| 摘要 |
PURPOSE:To control a fan motor in accordance with the various states of a device by providing a switching means which is connected to a DC power source through the fan motor and a signal generating means which controls the switching of a switching means with a control signal. CONSTITUTION:The control signal S1 is impressed on the base of a transistor 31 from the signal generating means 34 through a resistance 35. The control signal S1 with which the switching of the switching means 31 is controlled is on/off controlled according to action performing, standing by, warming up or occurrence of abnormality, and frequency is variably controlled for duty ratio at an on-time. Therefore, an air quantity is made large while the fan motor 32 acts and it is made small while the action thereof stands by, then it is made smaller or stopped while the warm-up is performed and it is stopped when the abnormality occurs. Thus, the fan motor 32 is controlled in accordance with the various states of the device. |
