High Precision Speed Digital Control System of BLDCM for CMG

This paper analyses the need of large spacecraft for Control Moment Gyro(CMG)motor.A digital control system of BLDCM is presented based on DSP.The control strategies for double closed-loop control and phase-locked loop control are analyzed respectively.Using this system the high precision speed control for high speed BLDCM is realized.Compared with analog system,the digital control system's loss is reduced greatly.In the end,the result and waveform of experiment are given.