Patent ID: 9660502
Date: 2017-05-23
CPC Classifications: H02K

Claim:
1. A motor comprising: a shaft to which a rotor is attached and having an internal cooling medium passage in an inside of the shaft, a cooling medium passing through the internal cooling medium passage; a housing including the shaft disposed therein and configured to rotatably support the shaft; a cooling medium reservoir provided in the housing and provided on a rest system of an upstream side of an inlet of the internal cooling medium passage in a flowing direction of the cooling medium, the cooling medium reservoir being configured to store the cooling medium and then flow the cooling medium to the internal cooling medium passage, wherein the cooling medium reservoir is provided on a rotational center axis of the shaft, and the rotational center axis is in parallel with a gravitational direction, and the cooling medium reservoir is provided with a restriction section which has an internal diameter which gradually reduces in diameter along a length to a minimum diameter followed by increasing in diameter before connecting to the internal cooling medium passage.