Title: A stepper motor-driven semi-active variable damper - Part 1: stepper motor positioning control and performance

Authors: X. Carrera Akutain, J.M. Carballo, J. Savall, J. Vinolas

Addresses: TECNUN (University of Navarra), Manuel de Lardizabal 13, 20018 Donostia-San Sebastian, Spain. ' TECNUN (University of Navarra), Manuel de Lardizabal 13, 20018 Donostia-San Sebastian, Spain. ' CEIT and TECNUN (University of Navarra), Manuel de Lardizabal 15, 20018 Donostia-San Sebastian, Spain. ' CEIT and TECNUN (University of Navarra), Manuel de Lardizabal 15, 20018 Donostia-San Sebastian, Spain

Abstract: Controllable dampers cannot track the force command of an idealised model. Literature proves the importance of considering practical constraints in the development of semi-active suspensions. Limitations concerning the non-linear behaviour of the dampers, as well as the phase lag in the damping force response due to the actuator transients, are of particular importance. This paper tries to develop a comprehensive description of a semi-active system with stepper motors, putting emphasis on two features. On one hand, the implementation of an open-loop positioning control for the stepper motors that reduces position uncertainty. On the other hand, the development of advanced bandwidth and time-response tests in order to understand the dynamic performance of the system. The obtained results show a reliable position tracking of the motors and can be very valuable for its implementation on semi-active suspension systems, utilising stepper motors, independently of the selected control strategy.

Keywords: advanced bandwidth; semi-active controllable dampers; stepper motor positioning; positioning control; semi-active suspensions; vehicle suspension; stepper motors; position uncertainty; time-response tests; position tracking.

DOI: 10.1504/IJVAS.2005.008231

International Journal of Vehicle Autonomous Systems, 2005 Vol.3 No.2/3/4, pp.152 - 175

Available online: 25 Nov 2005 *

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