Magnetic bearing compressor and its shutdown control method

CN117404307BActive Publication Date: 2026-10-16GREE ELECTRIC APPLIANCE INC OF ZHUHAI
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Patent Information

Application Number
CN202311297931.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-10-09
Publication Date
2026-10-16
Estimated Expiration
2043-10-09

AI Technical Summary

Technical Problem

磁悬浮压缩机在停机瞬间会受到气流的强烈冲击，导致轴承精度变差

Benefits of technology

[0023]This invention provides a shutdown control method for a magnetic levitation bearing compressor. The method detects the discharge pressure when the compressor stops. If the discharge pressure exceeds a pressure threshold, it indicates that the actual discharge pressure of the compressor is too high. Stopping the compressor at this point results in significant impact and interference from the airflow on the rotor impeller, making the rotor uncontrollable. A first control unit is required for control. This first control unit controls the magnitude of the electromagnetic force, increasing it as the discharge pressure increases. The electromagnetic force is used to control the rotor to levitate at a specific position. As the discharge pressure increases, the electromagnetic force also increases, ensuring stable rotor operation. This shutdown control method increases the compressor's impact resistance without altering its original structural design, making it widely applicable to magnetic levitation bearing compressors with different speeds and discharge pressures.

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Abstract

The application provides a magnetic suspension bearing compressor and a shutdown control method thereof. The shutdown control method comprises the following steps: when the exhaust pressure of the compressor during shutdown is greater than a pressure threshold, a displacement sensor detects the rotor displacement in the compressor and transmits the rotor displacement to a first control unit, the first control unit outputs an electromagnetic force capable of suspending the rotor according to the rotor displacement, the electromagnetic force is proportional to the exhaust pressure of the compressor during shutdown, and the first control unit outputs the electromagnetic force according to the rotor displacement and bearing control parameters. The application can combine the exhaust pressure of the compressor during shutdown to regulate and control the electromagnetic force, and the impact resistance of the magnetic suspension bearing compressor is improved.
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