| 摘要 |
PURPOSE:To always optimally control by selecting a correction coefficient in response to a deviation range between a set rotating speed and the actual rotating speed, and calculating target rotating speed data on the basis of the coefficient and the set speed. CONSTITUTION:A differential amplifier 60 outputs a deviation amount between set rotating speed data es and the actual rotating speed data em, comparators 41-46 and exclusive OR circuits 31-33 detect the range of the deviation amount and output a signal. Adders 11-14 multiply the correction coefficient in response to the outputs of the circuits 31-33 by the deviation amount, add the rotating speed data corrected to the set rotating speed data es to apply the target speed data St to a fan motor drive circuit 70. Thus, the fan motor can be preferably controlled in all deviation range. |
