Start-up and sensor/parameter error transients in field oriented induction machines

This paper presents a tutorial investigation of the dynamic behavior of AC induction machine (IM) indirect field orientation (IFO). Physically intuitive descriptions complimented with analyses and simulations are used to illustrate the dynamics of IM IFO. Specifically, the process of rotor flux build-up from zero under various conditions is investigated. Additionally, how IM IFO systems react to and recover from the effects of sensor errors and estimated machine parameter errors is investigated and illustrated. Complex vectors and their relationship to the controller and machine reference frames are used extensively for both mathematical rigor and intuitive illustrations. In particular, the relative orientation between the controller and actual machine reference frames is exploited for the purposes of tutorial exposition. Computer simulations and known steady state results are used to substantiate and verify the results. It is the goal of this paper to present physically insightful illustrations and explanations, tutorial in nature, of the dynamics associated with IM IFO.