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Korea Institute of Electronic Communication Science (한국전자통신학회)
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Improved Torque Ripple Through Pole Piece Deformation of Gear Ratio Transformed Magnetic Gear

폴피스 변형을 통한 기어비 변환형 마그네틱 기어의 토크 리플 개선

  • 변범석 (조선대학교 전기공학과) ;
  • 박의종 (조선대학교 전기공학과) ;
  • 김용재 (조선대학교 전기공학과)
  • Received : 2023.12.12
  • Accepted : 2024.02.17
  • Published : 2024.02.29
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Abstract

This paper introduces a study on an electromagnet magnetic gear designed for gear ratio conversion. In comparison to magnetic gears using permanent magnets, this electromagnet magnetic gear exhibits lower torque density, highlighting the need for torque density improvement. To address this, the research focuses on enhancing torque density by examining the consistent orientation of each rotor's magnetization during gear ratio conversion and attaching permanent magnets accordingly. However, an issue arises due to the uneven magnetic flux density caused by the non-uniform attachment of permanent magnets, leading to an increase in torque ripple. Therefore, building upon previous studies aimed at reducing torque ripple in electromagnet magnetic gears, this research explores the optimal methods, such as pole piece bridges and fillet configurations, to mitigate torque ripple even during gear ratio conversion.

기어비 변환을 목적으로 설계한 전자석 마그네틱 기어는 영구자석을 이용한 마그네틱 기어와 비교해 낮은 토크 밀도를 가져 토크 밀도의 개선이 필요하다. 이를 보완하고자 기어비 변환 시 각각의 회전자의 자화 방향이 일정한 치를 확인하여 이에 영구자석을 부착해 부족한 토크 밀도를 높이는 연구를 진행했다. 하지만 영구자석이 고르게 부착되지 않으면서 발생한 자속밀도의 불균일로 인해 토크 리플이 증가하는 현상이 문제점으로 발생 되었다. 따라서 전자석 마그네틱 기어의 토크 리플을 감소시키고자 진행된 선행연구를 토대로 폴피스 브릿지, 필레 방식을 적용하여 기어비 변환을 하더라도 각각의 토크 리플을 개선할 수 있는 최적의 방법을 모색하고자 한다.

Keywords

Acknowledgement

이 논문은 조선대학교 학술연구비의 지원을 받아 연구되었음(2022).

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