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Detection method for rotor broken bars of induction motor based on absolute phase of stator current

A technology of absolute phase and broken rotor bars, applied in the field of fault diagnosis, can solve problems such as poor effect, and achieve the effect of simple principle, strong anti-noise interference ability, and low requirements for data storage and computing power

Active Publication Date: 2022-06-03
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of eliminating the power frequency through the filter is less effective, and it is necessary to explore a new method of eliminating the power frequency

Method used

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  • Detection method for rotor broken bars of induction motor based on absolute phase of stator current
  • Detection method for rotor broken bars of induction motor based on absolute phase of stator current
  • Detection method for rotor broken bars of induction motor based on absolute phase of stator current

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Experimental program
Comparison scheme
Effect test

Embodiment

[0139] 1.1) Connect the fault diagnosis system, the three current sensors, and the data acquisition system.

[0140] 1.2) The sampling frequency is set, and data acquisition is performed on the three-way current signals simultaneously.

[0142] 2.1) De-averaging: remove the DC component contained in the collected current signal.

[0144] Wherein mean(I) is the mean value of the calculated current sequence I, and m is a, b, c respectively.

[0146]

[0147] Wherein max(I) is to take the maximum value in the current sequence I, and m are respectively a, b, and c.

[0150]

[0151] f

[0154] a=[1 1 1],

[0157] Wherein i=1,2,3,...,N, N is the number of sampling points.

[0159] Take the square:

[0162] Where i=1, 2, 3,..., N, where N is the number of sampling points.

[0165]

[0169] p

[0171]

[0172] 7.3) Integral: for p

[0173]

[0177] The present invention will be further described below in conjunction with specific test effects.

[0178] FIG. 4 is a schematic diagram of a t...

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Abstract

The invention belongs to the technical field of fault diagnosis, and discloses a method for detecting a broken bar fault of an induction motor rotor based on the absolute phase of stator current, which collects three-phase current signals of a three-phase asynchronous motor; and preprocesses the collected data to remove the current The DC component of the signal sequence, and the amplitude of each current signal is normalized to obtain three discrete time series; the obtained discrete time series are derived, vectors are constructed, squared, triple products are calculated, absolute phases are calculated, Carry out frequency domain analysis; obtain the fault characteristic frequency of the broken bar of the rotor of the three-phase asynchronous motor. The invention has simple principle, small amount of calculation, low requirement on data storage and calculation ability of equipment, less influence by signal noise, can realize online detection of motor rotor broken bars, and diagnose early faults of motor.

Description

Detection method for broken bar fault of induction motor rotor based on absolute phase of stator current technical field The invention belongs to the technical field of fault diagnosis, relate in particular to a kind of induction motor based on the absolute phase of stator current Rotor broken bar fault detection method. Background technique [0002] At present, induction motors are widely used in industrial equipment as a driving component. In those more dependent on induction In critical motor applications, failure of the motor can result in very expensive downtime. In response to this problem, in the past ten years, In order to prevent expensive economic losses caused by motor failure, people have studied the technology of condition monitoring and fault diagnosis. motor rotor Broken bar is a common fault, which often causes unexpected failure of the motor, resulting in the loss of production efficiency. In recent years, such Faults are increasingly researched,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
CPCG01R31/346G01R31/343
Inventor 胡茑庆陈家庚张伦陈凌周洋罗鹏胡蛟王博政
Owner NAT UNIV OF DEFENSE TECH
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