ELECTRIC MACHINE
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United States of America Patent
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Issued Date -
Feb 27, 2014
app pub date -
Dec 20, 2011
filing date -
Jan 18, 2011
priority date (Note) -
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Abstract
An electric machine with a rotor (4) rotatably disposed within a stator (2) has a plurality of permanent magnets received in the rotor body of the rotor. Rotor body plates are stacked so as to form at least two first channels (31) extending inside the rotor body from one axial end of the rotor to an opposite axial end thereof and having an opening (33) to the exterior of the rotor body in an end surface of the latter at at least one of these axial ends, and at least one separate second channel (32) associated with each first channel and connecting the respective first channel to a space circumferentially surrounding the rotor and separating the rotor and the stator by opening at the periphery of the rotor body so as to upon rotation of the rotor throw air out from said second channel to said space for cooling the rotor body.
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