Abstract
In industrial production, the installation of speed sensors is not conducive to the miniaturization of motor control systems and will increase production costs. In order to overcome the above defects and realize the stable operation of PMSM at low speed, this paper studies a method of detecting the rotor position of PMSM based on high frequency pulse voltage injection. The high frequency pulse injection method relies on the salient pole effect of the motor, injecting high frequency pulse voltage into the stator winding of the motor, and then collecting the corresponding high frequency response current. The collected high frequency current signal is processed mathematically to obtain the position information of the rotor. The simulation results show that this method can ensure the stable operation of motor at low speed.
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