APPARATUS FOR DRIVING BRUSHLESS DC MOTOR, COMPRESSOR OF REFRIGERATOR, AND METHOD OF DRIVING BRUSHLESS DC MOTOR

摘要

PPROBLEM TO BE SOLVED: To prevent a motor behavior from being changed when a waveform output means at a low speed time of a brushless DC motor is switched to a waveform output means at a high speed time or vice versa. PSOLUTION: A method of driving a brushless DC motor can suppress the change of the motor behavior when a waveform generating means to output a rectangular wave having a conducting angle of 120 to less than 180 or a waveform following to the rectangular wave, and a waveform generating means to output a rectangular wave/sine wave or a waveform following to the rectangular wave/sine wave having a conducting angle of 120 to less than 180 in a predetermined frequency and changing only a predetermined frequency with a constant duty are switched by an operating state. An influence affecting the non-cooling/dull cooling of a refrigerator and the lifetime reliability of a motor can be removed by suppressing noise generation/step-out or further reducing a peak current instantaneously. PCOPYRIGHT: (C)2009,JPO&INPIT