Liquid-cooled electrical machine

摘要

The invention relates to a liquid-cooled electrical machine which is constructed as an electric motor and is used as an alternative drive - in addition to an internal combustion engine drive - for a bus. In order to be able to cool such an electric motor with a high power concentration and a small structural volume without any problems, a water jacket is placed around the stator. In addition, the rotor is provided with a cooling circuit which is integrated in the rotor and is either constructed as a heat tube and emits its heat directly to the cooling circuit or can be acted on directly by cooling water. A centrifugal pump (rotary pump) is integrated in the rotor, which pump utilises the density difference between the cold cooling medium and the hot cooling medium in order to maintain circulation. The same water can be used as the cooling medium as that which is also used for cooling the internal combustion engine which is likewise installed on the bus.