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 described pole numbers are: 64, 68, 70, 74 and 76 for a stator with 72 slots.
Articles for december 2022
KD 712 reviewed
A new chapter 7 has been added to report KD 712 about 5-phase and 9-phase rectification. The title of this new chapter is: “Ideas about a 32-pole generator with a 9-phase winding”. This winding is much simpler than the 9-phase winding of a 4-pole generator as described in chapter 5.
KD 727 reviewed
A new chapter 9 has been added to report KD 727. The title of this chapter is: “Ideas about a real 60-pole PM-generator”. The advantage of this generator is that the frequency is much higher that that of the 6-pole or 12-pole generator as described in chapter 8.
KD 580 reviewed
A new chapter 7.5 has been added to report KD 580. The title of this chapter is: “Using a 6-pole stamping frame size 112 and 17 magnets size 40 * 10 * 4 mm”.
KD 718 reviewed again
It appeared that there was a fundamental mistake in the magnetic flow as given in figure 2 of KD 718. It isn’t allowed to have an iron pole in between two magnet poles. Report KD 718 has therefore been reviewed completely and frame size 112M is chosen instead of frame size 100. Now all four mechanical north poles are formed by magnets and all four mechanical south poles are formed by the iron of the armature. Chapters about other frame sizes are cancelled.
On 19-12-2022 a new chapter 6 has been added to report KD 718. The title of this chapter is: “Use of a 4-pole motor frame size 132 and 28 magnets size 50 * 20 * 5 mm”.
KD 727 reviewed
Chapter 8 of report KD 727 about the VIRYA-12 windmill has been reviewed. The generator armature which had 68 mechanical poles has been changed into an armature with 60 mechanical poles. The advantage of this new armature is that it can be used in combination with the original 6-pole 400/690 V stator winding if the magnets are orientated in the correct way. The magnets can also be orientated such, that a special 12-pole winding can be used. The advantage of a 12-pole winding is that it has the double frequency as for a 6-pole winding.
KD 718 reviewed
Three new chapters 8, 9 and 10 have been added to report KD 718. The title of chapter 8 is: “Ideas about a 30-pole PM-generator using a 6-pole motor frame size 100L”. The advantage of a 6-pole motor is that the armature volume is larger than for a 4-pole motor of the same frame size and so the maximum torque level will be larger too. The title of chapter 9 is: “Ideas about a 20-pole PM-generator using a 4-pole motor frame size 112M”. Use of a larger frame size also results in increase of the maximum torque level. The title of chapter 10 is: “Ideas about a 30-pole PM-generator using a 6-pole motor frame size 160L”. This rather big generator can be used for a 3-bladed windmill rotor with a diameter of maximal 5 m.