Starting Performance of Synchronous Motors with Laminated Salient Poles

This general study of salient-pole features during starting of synchronous motors with laminated salient poles will give insight into the inherent possibilities and limits of this type of electrical machine to designers and users when applying any of the calculation methods. For that purpose the starting performance of a number of simplified synchronous motors is calculated and the connection between starting performance features and a few essential parameters is established. Amortisseur bar current distribution, constant and pulsating torque component, and field winding contribution are chosen as the characteristic starting features. Essential parameters are number and spread of amortisseur bars, average resistance and resistance distribution of amortisseur and field winding, and relative leakage reactance of the field winding. The current distribution is checked in a test machine.