Washing machine motor and washing machine comprising same

A washing machine motor driving apparatus comprising:

• an outer rotor;
• an inner rotor;
• a double stator disposed with an air gap between the inner rotor and the outer rotor, and driving the inner rotor and the outer rotor independently;
• a first cylindrical outer shaft connected to the outer rotor;
• a second cylindrical outer shaft connected to a washing tub;
• a first inner shaft rotatably disposed inside the first cylindrical shaft and connected to the inner rotor;
• a second inner shaft rotatably disposed inside the second cylindrical shaft and connected to a pulsator inside the washing tub;
• and
• a planetary gear set comprising:
• a ring gear fixedly coupled to the first cylindrical outer shaft and the second cylindrical outer shaft;
• a sun gear fixedly coupled to the first inner shaft;
• a plurality of planetary gears rotatably engaged with an outer surface of the sun gear and an inner surface of the ring gear;
• and a carrier coupled to the second inner shaft and rotatably supporting the planetary gears,
• wherein the planetary gear set is configured in such a way that, when a rotational force from the inner rotor is applied to the sun gear through the first inner shaft, a rotational speed of the inner rotor is decelerated through the planetary gears and is transmitted to the pulsator through the carrier and the second inner shaft;
• and, when a rotational force from the outer rotor is applied to the ring gear through the first cylindrical outer shaft, a rotational speed of the outer rotor is not decelerated and is transmitted to the washing tub through the ring gear and the second cylindrical outer shaft, thereby being able to rotate the pulsator and the washing tub in the decelerated speed and the non-decelerated speed, respectively, and in opposite directions to each other.