永磁同步电动机转矩脉动抑制方法

Permanent-Magnet Synchronous Motor Torque Ripple Suppression Method

永磁同步电动机(PMSM)直接转矩控制(DTC)在传统的滞环控制框图中,因为滞环存在以及PMSM本身存在非线性、强耦合的特性,导致了PMSM出现转矩脉动大等问题。为了解决这些问题,引入了零矢量;为了使转矩脉动更小,运用具有光滑连续特性的双曲正切函数h(s)代替符号函数sgn(s)对二阶滑模控制器进行改进。将其引入控制系统中,同时也提高了系统的动态响应速度,从而极大地提高了系统的控制性能。

The direct torque control （DTC） of the permanent magnet synchronous motor（PMSM） is in the traditional hysteresis control block diagram. The existence of hysteresis and the existence of nonlinear and strong coupling characteristics of the permanent magnet synchronous motor result in the large torque ripple and other problems. In order to solve these problems,the zero vector is introduced here. In order to make the torque ripple smaller, the second-order sliding modecontroller is improved by using the hyperbolic tangent function h（s） with characteristics instead of the sign function sgn（s） to introduce it into tion, the system also improves the dynamic response speed of the systemthe control performance of the system.