Articles for december 2018

Folder VIRYA-1.75W + 1.8W added

A folder about the recently designed VIRYA-1.75W and the VIRYA-1.8W windmills is added at the menu VIRYA-folders.

KD 669 added

Report KD 669 has been added to the menu KD-reports. The tittle of this report is: “Calculations executed for the 2-bladed rotor of the VIRYA-1.75W windmill (lambda design = 7, wooden blades) with a Chinese axial flux generator of Hefei Top Grand model TGET165-0.15KW-500R used for 12 V battery charging”. This generator has been tested for some years in combination with the VIRYA-1.65 rotor with cambered stainless steel blades but this rotor appeared to be too noisy. It is expected that the VIRYA-1.75 rotor with wooden blades will be more silent and that the maximum power is higher because of the larger rotor diameter.

KD 669 contains detailed drawings of the rotor and the generator bracket. The head and the tower of the VIRYA-1.81 can be used. Photos of the drawings of head and tower are given in the manual part 2 of the VIRYA-1.81 which can be copied from my website. The big advantage of the VIRYA-1.75 is that no generator has to be built. The used generator has been measured (see KD 595) and can be ordered directly in China. The generator is of type axial flux but the housing is completely closed.

KD 668 added

Report KD 668 has been added to the menu KD-reports. The tittle of this report is: “Ideas about a 24-pole permanent magnet generator with a stator with no iron in the coils for the alternative VIRYA-4.2 rotor for battery charging or for combination to the 1.1 kW, 3-phase asynchronous motor of a centrifugal pump”. So the VIRYA-4.2 with this generator can be used in two different ways depending on the winding which is chosen. This 24-pole PM-generator is rather light for its armature volume as it has a hollow armature and aluminium bearing covers. It might be possible to use this generator as synchronous motor to drive an electric car or boat. This use is explained in chapter 7 of KD 668.