| 摘要 |
PURPOSE:To accurately and rapidly control the rotation of a fan motor by controlling of feed back the real rotating speed of the motor to coincide with the set rotating speed at every time, thereby limiting the influence of the irregularity in the physical and electrical characteristics of circuit parts to the minimum limit. CONSTITUTION:A main controller 1 selects are rotating speed data E1 corresponding to the data group contained in advance so that the rotating speed of a fan motor 4 becomes the set value, and output it to an energizing time setter 2. At this time, as a result of the irregularity of circuit parts, if the energizing time must be corrected, the controller 1 adds the data E1 to the correcting amount data formed in advance immediately after a power source is turned ON. Thus, the actual energizing time of the motor 4 can be set to the time of substantially the same degree as the case that no irregularity exists in the circuit parts. |
