To increase the fault tolerant capability and reliability of the driving system for five-phase motor,the position sensorless control of five-phase preferment magnet BLDC(BrushLess DC) motor under singlephase open circuit fault is investigated.A novel decoupled fault tolerant motor model is introduced,and the field oriented control and cartier pulse width modulation under single-phase open circuit fault are realized.A sliding mode observer is used to estimate the fundamental back-EMF(ElectroMotive Force) of the five-phase motor.However,the 3rd harmonic winding and nonlinearity of electric inverter result in chattering harmonic in estimated back-EMF under the open circuit fault mode.To tackle this problem,an improved complex coefficient filter is proposed,which can replace the first-order low-pass filter in smoothing back-EMF without phase and magnitude distortions,and hereby can improve the accuracy of estimated position and enhance motor dynamic characteristics under sensorless control.The position sensorless control method under singlephase open circuit fault is performed on the experimental platform,and the effectiveness of the proposed control method is confirmed by experimental results.%为了增强五相电机驱动系统的可靠性和容错能力,对五相永磁无刷直流电机在单相开路故障下的无位置传感器控制技术进行了研究.引入一种新颖的五相电机开路模型,实现了在单相开路故障下的场定向控制及载波脉宽调制.并在此基础上,采用滑模观测器估算五相电机的基波反电动势.然而当五相电机开路在故障模式下运行时,三次谐波绕组及逆变器非线性等因素引起观测反电动势含有较强的抖震谐波.采用了一种改进型复系数滤波器,并取代了传统一阶低通滤波器,对观测反电动势基波分量进行无失真滤波,改善位置观测精度和无位置控制电机动态性能.在实验平台上实现了单相开路模式下的无位置控制技术,验证了其的有效性.
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