Motor including a rotor and a stator, and washing machine using the same

A motor including a stator and a rotor that is rotatably provided at an outer side in a radial direction of the stator, the rotor comprising:

• a base part;
• a side wall part that is integrally formed with the base part and vertically extended with respect to the base part;
• and
• a plurality of permanent magnets that are provided at an inner side of the side wall part according to a circumferential direction and has a curvature radius so that an inner circumferential surface and an outer circumferential surface has the smaller radial thickness as going from the center thereof to the circumferential direction,
• wherein the side wall part is straightly extended in a vertical direction and is connected to the base part, and
• wherein a height of the permanent magnet is formed to be larger than a stacked height of the stator facing the permanent magnet,
• wherein an inner circumferential surface and an outer circumferential surface of the permanent magnet is formed in a curved surface having a curvature radius so that the radial thickness becomes smaller as going from the center of the permanent magnet to the circumferential direction;
• wherein the inner circumferential surface and outer circumferential surface of the permanent magnet are formed in the same curvature radius so that the radial thickness becomes smaller as going from the center of the permanent magnet to the circumferential direction.

A washing machine comprising:

• a cabinet that forms an external appearance;
• a tub that is installed inside the cabinet;
• a drum that is rotatably installed inside the tub;
• a motor including a stator that is fixed to the tub and a rotor that is rotatably provided at a radial outer side of the stator;
• and
• a washing shaft that transfers a rotating force of the motor to the drum,
• wherein the rotor comprises:
• a base part;
• a side wall part that is integrally formed with the base part and vertically extended with respect to the base part;
• and
• a permanent magnet that is provided at an inner side of the side wall part,
• wherein the side wall part is straightly extended in a vertical direction and is connected to the base part,
• wherein a height of the permanent magnet is formed to be larger than a stacked height of the stator facing the permanent magnet, and
• wherein a spacing distance from an inner side surface of the base part to a lower end of the permanent magnet is formed to be larger than a radial thickness of the permanent magnet,
• wherein an inner circumferential surface and an outer circumferential surface of the permanent magnet is formed in a curved surface having a curvature radius so that the radial thickness becomes smaller as going from the center of the permanent magnet to the circumferential direction;
• wherein the inner circumferential surface and outer circumferential surface of the permanent magnet are formed in the same curvature radius so that the radial thickness becomes smaller as going from the center of the permanent magnet to the circumferential direction.