3ph 1/2hp motor conversion , rewire ? or not

[ibedonc]

I have turned down the rotor on a 3ph 1/2hp a/c motor   to take 12 N and 12 S neo

like these http://www.rare-earth-magnets.com/SearchResult.aspx?CategoryID=21&KeyWords=Segment&All=True

Product ID:   NSN0025

Product ID:   NSN0026

they will be place 2 side by side and 12 (6 north x 6 south) around the rotor

this is a 230/460v motor , I really do not want to rewire it , unless it will not work

otherwise , I have not counted the poles yet , but they are a lot , I would say more then 20 , what is the best way to wire it up , I want low speed high voltage windgen

I got these motor for free and also have a 1hp that I may play with

Jerry you out there

[tecker]

   If your thinking amps you gata think about 14 awg or more I'm shure I get some disagreement from those in the know . But to run cool and jack some amps you gata

have some mass to generate amps.

[Electric Ed]

I doubt if the stator winding has more than 20 poles, perhaps you mean coils, which is quite different.

A typical 3 phase winding would have 3 coils per pole per phase, for a total of 18 coils for a 2 pole winding, or 36 coils for a 4 pole winding.

Try to determine the coil span, in other words, how many slots are spanned by an individual coil.

The center-to-center distance between the rotor poles (magnets) should be the same as the coil span.

That size motor probably has the phase windings wye connected internally. Does the motor have 9 leads or 12?

Electric Ed

[ibedonc]

Misunderstand poles , thinking the stator slots were poles

it is a AO Smith motor with 12 leads , 18 coils , coil spans 6 slots

since my magnets do not cover a coil span , could I put two norths side by side to cover it. they are wide enough then , that would give me 3 north poles and 3 south

if this would not be good enough then could rewire it 3 slots which the magnets cover fine , the only problem it is going to be a lot of work getting the old wire off , that

stator is in that housing good. if I do rewire , what do you suggest for turns

thanks

 

[Victor]

  "since my magnets do not cover a coil span , could I put two norths side by side to cover it. they are wide enough then , that would give me 3 north poles and 3 south"

 This sounds like it will work,but be prepared for cogging. The cogging will exist because of not having skew.

[Ungrounded Lightning Rod]

Space the magnets so the combined pole is about as wide as the combined stator poles surrounded by a single coil.

An easy way to figure out how many poles you need is to look at the rated line frequency and RPMs.  A two pole will be a bit less than 3600 RPM at 60 Hz, a four-poll a bit less than 1800 RPM, and so on.

Alternatively, count the coils:  On a typical three-phase you have (coils * 2 / 3) poles.  (You have half as many poles as coils in a phase, because each coil provides two runs of wire under the magnets, one front-to-back, one back-to-front, and is driven by two poles simultaneously.)

[Jerry]

Hi ebedonc.

Sorry bout the delayed responce.  What will be the charging voltage when done?

If its 24v or higher I would not rewire at first. Try it as is. I use my 3 phase conversion this way. Wire the motor in its low volt scheam. Generally 208/240v as oposed to its 440v option.

                               JK TAS Jerry

[ibedonc]

do you think 4 of your blades would be big enough for this one

do not know what the volts will be yet because I will not get my order of magnets

until monday , then I have to figure out how to connect this one up because it does not

have a wiring diagram on the motor

it has 12 wires , do you how I get to the wye common ?

[ibedonc]

this is the motor I have

http://www.aosmithmotors.com/pdf/catalogs/150/PAGE64.pdf

and this some good info on motors , it mite have answered my wiring question

http://www.aosmithmotors.com/pdf/brochures/bulletin3100/acdc.pdf