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3 HP motor conversion | 21 comments (21 topical, editorial)
Re: 3 HP motor conversion (3.00 / 0) (#12)
by briskwinds on Sat Apr 19th, 2008 at 09:35:43 AM MST
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Waiting for Dinges to chime in too.



Re: 3 HP motor conversion (3.00 / 0) (#14)
by Flux on Sat Apr 19th, 2008 at 09:37:48 AM MST
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I think he has gone to ground for the present.
Flux

[ Parent ]


Re: 3 HP motor conversion (3.00 / 0) (#15)
by vawtman (vawtman(at)charter(dot)net) on Sat Apr 19th, 2008 at 11:46:41 AM MST
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Peter had a little problem on irc i think,hope he comes back from it.

 I would do it 12pl and increase the mag diameter to 23mm has you can't do it with 2 rows of your current mags i don't think.Will need to mill flats.

 Then use a multiple in hand winding to keep the volts down.12 pl would be easier and better has Flux stated.

 Just my .02

 Mark

[ Parent ]



Re: 3 HP motor conversion (3.00 / 0) (#16)
by briskwinds on Sun Apr 20th, 2008 at 12:24:09 AM MST
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Hello vawtman,

Like to know how you arrive at 23 mm for 12 pole.

Also, cant I decrease my pole width by using the same 13mm magnets, but arranging it like this image?




[ Parent ]



Re: 3 HP motor conversion (3.00 / 0) (#19)
by wdyasq on Sun Apr 20th, 2008 at 09:56:57 AM MST
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Briskwinds,

One must be careful who where they get advice. Ignorant or bad advice costs the same as educated and well reasoned advice on this forum.

When you lay your magnets out, be sure and consider the inside diameter of your 'cage'. Some have carefully laid out and drilled a few holes to find they 'met' on the inside and the design had to be rethought.

"I have found a small `motor manufacturer' who is very helpful. He is helping me in motor conversion(3HP). He will skew the stator for me, will wind the stator with any wire size and will also make full iron rotor."

It is quite possible the "small `motor manufacturer'" will be your most reliable source of input for this project. If you are skewing the stator, the rotor does not need skewing.

If "I" were doing your project (and I am not, it is not my time and/or money) I would think of the layout of the magnets to the inside of the rotor and then consider the 'sweep' of the outside. I would also wire 'two in hand' and then could parallel for 12V and series for 24V.

If our departed friend 'zubbly' were doing this project, he would have good input. He would also do a 'test winding' to determine projected voltage. From there he would calculate proper 'fill' for the slots and what size wire must be used.

Remember, this is your child. It is best you do your part and make sure it gets the best education and verified advice. If someone else 'screws it up', they don't have to live with the result, you do.

Ron
Adventure is just bad planning." -- Roald Amundsen
[ Parent ]



Re: 3 HP motor conversion (3.00 / 0) (#17)
by briskwinds on Sun Apr 20th, 2008 at 05:00:00 AM MST
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Thanks Vawtman,

I understand. 23 mm pole width near the stator teeth (3 teeths). My two magnets will side by side will cover more than that. A single 23 mm magnet will be of same width on the rotor and near the stator teeth. So 12 Pole is out of question for my magnet size.

But what about 6 pole. How many teeths per coil so that I can find what the length of the pole and see if my magnets fits it perfectly.

Secondly is it true that wire size doesn't matter for test winding. We only need to know the voltage at cut-in speed from the test winding.

[ Parent ]



Re: 3 HP motor conversion (3.00 / 0) (#18)
by vawtman (vawtman(at)charter(dot)net) on Sun Apr 20th, 2008 at 05:53:00 AM MST
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 For 6pl you would have 4 open slots.~46mm.2 coils per group.Has flux stated

I could upload a pic of a partial 4pl winding later if you want.It has 6 open slots

 your motor man should understand this i would think.

 Mark

[ Parent ]



3 HP motor conversion | 21 comments (21 topical, 0 editorial)

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