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Motor Conversion
By henjulfox, Section Homebrewed Electricity Posted on Sat Dec 31, 2005 at 02:28:36 PM MST
Temporary glue for magnets

I have a 1 1/2 hp, 4 pole, 3 phase motor I'm converting to a generator. I'll be
using curved neo's for the magnets. The neo's are small, 1" wide, 1 1/2" long, but
fit the curve of the turned down rotor pretty well. I would like to try a couple
different magnet configurations to see what the output looks like - First just 4
magnets, then 2 lengthwise for a pole 3" long to cover the length of the rotor, then
2 side-by side for each pole to cover the circumfrence of the rotor, etc. I assume
the best results will be 2 wide and 2 long to fill the rotor but I will enjoy seeing
the results as I work up to that.
Anyone have a suggestion for a glue the will hold the magnets well enough for
testing but can later allow the magnets to be removed? I figure Elmers would work
good enough when there are no serious forces between the magnets but I don't figure
it would work when I try to force two similar poles side-by-side. Thanks,
-Henry

Motor Conversion | 12 comments (12 topical)

Re: Motor Conversion (3.00 / 0) (#1)
by terry5732 on Sat Dec 31, 2005 at 10:47:15 AM MST

Elmers would be long set time and won't bond to magnets or any other smooth surface. If you have clearance, try arranging with hot mmelt glue and wrapping with electrical tape. The glue is for sliding only and the tape is to hold against centrifugal pull. I think E tape is about 3-4 thou per wrap if stretched. Some cellophane may be OK too but about 4-6 thou per.

Re: Motor Conversion (3.00 / 0) (#2)
by henjulfox on Sat Dec 31, 2005 at 12:06:01 PM MST

Excellent idea! Thank-you.
-Henry

[ Parent ]

Re: Motor Conversion (3.00 / 0) (#5)
by DanB on Sun Jan 01, 2006 at 12:24:02 PM MST

yes, I was thinking tape would be nice too. A small bit of 'super glue' might also go a long ways, and it breaks pretty easily (its brittle).

[ Parent ]

Re: Motor Conversion (3.00 / 0) (#3)
by wildbill hickup on Sun Jan 01, 2006 at 06:17:00 AM MST

Definatly not elmers. I just had a very long battle with small rectangular magnets on a 3 hp conversion( I had to get 9 of them in a pole). Depending on the strenth of the mags they definatly resist being forced together to form one pole. On several occasions I had them pull away from epoxy that wasn't quite cured(felt hard). You may want to drill some small holes in the armature and in the mags and screw thwm down with flat-head screws. Check out zubbly's responce to a post at http://www.fieldlines.com/story/2005/12/16/22349/331

about 3/4 of the way down. This may take some extra time and I'm not sure it will work for you, but his discription of what to do is quite complete (along with photo's)

Re: Motor Conversion (3.00 / 0) (#4)
by vawtman on Sun Jan 01, 2006 at 06:37:59 AM MST

Happy New Year Henjufax Im at the same point with my conversion with the same size neos.Ive decided to go 4 per pole unskewed.Planning on installing the mags tomorrow.Ill have a 1/16 airgap.It will be interesting following your testing.I cant think of a better temp hold that should work.Good luck.P.S Are the neos #110as.

Re: Motor Conversion (3.00 / 0) (#6)
by henjulfox on Sun Jan 01, 2006 at 03:27:31 PM MST

Yes, they are the 110A's sold by CFI on E-bay. Powerful little suckers.

I'm sure I'll end up at 4 per pole. If nothing else, I want to see how hard it is to
insert and remove the rotor with the magnets attached. Gotta be easier starting with just 1 per pole.

I'm figuring my finished product will have the magnets skewed a little by offseting
the second set of magnets. Any reason you're not going that way?

-Henry

[ Parent ]

Re: Motor Conversion (3.00 / 0) (#7)
by vawtman on Sun Jan 01, 2006 at 04:47:48 PM MST

Henry, Skewing them the way you mentioned was my original plan.I have a 36 slot stator like yours.I talked to an old guy with many years working on generators and he claimes cogging shouldnt be a problem.However this alternator idea was new to him.As far as setting the rotor with those buggers,Im a rookie also,but there are some good post a few days back.I wouldnt attempt to drill them and they need coating.Lets keep in touch and good luck.

[ Parent ]

tape (3.00 / 0) (#8)
by wdyasq on Sun Jan 01, 2006 at 07:28:15 PM MST

I would consider 'strapping tape' with the fiber-glass strands in it for securing the magnets. It is difficult, if not impossible, to stretch.

Ron
Adventure is just bad planning." -- Roald Amundsen

Re: Motor Conversion (3.00 / 0) (#9)
by nothing to lose on Mon Jan 02, 2006 at 03:20:09 PM MST

I used super glue to hold 1 mag per pole, it might work for you with mutiple poles also?
The super glue held the mags ok for testing and running some, but a sudden shock like drop the motor and they poped loose. Should be easy to remove them latter then.

If you can find a plastic bottle a little larger than your armature you can shrink wrap it. I saw that posted here long ago by someone and have tried it with good results, if you can find the right size bottle. Just cut the ends off the plastic bottle slide over armature and magnets then heat with a heat gun. It shrinks nicely, makes a really tight fit, even molds itself around the mags. It shrinks in length also, so you might want want to leave it longer than the armature and trim after shrinking it.

Maybe a combination of the two would work well. Super glue to hold the mags in place when mounting and untill shrink wraped. To take apart, cut bottle and unwrap, a gentle tap should pop off the mags breaking the super glue bond or nail polish will disolve the super glue.

The big question though is if the super glue will hold to magnets trying to push apart when building up poles. Give it a try, and fast seting time, easy to remove, Nothing to lose
.
nothing to lose

Spelin and tpying are my strong points, not electronics.

Re: Motor Conversion (3.00 / 0) (#10)
by vawtman on Mon Jan 02, 2006 at 03:56:56 PM MST

The plastic bottle I found that fits the stator I.D nicely was a ceramic tile grout container.Im using that to protect the windings during reassembly.I told my wife that the grout was too lumpy thus,killing two birds with one stone.

[ Parent ]

Re: Motor Conversion (3.00 / 0) (#11)
by henjulfox on Mon Jan 02, 2006 at 07:06:35 PM MST

Man, lot of good ideas. Thank-you all!

-Henry

[ Parent ]

Re: Motor Conversion (3.00 / 0) (#12)
by vawtman on Sun Jan 08, 2006 at 09:27:09 AM MST

Henry,Hows your conversion going?

Motor Conversion | 12 comments (12 topical)

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