Motor driving apparatus and a refrigerator using the same

PROBLEM TO BE SOLVED: To expand a drivable load region at a high-speed operation of a brushless DC motor while improving efficiency by suppressing a current in case of high-speed/high-load driving. SOLUTION: When the brushless DC motor is driven at a high-speed, a second waveform generator detects a load state from a phase difference between a waveform generated by itself by a load detector 18 and an induced voltage of the brushless DC motor, and controls an electrical conduction at a proper conductive angle corresponding to the load state determined by a conductive-angle controller. The second waveform generator further generates the waveform of a fixed duty at a frequency set by a frequency setter 8, and imparts a voltage waveform driving the brushless DC motor to an inverter 3. Consequently, the current advancing angle of the brushless DC motor can be held properly and the driving region of the brushless DC motor can be expanded while improving the efficiency. COPYRIGHT: (C)2011,JPO&INPIT