한국정밀공학회지 (Journal of the Korean Society for Precision Engineering)

  • 제25권3호
  • /
  • Pages.83-92
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  • 2008
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  • 1225-9071(pISSN)
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  • 2287-8769(eISSN)
한국정밀공학회 (Korean Society for Precision Engineering)
권호 표지

자기연성을 이용한 동극형 자기베어링의 고장강건 제어

Fault Tolerant Homopolar Magnetic Bearings with Flux Coupling

  • 나언주 (경남대학교 기계자동화공학부)
  • 발행 : 2008.03.01
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초록

This paper develops the theory for a fault-tolerant, permanent magnet biased, homopolar magnetic bearing. If some of the coils or power amplifiers suddenly fail, the remaining coil currents change via a novel distribution matrix such that the same magnetic forces are maintained before and after failure. Lagrange multiplier optimization with equality constraints is utilized to calculate the optimal distribution matrix that maximizes the load capacity of the failed bearing. Some numerical examples of distribution matrices are provided to illustrate the theory. Simulations show that very much the same dynamic responses (orbits or displacements) are maintained throughout failure events (up to any combination of 3 coils failed for the 6 pole magnetic bearing) while currents and fluxes change significantly. The overall load capacity of the bearing actuator is reduced as coils fail. The same magnetic forces are then preserved up to the load capacity of the failed.

키워드

참고문헌

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