基于改进型滑模观测器的高速无刷直流电机控制

Control of High Speed Brushless DC Motor Based on Improved Sliding Mode Observer

研究了高速无刷直流电机无位置传感器的控制方法;通过滑模状态观测器获知电机的反电势信号,估算电机的转速及换相信号。为了解决传统的滑模观测器在接近切换面时抖振过大,影响系统的性能的问题,研究将幂次趋近律结合到滑模观测切换函数中,既可以增大趋近响应速度,又能减小了抖振。再利用李雅普诺夫函数作为稳定判据,推导出观测器的增益取值范围,以保证系统趋近运动时的动态品质。利用Matlab仿真软件进行仿真分析,并搭建了高速电机控制系统实验平台进行实验验证。仿真和实验结果表明改进后的滑模观测器在切换过程中抖振明显减小,提高了系统的鲁棒性和有效性。

The control method of position sensor without high speed brushless DC motor is studied in this article;The counter electromotive force signal of the motor is obtained by sliding mode observer,so as to estimate the rotational speed and commutation signal of the motor.In order to solve the problem that the traditional sliding mode observer buffeting too large to affect the performance of the system when it close to the switching surface,it is possible to increase the approaching response speed and reduce the buffeting by combining the power convergence law into the sliding mode observation switching function,And the Lyapunov function is used as the stabilization criterion,and the gain range of the observer is deduced to ensure the dynamic quality of the system.Simulations were carried out using Matlab simulation software,and the experimental platform of high speed motor control system was experimentally verified.Simulation and experimental results show that the improved buffeting of the improved sliding mode observer is significantly reduced during the switching process,which improves the robustness and effectiveness of the system.