A method of compressor torque compensation without electrolytic capacitor control

Abstract

The invention relates to a torque compensation method of a compressor without electrolytic capacitor control. An initial mechanical position of a compressor is located; a compensation angle is identified during first power-on operation of the system, an optimal compensation angle is calculated during second-time normal running of the system, a speed ripple is extracted and a torque ripple is filtered to extract a torque fundamental amplitude; and then according to the mechanical position of the compressor, the torque fundamental amplitude, and the optimal compensation angle, torque compensation is carried out. According to the method provided by the invention, the load torque angle and the load torque amplitude are tracked in real time to carry out torque compensation, so that no compensation angle determination error is caused and thus the debugging time of the torque compensation is reduced substantially. Moreover, the application range is wide and the stability is high.

Description

technical field [0001] The invention relates to the technical field of compressor control, in particular to a method for torque compensation of a compressor without electrolytic capacitor control. Background technique [0002] In recent years, inverter air conditioners have been popularized, because inverter air conditioners can change the speed of the compressor in a timely and convenient manner, so it can control the fluctuation of room temperature to be small, the indoor comfort is better, and it is more energy-saving. At present, the mainstream high-performance inverter air conditioner in the market adopts DC inverter technology, and its driving motor is a permanent magnet motor. The permanent magnet motor has obvious advantages, such as small size and high efficiency. Due to the low cost, the mainstream of air conditioner compressors below 2 horsepower are single-cylinder compressors. An obvious disadvantage of single-cylinder compressors is that the load is uneven an...

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Problems solved by technology

However, the calculation of this method is relatively complicated, and there are limitations on the application equipment, and the scope of application is small

In the Chinese Patent Application No.: 200910029260.0 "A Control Method for Injection Current Harmonic Compensation Permanent Magnet Motor Positioning Torque", an additional torque component is generated through the interaction of the injected harmonic shunt and the fundamental permanent magnet magnetic potential , yes, the amplitude of the fundamental wave and high-order harmonic components in the additional torque and the detent torque are equal, and the phases are opposite, which can cancel each other out, so as to achieve the purpose of compensating the detent torque, but for unstable fluctuations, especially for torque current There are 100Hz fluctuations, it is difficult to achieve real-time compensation

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