基于低分辨率位置传感器的电动汽车用轮毂电机的控制

Controlling of wheel motor in electric vehicle with low resolution hall effect sensors

为了提高低分辨率位置传感器电机系统中的转子位置和转速估算精度,介绍了采用低分辨率霍尔位置传感器估算转子位置和转速的基本原理和方法,讨论并且比较了为提高估算精度所采取的不同策略,并结合电动汽车轮毂电机永磁体极对数较大的特点,提出了线性转子位置校正的方法以及自动边界位置补偿法,以抑制因电机霍尔位置传感器安装偏差导致的转子位置估算误差。并搭建了以TMS320F28035为核心的系统实验平台,通过与同轴连接的光电编码器信号进行比较分析,对提出的算法进行了实验研究。实验结果表明,该算法能够有效提高永磁同步轮毂电机转子位置和转速的估算精度,使系统的动态和稳态性能得到改善,并且为今后该算法在电动汽车上的应用打下了良好的基础。

In order to improve the accuracy of rotor position and speed estimated by low resolution Hall effect sensors,several different methods to obtain high resolution rotor position from the low resolution Hall sensors were described and compared with experimental test.Then a novel method to adjust rotor position gradually rather than immediately force to reference angle while sector switching and a new algorism to adjust reference angle automatically were proposed.Finally,a drive system was set with a control software coded based on TMS320F28035 as a platform to test the algorism.The experimental results indicate that the new method is capable of improving rotor speed and position with higher accuracy and lower error.And it lays a good foundation for further experiment in electric vehicle applications.