A rotor/stator assembly for a motor, including: a rotor shaft including an internal channel; a rotor core disposed adjacent to the rotor shaft; and end windings disposed adjacent to an end of the rotor shaft and an end of the rotor core; wherein the rotor shaft includes a passage passing through a wall of the rotor shaft adjacent to the end thereof, thereby forming a path by which a cooling fluid passes from the internal channel of the rotor shaft to the end of the rotor core and the end windings when the rotor shaft and rotor core are rotated/rotating.