| 摘要 |
PURPOSE:To make it possible to readily control variously a fan by controlling a DC brushless motor to control the rotating speed of blower blades, thereby improving the starting characteristic at low speed time to stabilize the low speed rotation. CONSTITUTION:A rectifier 4 is connected through a filter 3 with a commercial power source 1 to supply a variable voltage controller 26. The controller 26 energized a motor 11 through a drive circuit 25. A fan operation selective controller 27 feeds a variable voltage control signal to the controller 26 to control the operation of the motor 11. |
