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  1. Todd619

    Help with electromagnet flux/field calcs

    Thanks UKPete, Lakey and MJR2. I'm looking over all the good info. -Todd619
  2. Todd619

    Help with electromagnet flux/field calcs

    Oh I give up on the symbols. It previews fine, but then they don't show, I'm pasting them from another thread, is there a toolbar I can download for those or something? -Todd
  3. Todd619

    Help with electromagnet flux/field calcs

    Well the symbols for BH (?) value and flux (?) didn't read in my post before in the calcultions so let me try and paste it again *********************************************************** reluctance S = g/(?0*A) where g is the airgap length (m), A is the airgap cross-sectional area (m²), ?0...
  4. Todd619

    Help with electromagnet flux/field calcs

    I'm designing an electromagnet and found the thread "Designing a simple elctromagnet and need help" very helpful, especially UKpete's formula tutorial. I've been playing around with those formulas, but I would like to try to refine the calculations and try to get the calculations as accurate as...
  5. Todd619

    Designing a fairly simple electromagnet and need help

    I'm designing an electromagnet also and found this thread very helpful, especially UKpete's formula tutorial. I've been playing around with those formulas, but I would like to try to refine the calculations and try to get the calculations as accurate as possible. I want to figure in the...
  6. Todd619

    HIGH KV / mm INSULATION

    Thanks for the tip on the acrylic, I had no idea! It just might work for my application. Normally a materials dielectric strength / thickness goes down with greater thickness due to more impurities and flaws in a thicker part, but you seem to say it's the other way around here(?) Also, can you...
  7. Todd619

    HIGH KV / mm INSULATION

    I may have found the material to use, it's called Pyrolytic Boron Nitride (PBN)and it is supposed to have the highest dielectric strength known: 200,000v/mm I would still be interested to hear input on other materials as I would assume that the PBN is probably pricey and doesn't seem like it's...
  8. Todd619

    HIGH KV / mm INSULATION

    I am searching for insulator materials with the highest dielectric strength per thickness possible. The best ones I've found seem to be Teflon @ about 40-80 kV / mm (short time) and CPVC @ about 40 kV / mm (short time). My problem is that all the values I find say "short time", but this is not...
  9. Todd619

    Any low carbone steel dealer in USA

    So the annealing can distort the part, but can the machining afterward heat the part and partially destroy the effects of the annealing? -Todd
  10. Todd619

    Any low carbone steel dealer in USA

    Well I don't mean to stray from the original topic of this thread, but I thought that iron had higher saturation than any carbon steel. Isn't that why pure iron is often used for the pole pieces? I guess I need to find some good charts with the curves shown for these materials, but I'd still be...
  11. Todd619

    Any low carbone steel dealer in USA

    Hi everyone, Newbie question here; MJR2 said in one response that there would be more losses using pure iron than 1020 steel, why is that? thanks -Todd
  12. Todd619

    FLUX FOCUSING WITH POLE PIECE

    Thanks for confirming MJR2's model (MJR2, how could I ever have doubted you?) I was still working on a PM design, but I really think I will hve to abandon it now. Maybe the electromagnet will really be easier to deal with, and possibly cheaper anyway, safer to construct I'm sure. My little...
  13. Todd619

    Nuclear fission/fusion

    You may be interested to check out www.fusor.net for amature fusion(primarily) and fission discussion. The site is more or less dedicated to the "fusor" a simple electrostatic device that seems to inefficiently produce a fusion reaction (pretty solid evidence it's not an "O.P." or "stripping...
  14. Todd619

    FLUX FOCUSING WITH POLE PIECE

    Thanks a lot for that electromagnet design, it gives me a really good idea of what kind of an electromagnet it would take and I could pretty much use that design exactly, except for changing the poles to round. I think that by using an electromagnet it might be possible to design it so that the...
  15. Todd619

    FLUX FOCUSING WITH POLE PIECE

    This magnetic circuit is for what is basically a cyclotron, and is just for my own experiments / hobbyist satisfaction. I have a goal of attaining certain energies of particles so I am definitely trying hard to maximize the field across the gap. Basically increasing the B field by using tapering...
  16. Todd619

    FLUX FOCUSING WITH POLE PIECE

    Thanks once again to UKPete, and yes the cobalt material is almost as expensive as the magnets themselves! Well MJR2, thanks for modeling this design, but I must say that that figure is dissapointing to me. I was sure I could get at least 20,000G. by concentrating the flux from an area of 15cm...
  17. Todd619

    FLUX FOCUSING WITH POLE PIECE

    I actually meant Bg=13500/(1+(1/10))=12272.72G Not Br=.... Am I still incorrect? It's my understanding that one uses the total magnet length in series when figuring for the flux density at the gap i.e. 5cm + 5cm=10, but your figue tends to agree more closely with what I get from the online...
  18. Todd619

    FLUX FOCUSING WITH POLE PIECE

    OK, to use specific values as requested by nbucska, I am planning use (2) N45 grade neodymium magnets 15cm dia. x 5cm thick. I will use a square steel yoke to complete the circuit and also to create a 1cm gap. using Bg=Br/(1+(g/h)) I get Br=13500/(1+(1/10))=12272.72G (this number is probably a...
  19. Todd619

    FLUX FOCUSING WITH POLE PIECE

    I'm working on a design for a magnetic dipole with a steel yoke, most likely using permanent neodymium magnets. My goal is to achieve the highest field possible across a gap over a certain minimum area, with an emphasis on uniformity of the field over this area. My question is if I use a cone...
  20. Todd619

    cyclotron radiation

    I'm having trouble finding a formula for energy loss of a single particle after one revolution in a cyclotron due to cyclotron radiation. Can anyone help? Thanks -Todd

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