A stepper motor-driven semi-active variable damper - Part 1: stepper motor positioning control and performance
by X. Carrera Akutain, J.M. Carballo, J. Savall, J. Vinolas
International Journal of Vehicle Autonomous Systems (IJVAS), Vol. 3, No. 2/3/4, 2005

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.

Online publication date: Fri, 25-Nov-2005

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