摘要
直流电机转子运行测定时,主要通过多极性换相实现初始位置的估计,处理时磁链角容易出现偏置,导致初始位置的估计误差增加,精准度降低。为此,提出基于线间反电动势的无刷直流电机转子初始位置估计方法。在磁场背景下,通过电机电感的变化确定转子的位置,依据实时位置精准判断转子磁极极性。以单极性为条件标定出换相点,有效消除接入磁链时换相点对应磁链角的偏置,分析其与转子运行的内在规律,以完成高效换相处理。融合线间反电动势,设计换相后电机的法拉第同步辨识逻辑,依托该逻辑结合反电动势的磁通量变化率估计出转子初始位置。实验结果表明:所提方法对初始位置的估计误差均被控制在0.020 rad以内,均优于反步法和转子位置误差解耦阻抗建模法,凸显出位置估计准确性高的特点,说明其性能优越。
During the operation measurement of the DC motor rotor,the initial position is mainly estimated through multi-polar commutation.However,the flux linkage angle is prone to offset during processing,resulting in increased estimation error and decreased accuracy of the initial position.To address this issue,an initial position estimation method for the rotor of a brushless DC motor based on line to line back electromotive force was proposed.In a magnetic field environment,the position of the rotor was determined by the changes of motor inductance,and the magnetic pole polarity of rotor was accurately judged based on real-time position.Commutation points were calibrated under the condition of unipolarity to effectively eliminate the offset of the flux linkage angle corresponding to the commutation points when the flux linkage was connected.The inherent law between this offset and rotor operation was analyzed to achieve efficient commutation processing.Integrating the line to line back electromotive force,a Faraday synchronous identification logic for the motor after commutation was designed.Based on this logic and combined with the flux change rate of the back electromotive force,the initial rotor position was estimated.The experimental results show that the initial position using the proposed method is controlled within 0.020 rad,which is superior to the back stepping method and the rotor position error decoupling impedance modeling method,highlighting the high accuracy of position estimation and demonstrating its superior performance.
作者
杨清志
谭雨点
YANG Qingzhi;TAN Yudian(Department of Intelligent Engineering,Bozhou Vocational and Technical College,Bozhou 236800,China)
出处
《成都工业学院学报》
2025年第6期34-39,共6页
Journal of Chengdu Technological University
基金
安徽省教育厅自然科学重点项目(2022AH052582)
亳州职业技术学院重点教研项目(2023bzjyxmzd03)。
关键词
线间反电动势
无刷直流
电机转子
位置估计
line to line back electromotive force
brushless DC
motor rotor
location estimation
