| 摘要 |
PROBLEM TO BE SOLVED: To control ventilation wind volume to a fixed value even if operation condition is changed from initial pressure loss when turning on power supply. SOLUTION: A ventilation wind volume controller is provided with a blower on which a DC motor performing PWM control of ventilation wind volume control is mounted, a number of revolutions detection means for the DC motor, an wind volume indication means of the blower, and a storage means storing the number of revolutions of the DC motor for operating by wind volume indicated by the wind volume indication means and has a control means controlling duty % of a PWM control signal so that the number of operation revolutions detected by the number of revolutions detection means becomes the same number as the number of revolutions stored in the storage means. The ventilation wind volume controller has a plurality of suction ports corresponding to ventilation of a room, a plurality of blowers corresponding to them, and one air exhaust port for the plurality of blowers in common. Each blower controls ventilation wind volume independently from each other. COPYRIGHT: (C)2004,JPO
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