Acoustic Noise Analysis of an External Rotor Ferrite Permanent Magnet Airborne Wind Generator

In this paper, the magnetically excited acoustic noise emitted by an external rotor permanent magnet generator for airborne wind energy is investigated. First, the Maxwell stress tensor is calculated to derive the magnetic forces on the rotor. Then, a structural model of the rotor is built and an experimental modal analysis is conducted to validate the model. Finally, the magnetically excited acoustic noise of the machine is simulated for the whole operating map and evaluated for a typical flight cycle of the kite.