无位置传感器无刷直流电机助力转向系统研究  

Research on Power Steering System of Automobile Sensorless Brushless DC Motor

作　　者：蔡小龙 杨雪春[1] 谭刚平[1] CAI Xiaolong;YANG Xuechun;TAN Gangping(School of Mechanical and Electrical,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学机电工程学院

出　　处：《微电机》2019年第8期77-82,共6页Micromotors

基　　金：江西省重点研发项目(20171BBE50037)

摘　　要：为了使汽车无位置传感器无刷直流电机助力转向系统可靠工作,需解决电机转子零初始位置信息获取和零起动两大关键技术问题。针对第一个问题,提出了先进行粗略定位,再进行精确定位,即先基于电感法原理,根据母线电流变化率的大小排序确定转子所处的扇区,再通电使转子旋转至该扇区边界线的方法;零起动时,以检测母线电流变化率差值在换区切换阀值内为换区依据。通过实验验证提出的准闭环起动方法具有转子初始位置定位效率高、快速准确的起动,能保证整个系统起动处于较为平稳的状态。In order to make the power steering system of automobile sensorless brushless DC motor work reliably,it is necessary to solve the two key technical problems of zero initial position information acquisition and zero start of the motor rotor.Aiming at the first problem,the method of roughly positioning and then precise positioning was put forward,that is,the sector of the rotor was determined according to the magnitude of busbar current change rate based on the principle of inductance method,and then the rotor was energized to make the rotor rotate to the boundary of the sector.In the case of zero startup,the change of busbar current rate difference in the switching threshold was taken as the basis for the change of busbar.The experimental results show that the proposed quasi-closed-loop startup method has the advantages of high initial rotor position positioning efficiency,fast and accurate startup,and can ensure the whole system to start in a relatively stable state.

关 键 词：无刷直流电机 无位置传感器 转子预定位 三相基准电压 换区比较阈值 

分 类 号：TM361[电气工程—电机]