Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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A Study on Electromagnetic-Spring Actuator for Low Cost Miniature Actuators

소형 및 저비용화를 위한 전자석-스프링 구동장치 연구

  • Kim, Sewoong (The 1st Research and Development Institute, Agency for Defense Development) ;
  • Lee, Changseop (The 1st Research and Development Institute, Agency for Defense Development) ;
  • Choi, Hyunyoung (The 1st Research and Development Institute, Agency for Defense Development)
  • 김세웅 (국방과학연구소 제1기술연구본부) ;
  • 이창섭 (국방과학연구소 제1기술연구본부) ;
  • 최현영 (국방과학연구소 제1기술연구본부)
  • Received : 2018.12.14
  • Accepted : 2019.05.31
  • Published : 2019.06.05
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Abstract

This paper provides a fin actuation system of missile based on electromagnetic-spring mechanism to miniaturize the system and lower the cost. Compared with proportional electro-mechanical actuators, the output of Electromagnetic-Spring Actuators(EMSA) has two or three discrete states, but the mechanical configuration of EMSA is simple since it does not need power trains like gears. The simple mechanism of EMSA makes it easy to build small size, low cost, and relatively high torque actuators. However, fast response time is required to improve the dynamic performance and accuracy of missiles since bang-off-bang operation of EMSA affects the flight performance of missile. In this paper the development of EMSA including parameter optimization and mathematical modeling is described. The simulation results using Simulink and experimental test results of prototype EMSAs are presented.

Keywords

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Fig. 1. Operating motion of EMSA

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Fig. 2. Free body diagram of EMSA

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Fig. 3. Simulink model of EMSA

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Fig. 4. Analysis of electromagnetic flux

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Fig. 5. Distribution of magnetic flux density

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Fig. 6. Generating torque of spring force and electromagnetic force

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Fig. 7. Time response without degaussing current

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Fig. 8. Degaussing current control scheme

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Fig. 9. Time response with 2 ms degaussing current

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Fig. 10. Experimental test and simulation results for low frequency

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Fig. 11. Experimental test and simulation results for high frequency

Table 1. Design parameters of coils

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Table 2. Electromagnetic forces according to coil turns & diameters

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Table 3. Frequency response by springs

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References

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