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

다국어 초록 (Multilingual 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.

목차 (Table of Contents)

• ABSTRACT
• 1. Introduction
• 2. LVDT Modeling and Analysis
• 3. Results and Discussion
• 4. Conclusion
• REFERENCES

참고문헌 (Reference)

1 "Techical Report, Development of Domestic LVDTs for Precision Measurement" Korea Standards Research Institute 1989

2 "Techical Report, Basic Design of Radiation-Resistant LVDTs" Korea Atomic Energy Research Institute 2008

3 Masi, A., "Study of Magnetic Interference on an LVDT : FEM Modeling and Experimental Measurements" 2011 : 1-9, 2011

4 Yanez-Valdez, R., "Selection of Soft Magnetic Core Materials Used on an LVDT Prototype" 10 (10): 195-205, 2012

5 Han, E. -G., "Precision Measurement Technology" Dongil Press 108-117, 1998

6 Doebelin, E. O., "Measurement Systems: Application and Design" McGraw-Hill 1990

7 Al-Sharif, L., "Matlab for Engineers" IntechWeb.org 75-94, 2011

8 이능구, "LVDT를 이용한 범용 외경측정 모듈에 관한 연구" 한국기계가공학회 16 (16): 100-106, 2017

9 "FluxTM 2020, 3D Applications User's Guide"

10 Baidwan, K. I. S., "Design of Linear Variable Differential Transformer(LVDT)Based Displacement Sensor with Wider Linear Range Characteristics" 3 (3): 74-79, 2015

11 Souza, C. P., "Conversion from Geometrical to Electrical Model of LVDT" 22-24, 2008