Sorry to get into the discussion, I would suggest to Skyrob that the secondary core rotate 90 degrees and wind it accordingly. Thus the primary coils are closer and the secondary one contains the same amount of core as in length, but larger coil diameter. I attached the picture posted by Marathonman, this way of placing the secondary supports this idea.
Due available material Im using recycle MOT's one core as per my picture is just one primary with two coils on single core
Nothing is changed from original Figueras idea to have opposing primaries and secondary between. to pick up all magnetic activity coil must be in line with primaries and can't work and will not work on 90 degrees to primaries.
As MM stated - secondary is taking advantages of bulging field between primaries.
And also electromagnetic force is finding easiest path into secondary core due advantage in permeability in iron versus Air . there is no field trying to jump from North to South all is taken by secondary cores
I have checked this with magnetic film indicator ( green plastic film)
How ever this is one of many possibilities and i'm not sure if this will work. Only one way to find out.......
Post by Marathonman on Feb 19, 2020 8:28:23 GMT -6
Electromagnetic force as you state will find the shortest path possible always and two cores one NN and the other SS is the shortest path before entering the secondary, physics facts. but you are right it is your build and one way to find out.
good eye Emil and nice observations. yes your suggestion is optimal use of bulging magnetic fields with his cores except his grain orientation will be wrong thus hampering magnetic flow.
PS. the more compression the more pronounced the bulging magnetic field. take advantage of it folks. Regards, Marathonman
It was just an idea, however the primary coils are wound on the coil principle with the median socket, when the fields of the same polarization (NN or SS) in the middle. In my opinion the secondaries on the ends should not be wound (at the first test), through them passes 1/2 of the magnetic flux. Success, a very interesting construction! All the best. EmilP
however the primary coils are wound on the coil principle with the median socket, when the fields of the same polarization (NN or SS) in the middle. In my opinion the secondaries on the ends should not be wound (at the first test), through them passes 1/2 of the magnetic flux.
Im sorry I don’t understand your comment please explain?
I like to bring to your attention that MOT has E-I lamination If you remove central part then is just outside To unfold this material gives you total length of core Primary coil normally would be one but there is no problem split one primary coil into two If I do that I get one core total length off 200 mm Secondary being 50mm will give ratio 4:1
This concept is the same as horseshoe core with two coils on each side Wired in series or parallel
Post by Marathonman on Feb 21, 2020 8:04:55 GMT -6
I personally think using 4 to 1 is overkill and a waste of material when a 2 to 1 will suffice which the other material can be put to other uses or other cores. the larger secondary is very good and should produce a good output. Regards, Marathonman
The vise weighs 13.7 kg (30.2 lbs). Current of 13 Amps. The second coil is used as a ballast to limit the current.
Last Edit: Feb 21, 2020 9:34:47 GMT -6 by creasysee
Part G: toroid ID 63mm/2.48", OD 127mm/5", h 93mm/3.66", area is 29,76cm2/4.61"2, 76 turns 4mm2/AWG 11, 38 taps (one tap per two turns), 85mH Commutator: 76 pins. Primaries: Core: 2.5cm/0.99" x 4cm/1.6" x 10.5cm/4.13" area 10cm2/1.55"2, 271 turns 2.5mm2/AWG13 (5 layers of classic winding) Secondaries: in developing
Post by Marathonman on May 13, 2020 17:52:45 GMT -6
Hello everyone, just putting together my power supply. am working on the box to install it in and waiting for br and fans to come in. 120 to 100 volt with the short wires to the right of the secondary being 12 volt for cooling fans. to the right of the second pic is the voltage and amperage meter with current shunt. the silver square to the left is an EMI filter which be connected to my Variac.
Post by Marathonman on May 15, 2020 20:24:44 GMT -6
It may look ugly but it will function as planned. here is the box i am building for my power supply with the volt/amp meter installed. one odd thing about this meter is with no power to it current is measured but when power to the unit is supplied voltage is measured so i need a 12 volt switch on the face. ps. bearing holder will be 3D printed instead of CNC for faster building of controller with newest Cura. Regards, Marathonman