Simple to make Hilden-Brand style motor

[Honk]

Thanks Honk, so what you are suggesting there is a four lobe rotor?

I'm not sure of the rotor, but that is easy to figure out if you draw the basic design in autocad and fiddle around.

[i_ron]

I'm not sure of the rotor, but that is easy to figure out if you draw the basic design in autocad and fiddle around.

Autocad? I haven't even figured out how to use paint yet, lol

No, sort of a defacto standard is the 6/4 in reluctance motors, as it gives the least torque ripple.
Either four lobes and six coils or four coils and six lobes.... (and generally is a self starter)
(which you already know but some others might not...)

Ron

[wizkycho]

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

[Nali2001]

Hi there Wiz,
I'll give ya my opinion.
Some time ago I build an variable reluctance motor or 'attraction motor' Which works essentially like the motor discussed here. Only it does not have/use magnets.
http://home.planet.nl/~sintt000/Forum/Motor03.jpg
The stator was from a normal induction motor. But rewound for 2 phase dc pulse based power.
http://home.planet.nl/~sintt000/Forum/Stator.jpg
The rotor because it is hard to build was made from solid steel.
http://home.planet.nl/~sintt000/Forum/Rotor01.jpg
Now the problem is with solid steel is not only the eddy currents (which are massive I might add)
But the main issue the solid steel has is that it is 'slow' You see, in an ideal case you want the fingers of the rotor to drop their magnetism before aligning to the next stator section. If it does not, then you in essence have a magnet approaching a stator and there will be an Bemf induced/lenz And this will work against your switching input need and system rpm. You can also see it like this, if the rotor remains to have some level of magnetism all the time then it is working as a generator while you are motoring. In an ideal world you want to attract the rotor finger in and then release it. And once releases it has to drop it's fields before the next alignment occurs. And lamination are much faster in this. But these laminated rotors are hard to make without plenty of sheet laminations to work with. Also if your rotor maintains a too large amount to residual magnetism after the 'stator alignment attraction phase' is over you will end up with the situation that the rotor resists to some extend to leave the stator alignment and will cause a drag and rpm loss. Fast material is a must, that is why flynn's better motors use metglas cores. Which can blast into the khz easily.

Maybe my rotor build method will help you:
My version of Jacks motor is totally made from commercially available C cores. Which are grain aligned thin ribbon wound laminations.
http://home.planet.nl/~sintt000/Forum/Hilden001.jpg
So the rotor is like this:
http://home.planet.nl/~sintt000/Forum/Rotor.jpg
For a motor like so:
http://home.planet.nl/~sintt000/Forum/Motor.jpg
Machining the rotor like that also gives you a perfect round rotor in relation to the axle, which means it is perfect balanced. Ready for paper sheet tight air gaps.

Due to the grain alignment these cores are very responsive to magnetic fields and don't keep 'any' residual magnetism after a input pulse. The cores are fast...
This video shows some core differences:
http://home.planet.nl/~sintt000/CoreTests.wmv
(Don't mind the text in he vid since back then it was for something else)

[JackH]

Hello Nali2001,

I couldn't even understand Wate you said.   You talk to sintific  stuff.


Hello wizkycho,

The motor is a two rotor motor, that govt it time to relaxe the first coil and resin the sencon col.  The rotor is just as wide as two of the field windings, Thai what what it need to relaxe the first coll and reattain the second.

Jack