变速箱档位传感器磁场分析及结构设计

Magnetic Field Analysis and Structural Design of Gearbox Position Sensor

在汽车电子控制系统中,变速箱档位的位置信号是调节整车运行的重要参数。随着电子技术的发展,变速箱档位传感器在满足精度要求的前提下应尽量减小传感器体积。运用Flux和Matlab对永磁体周围空间的磁场强度分布进行仿真计算,综合分析单磁铁方案、双磁铁方案、正弦充磁磁铁方案三种设计方案在磁场强度、线性度、精度的表现,提出一种采用正弦充磁方式的变速箱档位传感器,分析实际装配中磁铁的尺寸及磁铁与霍尔芯片间隙对传感器测量角精度的影响,基于仿真结果优化设计了具有小体积高精度特点的正弦充磁变速箱档位传感器。

In the motor control system,the gearbox position signal is an important parameter to adjust the operation of the car.With the development of electronic technology,it is necessary to reduce the volume of the gearbox position sensor on the premise of meeting the requirements of accuracy.The finite element method is used to analyze the gearbox position sensor by using the FLUX and MATLAB to simulate the spatial distribution of magnetic induction intensity around permanent magnet.Comprehensively analyze the performance of the three design schemes of single magnet scheme,double magnet scheme and sinusoidal magnetization magnet scheme in magnetic field strength,linearity and accuracy,and then proposing agearbox position sensor based on sinusoidal magnetization.Analyze the effect of the size of the magnet and the gap between the magnet and the Hall chip on the measurement angle accuracy of the sensor in the actual assembly,The sinusoidal magnetization of gearbox position sensor with small volume and high accuracy was designed based on the simulation result.