基于线性霍尔传感器的角度测量的非线性校正方法研究

Approaches to non-linearity compensation of angle measurement system based on linear hall sensors

本文提出了一种基于线性霍尔传感器的角度测量的非线性校正方法,在固定磁铁上绕制一定匝数的线圈,线圈产生的磁场与磁铁产生的磁场垂直,空间磁场为上述两个磁场的叠加,固定霍尔传感器的位置,同时保持控制电流不变,让磁铁绕霍尔传感器旋转产生角度的变换,霍尔传感器输出电压也将产生变化。对增加线圈和不增加线圈两种结构进行理论分析和仿真,从仿真结果看,霍尔电压与夹角的关系曲线明显线性增加,测量范围扩大,在角度测量中具有独特的优点。同时设计了传感器硬件电路,进行了实验测量,仿真和实测结果表明:该方法具有电路简单、实时性好、频率相应快、抗干扰能力强、安装调试方便等特点。

An approach to non-linearity compensation of angle measurement system based on linear hall sensor was putted forward in this paper. This can be described that when some circles of coils were made in the fixed magnet, the magnetic field caused by the coils and caused by the magnet were both vertical. And the space magnetic field was stacked by the above two magnetic fields. By fixing the position of the hall sensor and keeping the control current constant, the angle generated by rotating the hall sensor changed while the output voltage of the hall sensor also changed. So theory analysis and simulation of two structures of increased coils and not increased coils were introduced in this paper. The results show that the linearity of the related curve between the voltage and angle was obviously increased and this method has excellent characteristics in angle measurement. At the same time, hardware circuit of hall sensor was also designed and measured. The results show that this method has excellent characteristics, such as the simple circuit, the quick survey speed, the strong anti-interference ability, the measuring accuracy and easy to install and operate.