Up to now Kragten Design has developed thirteen electricity generating windmills with rotor diameters in between 1.2 and 4.6 metre. Eight of these windmills are designed especially for manufacture in developing countries. All of these windmills are equipped with a 4-pole permanent magnet (PM) generator which is made of an asynchronous motor. The shaft and the short-circuit armature of the asynchronous motor are replaced by a stainless steel shaft and a mild steel armature which is equipped with neodymium magnets. Most generators make use of the standard 3-phase winding which is rectified for 24 V or 48 V battery charging. The rectification of 3-phase VIRYA windmill generators is described in report KD 440 (ref. 1).
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