The system efficiency of a motor-driven fan results from multiplying the efficiencies of its individual components. In the case of a fan with EC motor, these are the components motor, commutation electronics and aerodynamic unit. Today's EC motors achieve efficiencies of up to 94 %, depending on the design and power, and commutation electronics achieve efficiencies of up to 96 %.
The greatest potential for improving the overall efficiency of the fan system lies in the aerodynamic part. Using an axial fan as an example, we will look at the progress made in improving efficiency in recent years. It is obvious that not only the fan impeller alone is responsible for the efficiency, but also other aerodynamically relevant components such as nozzles, ...