Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Design Consideration of Back-EMF Constant for 3-D.O.F. Spherical PM Motor

  • Go, Sung-Chul (Department of Electrical Engineering, Hanyang University) ;
  • Kang, Dong-Woo (Department of Electrical Engineering, Hanyang University) ;
  • Im, Jong-Bin (Department of Electrical Engineering, Hanyang University) ;
  • Lee, Ju (Department of Electrical Engineering, Hanyang University) ;
  • Won, Sung-Hong (Department of Electric System, Dongyang Technical College) ;
  • Lim, Seung-Bin (Korea Institute of Energy Technology Evaluation and Planning)
  • Received : 2009.11.18
  • Accepted : 2010.03.05
  • Published : 20100600
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Abstract

A 3-D.O.F. spherical PM motor has 3 degrees of freedom in its motion by tilting and rotating of a shaft, which can be applied in a range of fields. The back-EMF is proportional to the field flux and angular velocity. The back-EMF constant in conventional rotating machine has a uniform value. However, in a spherical PM motor, the back-EMF constant of the coils varies according to the tilting conditions regardless of whether the angular speed is constant. Consideration of the back-EMF constant is useful for designing 3-D.O.F. spherical PM motors. In this study, the back-EMF constant of the spherical PM motor was considered carefully.

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References

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