Linear Hall-based permanent magnet motor eccentricity diagnosis method and detection system thereof

Abstract

The invention discloses a linear Hall-based permanent magnet motor eccentricity diagnosis method and a detection system thereof, and belongs to the technical field of power generation, power transformation or power distribution. The method comprises the following steps: firstly, installing three linear Hall elements in a stator slot at the same space interval; secondly, converting analog signals outputted by the three-phase linear Hall element into digital signals through a digital signal processor, and converting the digital signals into orthogonal signals through linear combination; further, adopting a complex factor filter with harmonic selection capability to extract a negative sequence signal and a sideband signal from the orthogonal signal; then, adopting a synchronous reference system phase-locked loop to extract the amplitude of the negative sequence signal and the amplitude of the sideband signal as a static eccentricity indication quantity and a dynamic eccentricity indication quantity; and finally, calculating the indication quantity as a percentage representing the eccentricity degree in a digital signal processor. According to the invention, low-cost, high-compactness and high-precision rotor eccentricity detection is realized, the static eccentricity degree and the dynamic eccentricity degree are effectively distinguished, and the method can be applied to motors with various topological structures.

Description

technical field [0001] The invention relates to an eccentricity detection technology of a permanent magnet motor, specifically discloses a linear Hall-based permanent magnet motor eccentricity diagnosis method and a detection system thereof, and belongs to the technical field of power generation, transformation or distribution. Background technique [0002] Rotor eccentricity is one of the most common faults in motors, and rotor eccentricity in permanent magnet synchronous motors directly leads to asymmetrical air gap lengths, resulting in unbalanced magnetic pull between the stator and rotor. The unbalanced magnetic pull can further lead to other electrical and mechanical problems, such as unbalanced current loads in different phases, noise and vibration. The continuous operation of permanent magnet synchronous motors will cause bearing wear, increased eccentricity and even bearing fracture. Therefore, the monitoring and diagnosis of rotor eccentricity is essential in the ...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to address the deficiencies of the above-mentioned background technology, to provide a linear Hall-based permanent magnet motor eccentricity diagnosis method and its detection system, in the permanent magnet A linear Hall sensor for detecting radial flux density is installed in the stator slot of a synchronous motor, and the linear Hall output signal is processed to obtain real-time static eccentricity detection and real-time dynamic eccentricity detection of the rotor, realizing permanent magnet motors for various topologies The purpose of the invention is the low-cost non-invasive real-time eccentricity detection, which solves the technical problems of the existing permanent magnet motor eccentricity detection technology, such as the difficulty in data collection, high hardware costs, and the inability to simultaneously detect static eccentricity and dynamic eccentricity of motors with different topologies.

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