Comparative study and transient analysis of winding shapes in linear variable differential transformer

Abstract

LVDT is one of the most widely used position sensor. The shape of the winding in LVDT affects flux linkage between primary and secondary. This in turn affects the output voltage which is used to predict the position. The shape of the winding cannot be maintained uniform practically. This paper compares the voltage output of uniform and exponential shape winding implemented in the secondary of LVDT. The transient analysis is performed to study the real time impact of alternating current source and the mechanical motion on output voltage with respect to time. Hence transient analysis is done using Finite Element Electromagnetic tool which provides more accurate prediction when compared with static analysis.