A simple approach to electromagnetic actuator control based on asymptotically exact linearization

Abstract

This paper deals with system identification and robust control of a nonlinear electromagnetic actuator and proposes a simple, robust, and easy-to-implement compensation law for linearization, known as asymptotically exact linearization. There are many practical applications where this type of electromagnetic actuator is used: electromagnetic valve actuators of combustion engines, artificial heart actuators, electromagnetic brakes, etc. The investigated system is open-loop unstable and nonlinear and has a restricted equilibrium region. System identification experiments are presented with an emphasis on the design procedure of an Open image in new window controller. The experimental results demonstrate that the controller design problem can be successfully handled within the framework of robust control. This paper reflects a rather pragmatic control approach and, although it does not introduce novel control strategies, might be valuable reading for practicing engineers.