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book.png Kragten Files: 10
ing. Adriaan Kragten

Aangezien ik al een aantal jaren met pensioen ben, heb ik niet langer inkomsten nodig uit de verkoop van mijn (Engelstalige) KD-rapporten over kleine windmolens. Ik heb daarom besloten dat vanaf nu alle openbare KD-rapporten gratis door iedereen gekopieerd mogen worden. Dit betreft tien extra rapporten met voormalige prijzen tussen € 20 en € 40. Mijn belangrijkste rapport is zeker KD 35: Rotor design and matching for horizontal axis wind turbines. Rapport KD 196 geeft vragen en antwoorden over elk hoofdstuk van KD 35 in het Engels en het Nederlands. Een lijst met alle 46 gratis KD-rapporten wordt gegeven als het eerste onderwerp van het menu KD-rapporten op mijn website: www.kdwindturbines.nl. Alle rapporten hebben een tamelijk lange titel die een goede indruk geeft van de inhoud.
 
Het recentste rapport is KD 598: Ideas about the 3-bladed VIRYA-0.65 water turbine with 20° inclined shaft coupled to the generator of the VIRYA-2.68 windmill for 12 V battery charging.
 
pdf.png Generator with housing 5RN112M04V and neodymium magnets Download
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Measurements performed on a generator with housing 5RN112M04V and a 4 - pole armature equipped with neodymium magnets

KD200

pdf.png Generator with housing 5RN132M04V standard winding and neodymium magnets Download
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Measurements performed on a generator with housing 5RN132M04V with a standard 400/690 V winding provided with a 4-pole armature with neodymium magnets

KD82

pdf.png Generator with housing 5RN90L04V and neodymium magnets Download
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Measurements performed on a generator with housing 5RN90L04V and a 4-pole armature equipped with neodymium magnets

KD78

pdf.png Simple 6-pole, 2-phase axial flux permanent magnet generator Download
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Development of a simple 6-pole, 2-phase axial flux permanent magnet generator for the VIRYA-1 windmill using a bicycle hub and 6 neodymium magnets size 25.4 * 25.4 * 12.7mm

An axial flux generator with no iron in the coils has almost no sticking torque and therefore it isn’t necessary to use a rotor with a high starting torque coefficient. In stead of the 3-bladed rotor of the VIRYA-1.04, a 2 bladed rotor with a diameter of 1m is designed. This rotor has a design tip speed ratio d= 4.25 and is made out of one aluminium strip with dimensions 125*1000*1.5 mm. The blades can be cambered using the same blade press as designed for the VIRYA-1.04 rotor. The calculation of the rotor geometry is given in chapter5. The windmill with this rotor will be called the VIRYA-1. Although the VIRYA-1 rotor is a little smaller than the VIRYA-1.04 rotor it is expected that the same head and tower can be used.Only the vane blade thickness has to be increased from 1.5 mm up to 2 mm.

pdf.png Calculations for the Virya 1.04 Download
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Calculations executed for the 3-bladed rotor of the VIRYA-1.04 windmill (deltad=3.5, 7.14% cambered, aluminium blades) meant to be coupled to a Nexus hub dynamo.

The 3-bladed rotor of the VIRYA-1.04windmill has a diameter D = 1.04m and a design tip speed ratio deltad= 3.5. Advantages of a 3-bladed rotor are that the gyroscopic moment is not fluctuating and that a 3-bladed rotor looks nicer than a 2-bladed or 4-bladed rotor. The rotor has blades with a constant chord and is provided with a 7.14% cambered airfoil. A blade is made of an aluminium strip with dimensions of 1.5 * 125 * 500 mm.32blades can be made out of a standard sheet of 1 * 2m, 50 blades can be made out of a standard sheet of 1.25 * 2.5 m and 72 blades can be made out of a standard sheet of 1.5 * 3 m without waste material. For cambering of the blades, a simple blade press is designed. Tools for twisting the blades and for pressing the head bearings in the tower pipe,are also designed.

pdf.png Permanent magnet generator for the VIRYA-1.36 Download
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Development of an 8-pole, 3-phase axial flux permanent magnet generator for the VIRYA-1.36 windmill using 8 neodymium magnets size 25.4 * 25.4 * 12.7mm. Design report of the rotor (deltad= 5, B = 2, stainless steel blades).

The armature consists of a rectangular galvanised steel sheet size 156* 156 * 3 mm. 128 sheets can be cut from a standard sheet size 1.25 * 2.5 m. Eight neodymium magnets size 25.4*25.4 * 12.7mm are glued to the back side of the armature sheet at a pitch circle of 125mm such that four north poles and four south poles are created.

pdf.png Ideas about 34-pole permanent magnet generator for the VIRYA-3.3S Download
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Ideas about a direct drive 34-pole permanent magnet generator for the VIRYA-3.3S windmill using the stator stamping of an Indian 6-pole, 3-phase, 2.2 kW asynchronous motor frame size 112 and 51 neodymium magnets size 40 * 10 * 5 mm

The minimum number of stator poles for a 3-phase winding is 3. The armature must have an even number of poles. If there is only a difference of one in between the number of stator poles and the number of armature poles it means that the number of stator poles must be odd. So the number of stator poles can be 3, 9, 15, 21, 27, 33, 39, 45, 51, 57, 63, 69, 75 etc. So none of these values matches with the available number of stator poles for standard stator stampings.

pdf.png Check of the hinged side vane safety system Download
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Method to check the estimated δ-V curve of the hinged side vane safety system and checking of the δ-V curve of the VIRYA-4.2 windmill

pdf.png Darrieus rotor, a few advantages and many disadvantages Download
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The Darrieus rotor, a vertical axis wind turbine (VAWT) with only a few advantages and many disadvantages

pdf.png Estimated curve of the hinged side vane safety system Download
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Method to check the estimated δ-V curve of the hinged side vane safety system and checking of the δ-V curve of the VIRYA-3.3D windmill (7.14 % cambered steel blades)

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