Washing machine and method for controlling the same

Abstract

Method for controlling a washing machine having a drum of which rotation speed is adjustable, including a first step for rotating the drum at a first rotation speed set at control unit, a second step for detecting whether resonance occurs or not at the drum rotating at the first rotation speed, and a third step for changing the rotation speed of the drum if the resonance is detected at the drum.

1 - 18 . (canceled) 
   
   
       19 . A method for controlling a washing machine having a drum of which rotation speed is adjustable for extracting water from laundry, comprising: a first step for rotating the drum at a second rotation speed set at a control unit; a second step for increasing the rotation speed from the second rotation speed by predetermined magnitudes of rpm in succession, and whether resonance occurs or not at every rotation speed section is detected; a third step for changing the rotation speed of the drum when resonance of the drum is detected; and a fourth step for storing the changed rotation speed in the control unit. 
   
   
       20 . The method as claimed in  claim 19 , wherein the first step includes the steps of; selecting one of course relevant to a kind of laundry, and rotating the drum at the second rotation speed for the selected course. 
   
   
       21 . The method as claimed in  claim 19 , wherein the rotation speed of the drum increases in the third step. 
   
   
       22 . The method as claimed in  claim 19 , wherein the rotation speed of the drum decreases in the third step. 
   
   
       23 . The method as claimed in  claim 19 , wherein the rotation speed of the drum changes by predetermined magnitudes each greater than 50 rpm in the third step. 
   
   
       24 . The method as claimed in  claim 19 , wherein the steps are performed in a state a test mode is selected. 
   
   
       25 . The method as claimed in  claim 24 , wherein the drum is rotated at the changed rotation speed when the washing machine is put into operation again after the test mode is finished. 
   
   
       26 . The method as claimed in  claim 25 , wherein, not the changed rotation speed, but the second rotation speed is displayed on a display, when the washing machine is put into operation again after the washing machine is stopped. 
   
   
       27 . The method as claimed in  claim 19 , wherein the fourth step includes the step of sounding an alarm from a speaker when the changed rotation speed is stored. 
   
   
       28 . The method as claimed in  claim 19 , wherein the third step is performed automatically by the control unit having the signal received from a resonance detecting device. 
   
   
       29 . The method as claimed in  claim 19 , wherein the second step includes the step of automatic detection of resonance occurrence at the drum by the resonance detecting device. 
   
   
       30 . The method as claimed in  claim 19 , wherein the second step further includes the step of storing a preset maximum rotation speed in the control unit in a case no resonance occurs until the drum rotates up to the preset maximum speed. 
   
   
       31 . The method as claimed in  claim 19 , wherein the second step further includes the step of sounding an alarm from a speaker if the resonance of the drum is detected. 
   
   
       32 - 38 . (canceled)