Laundry treatment machine and method of operating the same

A method of operating a laundry treatment machine that processes laundry via rotation of a tub, the method comprising:

• performing a primary sensing of an amount of laundry within the tub;
• supplying water to a first water level within the tub;
• sensing the level of water within the tub;
• performing a secondary sensing of the amount of laundry within the tub;
• judging whether the laundry includes dry laundry or wet laundry using the primarily sensed amount of laundry, the secondarily sensed amount of laundry, and the sensed water level value,
• wherein each of the primary amount of laundry sensing and the secondary amount of laundry sensing includes:
• accelerating a rotational velocity of the tub during an accelerated rotating section;
• rotating the tub at a constant velocity during a constant velocity rotating section;
• and
• calculating the amount of laundry in the tub based on a difference between an average current command value to rotate the motor during the accelerated rotating section and an average current command value to rotate the motor during a calculating section of the constant velocity rotating section,
• wherein the constant velocity rotating section is divided into a stabilizing section to stabilize the tub and the calculating section to add up current command values for sensing of amount of laundry,
• wherein a length of the stabilizing section is changed based on the average current command value during the accelerated rotating section, and
• wherein the average current command value during the constant velocity rotating section is calculated based on the current command values during the calculating section.