Dynamic control of induction motor motion via stator voltage variations

An algorithm for speed-trajectory control of three-phase squirrel-cage induction motors by means of stator voltage control is presented. The dynamic behavior of the induction motor is described by a set of first-order nonlinear differential equations. The stator voltage and the electromagnetic torque are related by a recursion formula. A nonlinear method for controlling the induction motor so that it follows an interpolated speed-trajectory is discussed. To achieve an acceptable control performance, the control law is utilized, together with the recurrence relation, to compute a nonlinear feedback controller. The method consists of first parameterizing the path in the configuration space and then, given a path, using control theory to determine a trajectory subject to torque constraints