Rotor fault diagnosis method giving comprehensive consideration to current and voltage of motor

A technology of motor current and comprehensive consideration, which is applied in the direction of motor generator testing, measurement of electricity, and measurement of electrical variables. It can solve the problems of motor controller parameter influence and no quantitative index, and achieve online rotor fault diagnosis and large-scale practical meaning effect

Inactive Publication Date: 2015-07-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods often do not provide quantitative indicators, or can only be used in certain specific control situations, or will be affected by the parameters of the motor controller

Method used

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  • Rotor fault diagnosis method giving comprehensive consideration to current and voltage of motor
  • Rotor fault diagnosis method giving comprehensive consideration to current and voltage of motor
  • Rotor fault diagnosis method giving comprehensive consideration to current and voltage of motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: This embodiment deduces the amplitude I and the initial phase of the fault severity index k and the current fundamental wave component Amplitude U and initial phase of voltage fundamental component Current fundamental wave component initial phase The amplitude I of the left frequency current component l and initial phase The amplitude U of the left frequency voltage component l and, the initial phase of the left frequency voltage component The relationship between, specifically:

[0032] When the motor rotor is broken, the model on the motor rotor coordinate system is

[0033]

[0034] where u sd , u sq is the voltage of motor stator d-axis and q-axis, i sd i sq i rd i rq are the d-axis and q-axis currents of the stator and rotor, respectively, R s is the motor stator resistance, L s , L m , L r is the stator inductance, excitation inductance and rotor inductance of the motor, ω is the rotational angular velocity of the motor rotor, ...

Embodiment 2

[0063] Embodiment 2: In this embodiment, the relational formula derived in Embodiment 1 is used to diagnose the fault of the rotor, and the steps are as follows image 3 Shown:

[0064] (1) Collect the current and voltage signals of the motor. In this example, the sampling frequency of the voltage and current signals is the same as the time of the current loop, which is 8kHz (ie 125us). The current signal is collected by the current sensor. For Y-connected motors, the sum of the three-phase currents is always zero. Therefore, the third phase current of the motor can be obtained only by measuring the two phase currents. Note that the three-phase current signals are respectively i a , i b , i c ; In the present embodiment, the three-phase stator voltage can be approximately considered as the given voltage in the controller, therefore, it can be obtained by the voltage given signal of the DSP processor, and the three-phase voltage signals are respectively u a , u b , u c ...

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PUM

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Abstract

The invention relates to a rotor fault diagnosis method giving comprehensive consideration to current and voltage information of a motor and calculating a fault index for evaluating fault severity of a rotor according to the current and voltage information. The index can achieve diagnosis and quantification of a broken bar fault of the motor rotor. The method gives the comprehensive consideration to voltage and current signals, eliminates influence of a control strategy and a control parameter of the motor on a diagnostic result since the influence of the control strategy and the control parameter finally affects voltage of the motor, while the voltage is considered in the method; load and torque changes have smaller influence on the fault diagnosis index; at the same time, the method does not increase hardware expenditure of a system; a fault diagnosis program of the method can be embedded into a controller of an inverter; and the method can achieve on-line rotor fault diagnosis and has greater practical significance.

Description

technical field [0001] The invention relates to a method capable of realizing on-line fault diagnosis of broken bars of a squirrel-cage asynchronous motor rotor, belonging to the field of motor fault diagnosis. Background technique [0002] Induction motor has the advantages of simple structure and low price, so it has been widely used in industrial and agricultural production. However, rotor bar fractures can occur after a motor is repeatedly subjected to thermal, magnetic, environmental, and mechanical stress over long periods of time. The fracture of the guide bar will increase the current and stress of the adjacent guide bar, which will further expand the fault degree and reduce the output of the motor. In serious cases, the rotor will be swept and the stator will be damaged. Therefore, it is of great significance to detect and quantify the motor rotor fault in the early stage of the motor fault, and to repair it accordingly, so as to avoid unexpected shutdown and malig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/34
Inventor 黄进侯招文刘赫赵力航王彤陈嘉豪
Owner ZHEJIANG UNIV
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