This paper describes large turbine generator electromagnetic characteristics, considering harmonic components of the armature current, for a static frequency converter (SFC) start. Namely, the magnetomotive force for an SFC start is calculated, and frequency characteristics of higher harmonic magnetic flux and currents in a field circuit and a damper circuit are considered. Then the pulsating torque is analyzed, and the effects of the damper circuit toward the pulsating torque are considered. The results are as follows.
(1) When the fundamental frequency is more than about one hertz, the higher harmonic magnetic flux decrease, and vibration due to the electromagnetic force is insignificant.
(2) The eddy currents in each damper bar differ with each slot position and each angle between the armature fundamental magnetomotive force and the field fundamental magnetomotive force.
(3) The torque waveforms differ for each fundamental frequency.
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