Discrete speed control method for permanent magnet synchronous motor

CN122371787APending Publication Date: 2026-07-10CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Filing Date
2026-06-09
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Traditional extended state observers cannot effectively suppress high-frequency periodic harmonic disturbances when implemented digitally, resulting in severe speed pulsation of the permanent magnet synchronous motor and a decline in system performance.

Method used

By employing a discrete-time multi-frequency extended state observer (MFESO), and constructing a mechanical dynamics model and a lumped disturbance model for a permanent magnet synchronous motor, an error feedback control law is designed to achieve synchronous high-precision estimation of non-periodic slowly varying disturbances and multi-frequency periodic harmonics, and to provide feedback compensation for the observed disturbances.

Benefits of technology

It significantly suppresses motor speed pulsation, achieves high-precision and smooth speed control, and improves the dynamic response quality and steady-state control accuracy of permanent magnet synchronous motors under complex loads and harmonic interference.

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Abstract

This invention belongs to the field of motor control technology, and particularly relates to a discrete speed control method for a permanent magnet synchronous motor. It includes: S1: Constructing a mechanical dynamics model of the permanent magnet synchronous motor, and based on the mechanical dynamics model, constructing a lumped disturbance model; S2: Constructing an augmented state-space model based on the mechanical dynamics model and the lumped disturbance model, and based on the augmented state-space model, constructing a discrete-time multi-frequency extended state observer; S3: Designing an error feedback control law, and using the error feedback control law to compensate for the lumped disturbance observed by the discrete-time multi-frequency extended state observer, thereby achieving discrete speed control of the permanent magnet synchronous motor. This invention can synchronously and accurately observe and effectively suppress non-periodic slowly varying disturbances and multi-frequency periodic harmonics in the discrete-time domain, avoiding the increased system complexity and decreased overall performance caused by discretization of continuous-time design.
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