KD 760 replaced by KD 777

[Adriaan Kragten]

Report KD 760 is replaced by report KD 777. The title of KD 777 is: "Ideas about a big 48-pole direct drive PM-generator for the VIRYA-6.5 windmill using the housing, winding and armature of a 6-pole asynchronous motor frame size 200 L". Manufacture of the inclined magnet grooves in the armature of the generator as described in KD 760, is expected to be too difficult. KD 777 can be copied for free from my website: www.kdwindturbines.nl at the menu KD-reports.

[Adriaan Kragten]

At 18-4-2025 a new chapter 4 has been added to report KD 777 which describes the very big PM-generator of the VIRYA-6.5. The title of this chapter is: "Using a 4-pole motor frame size 200 L and a 44-pole armature". A 4-pole motor is more standard than a 6-pole motor and is therefore easier available. The armature volume is about a factor 0.85 of that of the 6-pole motor but the number of preference positions per revolution is 528 instead on 432 and so the peak on the cogging torque will be lower. A picture of the armature is given in figure 5 of KD 777.