Locked-rotor anti-interference method and device for Hall sensor signal acquisition of permanent magnet synchronous motor

Abstract

The invention discloses a locked-rotor anti-interference method and device for Hall sensor signal acquisition of a permanent magnet synchronous motor. The method comprises the following steps: filtering Hall signals; comparing the Hall state before filtering with the Hall state after filtering; if the Hall state before filtering is the same as the Hall state after filtering, obtaining a locked-rotor count; and when the locked-rotor count is greater than a preset value, executing forced commutation; filtering signals collected by the Hall sensor, screening out the required bandwidth frequency,separating useful signals from noise, and improving the anti-interference performance and the signal-to-noise ratio of the signals; if the Hall signal is not changed after being filtered, judging thatstalling occurs. And when the locked-rotor count exceeds a preset value, forced commutation is executed, so that the permanent magnet synchronous motor can recover rotation, and more effective locked-rotor judgment and processing are realized.

Description

Technical field [0001] The invention relates to the technical field of permanent magnet synchronous motor control, in particular to a locked-rotor anti-interference method and device for collecting hall sensor signals of permanent magnet synchronous motors. Background technique [0002] Permanent magnet synchronous motors have many advantages such as simple structure, high power density, and simple control. In recent years, permanent magnet synchronous motors have been increasingly widely used in industrial fields such as high-performance speed regulation systems and servo control systems. [0003] At present, most permanent magnet synchronous motors rely on the Hall sensor to obtain the rotor position, but the accuracy of the Hall sensor is low, and the existing technologies rely on extracting the edge information of the Hall sensor to realize the commutation of the permanent magnet synchronous motor, so it runs at low speed or is blocked. The effective Hall state cannot be obtai...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a stall anti-disturbance method and device for hall sensor signal acquisition of permanent magnet synchronous motors, to solve the problem that in the prior art it is impossible to obtain an effective Hall state, causing the permanent magnet synchronous motor to vibrate back and forth or stall

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