Report KD 667 can be copied for free from my website:
www.kdwindturbines.nl at the menu KD-reports. The title of this report is: "Ideas about a 12-pole permanent magnet generator using a motor housing frame size 100 and a stator without iron in the coils for use in combination with the VIRYA-3B3 rotor".
As this radial flux PM-generator has no iron in the coils, it has no iron losses end therefore it will have a high peak efficiency of about 0.9. It has no clogging torque and if this generator is used in combination with the VIRYA-3B3 rotor, it therefore has a very low starting wind speed of about 2.3 m/s. So this wind turbine can be used in regions with low wind speeds. The advantages of using the housing of an asynchronous motor are that the magnets and the coils are well projected against water and dust and that these components are relatively cheap because they are mass produced.
A PM-generator with no iron in the coils is more expensive than a PM-generator with iron in the coils with the same maximum torque level (like the 38-pole generator as described in report KD 648) because magnet and copper costs are much higher. However, the higher investment pays back in a higher output and a better starting behaviour for the whole lifetime of the wind turbine.
To give an impression of this generator, I have added the assembly drawing as given in figure 2 of KD 667 in the attachment.
