A Permanent Magnet Generator for Small Scale （小规模的永磁发电机）.pdf

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