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Device and method for detecting winding inter-turn short-circuit fault of fraction-slot concentrated winding permanent magnet motor

An inter-turn short-circuit fault, permanent magnet motor technology, which is applied to measurement devices, electromechanical devices, electrical winding testing, etc., can solve problems such as limited detection speed, occupation of computing resources, and occupation of computing resources or detection circuits for zero-crossing detection. Achieve the effect of fast detection and low cost

Active Publication Date: 2019-02-15
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method does not require FFT calculations, the zero-crossing detection requires additional computing resources or detection circuits
In addition, this method requires the detection signal to have at least one revolution of the motor, and the detection speed is limited
[0006] In short, the existing technologies all need to be calculated by FFT, the detection speed is limited, and additional computing resources are occupied

Method used

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  • Device and method for detecting winding inter-turn short-circuit fault of fraction-slot concentrated winding permanent magnet motor
  • Device and method for detecting winding inter-turn short-circuit fault of fraction-slot concentrated winding permanent magnet motor
  • Device and method for detecting winding inter-turn short-circuit fault of fraction-slot concentrated winding permanent magnet motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0040] In the implementation case 1, the four detection values ​​are compared with the threshold T in sequence c size, to detect whether there is a short-circuit fault between the turns of the winding. The sum of multiple detection signals may also be compared with the sum of corresponding thresholds. If the sum is greater than the threshold, the winding coil corresponding to the detection coil to which the group of detection signals belongs has a turn-to-turn short circuit fault.

Embodiment example 2

[0041] In the implementation case 2, the two detection values ​​are compared with the threshold T in sequence c size, to detect whether there is a short-circuit fault between the turns of the winding. The sum of the two detection signals can also be compared with the sum of the corresponding thresholds. If it is greater than the threshold, the winding coil corresponding to the detection coil to which the group of detection signals belongs has an inter-turn short circuit fault.

[0042] The measured value of the detection coil can be the voltage U of the detection coil or the flux linkage λ of the detection coil.

[0043] at rated speed n 0 , rated current I 0 Under the excitation, measure the voltage of the detection coil, and measure the amplitude of the sum of the voltages of n groups of m detection coils respectively Integrate the voltage of the detection coil to calculate the flux linkage λ of the detection coil n_h =∫U n_h dt, respectively measure the amplitude of t...

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Abstract

The invention provides a device and a method for detecting winding inter-turn short-circuit fault of a fraction-slot concentrated winding permanent magnet motor. The method comprises the following steps: placing search coils at winding ends of the fraction-slot concentrated winding permanent magnet motor; combining measurement values of search coils corresponding to different phase windings into aset of detection signals; and determining whether a motor has an inter-turn short-circuit fault by comparing a detection signal of a group of search coils with a threshold value. The method does notneed to perform Fourier transform on detected values, and does not need to add an additional data collection device, which is simple and convenient and has low-cost.

Description

technical field [0001] The invention relates to a winding inter-turn short-circuit fault detection device and method for a fractional slot concentrated winding permanent magnet motor. Background technique [0002] As the demand for energy saving and emission reduction becomes more and more urgent, permanent magnet motors are widely used in various industries in the field of industrial applications due to their remarkable advantages of high efficiency. With the wide application of permanent magnet motors, fault detection of permanent magnet motors has become a research hotspot in enterprises and research institutes. In permanent magnet motor faults, winding faults account for about 30%-40%, and inter-turn short circuit faults are the most serious among winding faults. Therefore, timely and convenient detection of winding turn-to-turn short circuit fault is an effective means to improve the safety and reliability of permanent magnet motors. [0003] Patent 201610491494.7 pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/06G01R31/02H02K11/20
CPCG01R31/50G01R31/72H02K11/20
Inventor 李琦范涛温旭辉李晔王佐梁
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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