Design of High-speed High Power Density Single-phase Permanent Magnet Brushless DC Motor Considering Control Performance

This paper points out that asymmetric air gap cause phase shift of cogging torque and electromotive force (EMF), which will affect motor performance. The method of adding phase compensation in control is proposed. In addition, a new structure of asymmetric air gap that can reduce torque ripple is proposed and used in design of high speed high power density single-phase permanent magnet brushless direct current (SPPMBLDC) motor. To reduce the stator iron loss and rotor eddy current loss caused by high frequency harmonics, 0.1 mm thick ultra-thin electrical steel sheet for the state core is used and the motor with sinusoidal EMF is designed. Finally, a 500 W, 100 000 r/min SPPMBLDC motor is designed and verified by finite element method. And the power density of this motor is calculated to be 32.15 kW/L (37.59 kW/kg).

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