Patent ID: 7802454

Claim:
A washing machine comprising: an outer tub in a cabinet for holding washing water; an inner tub rotatably mounted on an inside of the outer tub having an agitating device rotatably mounted therein; a power transmission device having a washing shaft connected to the agitating device and a spinning shaft connected to the inner tub; a driving motor on an outside of the outer tub having a rotor assembly with a magnetism, and a hollow stator assembly arranged in the rotor assembly, wherein the rotor assembly includes a rotor frame having the washing shaft connected to a lower central part directly and a plurality of permanent magnets attached to an inside circumferential surface of the rotor frame; a clutch assembly for selective transmission of a driving power from the driving motor to the spinning shaft depending on operation modes; and a drain device for draining the washing water to an outside of the washing machine, wherein the rotor frame includes at least one first cooling blade formed at a part of a bottom surface of the rotor frame and a plurality of second cooling blades formed at a part of an outside circumferential surface of the rotor frame, wherein some of the plurality of second cooling blades are incised and bent in a rotation direction of the rotor frame, and the rest of the plurality of second cooling blades are incised and bent in an opposite direction of rotation of the rotor frame.