report KD 727 about the 4-bladed VIRYA-12 availabel

[Adriaan Kragten]

Report KD 727 can be copied for free from my website: www.kdwindturbines.nl at the menu KD-reports. The title of this report is: "Calculations executed for the 4-bladed rotor of the VIRYA-12 windmill (lambda design = 5) with the pendulum safety system with a torsion spring connected to a PM-generator made from an asynchronous motor frame size 355".

This rotor has a very low noise level because it has wooden blades and a rather low design tip speed ratio of 5. The visual acceptance might be large because it has four blades, just as a traditional Dutch windmill.

[Adriaan Kragten]

A new chapter 9 has been added to report KD 727 about the VIRYA-12. The title of this chapter is: "Ideas about a real 60-pole PM-generator". The advantage of a 60-pole generator is that the frequency is much higher than that of the 6-pole or 12-pole generator as described in chapter 8. This enormous generator is based on the largest standard asynchronous motor frame size IEC 355L.

[Adriaan Kragten]

A new chapter 10 has been added to report KD 727 about the VIRYA-12. The title of this new chapter is: "Ideas about other PM-generators with a high pole number". The pole numbers described are 64, 68, 70, 74 and 76 for a stator with 72 slots.

[Adriaan Kragten]

A new chapter 11 has been added to report KD 727 about the 4-bladed VIRYA-12. The title of this chapter is: "Use of a PM-generator of Hefei Top Grand type PMG900-I-30KW-100R". This generator is also used in the 3-bladed VIRYA-14 as described in report KD 732.