A permanent magnet synchronous motor speed filtering device and filtering method

Abstract

The invention relates to a rotating speed filtering device and filtering method of a PMSM. The rotating speed filtering device of the PMSM comprises a position sensor, the PMSM, a rotating speed calculating module, a Kalman filtering module, a speed ring PI adjuster, a current sensor, a summation module, a coordinate transformation module, a first current ring PI adjuster, an SVPWM module, a second current ring PI adjuster and an inverter. The position sensor, the rotating speed calculating module and the speed ring PI adjuster form a speed ring. The coordinate transformation module and the current ring PI adjuster form a q-axis current ring. The coordinate transformation module and the current ring PI adjuster form a d-axis current ring, and the q-axis current ring and the d-axis current ring form a current ring. The filtering method based on the rotating speed filtering device of the PMSM can effectively filter the detecting noise of the rotor rotating speed of the PMSM, calculated loads are reduced, and the parameter dependence degree on the PMSM is lowered.

Description

technical field [0001] The invention relates to a motor speed filter device and a filter method, in particular to a permanent magnet synchronous motor speed filter device and a filter method. Background technique [0002] Permanent magnet synchronous motors have the advantages of high efficiency, high power density, and no carbon brushes, and have been widely used in servo applications. In the field of servo application technology, mechanical sensors such as photoelectric encoders and resolvers are usually used to detect the rotor position of the motor, and the rotor speed is calculated by the difference of the rotor position. Affected by factors such as the limited resolution of the mechanical sensor and the quantization error of position detection, the velocity value obtained by direct difference often has large noise. This kind of noise is adjusted and amplified by the speed loop, which will cause larger glitches in the output of the speed loop, that is, the current comm...

AI Technical Summary

Problems solved by technology

In some permanent magnet synchronous motor servo applications with strict cost requirements, mechanical sensors such as photoelectric encoders with low resolution are generally used, and the detected rotor position has a large noise content

A low pass filter removes noise but introduces a phase delay

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