Slim-type motor having a heat-dissipating structure, and washing machine adopting a direct drive system

1. A slim type motor having a heat radiating structure for a washing machine having a direct drive system, the slim type motor comprising:

a stator in which stator cores around which coils are wound are disposed in an annular form in an annular stator support, wherein the annular stator support includes an outer circumferential edge portion and an inner circumferential edge portion defining a circular opening in the annular stator support in order to emit heat generated in the inside of the motor to the outside, the circular opening of the annular stator support being completely open;

a rotor in which a plurality of permanent magnets are arranged in a back yoke mounted on a circular rotor support, to thus form an air gap with respect to the stator;

a rotating shaft that is coupled to the central portion of the rotor support and is driven by a torque of the rotor; and

a plurality of bolting-couplers that are respectively extended from the outer circumferential edge portion of the annular stator support and include bolt-coupling holes through which bolts are fitted to couple the annular stator support directly to a tub of the washing machine,

wherein the stator cores are supported by the annular stator support and held in place at the annular stator support in such a way that the rotor can be operatively accommodated inside a space provided by the annular stator support and the tub of the washing machine.

2. The slim type motor according to claim 1 , wherein the rotor support comprises a plurality of ribs that are arranged in a radial form from the center of rotation, and a plurality of vent holes that are placed in spaces respectively formed between the ribs.

3. The slim type motor according to claim 2 , wherein at least one of the ribs are protrudingly formed with a thickness that corresponds to height of the stacked stator cores through the circular opening of the annular stator support.

4. The slim type motor according to claim 1 , wherein at least two bearings are mounted on the tub in order to rotatably support the rotating shaft.

5. The slim type motor according to claim 1 , wherein one end of the rotating shaft is coupled to a drum located in the inside of the tub, the other end thereof is coupled with a fastening nut, and the fastening nut is set in position so as not to exceed an outer surface of the annular stator support.

6. The slim type motor according to claim 1 , wherein the rotor is implemented in a double rotor structure, which comprises an inner rotor and an outer rotor, and wherein the inner rotor and the outer rotor are interconnected with the rotor support, at one end of each of the inner rotor and the outer rotor.

7. The slim type motor according to claim 1 , wherein the slim type motor is mounted in a drum type washing machine whose rotating shaft is formed in the horizontal direction, or a full-automatic washing machine whose rotating shaft is formed in the vertical direction.

8. A direct drive washing machine having a direct drive system, the direct drive washing machine comprising:

a tub;

a stator in which stator cores around which coils are wound are disposed in an annular form in an annular stator support, wherein the annular stator support includes an outer circumferential edge portion and an inner circumferential edge portion defining a circular opening in the annular stator support in order to emit heat generated in the inside of the motor to the outside, the circular opening of the annular stator support being completely open;

a rotor in which a plurality of permanent magnets are arranged in a back yoke mounted on a circular rotor support, to thus form an air gap with respect to the stator; and

a rotating shaft whose front end is coupled to the tub and whose rear end is coupled to the central portion of the rotor support and that is driven by a torque of the rotor; and

at least one pair of bearings that are mounted in the tub in order to rotatably support the rotating shaft,

wherein a plurality of bolting-couplers respectively extended from the outer circumferential edge portion of the annular stator support and include bolt-coupling holes through which bolts are fitted to couple the annular stator support directly to the tub of the washing machine,

wherein the stator cores are supported by the annular stator support and held in place at the annular stator support in such a way that the rotor can be operatively accommodated inside a space provided by the annular stator support and the tub of the washing machine.

9. The direct drive washing machine according to claim 8 , wherein the rotor support comprises a plurality of ribs that are arranged in a radial form from the center of rotation, and a plurality of vent holes that are placed in spaces respectively formed between the ribs.

10. The direct drive washing machine according to claim 8 , wherein one end of the rotating shaft is coupled to a drum located in the inside of the tub, the other end thereof is coupled with a fastening nut, and the fastening nut is set in position so as not to exceed an outer surface of the annular stator support.

11. The direct drive washing machine according to claim 10 , wherein the central portion of the rotor support is positioned at the center of gravity of the rotor.

12. The direct drive washing machine according to claim 8 , wherein the rotor is formed of a double rotor and the stator is formed of a plurality of split cores.

13. The direct drive washing machine according to claim 12 , wherein the circular opening of the annular stator support is opened to expose an inner rotor of the double rotor.