基于瞬时功率理论的无刷直流电机转矩控制

Torque Control of Brushless DC Motor on Instantaneous Power Theory

无刷直流电机的转矩脉动会带来噪声、震动等问题。在介绍无刷直流电机的数学模型基础上,引入了瞬时功率理论推导得到瞬时转矩与电流和磁链函数之间的关系。通过给定转矩和磁链函数得到相应的参考电流,并通过电流滞环控制,使实际电流跟踪参考电流以达到转矩恒定的目的。仿真与实验结果表明,与传统PWM调制控制策略相比,基于瞬时功率理论的转矩控制策略能有效地抑制无刷直流电机的转矩脉动。

The torque ripple of Brushless DC Motor （BLDCM） can bring some problems such as noise and vibration. On the basis of recommending the mathematical model of BLDCM, the paper introduced instanta- neous power theory, so the relation between torque, electric current and flux linkage function can be found. And according to the given torque and flux linkage function, got the corresponding reference current. By hysteresis current control, the actual current can track the reference current to make torque constant. The simulation and experimental results show that comparing with traditional PWM modulation control strategy, the torque control strategy on instantaneous power theory can inhibit torque ripple of BLDCM effectively.