基于SEPIC变换器的无位置传感器无刷直流电机换相误差校正  

Commutation error correction of position sensorless brushless DC motor based on SEPIC converter

作　　者：龚文倩 朱俊杰[1] 郑志安 蒋峰[1] 何明芳 Gong Wenqian;Zhu Junjie;Zheng Zhian;Jiang Feng;He Mingfang(College of Computer and Information Engineering, Central South University of Forestry and Technology, Changsha 410004, China)

机构地区：[1]中南林业科技大学计算机与信息工程学院

出　　处：《仪器仪表学报》2019年第5期109-117,共9页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金青年项目(61703441)资助

摘　　要：传统反电势法的滤波器硬件结构设计将导致无位置传感器无刷直流电机的换相误差,当换相误差较大时将大大降低系统的性能指标。针对换相误差造成系统换相转矩脉动、失步等问题,通过分析理想反电势过零点与实际反电势过零点间相位差值的关系,提出在增加单端初级电感变换器(SEPIC)前级驱动电路的基础上,采取PWM-0N-PWM调制方式,通过检测非导通相(即悬空相)电压与校准后的电压大小进行比较,获取换相信号,实现对换相误差的校正。相比于传统反电势法,只需检测一路相电压,在降低系统转矩脉动的同时,对换相误差进行精准校正。仿真与实验结果验证了所提出的换相误差校正策略在全速范围内的有效性。The filter hardware structure design of traditional back EMF method will lead to the commutation error of the position sensorless brushless DC motor. When the commutation error is large, the performance index of the system will be greatly reduced. Aiming at the problems of system commutation torque ripple and out-of-step caused by commutation error, the relationship between the ideal back-EMF zero-crossing point and the actual back-EMF zero-crossing point is analyzed;on the base of adding a single-ended primary inductor converter (SEPIC) pre-driver circuit, this paper adopts PWM-ON-PWM modulation method, which detects and compares the voltage value of the non-conducting phase (i.e., the suspended phase) and the calibrated voltage value, then a commutation signal is obtained and the commutation error correction is realized. Compared with the traditional back-EMF method, the proposed method needs only to detect one phase voltage, then the commutation error is accurately corrected and the torque ripple of the system is reduced at the same time. Simulation and experiment results verify the effectiveness of the proposed commutation error correction strategy in full speed range.

关 键 词：无刷直流电机 无位置传感器 换相误差 SEPIC电路 反电势过零点 

分 类 号：TM383[电气工程—电机]