A super-twisting sliding mode controller is developed for speed control of a brushless direct current motor using a nested scheme. The non-sinusoidal nature of the back electromotive forces in this electrical machine presents the need of a modification to Park transformation for accurate field orientation. An extension to Park transformation is used in this work that requires information from the back electromotive forces to compensate position and magnitude variations resulting from the transformation. To obtain the information needed in the modified transformation, a sliding mode observer is designed to estimate the back electromotive forces from the motor. To improve the performance of the controller, a nested sliding mode algorithm is implemented that allows robustness to unmatched perturbations such as load torque variations. Simulations are used to show the performance of the controller under similar real-time conditions with parametric and load torque variations.

中文翻译：

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反电动势无刷直流电机的超扭调速


开发了一种超扭转滑模控制器，用于使用嵌套方案对无刷直流电机进行速度控制。该电机中反电动势的非正弦性质表明需要对 Park 变换进行修改以实现精确的场定向。这项工作使用了 Park 变换的扩展，需要来自反电动势的信息来补偿变换导致的位置和幅度变化。为了获得修改后的变换所需的信息，设计了滑模观测器来估计电机的反电动势。为了提高控制器的性能，采用了嵌套滑模算法，该算法能够对负载扭矩变化等无与伦比的扰动具有鲁棒性。仿真用于显示控制器在具有参数和负载扭矩变化的类似实时条件下的性能。