Digital detection system for detecting rotor broken bar failure of asynchronous motor and detection method of digital detection system

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Embodiment 1

[0058] Such as figure 1 , the digital asynchronous motor rotor broken bar fault detection system of the present embodiment, it comprises signal extraction equipment 6, communication interface 1, frequency spectrum analysis device 2, signal output equipment 3, discriminator module I5, filter 4 and discriminator module II7 , the communication interface 1 is connected with the spectrum analysis device 2 and the signal extraction device 6 respectively, the output end of the spectrum analysis device 2 is respectively connected with the signal output device 3 and the filter 4, and the The filter 4 receives the signal from the spectrum analysis device 2, and the output terminal is connected with the discriminator module 15 and the signal extraction device 6 respectively, and the output terminal of the signal extraction device 6 is connected with the discriminator module II7, the outputs of the discriminator module I5 and the discriminator module II7 are both connected to the signal o...

Embodiment 2

[0075] The stator current waveform measured by the experimental motor Y100L-2 is as follows: Figure 7 (Partial data 200 points, sampling frequency 400Hz). The spectrum classification of the current signal is as follows: Figure 8 to Figure 17 . Obtain i by the method of embodiment 1 Q = 3.7899. Find the side frequency at 49.4Hz to 49.6Hz (equivalent to f in Example 1 2 signal) amplitude, phase and frequency: 0.6767, -0.1317 and 49.5002Hz. Find the side frequency at 50.2Hz to 50.8Hz (equivalent to f in Example 1 3 Signal) amplitude, phase and frequency: 1.0820, -3.0088 and 50.5006Hz (frequency step: 0.001Hz, N sampling points take 80000). According to the classification dynamic observation of the current signal spectrum, and the K 1 、K 2 Carry out the following calculations (only one calculated value in a certain period of time is shown here, it should be a continuous dynamic calculation), and the calculations of multiple time periods are greater than the given thr...

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Abstract

The invention discloses a digital detection system for detecting the rotor broken bar failure of an asynchronous motor and a detection method of the digital detection system, and belongs to the technical field of motor detection. The system comprises signal extraction equipment and further comprises a communication interface, a spectral analysis device, signal output equipment, an identifier module I, a wave filter and an identifier module II. The communication interface is connected with the spectral analysis device and the signal output equipment respectively, the output end of the spectral analysis device is connected with the signal output equipment and the wave filter respectively, the wave filter receives a signal from the spectral analysis device, the output end of the wave filter is connected with the identifier module I and the signal extraction equipment respectively, the output end of the signal extraction equipment is connected with the identifier module II, the output ends of the two identifier modules I and II both access to the signal output equipment. The digital detection system can improve the precision of side frequency measurement, reduce the error judgment caused by the load change of the motor and provide a new criterion of the rotor broken bar failure.

Description

technical field [0001] The invention belongs to the technical field of motor detection, and more specifically relates to a digital detection system capable of online detection of a high-voltage asynchronous motor rotor broken bar fault and a detection method thereof. Background technique [0002] Squirrel-cage asynchronous motor rotor broken bar is a common fault of the motor. If it is not detected in time and treated in time, it will affect its safe and stable operation. It has important practical significance for how to monitor the operation status of high-voltage motors on-line in power plants and large petrochemical enterprises. Judging from the existing invention patents and published articles, the main problems in the detection of broken bars of the squirrel-cage asynchronous motor rotor are concentrated in two aspects: (1) Finding the fundamental wave and (1±2s)f 1 The side frequency component value, especially in the presence of a large number of disturbances and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
Inventor 王玉忠蒋志平顾艳
Owner NANJING INST OF TECH