Abstract: An improved method for detecting a laundry weight in a washing machine employing a sensorless BLDC motor is provided. The motor is rotated until the washer reaches a first speed. The washer then operates in a torque control mode for a predetermined amount of time, and a laundry weight is then determined based on a speed of the motor after the predetermined amount of time has elapsed. In this manner, laundry weight can be accurately determined and the laundry can be effectively washed. Additionally, since a washing machine employing this improved method for detecting does not require a hall sensor and its peripheral circuit manufacture is simplified, and thus cost may be reduced.

Abstract: A skeleton type brushless motor comprises: a rotor in which a rotational shaft is pressed and fixed; a stator including a first stator core and a second stator core in which rotor receiving parts for receiving the rotor are formed, a coil winding unit coupled to the stator cores, and a coil wound on the coil winding unit; and the first and second stator cores are separated and faces each other centering around the rotational shaft of the rotor, whereby a leakage flux is reduced and maneuverability and efficiency are increased.

Abstract: Disclosed is an apparatus controlling an operation of a motor and control method thereof enabling to prevent a driving force of the motor from being reduced and actuate the motor for hours stably when a washing machine is operated for hours. The present invention includes the steps of detecting a phase voltage value and a phase current value applied to the motor between forward and backward revolution sections of the motor, calculating a phase resistance value based on the detected phase voltage and current values, and controlling the operation of the motor by controlling a voltage applied to the motor in accordance with the calculated phase resistance value.

Abstract: A single phase line start permanent magnet synchronous motor is started by an interaction between magnetic fields of the coil and of the secondary conductor, and an normal operation can be performed using only the permanent magnet and the operating condenser of small capacity, only the main coil, or only the operating condenser when the synchronous rotating speed is reached and the rotation is started, and therefore an additional direct current supplying device for supplying the direct current and the position sensor for sensing the rotational position of the rotor can be excluded, the structure can be made compactly by constructing the driving circuit simply, and manufacturing cost can be reduced.

Abstract: A method for detecting a laundry weight in a washing machine employing a sensorless BLDC motor includes the steps of: determining whether a first predetermined time elapses after a motor is initiated and reaches a certain speed; and controlling the motor in a torque control mode when the first predetermined time elapses and detecting a laundry weight on the basis of the motor speed after a second predetermined time elapses. A laundry weight can be accurately measured and the laundry can be effectively washed even in an environment that a voltage is not regularly applied. In addition, since the laundry weight detecting apparatus of a washing machine employing the sensorless BLDC motor does not include a hall sensor and its peripheral circuit, its construction is simple and thus its price can be reduced.

Abstract: Disclosed is an apparatus controlling an operation of a motor and control method thereof enabling to prevent a driving force of the motor from being reduced and actuate the motor for hours stably when a washing machine is operated for hours. The present invention includes the steps of detecting a phase voltage value and a phase current value applied to the motor between forward and backward revolution sections of the motor, calculating a phase resistance value based on the detected phase voltage and current values, and controlling the operation of the motor by controlling a voltage applied to the motor in accordance with the calculated phase resistance value.

Abstract: A single phase line start permanent magnet synchronous motor is started by an interaction between magnetic fields of the coil and of the secondary conductor, and an normal operation can be performed using only the permanent magnet and the operating condenser of small capacity, only the main coil, or only the operating condenser when the synchronous rotating speed is reached and the rotation is started, and therefore an additional direct current supplying device for supplying the direct current and the position sensor for sensing the rotational position of the rotor can be excluded, the structure can be made compactly by constructing the driving circuit simply, and manufacturing cost can be reduced.

Abstract: A skeleton type brushless motor comprises: a rotor in which a rotational shaft is pressed and fixed; a stator including a first stator core and a second stator core in which rotor receiving parts for receiving the rotor are formed, a coil winding unit coupled to the stator cores, and a coil wound on the coil winding unit; and the first and second stator cores are separated and faces each other centering around the rotational shaft of the rotor, whereby a leakage flux is reduced and maneuverability and efficiency are increased.