Permanent magnet synchronous motor rotor correction method and system, storage medium and vehicle

By dividing the permanent magnet synchronous motor into sectors and performing timing, linear interpolation, and phase-locked loop smoothing, the problems of electrical angle discontinuity and angular velocity error caused by Hall sensors are solved, enabling continuous estimation of rotor angle and improving control accuracy, thus enhancing the user experience of automotive seat slide rails.

CN121055834BActive Publication Date: 2026-07-10SHANGHAI NAEN AUTOMOTIVE TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI NAEN AUTOMOTIVE TECH CO LTD
Filing Date
2025-08-21
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

The nonlinear error introduced by Hall sensors in permanent magnet synchronous motor control systems leads to inaccurate rotor electrical angle estimation, resulting in electrical angle discontinuity, angular velocity calculation error, torque pulsation, and noise and vibration problems. This is especially true in high-precision control scenarios, affecting control accuracy and user experience.

Method used

By dividing the electrical cycle into 6 sectors, independently timing the time interval of each sector, calculating the angular velocity and performing linear interpolation, combining it with a digital phase-locked loop for smoothing, dynamically adjusting the sector timing threshold and theoretical electrical angle, and employing an adaptive calibration algorithm to eliminate the nonlinear error of the Hall sensor.

Benefits of technology

It achieves continuous estimation of rotor electrical angle, reduces angular velocity calculation error and electrical angle jump, reduces torque pulsation and noise vibration, improves control accuracy and system stability, and meets the comfort and precision control requirements of high-end automotive seat slide rails.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to a permanent magnet synchronous motor rotor correction method and system, a storage medium and a vehicle. An angular velocity is calculated using a timing value corresponding to a previous period of a sector, and in one period, a certain 2pi electric angle is passed by a Hall, thereby avoiding the problem that one sector is not an ideal pi / 3 (60 DEG) caused by Hall nonlinear error. The angular velocity is calculated based on actual time, an initial angle is obtained through linear interpolation, and the smooth rotor angular velocity is obtained through digital phase-locked loop smoothing processing, the rotor angle jump and calculation error caused by the nonlinear error of the Hall sensor are solved, the continuous estimation of the rotor angle is realized, the angular velocity calculation error is reduced, the electric angle jump and burr are reduced, and the torque ripple and noise vibration problems are alleviated.
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