A method and system for smooth transition in the field-weakening transition region of a permanent magnet synchronous motor based on adaptive reduction of reference voltage

By adaptively adjusting the reference voltage of the permanent magnet synchronous motor, the problems of voltage overshoot and torque fluctuation in the voltage closed-loop field weakening control are solved, and the smooth transition of the motor in the field weakening region is realized, thereby improving the dynamic response and stability of the motor.

CN120546513BActive Publication Date: 2026-07-07HARBIN INST OF TECH
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Patent Information

Application Number
CN202510657224.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-05-21
Publication Date
2026-07-07
Estimated Expiration
2045-05-21

AI Technical Summary

Technical Problem

Traditional voltage-closed-loop field weakening control methods with fixed reference voltage suffer from voltage overshoot when the permanent magnet synchronous motor accelerates from a standstill to the field weakening region, resulting in torque fluctuations and affecting dynamic response.

Method used

By adopting a reference voltage-based adaptive reduction method, the theoretical maximum torque is obtained by looking up a table through the simultaneous torque equation and current constraint equation. The torque ratio and speed ratio parameters are calculated in real time, and the reference voltage adaptive coefficient is dynamically adjusted. The reference value of the inverter's inner circle voltage is also dynamically adjusted to achieve smooth control of the field weakening transition zone.

Benefits of technology

It effectively suppresses voltage overshoot, reduces the sudden change amplitude of d-axis current, reduces electromagnetic torque fluctuation, and improves the operating stability of the high-speed weak magnetic region, making it suitable for precision drive scenarios that are sensitive to torque pulsation.

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Abstract

The application provides a permanent magnet synchronous motor weak magnetic transition area smooth transition method and system based on a reference voltage adaptive reduction, and belongs to the field of permanent magnet synchronous motor control. The method solves the problem of torque fluctuation caused by voltage overshoot in the existing voltage closed-loop weak magnetic control with a fixed reference voltage. The method comprises the following steps: obtaining a theoretical maximum torque according to a preset current limit value by simultaneously solving a torque equation and a current constraint equation; calculating torque ratio parameters and speed ratio parameters in real time; calculating a reference voltage adaptive coefficient based on an adaptive smooth transition algorithm; multiplying the adaptive coefficient by the inscribed circle voltage of an inverter to dynamically adjust the reference value of the voltage closed loop, so that smooth control of the weak magnetic transition area is realized. The method is mainly used in the fields of electric aircrafts, electric vehicles and robots.
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