Dynamics of an electromagnetic linear actuator operating in error actuated control system

• Published in: Compel Vol. 26; no. 4; pp. 941 - 951
• Main Authors: Nowak, Lech, Radziuk, Kazimierz
• Format: Journal Article
• Language: English
• Published: Bradford Emerald Group Publishing Limited 14.08.2007
• Subjects: Actuators; Algorithms; Automation; Closed loop systems; Control systems; Controllers; Dynamics; Electromagnetic fields; Electromagnetism; Finite element analysis; Mathematical analysis; Mathematical models; PID controllers; Pneumatics; Sensors; Simulation; Studies; Time; Variables; Actuators; PID controllers; Electromagnetism; Electromagnetic fields; Dynamics
• ISSN: 0332-1649; 2054-5606
• DOI: 10.1108/03321640710756285

Purpose - The paper seeks to present an algorithm for a dynamical field-circuit coupled simulation of an electromagnetic linear actuator operating in automated control systems.Design methodology approach - The mathematical model includes: a transient electromagnetic field formulation for a non-linear conducting and moving medium, equations which describe the electric circuits of the converter and the supply system, the equation of mechanical motion, the equation describing closed-loop control and models for the sensor and the PID controller. The numerical implementation is based on the finite element method and the step-by-step algorithm for time discretization. In order to account for the nonlinearity of the ferromagnetic core the Newton-Raphson procedure has been applied. The influence of the PID controller settings on the operation of the controlled actuator is shown. Dynamic disturbances, e.g. step change of the set value of mover position or change of loading force, have been analyzed.Findings - The elaborated algorithm and the computer code can be an effective tool for field-circuit simulation of the dynamics of an electromagnetic linear actuator operating in an automatic control system. Only tapered plunger should be used as multi-stable actuators.Originality value - The study provides information of value in electromagnetic research.