Rotational speed detection method and rotation speed detecting device of the blower

摘要

PROBLEM TO BE SOLVED: To provide a rotational speed detection method and device, which is inexpensive and easily mountable on an existing blower.;SOLUTION: In this rotational speed detection method, a pulsation frequency of wind generated from a blower 10 is detected by a sensor 16, and the pulsation frequency is divided by the number of rotating blades 11b of the blower 10, to thereby find the rotational speed of the blades of the blower 10.;COPYRIGHT: (C)2011,JPO&INPIT