CAPACITANCE MINIATURIZED MOTOR DRIVING SYSTEM, AND OVERVOLTAGE PREVENTION CONTROL METHOD AND DEVICE THEREFOR

摘要

Disclosed are a capacitance miniaturized motor driving system, and an overvoltage prevention control method and device therefor. The method comprises the following steps of: acquiring a mechanical angle of a compressor motor, and performing, according to the mechanical angle, torque compensation on the compressor motor so as to obtain an initial torque compensation amount of the compressor motor (S1); acquiring a direct current bus voltage of the compressor motor, and correcting, according to the direct current bus voltage, the initial torque compensation amount so as to obtain a corrected torque compensation amount of the compressor motor (S2); calculating a given value of a total peak torque of the compressor motor according to a given rotational speed of the compressor motor, a rotational speed estimation value of a rotor of the compressor motor and the corrected torque compensation amount (S3); and controlling, according to the given value of the total peak torque, the compressor motor (S4). The method corrects, according to the direct current bus voltage, the initial torque compensation amount of the compressor motor, and thus can effectively avoid an overvoltage phenomenon caused by performing torque compensation on the compressor motor.