| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide electric equipment such as a blower and a ventilator capable of coping even with a little air volume variation in a process of air volume constant control, capable of reducing an air volume variation even when a temporary pressure loss changes, and capable of realizing the air volume constant control for shortening even a converging time. <P>SOLUTION: This blower is constantly operated by the air volume indicated by an air volume indicating means by using an electric current supplied to an inverter circuit and a rotating speed detected by a rotating speed detecting means, and includes a low voltage DC voltage converting means 8 composed of a chopper circuit, a current detecting means 21 for detecting an electric current supplied to the inverter circuit 6, and a supply current value control means 22 for performing feedback control while varying voltage output from the low voltage DC voltage converting means 8 by controlling a low voltage DC voltage value changing means 14 so as to be constantly controlled by an electric current value of indicating an average electric current value detected by the current detecting means 21 and supplied to the inverter circuit 6, thus achieving a characteristic for reducing an air volume variation to a load change. <P>COPYRIGHT: (C)2010,JPO&INPIT |
