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Recent content by Mech133

  1. Mech133

    Flux leakage

    Thanks for the insight, the coil does have some non-symmetries as I shaped it by hand and ground the ends on a grind wheel. I could chalk it up to those facts but then I assumed that one side would always be weaker, not reverse with the polarity. At any rate I guess I was looking to see if...
  2. Mech133

    Flux leakage

    I have a gauss meter that I can get rudimentary readings from that confirm the lopsided strength, however the probe is fairly large so it is difficult to zero in on the pole without getting interference from the other. Basically I noticed the significantly stronger pole by hanging a magnetic...
  3. Mech133

    Flux leakage

    I have built an electromagnet in a shape that can be described as a gapped toroid. The core is 1008 LCS of .070" diameter. The diameter of the ring is 1.5" The gap is .200" The coil was wound by hand so I am unsure of the number of turns however it is 36 gage at 10 ohms, one layer. I believe...
  4. Mech133

    Magnetic core uniformity

    I am building a C-core similar to the one shown below. there are coils on both down "legs" of the core, and run in complementing polarity. Size constraints prevent me from using uniform cross-sectional area for the vertical and horizontal sections of the core. The horizontal x-section is only...
  5. Mech133

    Electromagnet: lamination vs. solid core

    I sincerely thank you all for your help and it validates what I have been suspecting for some time. The residual magnetism is not an issue in this application. I imagine the part will have to be annealed after it is cut to the proper core shape for maximum effectiveness? Any increase in flux...
  6. Mech133

    Electromagnet: lamination vs. solid core

    I have experimented briefly with using iron and my results seem to agree with what you have posted. I understand what you mean now that a pulse is not DC operation. I did indeed notice a delay in response time, however that delay was within acceptable limits. What I also noticed that led to...
  7. Mech133

    High Emissivity Coatings

    As high as possible but .97 or better for emissivity The load is very small, dealing with thin(.001") metal substrate sliding over another. Bearing load is small but has to survive over 1mil cycles of sliding back and forth about an inch each time.
  8. Mech133

    Electromagnet: lamination vs. solid core

    Electrical isn't my strong suit but why can't a pulse be DC? It is powered off batteries and the pulse width is 60ms, it is only energized about once every 5 minutes in operation.
  9. Mech133

    Electromagnet: lamination vs. solid core

    Thank you for the information, is there a specific type of iron that gives the best results and are there specific annealing temperatures that I would need to specify?
  10. Mech133

    High Emissivity Coatings

    Anyone know of High Emissivity coatings on metal substrates that also offer good abrasion resistance and low friction?
  11. Mech133

    Electromagnet: lamination vs. solid core

    Right now I am using a coil that is wound onto a bobbin that is .300x.300" footprint and .200" window height. the core area is about .100x.100. The coil is wound to 30ohms and has about 600 turns. I am pulsing 500-800ma upon activation. Currently I am using silicon steel laminations as a core...
  12. Mech133

    Low Friction Coating

    I have an application that calls for an aluminum ring oscillating on axis in a circular alumnimum track by about 15 degrees. the forces are low but the ring will oscillate at up to 30Hz, the parts are about 2" in diameter, .050" thick. Right now I am using regular anodizing for a coating. Is...
  13. Mech133

    Electromagnet Optimization

    I have made progress in my design but am getting hung up on a seemingly easy equation. I have found equations on this forum and elsewhere stating Field Strength (H)=NI/l This gives units of ampere-turns/meter I have a coil of 450 turns, using .3A The coil is wound on a bobbin with a...
  14. Mech133

    Electromagnet Optimization

    The laminations are being used because that is what is readily available. Do laminations cause a degradation in DC magnets or only not add any benefits? If they do cause detrimental effects what is the best core material for a low power DC magnet? repelling a magnet is necessary in this...
  15. Mech133

    Electromagnet Optimization

    Hello, I am looking to design an electromagnet with the greatest flux possible. I am working with very limited power as well as overall volume the coil can occupy. I am using this coil to repel a permanent magnet when pulsed. I am currently using a Si-Fe laminated core of about .250" in...
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