Patent ID: 7567045
Filing Date: 2009-07-28
Classification: B60N,H02P

Abstract:
1. Method for controlling a direct current motor in one or several fan units, each comprising a fan, which method comprises: generation of a control signal from a first control unit which is external in relation to the said fan unit; transmission of the said control signal to the said fan unit; reception of the transmitted control signal in the said fan unit; interpretation of the said control signal in a second control unit which is arranged in association with the said fan unit; and generation, in the said second control unit; of a supply signal for the said direct current motor, on the basis of the control signal generated by the first control unit and received in the fan unit and on the basis of a supply voltage; wherein the method further comprises: transmission of the control signal together with the supply voltage over a shared communication link, with the control signal being superposed on the supply voltage.