Simple to make Hilden-Brand style motor

[nievesoliveras]

Hi!

@nali2001
For the first time I understood perfectly the core and coil relation and the need to choose the right core.
Thanks!

Jesus

[i_ron]

JackH, I_Ron and others that started to experiment !!!

how did you actually make rotor ?

http://ca.youtube.com/watch?v=5prfWVc--dc ? rotor on this movie - is it from laminates

I'm thinking that laminates are not must (just yet) if whole rotor is of el. conductive material (Al) with (permeability 1) with attractive sections
from allso el. conductive material but much higher permeabiliti and low remanence ferro-nickel-cobalt (perm 4000-5000). that way eddy currents will develop but in a very big volume of conductive material so rotor wan't heat up and eddy current will "disperse" in material and wan't cause dragback.

are my toughts on this non acting eddy currents worth a dime here ? (ergo or koen1 don't respond on this, I alredy know what you think as if you wrote it alredy)

Many Thanks and good experimenting

Wiz

Hi Wiz,

Yes, that rotor is a steel tube (pipe) with bars made of laminations.
They are welded at each end to the tube. As I may have mentioned this rotor was made for a
different project and was not intended for a "Jack Valve"

You are correct... this is the wrong place for laminations. The resultant flux flow is lengthwise when
engaged ... but... on approach the flux has to jump from plate to plate perpendicular to the flow.

This I proved to my self in a test between two bars, one of cast iron and one of laminations. The cast
iron had a greater pull in strength.

Cast iron is what they use in junk yard electromagnets. It is the only material available to me that
I could use. Any powder metal, zen dust, Somaloy, etc would be better but costs too much.

Steel, as you know, is what they can use to make magnets, it is a high carbon steel that made the
horse shoe magnets in a model T ford. You can still buy chrome steel magnets
http://www.indigo.com/magnets/gphmgnts/chrome-steel-horseshoe-magnets.html
So only in its most pure form can you use steel... such as SAE 1010, some times SAE 1020
Easy enough to test, hold a magnet on the end off your piece of steel and lift some pins... remove
the magnet and the pins should fall off instantly.... any lingering means bad steel for this purpose.

Try this test with a piece of cast iron and you will find that cast iron makes a poor permanent magnet!

It would seem from Jack's remark that he is using a rotor with two bars on it. My new rotor will
have six bars, the bars being bolted to the tube from the inside. Then I will use four coils giving
a two phase motor in operation.

Not carved in stone... whatever works for you.

Ron

PS: the rule of thumb for the spacing should be "the space between bars can be two times the
width of the bar"  That is, the coil/core when energized will reach out 8 to 12 mm, if the bar is say
25 mm wide, then the total field width can be 45mm, or more, wide. If you energize the coil/core
at midpoint it will be attracted to the approaching bar AND the trailing bar equally, a no no. The
coil/core should "see" only the approaching bar when fired.

[JackH]

Hello  i_ron,

Just make sure that the rotor is at least as twice as the field coils, or the Timmie will be off.  the coil haft to turn of and the next coil needs to turn on, that the timing you need.  The magnetic switch is slow, in other word the time it take to turn one coil of and turn the other coil on it quite slow.
Also the silicon steel has to be running the same way the valve is.

The rotor is in my Creation, all I haft to do is wind the coils.


Latter,,,,,,,,JackH

[i_ron]

Hello  i_ron,

Just make sure that the rotor is at least as twice as the field coils, or the Timmie will be off. 
snip

Latter,,,,,,,,JackH

Thanks for that Jack

Ron

[wizkycho]

thanks for so many advices !

@Nali You are really far ahead with these HQ precision supersmall gap motors - any results so far ?

since I can not afford laminates yet I'll go with SS430 Cr Fe. It is interesting I can not find table or chart with magnetic properties,
type and chemicall composition for stainless steels.(just few types per article)

@All
Now there is thing, at first I'm thinking using everyday underunity el. generator, but allso thinking ahead constructing FE generator to fit on
a shaft of this motor.

any recommendations - there are many methods, I allso have some idea about it, but like to hear what method would You choose.
and of course what type of underunity el. gen to use ?

Thanks

Wiz