Theory of power-electronic ac motor control for modeling, estimation and control and/or analysis

The theoretical considerations of nonlinear control for power electronic ac motors are given and the related problems of modeling, estimation, analysis are discussed. The control method so called 'field oriented control' or 'vector control' is revised and new control methods which linearize the characteristics of ac motors are proposed. The circuit theoretical consideration is also given to grasp the specific nonlinear structures of ac motors by introducing equivalent circuit models.