Electrical machine e.g. direct current motor used in e.g. screwdriver, has cooling channel that is inserted in rotor shaft of machine, in communication on side facing fan wheel having first flow path
摘要
<p>The electrical machine (1) has fan wheel (2) mounted on the rotor shaft (4) of the electric machine. A cooling channel (7) is inserted in the rotor shaft of machine, in communication on the side facing the fan wheel having first flow path (12). The channel is extended axially through rotor.</p>
