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Design Consideration of Back-EMF Constant for 3-D.O.F. Spherical PM Motor
Journal of Magnetics, Volume 15, Number 2, 30 Jun 2010, Pages 78-84
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.
Keywords: design; spherical motor; back-EMF; 3 degree of freedom
DOI: 10.4283/JMAG.2010.15.2.078
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