CONTROLLER OF BRUSHLESS DC MOTOR, AND VENTILATION BLOWER

PROBLEM TO BE SOLVED: To provide a controller for detecting the rotation speed of a brushless DC motor used for a heat exchange type cooler used for cooling an apparatus and controlling the brushless DC motor, capable of improving driving of the brushless DC motor by preventing an overcurrent protection while stabilizing a motor voltage to be output from an inverter circuit, even if a power source voltage suddenly changes to prevent fluctuation of the rotation speed and an increase in the motor current. SOLUTION: The controller includes a voltage detecting means 9 for detecting a power supply voltage value of a DC power supply 6. A PWM output means 10 has control for stably outputting a motor voltage to be output from an inverter circuit 1, irrespective of variation of a power supply voltage of the DC power supply 6. COPYRIGHT: (C)2008,JPO&INPIT