Abstract
This study proposes a novel method to change the stiffness of a mechanical link system according to the given magnetic field. We propose a variable stiffness link with magneto-rheological (MR) fluid, which can be controlled by the current of an electrical coil. Possible applications of this new device include sports training, physiotherapy and motor rehabilitation. Compared to a weight lifting system, which requires manual changing of weights, this new device allows the users to change the load easily and continuously with better power consumption. The advantages of the developed link are verified by several experiments to evaluate its basic characteristics as well as in an application to upper limb orthosis.
