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为改善永磁同步电机在干扰下的速度调节,提出了一种基于非奇异终端滑模控制的非线性控制方法。引入一个非奇异终端滑模面,以解决普通终端滑模控制存在的奇异问题,且使跟踪误差在有限时间内收敛到零,以此设计一个速度跟踪控制器。为削弱由不连续切换项引起的抖振,用连续双曲正切函数替代符号函数。与PI控制相比,该控制方法对负载扰动有更强的鲁棒性。仿真验证该控制方法的跟踪性能。仿真结果表明,该控制方法比PI控制方法有更好的动态和稳态性能。
To improve the speed regulation of PMSM under disturbance, a nonlinear control method based on non-singular terminal sliding mode control is proposed. A non-singular terminal sliding mode surface is introduced to solve the singularity problem of ordinary terminal sliding mode control, and the tracking error converges to zero within a finite time to design a speed tracking controller. In order to weaken the chattering caused by the discontinuous switching term, the sign function is replaced by the continuous hyperbolic tangent function. Compared with PI control, this control method is more robust to load disturbances. Simulation verifies the tracking performance of this control method. Simulation results show that this control method has better dynamic and steady-state performance than PI control method.