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Telcon Strip Wound Toroidal Cores

  1. Dec 27, 2009 #1
    Does anyone know where one could find such a material that is either by ordering online where delivery can be within a week to Toronto or a store near/in the city of Toronto?

    Much appreciated.
     
  2. jcsd
  3. Dec 27, 2009 #2

    berkeman

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    Staff: Mentor

    What is the application? What are your target specs?
     
  4. Dec 28, 2009 #3
    Two tape wound toroids are needed for a three-axis vector magnetometer that will be built within the week.

    The target specs:
    http://http://www.telcon.co.uk/PDF%20Files/TELCON-CORES.PDF" [Broken]

    Page 5, table 4, 7a

    Thank you very much for your time.
     
    Last edited by a moderator: May 4, 2017
  5. Dec 28, 2009 #4

    berkeman

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    The link does not appear to be working for me. Even the base URL is not working for me:

    http://www.telcon.co.uk

    .
     
    Last edited by a moderator: May 4, 2017
  6. Dec 28, 2009 #5

    berkeman

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    Update -- I finally got the base URL to work (flaky website?), and then was able to paste in the rest of the URL to get to the PDF. Whew.

    But I'm still not very clear on the transformer construction or uses. It looks like the toroids are actually made from laminates? So when they say "strip wound", it is not referring to using strips for the actual conductors wound on the core, but rather that the core is constructed of laminated conductor materials with insulation between the laminations?

    What is the advantage of using this construction? I can see it for low-frequency power applications, but in sensor applications? THe PDF mentions the use in Hall Effect sensors (which it sounds like is your intended application), but how is a toroidal transformer used in a Hall Effect sensor?
     
  7. Dec 28, 2009 #6
    The solid ferrite toroids seems to cause high interference when they are close to each other. The tape wound toroids would be sufficient to suppress the frequency interference. Is there a store location where I can get it within the week?
     
  8. Dec 28, 2009 #7

    berkeman

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    Staff: Mentor

    Toroids should have minimal magnetic cross-coupling, and any electric field cross-coupling can be easily taken care of with grounded shields between the toroids. Laminated construction is generally used to minimize eddy current losses for low-frequency transformers, and I don't see how laminated construction could have anything to do with cross-coupled interference.

    If you need some of their product, why not just call this telcon company directly? Seems like the quickest approach.
     
  9. Dec 28, 2009 #8

    The Electrician

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    You didn't say what core material you want; see table 3.
     
  10. Dec 28, 2009 #9

    The Electrician

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    The OP wants item 7a from table 5, but at the bottom of table 5, the manufacturer says:

    "Cores in the range 0a – 5c are regularly produced, whereas cores in the range 6a – 14b
    can be manufactured to order, subject to our normal minimum order quantity."

    It's likely they won't have any stock.
     
  11. Dec 28, 2009 #10

    The Electrician

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    You might try Dexter:

    http://www.dextermag.com/Office-Locations.aspx [Broken]
     
    Last edited by a moderator: May 4, 2017
  12. Dec 29, 2009 #11
    You haven't stated specifically what your tape-wound toroid core requirement is. I have used special tape-wound cores in the past. Their special application is for cores with very thin laminations (~1 or 2 mil, for high bandwidth and low eddy current loss) and high permeability (>20,000) tape (special alloys and heat treatment). Give us more information on your dimensions, tape thickness, and permeability.
    Bob S
     
  13. Dec 31, 2009 #12
    I have found what I was looking for. Thank you all for the information.
     
  14. Jan 1, 2010 #13
    Fluxtration,

    Getting magnetics on short order can be difficult. If you run short, you might try mag-inc. It sounds like your alloy is permalloy or supermalloy.

    I've also built core-based fluxgates using flat loop amorphous material from Allied Signal. You can get that material from Eastern Components magnetics.

    - Mike
     
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