The effect of tooth-width on the distribution of rotational core losses

This paper examines the effect of tooth-width in the mapping of pulsating, elliptical and rotational losses in a tooth body for a given slot-pitch. Core loss distribution in the tooth is done with the use of FEA and 2-D core loss measurement results. The core loss distribution is computed using two methods, i.e., pulsating losses assuming all the flux-density in the stator is pulsating and elliptical losses including rotational losses. The two are compared and discussed in detail. A methodology that reduces the FEA geometrical size for core loss analyses to a slot-pitch is also presented.