Fan and method for determining a media flow moved by the fan

Abstract

A fan is described, with the aid of which a volume flow and/or a mass flow of a medium moved by the fan () can be determined. This fan comprises an electric motor () and an impeller () driven by the electric motor (), wherein the impeller () moves a gaseous medium in a media flow from an inflow side () to an outflow side (). The fan additionally comprises a pressure sensor system, a speed ascertainment system, and an evaluation unit. The pressure sensor system is designed to ascertain an actual pressure difference (Δp*) between a first region () and a second region (), wherein the first region () and/or the second region () is/are formed in the electric motor (), wherein a pressure (p) prevails in the first region (), which corresponds to a pressure (p) present on the inflow side, wherein a pressure (p) prevails in the second region (), which corresponds to a pressure (p) present on the outflow side. The speed ascertainment system is designed to ascertain an actual speed (n) of the impeller (). The evaluation unit is finally designed to quantitatively determine a mass flow and/or a volume flow of the medium based on the actual pressure difference (Δp*), the actual speed (n), and a pressure characteristic curve of the fan (). Furthermore, an electric motor for this fan and a corresponding method are disclosed.