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为提高终端滑模控制中状态变量的全局快速收敛性,提出一种自适应变速指数趋近律.该趋近律引入状态变量的一阶范数,根据状态变量距离平衡点的远近自适应调整指数趋近速度和等速趋近速度,从而实现缩短趋近时间的同时削弱系统抖振.应用该趋近律设计无轴承永磁同步电机(BPMSM)转子速度及径向位移非奇异终端滑模控制器,仿真结果表明,该方法能快速地跟踪转速及径向位移给定值,系统超调及稳态静差小,具有较强的鲁棒性.
In order to improve the global fast convergence of the state variables in the terminal sliding mode control, a near-law adaptive speed index is proposed. The approach introduces the first-order norm of the state variables and adaptively adjusts the distance equilibrium point according to the state variables Exponential approach velocity and constant velocity approach velocity so as to shorten the approaching time and weaken the system chattering at the same time.Using this approach to design a BPMSM rotor speed and radial displacement non-singular terminal sliding mode The simulation results show that this method can quickly track the given values of rotational speed and radial displacement, the system overshoot and steady state static error are small, and has strong robustness.