한국정밀공학회지 (Journal of the Korean Society for Precision Engineering)

  • 제26권3호
  • /
  • Pages.40-46
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  • 2009
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  • 1225-9071(pISSN)
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  • 2287-8769(eISSN)
한국정밀공학회 (Korean Society for Precision Engineering)
권호 표지

환형권선 BLDC 전동기의 강성계수 모델링

Stiffness Modeling of Toroidally-Wound BLDC Machine

  • 이현주 (충남대학교 BK21 메카트로닉스 사업단) ;
  • 유승열 (충남대학교 BK21 메카트로닉스 사업단) ;
  • 노명규 (충남대학교 메카트로닉스공학)
  • 발행 : 2009.03.01
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초록

Toroidally-wound brushless direct-current (BLOC) machines are compact, highly efficient, and can work across a large magnetic gap. For these reasons, they have been used in pumps, flywheel energy storage systems and left ventricular assist devices among others. The common feature of these systems is a spinning rotor supported by a set of (either mechanical or magnetic) bearings. From the view point of dynamics, it is desirable to increase the first critical speed of the rotor so that it can run at a higher operating speed. The first critical speed of the rotor is determined by the radial stiffnesses of the bearings and the rotor mass. The motor also affects the first critical speed if the rotor is displaced from the rotating center. In this paper, we analytically derive the flux density distribution in a toroidally-wound BLOC machine and also derive the negative stiffness of the motor, based on the assumption that the rotor displacement perturbs the flux density distribution linearly. The estimated negative stiffness is validated by finite element analyses.

키워드

참고문헌

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