inner wall of the drum detecting motor current during the wrapping of the laundry determining an unbalanced state of the laundry based on the detected motor current and controlling speed of the drum based on a result of the determination application_number US 7865308 A description reference will now be made in detail to the embodiments examples of which are illustrated in the accompanying drawings wherein like reference numerals refer to like elements throughout the embodiments are described below to explain the present invention by referring to the figures fig4 is a control block diagram of a washing machine according to embodiments referring to fig4 the washing machine includes an input unit 20 to allow a user to input an operation command including setting of a spin drying operation a control unit 22 to control the overall operation of the washing machine such as washing rinsing and spin drying a motor driving unit 24 to drive a motor 26 that rotates a drum 10 according to the control of the control unit 22 a speed detecting unit 28 to transmit a motor speed signal corresponding to the rotation speed of the drum 10 to the control unit 22 a current detecting unit 30 to transmit a motor current signal corresponding to the rotation speed of the drum 10 to the control unit 22 and a back electromotive force detecting unit 32 to transmit a back electromotive force proportional to the rotation speed of the drum 10 to the control unit 22 the control unit 22 performs an unbalance reduction control procedure to maintain the balanced state of laundry 12 when a spin drying operation is initiated as in the conventional art as shown in fig5 the unbalance reduction control procedure according to.