The invention relates to a clamping device, for example swing tensioners, bracing elements, machine vises or block cylinders, with a movable clamping element for clamping a workpiece with a defined clamping force, and with an electric motor for mechanically driving the clamping element, also with a control unit that controls the electric motor. A thin imaging layer is created with uniform silicon distribution in a bilayer format. The stator assembly is disposed around the rotor and is inductively coupled to the rotor. By controlling the flow of coolant to the heat exchanger, the lower set discharge temperature of the air exiting the circulation compressor can be regulated during steady-state operation to maintain the casing contracted for optimal clearance. This allows large portions of the worldwide population to be supplied with the update data.