Design and Development of a Variable Reluctance-Based Thin Planar Angle Sensor

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Name of the Speaker: A. S. Anil Kumar (EE19D012)
Name of the Guide: Dr. Boby George
Co-Guide : Dr. Subhas Mukhopadhyay
Date/Time: 23rd November 2022, 10.30 a.m

Angle sensors that are thin and insensitive to dust, oil, and moisture, are highly in demand in industry, particularly for automotive, robotic, and aerospace applications. Although numerous angle sensors based on various measurement mechanisms have been reported, most of them have disadvantages such as bulkiness, needs complex or specialized manufacturing processes, sensitivity to misalignments, and noticeable power consumption. In this talk, a new, thin non-contact angle sensor based on the variable reluctance technique will be presented. The proposed sensor has a disc-shaped eccentric rotor and a stator with two printed circuit boards with circular coils. These parts are easy to manufacture using established but less expensive processes. The rotor and stator are positioned such that the inductances of the coils change as the angle changes. The inductance values are processed using a simple algorithm to obtain the sensing angle. For the stator, a dual coil structure is employed which ensures negligible sensitivity to the axial movement of the rotor. The sensor was designed with the help of finite element analysis. A prototype of the sensor has been built and tested. Static and dynamic performance tests were performed on the prototype. The resolution and worst-case linearity error of the prototype were found to be 0.06 o and 0.7% respectively. The features and performance factors of the sensor are apt for industrial and automotive applications. The details will be presented in the talk.