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At a time when there were no power grids in all towns and villages, the small businesses based there had to generate the electricity they needed themselves. For this purpose, various heavy machines and three-phase generators were produced by well-known German companies. They mainly generated three-phase alternating current to enable the various operational applications. Three-phase alternating current offers a simple way of generating a uniform rotating field. This rotating field is used in three-phase machines for drives (motor operation) or to generate electrical energy (generator operation). If three coils in a three-phase generator are arranged in a circle offset by 120° each, a rotating field rotating centrally creates three alternating voltages that are also offset in time. This phase position of the alternating voltages enables a three-phase motor connected to the grid to start up independently! In order to be able to show you this, I visited Ludwig Pott. Ludwig runs a wonderful private machine museum. Here we can at least put the machines and generators into operation! Attention correction: The Braun generator is most likely a direct current generator! We have only just become aware of this information….