Pulling-Into-Step of Reluctance Synchronous Motors

The analysis of the pulling-into-step phenomena of salient-pole synchronous motors with dc field excitation gives unsatisfactory results when applied to reluctance motors (without dc field excitation). This difficulty can be overcome by taking the dynamics of the system into full consideration. By considering the rotor, the coupling, and the load as one dynamic system, satisfactory results can be obtained. It is found that the rigidity of the coupling plays a major role in the synchronization process. The analysis can be readily programmed on an analog computer and the effects of the various system parameters studied. Boundaries for the parameters within which synchronization takes place can be obtained; outside these boundaries the reluctance motor fails to pull-into-step.