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Development of an 8-pole, 3-phase axial flux permanent magnet gener Development of an 8-pole, 3-phase axial flux permanent magnet generator KD 608

The first version of the VIRYA-1 windmill is described in report KD 574 (ref. 1). The first version has a 6-pole axial flux generator with a 2-phase winding and a steel stator sheet. The eddy currents in the stator sheet  create a sticking torque which increases about proportional to the rotational speed. At this moment it is thought that an 8-pole generator with a 3-phase winding and a synthetic stator sheet is a better choice and report  KD 574 is therefore cancelled. The rotor calculations out of KD 574 are now given in this new report KD 608. The VIRYA-1 makes use of the head and tower of the VIRYA-1.04. The VIRYA-1.04 with a 3-bladed rotor is  described in report KD 518 (ref. 2). The drawings of the VIRYA-1.04 are given in a separate free manual (ref. 3). The VIRYA-1.04 makes use of a Nexus hub dynamo. The advantage is that therefore it isn’t necessary to  build a generator. However, a hub dynamo has some disadvantages of which the most important are that the maximum power is very low (about 6 W) and that there is a large peak on the sticking torque. This requires a rotor with a high starting torque coefficient other wise the starting wind speed will be much too high.




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