Motor closed-loop switching method and device, electronic equipment and storage medium

By detecting and judging the zero-crossing signal of the motor's back EMF signal, and identifying and processing interference signals, the accurate switching of the motor in a strong magnetic field environment is ensured. This solves the problem of interference signals affecting the detection of the zero-crossing signal and improves the reliability of motor starting and switching.

CN115706545BActive Publication Date: 2026-06-30GUANGDONG WELLING ELECTRIC MACHINE MFG +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGDONG WELLING ELECTRIC MACHINE MFG
Filing Date
2021-08-03
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In strong magnetic field environments, interference signals severely affect the accuracy of zero-crossing signal detection in permanent magnet synchronous motors, leading to closed-loop switching failures or even motor burnout. Existing technologies struggle to eliminate the impact of interference signals without affecting the start-up success rate and smoothness, thus ensuring the accuracy of zero-crossing signal detection and the reliability of motor closed-loop switching.

Method used

By detecting the zero-crossing signal of the motor's back EMF signal, it is determined whether there is an interference signal. If there is, closed-loop switching is performed according to the target switching strategy. If there is no interference, the preset speed is directly used as the initial speed. The motor closed-loop switching method and device, including a detection module, a judgment module and a switching module, are used to achieve anti-interference processing.

Benefits of technology

It improves the starting reliability and closed-loop switching accuracy of the motor in a strong magnetic field environment, avoids the influence of interference signals on the zero-crossing signal detection results, and enhances the reliability of the motor in a strong magnetic field.

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    Figure CN115706545B_ABST
Patent Text Reader

Abstract

The application provides a motor closed-loop switching method and device, electronic equipment and a storage medium. The method comprises the following steps: detecting a zero-crossing point signal of a motor back electromotive force signal; judging whether an interference signal exists in the zero-crossing point signal; if it is identified that the interference signal exists, performing closed-loop switching according to a target switching strategy; and if it is identified that the interference signal does not exist, directly taking a first preset rotating speed as an initial speed after the motor is switched to a closed-loop running stage. The application can perform anti-interference processing after detecting the interference signal, avoid the influence of the interference signal on the detection result of the zero-crossing point signal, and further weaken the influence of the interference signal on the closed-loop switching operation, so that the switching in the closed-loop stage of the motor is more reliable, and in particular, the reliability of the motor starting in a strong magnetic field environment is enhanced.
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