Drive unit of a laundry machine and laundry machine having the same, and a controlling method of the laundry machine

A drive unit of a laundry machine that comprises a tub and a drum mounted in the tub, the drive unit connected to a drum shaft that penetrates the tub and that is configured to drive a rotation of the drum, the drive unit comprising:

• a stator provided at an outer surface of a lower wall of the tub;
• and
• a rotor coupled to the drum shaft and configured to rotate the drum shaft by rotating relative to the stator,
• wherein the rotor comprises a rotor frame, a magnet, and a connector that connects the rotor frame to the drum shaft, the rotor frame comprising:
• a side frame portion configured to mount the magnet of the rotor,
• a bottom frame portion extending horizontally from a lower end of the side frame portion, the bottom frame portion comprising a plurality of air inlet parts projecting upward from a bottom surface of the bottom frame portion toward the stator, each air inlet part comprising:
• a first wall extending along a circumferential direction of the rotor frame at a first radial distance from a radial center of the bottom frame portion;
• and
• a second wall extending from an upper end of the first wall toward the radial center of the bottom frame portion,
• wherein the first wall, the second wall, and the bottom surface of the bottom frame portion define an opening of the air inlet part that is configured to, in a state in which the rotor frame rotates, suck external air into an interior of the rotor frame through the bottom frame portion.