弱滑模观测器在无刷直流电机中的仿真研究

深入讨论了基于幂次趋近率方法的滑模观测器,并对一系列切换函数进行对比研究,总结出弱滑模观测器的规律.通过软硬件方式间接获得可靠的转子位置信号是无位置传感器无刷直流电机矢量控制的基础.在状态观测器设计法中,基于幂次趋近率方法的滑模观测器对电机启动时的反电动势信号具有跟踪速度快、观测精度高等特点,且算法结构简单,便于实现.仿真结果表明该方法在电机启动时反电动势信号微弱的情况下可以准确地估算反电动势信号,快速跟踪实际信号,并证明了该方法的正确性与有效性.

Simulation of Slow Sliding Mode Observer in Brushless DC Motor

The sliding mode observer based on the exponential approaching method is discussed in depth.By comparing a series of switching functions,the regular patterns of the slow sliding mode observer are summarized.Using hardware or software to indirectly obtain reliable signals for rotor positions is the basis of the vector control of brushless DC motors with no position sensors.When using the method of state observer,the sliding mode observer based on the exponential approaching method has the advantages of fast tracking and accurate observance of the back electromotive force signal at the time when a motor is started.Besides,the calculation is simple and easy to implement.The simulation results indicate that the method can accurately estimate the back electromotive force signal and fast track the actual signal even when the signal is very weak,and the correctness and effectiveness of the method are proved.