Abstract: Disclosed herein are an apparatus and method for driving a compressor, which are capable of being suitably used for driving a refrigeration system such as a refrigerator with high efficiency and low noise. The compressor driving apparatus including a motor and a compressor driven by the motor includes an inverter which supplies power to the motor to drive the motor; a rotator position detector which detects the position of a rotator of the motor; and an inverter drive controller which includes at least one wave generator for generating an optimal driving wave according to an operation mode and a control mode of the motor, stores the generated optimal driving wave, and drives the inverter with the generated wave.

Abstract: Disclosed herein are a device and method of driving a brushless DC (BLDC) motor. The device to drive the BLDC motor includes a rectifier which converts an AC voltage into a DC voltage; an inverter which converts the DC voltage into an AC voltage by switching a plurality of power switches and supplies the converted AC voltage to the BLDC motor; and a microcomputer which detects a position of a rotor before a terminal voltage of the BLDC motor exceeds 1/2 of an output voltage of the rectifier and performs phase switching, when a driving speed of the BLDC motor reaches a rated speed.

Abstract: Disclosed are an apparatus and a method of controlling a BLDC motor, including a controller to determine whether the PWM duty of the BLDC motor in driving is desirable, and performing compensation and control processes for the BLDC motor according to the determination result, through a phase voltage measuring scheme, when controlling the operation of the BLDC motor by adjusting voltage applied to three-phase coils of a stator of the BLDC motor.

Abstract: An apparatus and method for controlling a motor, which are capable of accurately controlling a speed of the motor regardless of whether an error occurs in a clock circuit of the apparatus. It is possible to accurately control a speed of the motor regardless of a time error of the clock circuit, which occurs due to a use condition or long-term use, by driving the motor according to an input speed signal, detecting a driving waveform of the driven motor, synchronizing the detected driving waveform with the speed signal, and controlling the speed of the motor.

Abstract: A motor system includes a BLDC (brushless direct current) motor; an inverter driving the BLDC motor; a current detector detecting a direct current of the inverter; an induced voltage detector detecting an induced voltage of the BLDC motor; and a controller controlling at least one of an output voltage and an output frequency of the inverter based on the direct current detected by the current detector and the induced voltage detected by the induced voltage detector.

Abstract: A BLDC motor phase commutation method is provided, which can correctly detect phase commutation timing and position detection timing of a BLDC motor in a compressor to stabilize rotation and RPM of the compressor, thereby minimizing noise and vibration. When the BLDC motor rotates through a mechanical angle corresponding to one period, the BLDC motor operates according to a first scheme in which operation of the BLDC motor in the first phase commutation section of a period is performed in the same manner as in the last phase commutation section of a period immediately prior to the period. After the BLDC motor switches to sensorless mode, the BLDC motor operates according to a third scheme in which the first phase commutation section of a period has a time interval equal to the average of time intervals of first phase commutation sections of periods prior to the period.

Abstract: A method of controlling the speed of a BLDC (brushless direct current) motor and a method of controlling the cooling speed of a refrigerator using the same. A method of controlling the speed of a BLDC motor includes: inputting a driving signal having a predetermined reference current applying angle to the motor to achieve a predetermined reference speed; measuring a rotating speed of the motor; increasing a current applying angle of the driving signal if the measured rotating speed does not reach the reference speed and the driving signal has reached a maximum input of the motor; and inputting the driving signal having the increased current applying angle to the BLDC motor.

Abstract: The invention provides a refrigerator having a compressor, the refrigerator including: a motor driving the compressor; a motor driver supplying power to the motor; and a controller outputting a control signal corresponding to a second command speed to the motor driver, and outputting a control signal corresponding to a first command speed which is higher than the second command speed to the motor driver when a driving on/off ratio of the motor driver is maintained below a given reference driving on/off ratio for a given reference period. Accordingly, it is an aspect of the present invention to provide a refrigerator to operate a compressor stably and easily under overload or low voltage conditions, and a method for controlling the same.

Abstract: A Brushless Direct Current (BLDC) motor starting method and device are provided. With the method and/or device, startup noise and vibration and startup failure rate can be reduced using a constant low-speed startup scheme when the BLDC motor is in startup mode. Additionally, Pulse Width Modulation (PWM) duty is also maintained at low level when the BLDC motor starts up, thereby preventing excessive current from occurring due to desynchronization of the motor at startup, so that it is possible to optimize specifications of an inverter in the BLDC motor. The BLDC motor starts up with a synchronous speed and a PWM duty of a rotor of the BLDC motor being kept constant, and the BLDC motor switches to sensorless mode if a position of the rotor is detected a predetermined number of times or more during a specific time period.

Abstract: A motor controller, including: a power supply which supplies DC power; an inverter which converts the DC power into AC power to be supplied to a motor; a shunt resistor which connects the power supply and the inverter; and a controller which supplies a control signal to the inverter to drive the motor and determines an error of the inverter when it is determined that a size of voltage between both ends of the shunt resistor is less than a predetermined first reference value. Thus, a motor controller is provided which detects an error of an inverter more easily and precisely, and a control method thereof and an error detecting apparatus of an inverter.

Abstract: A method of controlling a three-phase brushless direct current (BLDC) motor, including (a) arranging a rotor of the three-phase BLDC motor by making a current flow to two of the three phases; (b) rotating the rotor through a phase shift; (c) detecting a position detecting point of time where a sign of an inductive electromotive voltage generated by a rotation of the rotor in a non-exciting phase is initially changed; and (d) calculating a rotation speed of the rotor based on a size of the inductive electromotive voltage of the non-exciting phase detected at the position detecting point of time. Thus, provided is a brushless direct current (BLDC) motor controller and a control method thereof which precisely detects a position detecting point of time of a rotor to determine a rotation speed of a rotor and minimizes noise and vibration during an initial drive of the three-phase BLDC motor.

Abstract: A BLDC motor phase commutation method is provided, which can correctly detect phase commutation timing and position detection timing of a BLDC motor in a compressor to stabilize rotation and RPM of the compressor, thereby minimizing noise and vibration. When the BLDC motor rotates through a mechanical angle corresponding to one period, the BLDC motor operates according to a first scheme in which operation of the BLDC motor in the first phase commutation section of a period is performed in the same manner as in the last phase commutation section of a period immediately prior to the period. After the BLDC motor switches to sensorless mode, the BLDC motor operates according to a third scheme in which the first phase commutation section of a period has a time interval equal to the average of time intervals of first phase commutation sections of periods prior to the period.