Method and device for controlling motor, vehicle, storage medium and program product

CN122371780APending Publication Date: 2026-07-10XIAOMI TECH (WUHAN) CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAOMI TECH (WUHAN) CO LTD
Filing Date
2026-04-27
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In electrolytic capacitor-free motor drive systems, the periodic fluctuations in bus voltage make it impossible for existing overmodulation methods to accurately determine the modulation region, resulting in chaotic motor output voltage waveforms, increased harmonics, and affecting motor operating stability and output capability.

Method used

By extracting the AC fluctuation component of the reference voltage vector, the rated voltage of the bus is compensated, a dynamic bus voltage is constructed, the target modulation region is determined, and the motor is driven according to the region to achieve a smooth transition and avoid increased hardware costs.

Benefits of technology

Without increasing hardware costs, it improves the control precision and operational stability of the motor, ensures a smooth transition between different modulation zones, and enhances the motor's maximum output capacity and voltage utilization.

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Abstract

This disclosure relates to a motor control method, apparatus, vehicle, storage medium, and program product, belonging to the field of motor control technology. The method includes: acquiring a target motor's bus rated voltage and a reference voltage vector; determining an AC fluctuation component in the reference voltage vector; compensating the bus rated voltage based on the AC fluctuation component to obtain a target bus voltage; determining a target modulation region corresponding to the reference voltage vector based on the bus rated voltage, the reference voltage vector, and the target bus voltage; and driving the target motor based on the target modulation region. Since the target modulation region is determined considering bus voltage fluctuations, a smooth transition can be achieved between different modulation regions, improving the motor's control accuracy and operational stability without increasing hardware costs.
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