单边直线感应电机法向力牵引力解耦控制

A Decoupling Control of Normal-and-thrust Forces in Single-sided Linear Induction Motor

单边直线感应电机(single-sided linear induction motor,SLIM)的法向力和牵引力可以通过初级和次级磁链的幅值和夹角表示。通过选择PWM变频器最优电压矢量、改变磁链的瞬态幅值及夹角,可以实现单边直线感应电机法向力和牵引力的解耦控制。由此可以将单边直线感应电机的法向力和牵引力分别用于直线电机车辆的悬浮及牵引控制,实现不设悬浮电磁铁的直线感应电机车辆的悬浮牵引同时运行。实验结果表明,在整个运行期间,悬浮牵引兼用直线电机车辆的悬浮气隙及运行速度均能快速的跟踪给定值,体现了良好的精度和稳定性能。提出的力解耦控制方案得到了较好的验证。

The thrust and normal forces are denoted by the amplitude and angle between primary-and-secondary flux linkage of single-sided linear induction motor （SLIM）. A decoupled-control of thrust and normal forces in SLIM is achieved by simultaneously adjusting the amplitude and the phase angle of the flux linkages according to the appropriate choices of voltage vectors in PWM inverter. So, the normal and thrust forces are applied independently to levitate and propel a SLIM maglev vehicle without additional levitation magnets. Experimental results show that levitation gap length and speed of the developed combined levitation-and-propulsion vehicle in our lab follow well with the commands during the running period, and the accuracy and stability are revealed. The effectiveness of proposed forces control scheme is verified.