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The authors examined the subject using the following two methods. (1 } Assuming that the induced bar currents are all of the same phase and are sinusoidally distributed when an alternating field is applied to the axis, the total power absorbed in the damper winding is obtained. The equivalent impedance is calculated with the power assumed to be due to the armature currents. (2) With an alternating field applied to the axis, voltage equations are set forth for a pair of bars at the symmetrical positions for each axis. Each bar current is obtained by simultaneously resolving these equations. The relation where the gap magnetomotive force by such currents is equal to the armature reaction magnetomotive force is used. The results of these two methods agreed well in the actual design. The starting performance of synchronous motors was calculated and compared with the measured values.

Equivalent impedance of damper winding in consideration of end ring impedance.