CPC H02K 9/19 (2013.01) [H02K 5/12 (2013.01); H02K 5/163 (2013.01)] | 15 Claims |
1. A rotor assembly comprising:
a rotor core having a through-hole disposed at a central portion thereof along an axial direction of the rotor core; and
a rotor shaft configured to pass through the through-hole and coupled to the rotor core,
wherein the rotor shaft includes:
a shaft body having a hollow portion in an interior thereof;
a cooling fluid hole part including a plurality of cooling holes passing through the shaft body to discharge a cooling fluid introduced through the hollow portion to an outside of the shaft body, the plurality of cooling holes being arranged to be spaced apart from each other along an axial direction of the shaft body; and
a support flange protruding radially on an outer surface of the shaft body to restrain axial movement of the rotor core and having a passage communication hole, and
wherein the rotor core includes:
a rotor cooling passage extending in the axial direction of the rotor core, communicating with some of the plurality of cooling holes, configured to pass through the passage communication hole, and configured such that the cooling fluid flows therethrough,
wherein the support flange includes:
a support body having the passage communication hole; and
a plurality of passage parts, spaced apart from one another in a circumferential direction of the rotor shaft, each of the passage parts having a cut shape at a portion of the support body and extending radially from the shaft body to communicate with some of the plurality of cooling holes,
wherein the passage communication hole is disposed between adjacent ones of the passage parts in the circumferential direction of the rotor shaft.
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