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Vol. 80, Issue 6, June 2007, pp. 1264-1276




A PWM Current Amplifier with PI Closed Loop Control for Magentorheological Fluid Applications


Qiang Liu*, Nabil Gindy, Chunhua Li **

School of Mechanical, Materials and Manufacturing Engineering

** School of Electrical and Electronic Engineering

University of Nottingham, Nottingham NG7 2RD, UK

Tel: +44 115 9514051; fax: +44 115 9513800; e-mail: epxql@hotmail.com



Received: 6 June 2007   /Accepted: 19 June 2007   /Published: 25 June 2007


Abstract: A magnetic field can rapidly change mechanical characteristics of magnetorheological (MR) fluids by means of controlling the current of an electromagnet, which is around MR fluids. Amplifiers of current-control-mode have better performance than that of voltage-control-mode. This paper investigates a low-cost current controllable amplifier based on a PWM IC chip, which can be used for MR fluid applications. The paper introduces the structure of the closed-loop current controllable amplifier based on PWM DRV103 and derives the mathematic models of the system. Based on these models the performance of the system is simulated and parameters of the system can be optimized. Experimental results demonstrate a good match between the models and underlying systems.


Keywords: PWM, Current-control-mode, MR fluids


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