基于矢量控制的BLDCM新型滑模控制器

针对反电动势为正弦波的直流无刷电机控制效率问题,研究了其控制方式,采用了矢量控制方法代替传统的方波控制,以提高电机运行效率,设计了一种新的指数趋近律积分型滑模控制器(sliding mode control,SMC),提高了直流无刷电机控制系统的抗干扰性及速度跟踪性。在滑模控制中引入新的趋近律可有效地抑制抖振问题,提高了滑模面的趋近速度,同时使得系统的超调得到显著的降低。采用了边界层可变的正弦饱和函数替代开关函数进一步削弱抖振,并对其进行了理论分析。最后根据所设计的控制方式通过Simulink进行了仿真验证。研究结果表明,所设计的速度控制器较传统的滑模控制器及积分型滑模控制器具有更好的抑制抖振和速度跟踪性能。

New sliding mode controller for BLDCM based on vector control technology

Aiming at the control efficiency of the sine wave brushless DC motor, the control mode was studied, and the vector control method was used to replace the traditional square wave drive to improve the efficiency of the motor. A new type of integral sliding mode controller with exponential approach law was designed to improve the anti jamming and the speed tracking of brushless DC motor control system. The chattering problem can be restrained effectively and the sliding mode reaching speed can be improved by the new reaching law, at the same time, the overshoot of the system was significantly reduced. The switching function was replaced by a sinusoidal saturation function with vari-able boundary layer, which was used to weaken the chattering, and the theoretical analysis was carried out. Finally, the design of the control method was proved by the Simulink simulation. The research results indicate that the design of the speed controller is better than the tradi-tional sliding mode controller and integral sliding mode controller in suppressing chattering and speed tracking performance.