A clothes treating apparatus is provided. The clothes treating apparatus may include a drum having a locking tab formed by cutting a portion of an outer circumferential surface to be bendable inward towards an interior of the drum, and a balancer having a fastener that protrudes from the outer circumferential surface to hold the locking tab. The locking tab may be configured to be pushed inward towards the interior of the drum in order to be locked in the fastener and to restrict movement of the balancer in a forward or backward direction of the drum as the drum rotates.

Disclosed is a method for controlling a spin-drying cycle of a laundry treatment machine. The method includes performing a plurality of spin-drying operations by rotating a drum above an adjusted rotational speed range configured to adjust disposition of balls within a ball balancer so as to correspond to a changed amount of eccentricity, and adjusting the disposition of the balls within the ball balancer by rotating the drum within the adjusted rotational speed range, between the respective spin-drying operations.

Disclosed is a method for reducing vibration during dehydration of a washing machine having a ball balancer provided to a spin basket for accommodating clothes. The disclosed method for reducing vibration comprises: a test rotation step for rotating the spin basket at a measurement rotation count, which is lower than a resonance rotation count and at which the balls of the ball balancer move in a circle; a vibration period measurement step for measuring a vibration period of the spin basket, the vibration period being caused by the eccentric distribution of the clothes in the test rotation step; and an acceleration start timing acquisition step for acquiring acceleration start timing on the basis of the vibration period such that the balls and the eccentrically distributed clothes are arranged to face each other in opposite phases during resonance, when the rotation count of the spin basket passes the resonance rotation count if there is acceleration at a preset determined acceleration speed from the measurement rotation count.

The present disclosure relates to a washing machine, having an actively movable balancer, and method of controlling the same. The washing machine according to an embodiment of the present disclosure includes: a balancing unit to move along a circumference of a drum to reduce imbalance due to an unbalanced distribution of the laundry; a transmission coil provided at a tub to generate a wireless power signal and transmit power wirelessly to the balancing unit; a transmission converter to apply power at a driving frequency to the transmission coil; a voltage measurer to measure a transmission voltage, which is a voltage of the transmission coil; and a transmission controller to control the transmission converter based on the transmission voltage measured by the voltage measurer, thereby transmitting sufficient power wirelessly to the balancing unit in a short period of time.

The present invention refers to a balancing apparatus 100 for preventing vibrations and loud running in a drum 1 of a washing machine while operating. The balancing apparatus 100 according to the present invention preferably comprises of at least two half rings 2 and a plurality of propellers 3. The plurality of propellers are attached to the drum 1. The two half rings 2 are configured to cover the drum 1. The propellers 3 and the half rings 2 are magnetically polarized while electric current is passing through the propellers 3 and half rings 2. The drum 1 is balanced by forming similar polarity in poles of the half rings 2 and the poles of the propellers 3 facing each other.

The present invention relates to a washing machine, having an actively movable balancer, and method of controlling the same. The washing machine according to an embodiment of the present invention includes: a tub; a drum; a balancing unit moving along a circumference of the drum; and a transmission coil provided at the tub, and to generate a magnetic field and transmit power wirelessly to the balancing unit, wherein the balancing unit comprises: a reception coil to generate electric power from the magnetic field formed by the transmission coil; and a position sensing unit to sense the magnetic field formed by the transmission coil and to generate a position signal when the balancing unit passes through the transmission coil.

A laundry treatment device according to an embodiment of the present invention includes: a cabinet; a drum accommodated in the cabinet; a tub configured to accommodate the drum; and a dynamic absorber provided to absorb oscillation of the cabinet, wherein the dynamic absorber includes: a support plate coupled to the cabinet; and a moving mass placed movably on the support plate to absorb oscillation transferred to the cabinet, and a partition wall configured to partition a top surface of the support plate, on which the moving mass is placed, into a first accommodation part and a second accommodation part protrudes from the top surface of the support plate.

A washing machine appliance and related methods are provided. The washing machine appliance has a wash tub, a wash basket rotatably mounted within the wash tub, and a balancing system comprising a plurality of fluid chambers defined in the wash basket. The method includes rotating the wash basket within the wash tub at a basket speed. The method also includes receiving, with the balancing system, a first signal from a measurement device and receiving, with the balancing system, a second signal from a controller of the washing machine appliance. The method further includes opening a valve to provide fluid to at least one of the plurality of fluid chambers of the balancing system based on the first signal and the second signal.

A control method of a laundry treating apparatus includes rotating a drum at a reference rotational speed that is lower or higher than a resonance rotational speed of the laundry treating apparatus; measuring the maximum displacements of tub front and rear surfaces and a phase difference between the maximum displacements during the rotation of the drum at the reference rotational speed; determining a front unbalance (UB) mass located in a drum front area, a rear UB mass located in a drum rear area, and an angle between the UB masses based on the maximum displacements and the phase difference; and accelerating a drum rotational speed to a target rotational speed that is higher than the reference rotational speed and the resonance rotational speed, when the front and rear UB masses are in a preset allowable mass range and an angle between the UB masses is in an allowable angle range.

A liquid damper system for restraining vibrations generated in a rotating body includes: a liquid damper which is coaxially rotatable with the rotating body and includes a collision member, the collision member being provided in a casing in which liquid is enclosed and the liquid colliding with the collision member when moving in the circumferential direction; and a relative rotation unit configured to cause the liquid damper to rotate relative to the rotating body. Vibrations of a rotating body are effectively suppressed when a rotating body steadily rotates at a main resonance frequency, in the liquid damper system.