Abstract
For a medical research project it has been required to design an ergometer which produces a defined force via a handle to the human hand. This force has to be dependent on the position, velocity and acceleration of the handle. This makes possible the representation of different char-acteristica such as the behavior of spring, mass and friction or a combination thereof. The drive of the handle is realized with a solenoid motor with a four-quadrant DC chopper. The force control is realized via current control of the chopper. The reference value is given from a microcontroller which also transmits the data (position and force of the handle - necessary for medical research) to a PC for further processing.
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