Patent ID: 6462494
Filing Date: 2002-10-08
Classification: F04D,Y02B

Abstract:
A fan comprising a fan wheel and an electric motor driving said fan wheel, and a control unit for controlling a motor output as a function of fan-specific data, whereby an actual-value signal corresponding to an actual rotational speed of the fan is measured and compared with a control signal corresponding to a required speed, and said actual speed is adjusted to said required speed by said control unit, said actual speed and at least one of an actual motor current and a supply current being measured and conducted to a microcontroller as input signal variables, said fan-specific data including at least one of wheel diameter, density of a conveying medium, fan coefficients, and motor coefficients, and a preset artificial characteristic curve ps=Æ’({dot over (V)}s) being stored in said microcontroller as default values, said microcontroller operable to generate said required-speed signal which is a function of at least one electrical current variable and said actual speed, based on said preset artificial characteristic curve ps=Æ’({dot over (V)}s), where &rgr;a=required operating pressure and Vs=required volume flow.