Abstract
This paper proposes the pole change generator for windmill. Since the micro windmill system generates power from natural energy, power generation characteristics of a wide band are necessary. However, the conventional generator, where the open voltage is simply proportional to rotational velocity, encounters difficulty in generating power across a wide range of rotational velocity from low to high, in view of power generation characteristics.
To develop a generator of a wide power band suitable for micro windmill, this paper proposes a technique of switching the status of generator coil connection. To prove the effectiveness of pole changing, we assumed a pole-changing generator with 16 coils as an example. The coils can be connected by four patterns: 16-pole series, 8-pole 2-parallel, 4-pole 4-parallel, and 2-pole 8-parallel.
Then, theoretical and experimental studies from this point of view demonstrate that this technique is effective.
