Conversion with low amps out...

[kattos]

According to what i have read on this site there be problems here:

I just finish another motor conversion today but i am not happy with the outcome.

The motor is 1hp one phase 2800 rpm 2pole. I use 30 15x8 neos with plastic blades 4 feet diameter & in test today in strong wind i get 1.3amps in 48 volt battery bank...

is this normal?

[editor's note, by DanG] Resectioned back to Diaries; readability...

[kattos]

[ghurd]

Not much to go on.

My first thought is 60W is not so bad with 4' plastic (PVC guttering?) blades.

(I made many that were much worse)

How fast was the wind?

The magnet poles are NNNSSS?

They could have been closer together (6x5=40 pieces).

It was a 220V 50HZ motor?

G-

[antw]

6x5=40?  Counting the fingers on six hands here shows thirty fingers here.  

Insert witty comment about genetic modification etc.

[ghurd]

Too much time spent under high tension lines?

Either for you or me?  LOL.

My bad.

[kurt]

my first thought was converting a 2 pole motor for use on a 48v system?? i bet that thing has to run crazy fast to hit cut in........  

[Ungrounded Lightning Rod]

Yes, the poles should have been a LOT closer together.  Like each set of 15 magnets covering only about a quarter of the circumference of the rotor.  The way they're spaced out you're close to having 1/3 of 'em canceling out another 1/3, leaving only the remaining 1/3 (plus a fraction from the "nearly canceling") to generate power.

[Ungrounded Lightning Rod]

Make that "the magnets composing each pole" that are closer together, not the "poles".

[tecker]

2800 rpm single means you have very small wire for the windings you'll have to cut some taps in that stator.  I'd say start with ten ohms per and run it up on a jig using a cordless in good shape Match the amperage to the drill specs for torque.

[kattos]

[ghurd]

I don't see a problem with 60W and 4 feet diameter, if the blades are PVC plastic.

It depends on the wind speed, and also the blades.

More magnet is better.

http://www.otherpower.com/images/scimages/2050/kattos.JPG

Very nice work with the magnet cage.

The magnet cage is aluminum, correct?

G-

[Flux]

I think that you could have got nearly double the amount of magnet in there with better spacing but even so you have done fairly well.

Starting from 200v at 3000 rpm  with single phase and full flux you would be looking at a cut in of 3000/1.4 = 2140 rpm for 200v. At 50v you are looking at 2140/4  or about 535 rpm. As you may only have about half flux then your cut in may be up to 1000rpm.

With pvc blades I think you must have seen this 60W in a gale.

Single phase is bad, small high speed motors have little room for much magnet so everything is a against you from the start so you have done fairy well. If you want 48v then you need to rewind, it may do better at 24v or 12v with some reconnection of coils in parallel.

When I look at your excellent work I can't help feeling that if you had put half that effort into building Hugh Piggot's 4 ft machine you would have had an infinitely better result with some output from about 7mph upwards and about 150W at furling point.

I really see the motor conversion as a labour of love rather than an easy solution and anything smaller than about 3 hp 3 phase is a lot of hard work for little potential reward in the end.

Flux

[Jerry]

Hi Flux.

Great compairison with the 4ft Hugh Piggot and this 2 pole motor conversion.

My gole is to compair my 4ft Hugh Piggot genny to my 4ft Jerry Blade Garbogen.

Problem is this will still be some time off yet.

                            JK TAS Jerry

[tecker]

Your geometry is close because  your seeing a voltage in excess of 48 volts . I looked at your files and I 'm assuming this is the Monsoon pump motor . Rated at 3.7 amps you can say the wire size is around 22 or 23 awg . There's some starts in this motor and they are out of phase with the mains so make sure you've got the wiring down .  There's no doubt the resistance is holding you back .Unless you cut in to the stator you can only see 3 amps max at high rpm with heat and maybe some power from the starts .