基于DSP的无刷直流电机电流峰值控制

针对大功率无刷直流电机电流方波实现问题,提出一种在PWM_ON_PWM调制方式下的电流峰值控制策略,详细说明了该策略的控制原理,并给出了具体实施方案.该策略通过对非换相相电流的直接控制,提高了系统的反应速度,使得电机电流波形接近于理想方波,最终达到了减小电机转矩波动的目的.通过PLECS仿真工具,搭建无刷直流电机仿真模型,实现电流峰值控制方式的仿真.基于DSP控制芯片,搭建无刷直流电机电流峰值控制实验平台.仿真和实验结果显示,该控制策略不仅能实现方波控制,而且功率管开关频率可控.

Current Peak Control of Brushless DC Motor Based on DSP

To realize the square-wave current of high-power brushless DC motor (BLDCM)， a current peak control strategy using PWM_ON_PWM modulation mode was proposed and the control principle was described in detail. Then the concrete implementation plan was given. Through the direct control of the non-commutation phase current， the response speed of the system was improved and the desired square-wave current waveform was almost achieved， then the torque ripple of the motor was reduced finally. The simulation model of BLDCM was set up by PLECS to achieve the current peak control strategy. The experiment platform for current peak control of BLDCM was set up by DSP control chip. The simulation and experiment results showed that this control strategy can not only achieve the square-wave control， but also control the switching frequency of the power switching devices.