| 摘要 |
PURPOSE:To provide the most preferable control of a fan motor by a method wherein output data for the fan motor are corrected in response to the difference between a value defined by three elements of elapse time, initial stage difference value and remained difference value, and the rate of actual variation of the fan motor. CONSTITUTION:In case that the rate of actual variation of the number of rotation of a fan motor is in an allowable range of the rate of variation defined by three elements of an initial difference value, elapse time and remained difference, an operation control is carried out under a normal feed-back control of a feed-back control system. However, in case that the rate is out of the allowable range, the correction amount of data corresponding to the difference between the value defined by three elements and the rate of actual variation is calculated and the calculated value is overlapped to the correction value of a normal feed-back control operation. Due to this fact, the continuous variation of the power supply voltage is occurred and a response time is extended only with the normal feed-back control and even if the condition where a hunting and the like and a correction is carried out in response to the variation of the number of rotation of the actual fan motor, so that it is possible to set the number of rotation of the fan motor in an allowable range of the set number of rotation in the same manner as that of the constant power supply voltage. |
