Simple to make Hilden-Brand style motor

[Nali2001]

Nice H driver you got there, ya put them 3205's to work again?

Anyway, the slow flux change isn't that caused by the too low volts? Meaning that your volt input is too low for current to start building up quick enough? There indeed is a difference in your current rise curve and magnetism curve. But perhaps the magnetism curve shape can be explained by the air gap behavior? The smaller the air gap gets the lower the reluctance gets and the easier the magnetism build up. An open air gap in such a system is a big hinder for switching the magnet. After all it kinda makes sense that the highest level of magnetism is seen at the end of the input pulse duration since (I presume) the end of the pulse input is also the moment of maximum pole alignment. All in all it seems (to me) the air gaps are too much of a 'resistance'.

[yssuraxu_697]

Well... in past weeks, after learning electrical motor theory I started to suspect that these graphs look exactly like they look. Too bad that theoretical knowledge lagged a bit behind with this and we did not spot the dangers sooner. But please do not dismantle the unit, it still may prove useful in testing coils etc.

The problem is now very sharply if focus and thats a good thing. "Classical" coils will get us nowhere. We need something with lots of turns but very sharp current rise. Impossible? Maybe not.
Also there may be some other, more clever way to change core reluctance.
It will take totally out of the box thinking.

[i_ron]

Nice H driver you got there, ya put them 3205's to work again?

Anyway, the slow flux change isn't that caused by the too low volts? Meaning that your volt input is too low for current to start building up quick enough? There indeed is a difference in your current rise curve and magnetism curve. But perhaps the magnetism curve shape can be explained by the air gap behavior? The smaller the air gap gets the lower the reluctance gets and the easier the magnetism build up. An open air gap in such a system is a big hinder for switching the magnet. After all it kinda makes sense that the highest level of magnetism is seen at the end of the input pulse duration since (I presume) the end of the pulse input is also the moment of maximum pole alignment. All in all it seems (to me) the air gaps are too much of a 'resistance'.

Steven,

I think the simplest explanation is the best. The voltage has a flat top, the current has a flat top after a bit but the flux does not correlate with either.

However it matches almost to a tee the gap distance!

Higher voltage would only make it into a pulse motor. It is the switching of the flux from the magnets that allows the four times power increase of the magnets that should drive the motor.  Maximum flux only takes place in the final closing moments. That is all the proof that I need, lol

Thanks for the H bridge compliment.  For the future I think I will not miss the surface mount "wonder" chips but go with pdip IR2117's for the high side and TC4427's or 4422's for low side. And to simplify the logic, that is get it off board... I have an order in for some "EE-SX4088" , opto's with build in logic,
only 3 bux, worth the simplification.

http://www.omron.com/ecb/products/photo/35/ee_sx3088_4088.html

Ron
 

[lancaIV]

I thought about the Hilden-Brand concept and also about the Klinsing-coil.
Then I worked for a short time with Dr. Pavel Imris to realize his capacitive foil/coil invention.
The target: a very strong electro-magnet with no/low resistance alike this:
http://v3.espacenet.com/publicationDetails/mosaics?CC=DE&NR=19927355A1&KC=A1&FT=D&date=20001221&DB=EPODOC&locale=en_EP

One success with whom I worked:

http://v3.espacenet.com/publicationDetails/description?CC=WO&NR=2009154492A2&KC=A2&FT=D&date=20091223&DB=EPODOC&locale=en_EP

in details:
http://v3.espacenet.com/publicationDetails/mosaics?CC=WO&NR=2009154492A2&KC=A2&FT=D&date=20091223&DB=EPODOC&locale=en_EP

a "simple machine",is it not ?

Sincerely
            CdL

[Kator01]

Hi LancaIV,

in regard to your statement :

One success with whom I worked:

i like know what frequency you used in driving this coil ?

Regards

Kator01