Claw-pole machine design and tests for small scale direct driven applications

The direct driven generators in wind energy conversion systems avoid the noise, the vibration and potential risk caused by the gear box resistance. The permanent magnet claw-pole generator, due to its large number of poles, simple and reliable construction, is a competitive variant for a direct driven generator in a wind mill at small and medium power. Such a sample generator is analyzed here based on magnetic field calculations and respectively tests. In the paper a new method to identify the generator parameters based on load characteristics is introduced. Applied on the sample generator designed, constructed and tested the identification procedure proves its accuracy and viability.