基于改进滑模速度控制器的永磁直线同步电机直接推力控制

针对永磁直线同步电机(PMLSM)直接推力控制中存在的超调量大、抗负载扰动能力差、响应速度慢等问题,提出了一种改进的滑模控制速度调节器。该算法中滑模控制趋近律的设计在等速趋近律的基础上引入加权积分型增益的趋近律,能有效避免系统不在滑动模态阶段时切换增益的增大。仿真结果表明:与传统PI速度控制相比,采用改进后的滑模速度控制器应用在PMLSM直接推力控制系统中,系统速度在负载变化时的响应时间缩短、抗扰动能力明显提升,增强了PMLSM推力响应的抗扰动性能。

Direct Thrust Control of Permanent Magnet Linear Synchronous MotorBased on Improved Sliding Mode Speed Controller

An improved sliding mode control speed regulator was proposed for permanent magnet linear synchronous motor (PMLSM) direct thrust control system which had the defects such as large overshoot, poor load disturbance resistance, slow response and so on. The weighted integral gain reaching law was combined with the constant speed reaching law to reduce the increase of the switching gain when the system was not in the sliding mode phase. The simulation compared with PI controller showed that the response time of the system speed under load change was shortened, and the antidisturbance ability was improved obviously when the improved sliding mode speed controller was applied to the PMLSM direct thrust control system.