电感式角度传感器电磁耦合敏感元件的研究

Electromagnetic coupling sensitive element for inductive angle sensor

针对传统角度传感器结构复杂、制造成本高,且不易于嵌入式安装等不足,设计研究了一种基于PCB板的平面电感式角度传感器上的电磁耦合敏感元件。分析了此电感式角度传感器的实现机理,根据实现机理,建立了理论模型;在ANSYS Maxwell软件中创建了激励线圈、接收线圈和转子的实体模型,并进行了电磁耦合仿真分析,仿真结果验证了设计的合理性与可行性。根据理论模型制作原型敏感元件,在角度传感器实验台上进行电磁耦合实验,得到转子转动角度与接收信号峰峰值变化的对应关系,分析其影响因素。改进设计,对改进型敏感元件进行电磁耦合实验,实验结果表明改进型敏感元件提高了角度检测的灵敏度,3组接收信号峰峰值变化曲线中间部分线性度良好,且能完整覆盖一个变化周期。

Aiming at the problem of the complicated structure,high production cost and uneasiness for embedded installation of traditional angle sensor,the design studied the electromagnetic coupling sensor of PCB-based inductive angle sensor plane. It analyzed the implementation mechanism of the inductive angle sensor and established the theoretical model based on it. The analysis was conducted on the implementation mechanism to establish the excitation coil,the receiver coil and the rotor with ANSYS Maxwell. Then,electromagnetic coupling simulation and analysis were carried out. The simulation results verified the design was reasonable and feasible. Prototype sensor was produced based on the theoretical model and electromagnetic coupling experiments were carried out on the angle sensor bench. Thereby,the correspondence between the angle of rotation of the rotor and peak-to-peak variation of the receive signals was obtained. Based on it,the influencing factors were analyzed,thus the design can be improved based on it. The electromagnetic coupling experiments of the improved design were carried out on the improved sensors. The experimental results indicate that improved sensors raise the sensitivity of angle detection. The linearity of the middle part of 3 groups of received signal peak-to-peak curve is good,and they can cover a full change circle.