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permanent magnet DC Generator manufacturers

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Posted by dingus on August 9, 2006, 7:51 pm

Are there any other manufacturers of small permanent magnet dc
generators other than windstream power?  Their DC generators seem sort
of expensive

I currently am using a windstream power 24 volt / 2500 rpm / 10 amp
permanent magnet DC generator with a 4" pelton wheel to charge my
battery bank for powering my house in costa rica.


Posted by Harry on August 10, 2006, 5:42 pm

Have you thought about using an automotive type alternator (actually
generates DC due to internal bridge rectifier?)   Some trucks have 24
Volt systems. You can get the very simple wiring diagram from any
handbook.  Best place to get one is from a breaker (dismantler) second
hand. They are pretty cheap even new and virtually indestructable.
dingus wrote:

Posted by Ignoramus8392 on August 10, 2006, 5:45 pm

There are many Humvee alternators being sold for not too much.


Posted by fredy on August 11, 2006, 7:58 am

dingus wrote:

We also use hydro to charge 24 v  batteries in New Zealand . Here our
some of our washing machines use permanent magnet motors these work in
reverse as generators sometimes need to change connections info is
available. I am sure some appliances ther use permanent magnet motors
all will generate if driven if your lucky may generate right voltage at
rpm but if not a clever person can usually modify them easily

Posted by Eric Sears on August 11, 2006, 11:05 am

Just to add to fredy's post -
I have built or helped others to put together about six or seven of
the microhydro hydro generators that fredy refers to. These use 4''
either pelton or turgo wheels (runners), usually directly driving a
Fisher & Paykel (washing machine brand) Gentle Annie permanent magnet
washing machine motor. In one case we used a Smart Drive motor
instead, which operates at a much lower speed, for a head of just 2
The Gentle Annie (at least; I don't actually know about the Smart
Drive), are made by General Electric. They are available in NZ mostly
for free or low cost, secondhand.
Mostly the Gentle Annies needs about 1500rpm minimum to generate
around 100 to 150 watts (there are a few rewound ones about - but I
don't know if the person doing these can still do so).
I built one system running at over 2500rpm, which generates 200 watts
into a 24v battery (with a head of over 90 metres and a VERY small
flow). Unfortunately the 6202 bearing is not very robust, so at that
speed the generator needs replacing about every two years (the
bearings CAN be replaced - but they are not designed for such).

I don't know what you can get in Costa Rica - but look for old F&P
washing machines of 80's and 90's vintage.

Hope you find what you want.

Eric Sears (also in New Zealand).

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