无刷直流电机的分数阶滑模控制器设计

Design of Fractional Order Sliding Mode Controller for Brushless DC Motor

为了提高无刷直流电机(Brushless DC motor,BLDCM)的抗负载扰动性能和鲁棒性,削弱传统整数阶滑模控制(Sliding model control,SMC)中的抖振现象,针对BLDCM调速系统设计了一种分数阶(Fractional order,FO)滑模控制器。采用分数阶滑模面,同时利用分数阶传递能量缓慢的特性对具有二阶滑模特性的快速幂次趋近律进行改进,有效地削弱了滑模变结构控制带来的系统抖振。仿真结果表明,相比于传统整数阶滑模控制,所提方法可使BLDCM调速系统具有较好的控制性能。

In order to improve the anti-load disturbance performance,robustness of Brushless DC motor（BLDCM） and weaken the chattering in the traditional Sliding model control（SMC）,a novel fractional order（FO） sliding mode controller is proposed for BLDCM speed control system. The fractional order（FO） surface and an improved reaching law are indispensable to the design of the novel fractional order sliding mode controller. An improved fast power reaching law which has the characteristic of second-sliding mode is designed by utilizing the slower energy transferring property of FO. So,the system chattering caused by SMC can be effectively weakened. The simulations results show that the proposed method can make BLDCM speed control system have better control performance.