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A current ripple reduction of a high-speed miniature brushless direct current motor using instantaneous voltage control

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2 Author(s)
D. -h. Lee ; Dept. of Electr. & Mechatron. Eng., Kyungsung Univ., Pusan ; J. -w. Ahn

High-speed miniature brushless direct current motor (BLDCM) is used in robots and medical applications because of its high-torque and high-speed characteristics. When compared with the general BLDCM, a high-speed miniature BLDCM has a low electrical time-constant. The current and torque ripple are very high when compared with the conventional pulse-width modulation (PWM) control scheme in the conduction period because of the inherent electrical characteristics. The authors propose a simple instantaneous source voltage and phase current control for torque ripple reduction of a high-speed miniature BLDCM. To reduce the switching current ripple, instantaneously controlled source voltage is supplied to the inverter system according to the motor speed and the load torque. In addition, a fast hysteresis current controller can keep the phase current within a limited band. Computer simulations and experimental results up to 40 000 rpm show the effectiveness and verification of the proposed control scheme.

Published in:

IET Electric Power Applications  (Volume:3 ,  Issue: 2 )