Author Topic: 48 volt permanent magnet genny???  (Read 2306 times)

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don lobo

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48 volt permanent magnet genny???
« on: February 04, 2008, 11:19:18 PM »
i have had a harris 48 volt turbine since 1998.


specs:



  1. nozzles
  2. ' of head
  3. inch pipe
  4. GPM
  5. lbs pressure static and dynamic...doesn't change when it is flowing


the alternator cum generator is a 24 volt ford with a stock rotor and a custom london flynn 386 y stator. supposedly i should get 1700 watts or 36 amps although i only ever get something in the mid 20's for amps as measured by an inline ammeter, always less when the genny has warmed up and becomes less efficient.


i have been frustrated over the years as the harris design genny's don't last as long as i'd like,, somewhere between 4-8 months. it's a pain to always have to have 2 backups in case the one in service goes down, which it does at inoppurtune times.


sooooo...i'm looking for a lower maintenance option which looks like a permanent magnet  generator.


any tips on good ones that will generate as much or more power?


thanks


dave

« Last Edit: February 04, 2008, 11:19:18 PM by (unknown) »

TomW

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Re: 48 volt permanent magnet genny???
« Reply #1 on: February 04, 2008, 04:36:40 PM »
don;


First question I will ask is:


Home Built, Off the shelf or custom made to order for you?


I think all are probably good options.


An AC motor conversion could probably be built to meet the need. Probably the same with an axial flux. Off the shelf, I have no clue.


Maybe DanB would build you an custom axial. I think his current big mill is in that class on power.


Good luck tracking down a solution.


Cheers.


TomW

« Last Edit: February 04, 2008, 04:36:40 PM by TomW »

BurksFallsMan

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Re: 48 volt permanent magnet genny???
« Reply #2 on: February 04, 2008, 09:15:02 PM »
Don Lobo: Yo tengo... I mean I have a Fisher & Paykel PMG from Australia or New Zeland ( I got it from Nando37 in this board.

Search for Fisher & Paykel in eBay Australia and you will see one for $24.00 as of Friday.

Also you can look at my files here and will see the animal.

According to nando37 it can give close to 500 to a 1,000 watts.

Mine is running at 380 RPM (+/-) and puts out 3 phase AC at 120 volts to go on the line to the house (approx 400 feet) then 3 transformers and a set of 3 bridges gives me the 12 Volts to charge batteries.

It can be configured to any (practically) voltage you want, but better use higher voltage to lower losses until you get the power to the house.

I only get 80 watts because of low flow and low head (21 feet head and 5 liters/second).

There as also a local (US) gentleman that sells the motors here in US. his website is called joesomething, but cannot remember what the something is... (old age).

If you need more help I will research.

My PMG is almost maintenance free, bearing maybe once a year.

Wilson Gonzalez (BurksFallsMan)


I may not be spelling right Paykel.....so try until you get it

« Last Edit: February 04, 2008, 09:15:02 PM by BurksFallsMan »

Flux

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Re: 48 volt permanent magnet genny???
« Reply #3 on: February 05, 2008, 01:04:48 AM »
What speed?
« Last Edit: February 05, 2008, 01:04:48 AM by Flux »

spinningmagnets

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Re: 48 volt permanent magnet genny???
« Reply #4 on: February 05, 2008, 05:32:07 AM »
Here's a good "how-to" on the F & P. I just saw F & P washing machines in the US last year, apparently very popular in other places for quite a while?


http://www.thebackshed.com/Windmill/AssemblyA.asp#3

« Last Edit: February 05, 2008, 05:32:07 AM by spinningmagnets »

wpowokal

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Re: 48 volt permanent magnet genny???
« Reply #5 on: February 05, 2008, 06:58:44 AM »
Comanda, on this board did some tests on F&P motors as have others, here is one link

http://www.fieldlines.com/story/2004/8/16/25634/3113


allan down undewr

« Last Edit: February 05, 2008, 06:58:44 AM by wpowokal »
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BurksFallsMan

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Re: 48 volt permanent magnet genny???
« Reply #6 on: February 08, 2008, 07:18:06 PM »
I think that about 360 - 380 RPM.

The winding was cut and 2 bunches, 3 phases, I did it following nandos's instructions.

Wilson
« Last Edit: February 08, 2008, 07:18:06 PM by BurksFallsMan »