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http://dx.doi.org/10.14775/ksmpe.2021.20.09.011

Finite Element Analysis of the Effects of Process and Material Parameters on the LVDT Output Characteristics  

Yang, Young-Soo (Department of Mechanical Engineering, JNU)
Bae, Kang-Yul (Department of Mechatronics Engineering, GNU)
Publication Information
Journal of the Korean Society of Manufacturing Process Engineers / v.20, no.9, 2021 , pp. 11-19 More about this Journal
Abstract
Linear variable differential transformer (LVDT) is a displacement sensor and is commonly used owing to its wide measurement range, excellent linearity, high sensitivity, and precision. To improve the output characteristics of LVDT, a few studies have been conducted to analyze the output using a theoretical method or a finite element method. However, the material properties of the core and the electromagnetic force acting on the core were not considered in the previous studies. In this study, a finite element analysis model was proposed considering the characteristics of the LVDT composed of coils, core, magnetic shell and electric circuit, and the core displacement. Using the proposed model, changes in sensitivity and linear region of LVDT according to changes in process and material parameters were analyzed. The outputs of the LVDT model were compared with those of the theoretical analysis, and then, the proposed analysis model was validated. When the electrical conductivity of the core was high and the relative magnetic permeability was low, the decrease in sensitivity was large. Additionally, an increase in the frequency of the power led to further decrease in sensitivity. The electromagnetic force applied on the core increased as the voltage increased, the frequency decreased, and the core displacement increased.
Keywords
LVDT; Output Characteristic; Supply Power; Core Material; Finite Element Analysis;
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