Patent ID: 8492941

Claim:
A rotating electric machine comprising: a rotor; a shaft extending along an axis of rotation of said rotor and rotating with said rotor; and a first plate and a second plate provided at opposite ends, respectively, of said rotor, as seen in a direction of the axis of rotation of said rotor, said shaft having a first coolant channel and a second coolant channel provided independently of each other, extending in the direction of the axis of rotation of said rotor, and passing a coolant therethrough, said first plate and said second plate having a third coolant channel and a fourth coolant channel communicating with said first coolant channel and said second coolant channel, respectively, and guiding the coolant to said rotor, said first coolant channel and said third coolant channel being formed so as to avoid passing the coolant in a stream having vector components facing one another, as seen in the direction of the axis of rotation of said rotor, on a route of said first coolant channel and said third coolant channel, said second coolant channel and said fourth coolant channel being formed so as to avoid passing the coolant in a stream having vector components facing one another, as seen in the direction of the axis of rotation of said rotor, on a route of said second coolant channel and said fourth coolant channel, said shaft being cylindrical, said first coolant channel including a first groove formed at an inner circumferential surface of said shaft and extending in the direction of the axis of rotation of said rotor, said second coolant channel including a second groove formed at an inner circumferential surface of said shaft, extending in the direction of the axis of rotation of said rotor, and provided about an axis of rotation of said shaft out of phase with said first groove.