Patent ID: 8482235

Claim:
A fan arrangement ( 20 ) having a fan ( 24 ) driven by an electric motor ( 22 ), which fan arrangement comprises: an apparatus for detecting the electrical power (P ist ) consumed, during operation, by the electric motor ( 22 ); an input apparatus ( 28 ) for inputting a desired rotation speed (n soll ) of said electric motor; a comparison apparatus ( 26 ) for comparing the desired rotation speed (n soll ) with the actual rotation speed (n ist ) of said fan arrangement ( 20 ); a controller ( 27 ), which regulates the rotation speed of the electric motor ( 22 ) by pulse width modulation ( 34 ); a comparator ( 76 ), which compares the electrical power (P ist ) consumed by the fan arrangement ( 20 ) with a predetermined characteristic value (P max ) for the fan arrangement ( 20 ), which value is characteristic of a maximum permissible motor power; and a limiting arrangement ( 29 ) for limiting the output signals ( 36 ) of the pulse width modulation ( 34 ) whenever the electrical power (P ist ) consumed by the fan arrangement ( 20 ) exceeds said maximum permissible motor power (P max ).