基于抗饱和PI控制器和占空比调制的直线游标永磁电机直接推力控制

Direct thrust force control of linear vernier PM motor based on antiwindup PI controller and duty ratio modulation

针对直线游标永磁电机控制系统存在的非线性饱和及推力脉动大等问题,提出一种基于抗饱和PI控制器及占空比调制的改进式直接推力控制方法.该控制器采用变结构的积分环节,能快速退出饱和区.在分析电压矢量对电磁推力的影响基础上,采用开关频率固定的占空比调制方式.仿真与实验结果表明,所提出的改进式直接推力控制方法能有效减小系统的超调量和推力脉动,提高系统的稳定性和鲁棒性.

Due to the nonlinear saturation and high thrust force ripples in linear vernier permanent-magnet motor drive, an improved direct thrust force control strategy based on the anti-windup PI controller and duty ratio modulation is proposed.The variable-structure is adopted in the proposed controller, which can make the system quickly exit saturation zone. Duty ratio modulation with a constant switching frequency is adopted based on the analysis of effects that voltage vector has on thrust force ripples in the control strategy. The simulation and experimental results show that the proposed improved direct thrust force control system can effectively reduce the systemic overshoot and thrust ripples, thus improving the stability and robustness of the control system.