DYNAMIC MODEL OF INDUCTION MOTORS FOR VECTOR CONTROL

Although traditional per-phase equivalent circuit has been widely used in steady-state analysis and design of induction motors, it is not appropriate to predict dynamic performance of the motor. In order to understand and analyze vector control of induction motors, the dynamic model is necessary. Unfortunately, the dynamic model equations are complex and there are many different forms of the model depending on the choice of reference frame. It is the objective to explain various forms in a concise way to understand clearly. In addition, the fundamental dynamic mechanism of the motor in the synchronous frame is developed and the basic principles of vector control is discussed in general terms.