APPARATUS FOR CONTROLLING OPERATION MODE OF VENTILATION SYSTEM Russian patent published in 1999 - IPC

FIELD: automatic control of fans with rotary vanes of impeller. SUBSTANCE: apparatus is provided with unit for calculating current for driving electric motor and controller of electric motor driving current. Controller includes second subtraction unit connected with calculator of driving current, joined with electric motor by means of actuating mechanism for changing driving current. Apparatus also includes pickup of real driving current whose input is connected with electric motor and output - with second subtraction unit and driving current calculator. Unit for adjusting setting angle of impeller vanes and electric motor driving current controller are mutually joined due to connection of input of calculator of setting angle of impeller vane with output of real driving current pickup and due to connection of one input of electric motor driving current calculator with output of pickup of impeller vane setting angle. Apparatus is also provided with detector of harmful impurities of vented flow. Output of detector is joined with input of calculator of impeller vane setting angle. EFFECT: stable operation of ventilation system with high technical and economic characteristics. 2 cl, 1 dwg