Permanent magnet synchronous motor control method and system based on position correction and storage medium

CN115065293BActive Publication Date: 2026-06-30XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XI AN JIAOTONG UNIV
Filing Date
2022-07-11
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In existing permanent magnet synchronous motor control methods, the error analysis and correction of position information are insufficient, resulting in insufficient control accuracy and reliability. In particular, when switching between sensored and sensorless control modes, the position information cannot be accurately determined, affecting the stability of motor operation and the accuracy of speed control.

Method used

By acquiring accurate position information under sensor control, calculating the relative error and setting a threshold, position compensation and correction are performed. Combined with error analysis of sensor and non-sensor control modes, multiple real-time detections and corrections are achieved to ensure the accuracy and reliability of position information.

Benefits of technology

It improves the accuracy of motor position information and the reliability of operation, avoids the impact of single control mode failure on motor operation, and ensures high-precision and high-reliability motor control.

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Abstract

This invention discloses a control method, system, and storage medium for a permanent magnet synchronous motor based on position correction, relating to the field of motor control. The steps are as follows: During motor operation, both sensored and sensorless position calculations are performed simultaneously. When the position increment is 0 under sensored control for the first time, the position under sensored control is obtained and designated as the first position, and the position under sensorless control at this time is designated as the second position. The relative error between the first and second positions is calculated. It is determined whether the relative error exceeds a preset threshold. If the relative error exceeds the preset threshold, position compensation is performed on the second position; if it does not exceed the preset threshold, no compensation is required. This invention continuously performs the above-mentioned position compensation process during motor operation and judges the compensation effect based on the trend of relative error changes, adjusting the compensation algorithm in a timely manner. It performs timely position correction for both sensorless and sensored control, achieving continuous correction of motor speed and improving the accuracy of motor position information.
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