State estimation method and device of permanent magnet synchronous motor, computer device and storage medium

By generating a primary estimate using a sliding mode observer and combining it with an adaptive observer that incorporates model-driven and integral correction terms, the problem of harmonic components in the output of the sliding mode observer is solved, achieving smooth estimation of the back electromotive force and high-precision identification of the rotor position and velocity.

CN122247268APending Publication Date: 2026-06-19CHONGQING SOKON POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING SOKON POWER CO LTD
Filing Date
2026-02-28
Publication Date
2026-06-19

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Abstract

This application discloses a state estimation method, apparatus, computer device, and storage medium for a permanent magnet synchronous motor (PMSM), relating to the field of sensorless control technology for PMSMs. It addresses the problem in related technologies where the output of the sliding mode observer still contains significant harmonic components, leading to continuous fluctuations in the estimated back electromotive force (EMF). The method includes: generating a primary estimate of the back EMF based on the measured current value of the PMSM using a first observer; updating the internal estimate of the back EMF maintained by the second observer according to the primary estimate and a preset update law using a second observer, wherein the update law includes at least: a model driving term generated based on the state model of the back EMF, and an integral correction term generated by integrating the error between the primary estimate and the internal estimate; and using the updated internal estimate as the target estimate of the back EMF.
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