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Magnets, steel and shapes for ac-dc motor conversions
By nothing to lose, Section Homebrewed Electricity Posted on Tue Apr 13th, 2004 at 07:54:50 PM MST
Will this work, magnets and steel?

If you can't get curved (cupped) magnets for motor armaturs now, could you make a piece of steel the right size to replace the needed magnets and then either place a strong magnet behind the steel or cut a hole in the center of the steel.
What I am thinking is to maintain the correct shape, airgap, spacing, let the steel "spread" the magnet force. The steel could be machined or forged (hammered) to the correct curve.
Would that work? If not any reason why? I do figure you would need large "powerful" magnets to energize the steel this way. Since steal itself will hold a magnetic charge for awhile when exposed to strong magnets I thought this might posibly work.

Magnets, steel and shapes for ac-dc motor conversions | 3 comments (3 topical, 0 editorial)

Re: Magnets, steel and shapes for ac-dc motor conv (none / 0) (#1)
by dozer on Tue Apr 13th, 2004 at 09:01:48 PM MST
(User Info)

This is exactly how every car-alternator is built....and every hybrid stepper-motor as well.

If you look at the rotor of an alternator, you'll see 2 steel pieces formed into sets of 'fingers' which are the poles. These are press-fit onto the shaft. Between these two pole-sets is a coil of wire...the field-coil. Basically, this field coil IS a magnet...when you put 12v to it.

The field flows from the end of the 'magnet' up and around to a 'finger', through the stator pole via the airgaps, then into another finger on the other pole-piece, and back into the other end of the 'magnet' (coil).

You can pull such a rotor apart and replace the field-coil with a PM, and it will work just the same.

Inside the rotor of a hybrid stepper, there are axial permanent magnets in the same basic configuration.

Curved iron magnet retainers... (none / 0) (#2)
by monte350c on Tue Apr 13th, 2004 at 09:07:34 PM MST
(User Info)

Hi,
Great idea!

I've been planning something like this too -

My thinking is along the lines that getting something in that gap other than air would be good.

If it's iron, then it would conduct the flux a lot better than air. Plus if you made them hang out over the ends of the magnets a little bit, you might be able to drill the iron pieces with a countersink, then use a small countersunk allen on each end which would help hold the magnets in.

I'll post anything I get on this...

More fun and too many projects!

Ted.

Re: Curved iron magnet retainers... (none / 0) (#3)
by picmacmillan (rmacmill@sympatico.ca) on Thu Apr 15th, 2004 at 08:21:08 AM MST
(User Info) http:// www.frecklefarmloghomes.com

i seen some curved magnets on e-bay from a guy who sells magnets and such ....not sure if it's what you're looking for but...drills12 was his user i.d.......hope that helps......pickster
http://www.frecklefarmloghomes.com
[ Parent ]

Magnets, steel and shapes for ac-dc motor conversions | 3 comments (3 topical, 0 editorial)

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