Design of a 15-MW Magnetic-Geared Generator

This paper describes the mathematical design approach of a 15-MW magnetic-geared generator for an offshore wind generator considering a required power factor. The magnetic-geared generator has a low-speed rotor which consists of steel pole pieces unlike a conventional synchronous generator, and this changes the phase angle of a magnetic flux between the high-speed rotor and stator under load. In addition, the back-EMF, and
$d$
and
$q-\text{axis}$
inductances are influenced by the phase angle difference between rotors. In this paper, the stack length, and number of coil turns are mathematically designed. Finally, the output power of the mathematically designed magnetic-geared generator is computed using 2-D finite element analysis, and the effectiveness of the proposed design method is discussed.