Permanent magnet generators with high power densities required for aerospace applications have been studied. The use of high energy density, high coercivity magnets can result in generators with power densities of the order 20 W/g at 50000 r.p.m. The power density in these machines is not limited by magnet performance, but rather by losses in the stator. Under these conditions, we have shown that a conventional radial field magnetic circuit is optimum in terms of power density. At power levels below 2 kW and speeds above 30000 r.p.m. flux concentration in the rotor magnetic circuit can lead to better performance. The more esoteric configurations, such as the claw rotor, may be economical due to simpler construction, but are not competitive in terms of power density. The results presented could form the basis for choosing a specific configuration for detailed design. The equivalent circuit and optimisation methods outlined ca give an detailed initial design at a specified rating, which can then be refined for manufacture.
Permanent magnet generators for aerospace applications: optimisation of power to weight
Permanenterregte Generatoren fuer die Luft- und Raumfahrt: Optimierung des Leistung/Gewichtsverhaeltnisses
1987
5 Seiten, 12 Bilder, 12 Quellen
Conference paper
English
Permanent magnet generators for aerospace applications
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