Protective layers of the MCrAlX type according to the prior art are often provided with a platinum layer to prevent diffusion of elements out of the base material into the MCrAlX. A control device is provided which is coupled to the second amplifier device to derive an effective gain factor of the second amplifier device as a function of the control signal. An impeller is connected in a rotationally fixed manner to the rotor. The multi-core processor includes at least two cores, an on-chip memory, and a master processor in a single integrated circuit package.