Dynamic performance of series-connected wound rotor induction motor

Series-connected induction motor has the ability of operation either at two speeds; the first one is less than the synchronous speed depending on the load, while the second speed is exactly double the synchronous speed. The motor has the capability of self-starting to reach the first speed. In addition to special arrangements required to attain the second (higher) speed, instability problems have been noted in experimental operation. This paper presents a complete dynamic analysis of motor when supplied from a variable voltage variable frequency power supply. The starting behavior has been presented as well as frequency change for both no-load and loaded conditions. Experimental results are given to check model validity in dynamic conditions.