关键词: 无刷直流电机, 模型预测占空比补偿量控制, 混合补偿机制, 换相转矩脉动价值函数, 占空比补偿量自适应预测

Abstract: A model predictive compensatory duty cycle control algorithm was proposed to suppress the commutation torque ripple of brushless DC motor. A hybrid compensation mechanism was put forward, where the controlled switch of the off-going phase and the controlled upper switch in the on-going and non-commutation phases were taken as the control objects, with their driving duty cycles being compensated.The cost function of commutation torque ripple was constructed based on the deviation of electromagnetic torque between the overall commutation process and the beginning of commutation, and the constraint condition of no commutation torque ripple was obtained with the goal of minimizing the cost function. The adaptive prediction of duty cycle compensation was carried out. In this process, the current differential equation was established according to the circuit model of commutation, the relationship between duty cycle compensations was predicted combined with the constraint condition of no commutation torque ripple, and an adaptive adjustment factor was also introduced to adaptively distribute the values of duty cycle compensations. Experimental results verified the effectiveness of the proposed algorithm.

Key words: brushless DC motor(BLDCM), model predictive duty cycle compensation control(MPDCCC), hybrid compensation mechanism, cost function of commutation torque ripple, adaptive prediction of duty cycle compensation