Soft Magnetic Ribbon Vitrovac 6025F Coated on LVDT Core for Sensitivity Enhancement
Lazuardi Umar, Yuliansyah Bahari Simanjuntak, Rahmondia Nanda Setiadi, Adriel Fadhlurrahman Lazuardi

University of Riau

Abstract

The study of improvement of a Linear Variable Differential Transformer (LVDT) sensor is presented in this paper. The LVDT sensor is a non-contacting position sensor used to measure linear displacement pressure, force, level, flow, and other physical quantities in engineering applications and industries. The commercially available LVDT in the market has a weakness on the symmetry phase due to unbalanced secondary coils, as well as on the limited sensitivity. In this study, the sensitivity of the LVDT sensor was increased using a soft magnetic material Vitrovac 6025F with a high permeability value and a phase adjustment circuit. The sensitivity produced by the LVDT sensor with the soft magnetic material was increased by 84.21% compared to without using the material. The phase adjustment of the electronic circuit provided an increasing maximum output of 48.48 mV per mm with -10 deg phase shift when an excitation signal with an amplitude of 1.0 V and frequency of 6 kHz was applied. COMSOL simulations were carried out for data validation of the soft magnetic material coating on the LVDT core, which showed an increase of generated magnetic field.

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Topic: Instrumentation and Computational Physics