Voith-Marguerre coupling

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The Voith-Marguerre coupling enables traction current generators to be connected to alternating current generators .

The usual frequency of alternating current from power plants is 50 Hertz. The turbines that drive the so-called three-phase generators for 50 Hz run at 3000 / min (large turbo sets, for example in nuclear power plants, also run at 1500 / min). The trains of the railway, however, run on single-phase alternating current of 16.7 Hertz. These generators only rotate at 1000 rpm. In order to be able to operate three-phase generators as well as traction current generators with one turbine and to be able to distribute the power between the two generators as required, Fritz Marguerre inventedthe Voith-Marguerre coupling. It is a hydraulic clutch. It is connected downstream of the 50 Hz 3-phase generator, which is rigidly connected to the turbine rotating at 3000 rpm. Then the speed is reduced to 1000 rpm of the traction current generator in a transmission. Depending on the filling level of the hydraulic clutch, a corresponding power can be transferred to the traction current generator in a targeted manner. It was first applied to both machine 11 and machine 12 in the Mannheim power station . The total output of the turbine and the three-phase generator in both machines is approx. 44 MW, that of the traction current generator is approx. 12.5 MW. The couplings and gears were torn down together with the traction current generators at the beginning of the 1990s to make room for a new district heating turbo group. Parts of this coupling can be viewed today at the Voith headquarters. The turbines and the associated 3-phase generators of the M11 and M12 are still operational today (as of 2014) and are still used occasionally in winter.

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