Discussion on:'A Saturated PI Velocity Controller for Voltage-Fed Induction Motors'

摘要

Indirect Field-Oriented Control (IFOC) is a standard high-performance control method, widely adopted in commercial induction motors, that has been proposed well before the application of modern theory of nonlinear feedback control to electric machines, [1], [2]. The main idea of "Field-Orientation" is to use a suitable coordinate transformation (often referred to as Clarke-Park transformation) to obtain a decoupling between the magnetic flux and the mechanical dynamics, by thus obtaining a transformed model similar to the one describing separately-excited DC machines. The description of the system in the new coordinates makes natural to approach the control problem by means of cascade approaches for the speed and torque control, with inner and outer loops governing respectively the current and the speed dynamics.