无轴承异步电机新型直接转矩控制研究

Research on a novel direct torque control for bearingless induction motor

针对无轴承异步电机(Bearingless Induction Motor,BIM)传统直接转矩控制中转矩脉动大,悬浮性能不佳等问题,提出了一种基于滑模变结构的直接转矩控制方法 (SMVS-DTC)。首先根据转矩误差和磁链误差构造出相应的滑模切换面,然后采用指数趋近律设计了直接转矩控制器。在此基础上对所提方法进行了仿真和实验研究。仿真和实验结果表明,该方法有效地减小了转矩脉动和磁链脉动,并且提高了BIM转速动态响应和稳定悬浮性能。

Aimed at the problems of the large torque ripple and unstable suspension performance in traditional direct torque control（DTC） for bearingless induction motor（BIM）,a new method of direct torque control was proposed based on sliding mode variable structure（SMVS-DTC）.Firstly,the sliding mode switching surfaces of the torque and flux linkage controller are constructed by the torque error and the flux error,and then the direct torque controller is designed by using the exponential reaching law.The simulation and experiment of the proposed method were carried out.The simulation and experiment results showed that the torque ripple and flux ripple are effectively reduced,and the dynamic response and suspension performance of the motor are improved.