PMG stands for permanent magnet generator. This booklet describes how to build one. It was prepared in year 2000 by Hugh Piggott, for Intermediate Technology Development Group (ITDG), as part of an overseas aid project for DfID. It is not confidential; in fact the object is to disseminate it widely.
Date: Thu, 29 Aug 2002
I have built a number of axial field pmg's (down loaded
from your excellent website) and I am very pleased with
them. I have recently had a batch of mild steel discs
305 dia. x 6mm with a 65mm hole at the centre as per
plans lazer cut (very nice finish).
and I thought that some pmg constructors or would be
constructors may have difficulty in cutting out or
obtaining such discs. I would therefore be happy to
supply discs at a very good price of six pounds each
plus postage. I hope this could help others to enjoy
constructing there own pmg/windmill as I have. I can be
contacted by e-mail or phone 01305 861001 or snail mail
at 18 Tillycombe Road, Portland, Dorset, Dt51lg,
England. Yours sincerely Andy Taylor
Here's a picture of the stator which is the stationary bit which holds the coils. The coils are set in resin. Here below the resin is clear so you can see the coils embedded within. A magnet rotor passes on each side of this disk and produces AC voltage in the coils.
Another magnet rotor fits on top of the stator. Next, in
this early picture, I am spinning the alternator with a power drill to
collect data about the output at various speeds.
Here is a set of pictures detailing the way the stator is cast in a
And here is the rotor casting process:-
and flight :-)
I am also teaching courses where you can learn how to do this.