Hello everyone! This log gonna be long-term one (not long)
Why? Well, of course there would be an update about new version of control circuit, which should arrive .. in some period of time (says "Export of international mail" since 20th of May), but periodic logs about how things going are gonna be less periodic, because almost everything what can be done to make first version of an actuator a reality was done, really:
- control circuit is fully tested, it retains energy well and controls everything what needed, as beta-version it works amazingly well and I hope it gonna work even greater with a new PCB : )
- technology of stripe manufacturing is fully developed, reliable and easy, all problems were fixed, I like current design of stripes too, as it provides great pulling force
^ this picture represents duel with fluid dynamics and glorious victory (thanx, corn syrup!)
Of course, I've measured a pulling force, now I have a nice equipment for that!
Everything there is measured with 20kg magnets on each side and 10x10x4mm inside:
- stripe can reduce it's length at least on 60%. more? possible, but with different proportions
- stripe provides from 500 to 660 grams of pulling force on it's own, I found that pretty persistent!
- attraction force between big magnets (or electromagnets) increases pulling force - 1kg to 1.5kg
Only one thing is not ready - electromagnets. Of course, I've done one and showed it in previous log, but it still can't provide significant attraction forces - it has flaws. About them:
First of all we need to have a look at coil itself. Wire here (along with current) works as a source of electromagnetic field, shown on the left side, and further we place core from wire - weaker field becomes. We need this field to orient magnetic field of our core's material atoms, which works as an "amplifier".
That means: less layers of wire we have in our magnet - more efficient use of current we get.
Also, material of core really matters, parameter called permeability is significant - so we need to get best material we can. That's why I want to use hydrogen chamber, to make Fe annealed in it. As I told in previous logs - such a material has one of greatest characteristics which is possible to get, so it's quite helpful in that project, but requires some time and additional equipment.
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