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To design high performance sensorless Brushless DC Motor control system, computer simulation technology is adopted to analyze the process of three-step starting process. Firstly, Park transform and Clark transforms are used to build the mathematical model of the first step, pre-position. To avoid striking current, a scheme of pre-position with gradually increasing bus voltage is proposed in the paper,...
Starting performance of refrigeration compressors is very important to compressors. The research on starting performance of rolling piston compressors is the research on starting performance of motors actually. An improved starting sheme was proposed in this paper. Simulation and experiment results indicate that the reliability and stability of the starting performance of compressor are improved.
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