Electromagnetic coupling sensitive element for inductive angle sensor

XV Hanbin, JIA Anli, ZHAO Wuguang

（School of Mechanical and Electrical Engineering , Wuhan University of Technology, Wuhan 430070, China）

Abstract: 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.

Key words: angle sensor; sensitive element; electromagnetic coupling; print circuit board (PCB)