Abstract
Most of the generators and electric motors developed in recent years are synchronous machines using permanent magnets of rare earth. As the name suggests, rare earth permanent magnets are expensive because they have a small amount distributed on the earth. In addition, the price fluctuation is large because it is concentrated and mined in a specific region. Therefore, in recent years, research has been actively conducted on developing a generator using a low cost ferrite permanent magnet for stable supply and reduction of the price of the generator. Ferrite magnet has a low magnetic flux density compared to a rare earth permanent magnet, so a large amount of permanent magnet must be used. In particular, the generator rotor is made in the form of a spoke to insert a large amount of permanent magnets. There are three typical spoke type types. This paper compare three types of characteristics at the same size and the same output.
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