Electric machine having an improved cooling rotor shaft
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United States of America Patent
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Jun 22, 2021
Grant Date -
Oct 10, 2019
app pub date -
Apr 6, 2017
filing date -
May 20, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to an electric machine comprising a stator and a rotor. The rotor is rotatably mounted within the stator and has a rotor shaft which is in the form of a hollow shaft and by means of which a cavity is formed that is provided for receiving a coolant. The rotor shaft has at least two shoulders, and at least one end section, wherein at least three rotor shaft sections with different diameters are formed. A flow element is arranged in the cavity of the rotor shaft in the region of the second rotor shaft section, and at least one radial outlet opening is formed in the casing of the rotor shaft in the region of the second rotor shaft section, said outlet opening fluidically connecting the cavity of the rotor shaft to an outer region of the rotor shaft.
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