Fan device, air flow adjustment device and air volume control method thereof

摘要

A motor-driven fan device includes a motor, a processor, a storage with a lookup table stored therein, and a speed detection unit. The processor queries the lookup table or calculates to acquire the target driving voltage and a corresponding target rotating speed of the motor. When the rotating speed difference is not within the range of the preset rotating speed difference, the processor repeatedly adds a gain value to the target driving voltage to acquire a new target driving voltage, acquires the actual rotating speed and the target rotating speed, and determines whether the rotating speed difference is within the range of the preset rotating speed difference. The processor maintains the operation of the motor at the target rotating speed at that point by using the constant speed control method when the absolute value of rotating speed difference is within the range of the preset rotating speed difference.