Motor control method based on reduced-order flux linkage observer, controller and refrigerator

CN122178782APending Publication Date: 2026-06-09ANHUI MEIZHI COMPRESSOR CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ANHUI MEIZHI COMPRESSOR CO LTD
Filing Date
2024-12-09
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Under low-speed operation, the flux linkage model method in motor control is affected by changes in motor parameters and inverter nonlinearity, resulting in a large rotor position observation error, which makes it difficult to meet the requirements of low noise and low computational load.

Method used

A motor control method based on a reduced-order flux observer is adopted. The phase resistance is adjusted by determining the motor's power loss and running time, and the inductance is determined by combining the real-time current range. The results are then input to the reduced-order flux observer for control, thereby reducing the observation error of the rotor position.

Benefits of technology

It improves the control performance of the motor under low-speed operation, reduces observation errors, and enhances control accuracy.

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Abstract

This application discloses a motor control method, controller, and refrigerator based on a reduced-order flux linkage observer. The method determines the phase resistance adjustment value based on the motor's power loss and operating time. Then, based on the minimum phase resistance, it determines the real-time phase resistance of the motor according to the phase resistance adjustment value. It also determines the real-time inductance corresponding to the current range corresponding to the real-time current of the motor. The real-time phase resistance and inductance values ​​are then input as parameters to the reduced-order flux linkage observer. The estimated values ​​output by the reduced-order flux linkage observer are used to control the motor. By using the real-time phase resistance and inductance, the method avoids observation errors in rotor position caused by changes in motor parameters and inverter nonlinearity under low-speed operation, effectively improving the motor's control performance under low-speed operation.
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