A Permanent Magnet Generator for Small Scale (小规模的永磁发电机).pdf
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Paper 141 1
A Permanent Magnet Generator for Small Scale
Wind Turbines
J. R. Bumby, N. Stannard and R. Martin
of the generator for mains-connect or battery charge operation
Abstract—This paper describes the development of a are compared with measured data.
permanent magnet generator for small scale wind turbines. The
generator has been designed for ease of manufacture so that it
can be made by small mechanical engineering companies with
limited electrical engineering knowledge. The generator has also
been designed to have no cogging torque so that it can be used
with all horizontal and vertical axis turbine designs. The
generator is efficiency is very high, particularly at part load.
Typical efficiency values are 93-94%.
Index Terms—Wind power; Permanent magnet generators.
I. INTRODUCTION
MALL SCALE wind turbines (less than 20 kW) are typically
S
designed and manufactured by relatively small mechanical
engineering companies. One component that causes
particular problems is the electrical generator as suitable
generators are not always readily available. In the case of
mains-connected turbines the manufacturer is sometimes
Fig. 1. Savonius VAWT (courtesy Rugged Renewables)
forced down the route of using a gearbox and standard 4-pole
induction machine. For smaller turbines the manufact
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