摘要
传统内置式永磁同步电机无位置传感器控制策略存在初始位置检测精度低、磁极判断不准确等缺点,将引起电机起动失败、失步、反转等问题。采用高频正弦信号注入法提取位置信息需要使用多个滤波器,会带来时间延迟和幅值畸变等问题。该文提出了基于高频方波电压信号注入的初始位置检测法,在转子信息提取环节无需滤波器。通过向定子绕组注入方波信号,在PWM周期采样三次电流,对前后两次采样电流做差处理求出位置误差信号,可以准确地获取转子位置。实验表明该方法准确有效。
The traditional position sensorless control strategy for interior permanent magnet synchronous motor has a low accuracy in testing the initial position and inaccuracy in determining the magnetic pole, bring in lots of problems, such as failure in starting motor, step out and reversal. Using high-frequency sinusoidal signal injection method to extract position-related information requires several filters, leading to time delay, amplitude distortion and other problems. The initial position detection method based on high-frequency square-wave voltage injection was proposed in this paper and no filter was needed in the process of extracting rotor-related information. By injecting square-wave signals to stator winding, the currents were sampled for three times during the PWM period. The two successively sampled currents were compared to get position error signal so as to obtain the right rotor position. Experiments proved that this method was accurate and effective.
作者
吴婷
王辉
罗德荣
吴轩
邵俊波
Wu Ting;Wang Hui;Luo Derong;Wu Xuan;Shao Junbo(College of Electrical and Information Engineering Hunan University Changsha 410082 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第15期3578-3585,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金项目(51577052
51707062)
中国博士后科学基金项目(2016M602407)资助
关键词
内置式永磁同步电机
高频方波电压信号注入
非线性饱和特性
初始位置检测
Interior permanent magnet synchronous motor
high-frequency square-wave voltage injection
nonlinear saturation characteristics
initial position detection
