Patent ID: 7244106
Filing Date: 2007-07-17
Classification: F04D,F05D,G05D,Y02B

Abstract:
1. A method for flow regulation at a fan ( 3 ) having a suction side, the fan powered by an electric motor ( 2 ), specifically for maintaining the flow from a fan at a constant level, said fan having a filter ( 5 ) positioned at the suction side of the fan, characterized in that values representing actual power consumption and speed of the motor ( 2 ) are determined, in that a pulse signal (p) is created in the motor ( 2 ), which pulse signal indicates the position of the motor's rotor, said pulse signal being converted into a speed indicating signal, a control unit ( the control unit ( the control unit ( and that new ones of the values representing actual power consumption and speed of the motor are determined repetitively until there is no deviation of the values representing actual power consumption and speed of the motor.