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Technical Examples
An actuator which, by a movement of a component which is generated by means of an electric current, can effect control of another component in a mechanical environment having rotating parts which are housed in a very small space. A rotating element, for example a clutch shaft (1; 21), is hollow, and an electromagnetic coil arrangement (7; 24) is housed in this cavity in such a way that the excitation of the coil is converted into a mechanical displacement of a component arranged outside the clutch shaft, for example of a sleeve sliding axially on the clutch shaft. For this purpose, parts of the clutch shaft are made ferromagnetic and are integrated in the magnetic loop of the coil (7; 24). The actuator according to the invention can be used, for example, in a viscous clutch for controlling the throughput of shear medium.