An effective approach to predict performances of high speed BLDC motors in hard disk drives

As the speed of the BLDC motors in hard disk drives has been increased from 3,600 rpm to 15,000 rpm, the phase commutation of the motor and the MOSFET switches of inverter influence the spindle motor performances obviously, for examples, the torque ripple and efficiency of the motor. In this paper, an effective approach of BLDC spindle motor system is presented to predict the performance of BLDC motors accurately. Both the characteristics of the spindle motor and MOSFET switches of the inverter can be taken into account in the simulation. The experimental results confirmed the effectiveness of the proposed method.