Robert Boschgmbh

Martin Paetzold

Julian Roesner

Klaus Herbold

Horst Braun

Robert Goldschmidt

The invention relates to an electric machine (), particularly a generator or a starter generator for a motor vehicle, comprising a converter () which is arranged on a cooling element () and composed of semiconductor switching elements () actuated synchronously with the phase frequency for rectifying a generator alternating voltage or supplying a motor from a DC voltage source (). According to the invention, the cooling element () has a base plate () and cooling fins (), wherein the ratio of the surface wetted by coolant to the volume of the cooling element () ranges from 0.5 to 1.5 [l/mm], preferably from 0.8 to 1.0 [l/mm].

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Tuebingen, Germany

Martin Paetzold