A method for determining harmonic voltage of a permanent magnet synchronous motor and related device

CN121333150BActive Publication Date: 2026-07-21WEICHAI POWER CO LTD

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: WEICHAI POWER CO LTD
Filing Date: 2025-11-14
Publication Date: 2026-07-21

AI Technical Summary

Technical Problem

How to determine the harmonic voltage of a permanent magnet synchronous motor in order to reduce torque ripple, improve the NVH performance of the permanent magnet synchronous motor, and enhance the control accuracy of the permanent magnet synchronous motor by suppressing the harmonic voltage.

Method used

By fixing the motor parameters and combining system disturbances, the differential equation of the stator fundamental current of the permanent magnet synchronous motor is simplified, and an augmented state variable method is constructed. Based on the Kalman optimal estimation principle, the errors of the state space equation and the fundamental current sensor measurement system are corrected to obtain the true harmonic current estimate, and the harmonic voltage is determined based on the estimate.

Benefits of technology

It effectively reduces the complexity of motor control, realizes decoupled control of dq axis current, accurately simulates the real behavior of permanent magnet synchronous motor, reduces torque pulsation through harmonic voltage suppression, improves NVH performance, and enhances control accuracy.

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Abstract

The application discloses a kind of harmonic voltage determination methods of permanent magnet synchronous motor and related devices, it is related to motor control field, including by fixing motor parameter, and combining system disturbance, permanent magnet synchronous motor stator fundamental wave current differential equation is simplified, obtain permanent magnet synchronous motor stator fundamental wave current simplified differential equation, and based on harmonic current and the method of constructing augmented state variable are handled, obtain the state space equation containing harmonic current, according to Kalman optimal estimation principle, the error existing in state space equation and fundamental wave current sensor measurement system is corrected simultaneously, obtain the real harmonic current estimation value in the operation process of permanent magnet synchronous motor, to determine the harmonic voltage of permanent magnet synchronous motor.The application obtains the harmonic voltage of permanent magnet synchronous motor by simplifying permanent magnet synchronous motor stator fundamental wave current differential equation, considers harmonic current and the method of constructing augmented state variable, and based on Kalman optimal estimation principle.

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