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Torque control of BLDCM based on predictive current control |
Beijing Institute of Mechanical Equipment, Beijing 100854, China |
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Abstract To reduce torque ripple of brushless DC motor (BLDCM) control system, two torque control methods were proposed based on predictive current control of BLDCM with trapezoidal back electromagnetic fields (EMF). According to the characteristics of trapezoidal back EMF, an extended PARK transformation was used to make torque value proportional to current and to transform torque control into current control. Based on 120 degree commutation mode and hybrid commutation mode, two predictive current control methods were proposed by current calculating of the next control cycle through mathematical model analysis of BLDCM and by voltage vector choosing through values comparison of a cost function. The simulation results show that both of the proposed methods can successfully control current and speed of BLDCM with rapid torque response and low torque ripple.
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