开关磁阻电机的滑模变结构控制

针对开关磁阻电机存在磁场严重的非线性且数学模型不精确等问题,提出了一种滑模变结构控制方法。它主要是通过切换函数从而不间断地来回切换系统量,系统总约束在切换面上,然后系统的状态变量自动地滑到原点。利用滑模变结构控制的快速性和完全自适应性,设计了滑模变结构控制的开关磁阻电机调速系统,同时推导出了该方法的数学模型,最后编程实现并在实验台上调试。实验结果证明,与常规的控制策略相比,滑模变结构控制改善了系统的动态性能,有较强的鲁棒性,且在无需知道电机精确模型的情况下可有效克服转矩脉动。

Variable-structure control of switched reluctance motor

Aimed at the nonlinear magnetic field and the imprecise model of switched reluctance motor,the variable-structure control method with sliding mode is presented.It switches system variables continuously to restrict system in switch surface and force the state variable of system automatically sliding to the origin.A variable-structure control system with sliding mode for SRD(Switched Reluctance motor Drive system)is designed,which makes use of its rapidity and fully self-adaptability.Its math model is deduced and its implementation program is tested.The test result shows that,compared with traditional control strategy,the variable-structure control with sliding mode improves system dynamic performance and robustness,and reduces motor torque ripple effectively without knowing the precise model of motor.