Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Finite Element Analysis of the Effects of Process and Material Parameters on the LVDT Output Characteristics

LVDT의 출력 특성에 미치는 공정 및 재료 변수의 영향에 관한 유한요소해석

  • 양영수 (전남대학교 기계공학과) ;
  • 배강열 (경상국립대학교 메카트로닉스공학과)
  • Received : 2021.06.25
  • Accepted : 2021.07.22
  • Published : 2021.09.30
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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

Acknowledgement

This work was supported by Gyeongnam National University of Science and Technology Grant in 2020~2021.

References

  1. Lee, N.-G., Kwac, L.-K. and Kim, H.-G., "A Study on the Universal Outer Diameter Measurement Module using LVDT", Journal of the Korean Society of Manufacturing Process Engineers, Vol. 16, No. 3, pp. 100-106, 2017. https://doi.org/10.14775/ksmpe.2017.16.3.100
  2. Masi, A., Danisi, A., Losito, R., Martino, M. and Spiezia, G., "Study of Magnetic Interference on an LVDT: FEM Modeling and Experimental Measurements", Journal of Sensors, Vol. 2011, pp. 1-9, 2011.
  3. Al-Sharif, L., Kilani, M., Taifour, S., Issa, A. J., Al-Qaisi, E., Eleiwi, F. A. and Kamal, O. N., "Linear Variable Differential Transformer Design and Verification Using MATLAB and Finite Element Analysis, Matlab for Engineers", Edited by K. Perutka, IntechWeb.org, pp. 75-94, 2011.
  4. Baidwan, K. I. S. and Kumar, C. R. S., "Design of Linear Variable Differential Transformer (LVDT) Based Displacement Sensor with Wider Linear Range Characteristics", The International Journal of Science & Technoledge, Vol. 3, No. 4, pp. 74-79, 2015.
  5. Doebelin, E. O., Measurement Systems: Application and Design, McGraw-Hill, New York, 4 ed., 1990.
  6. Souza, C. P. and Wanderley, M. B., "Conversion from Geometrical to Electrical Model of LVDT", 16th IMEKO TC4 Symposium, Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements, pp. 22-24, Florence, Italy, 2008.
  7. Techical Report, Development of Domestic LVDTs for Precision Measurement, Korea Standards Research Institute, 1989.
  8. Techical Report, Basic Design of Radiation-Resistant LVDTs, Korea Atomic Energy Research Institute, 2008.
  9. Yanez-Valdez, R., Alva-Gallegos, R., Caballero-Ruiz, A. and Ruiz-Huerta, L., "Selection of Soft Magnetic Core Materials Used on an LVDT Prototype", Journal of Applied Research and Technology, Vol. 10, No. 2, pp. 195-205, 2012.
  10. Han, E.-G., Choi, M.-Y., Chang, K.-Y. and Noh, B.-W., Precision Measurement Technology, Dongil Press, Ch. 3, pp. 108-117, 1998.
  11. FluxTM 2020, 3D Applications User's Guide, Altair Engineering Inc., Troy, Michigan, USA, 2020.