无刷直流电机（BLDCM）驱动系统应用于多电/全电航空飞行器，为电动燃油泵、冷却泵和电动刹车等提供动力输出。为满足BLDCM在复杂的电磁干扰以及极端温度等特殊环境工作的要求，提出了基于变结构控制策略的滑模反电动势观测器实现电机无位置传感器控制。使用变趋近律代替了传统滑模反电动势观测器的固定增益，并通过锁相环(PLL)得到电机转子位置和转速信息。仿真结果表明该方法可以有效抑制反电动势观测值的抖振，实现电机在中高速段的稳定运行，满足系统的快速性和鲁棒性要求。

Brushless DC motor (BLDCM) drive system is applied in multi-electric/all-electric aircrafts to provide power output for electric fuel pump, cooling pump and electric brake. In order to meet the special working environments such as complex electromagnetic interference and extreme temperature, a sliding mode back electromotive force (EMF) observer based on variable structure control strategy is proposed to realize the position sensorless control of motor. The variable reaching law is used to replace the fixed gain of the traditional sliding mode back EMF observer, and the rotor position and speed information of the motor are obtained through the phase-locked loop (PLL). The simulation results show that the method can effectively suppress the chattering of the observed value of back EMF, realize the stable operation of the motor in the middle and high speed stage, and meet the requirements of rapidity and robustness of the system.

TM341

国家自然科学基金项目（51967012）