关键词: 永磁同步电机, 直接转矩控制, 分数阶趋近率, 分数阶滑模控制器

Abstract:

An improved fractional order sliding mode controller was proposed to further reduce torque and flux ripple as well as system chattering, etc.in the direct torque control based on the sliding mode variable structure (SMVS-DTC).The characteristic of fractional order exponential function curve was analyzed, and a fractional order integral term in the design of sliding mode switching surface was introduced to reduce torque and flux ripple, while a new reaching law was combined fractional order differential equations with exponential reaching law was adopted to improve convergence rate and reduce overshoot during the transient process.Simulation results show that the improved fractional order sliding mode controller can significantly reduce system chattering, reach a steady state faster and have strong robustness to the interfering signal.

Key words: permanent magnet synchronous motor(PMSM), direct torque control(DTC), fractional order reaching law, fractional order sliding mode controller