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# [FEMM] How do I model a multiple turn copper wire coil?

- To: Finite Element Method Magnetics mailing list <femm@list.foster-miller.net>
- Subject: [FEMM] How do I model a multiple turn copper wire coil?
- From: Mike Middleton <mike@wirebenders.com>
- Date: Sun, 19 Oct 2003 13:48:40 -0700
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`I'm a real new user to FEA and magnetic modeling. I DO have a lot of experience in designing and winding transformers, via a hand calculator, pencil, and paper. Most of my work has been in RF and switching power supplies.`
`I have done Examples 1 and 2 of the FEMM Tutorial and have an idea of what's going on.`
`I've been asked to re-design/analyze a magnetic sensor. This sensor is basically a steel cup about 1" diameter by 1" height. The center post is an Alnico 8 magnet about 0.375" diameter. A few hundred turn copper wire coil is wound around the magnet.`
`Of concern, is the electrical output we get from the coil as a piece of steel is passed across the open end of the sensor. I think I can figure out how to model the steel cup and magnet in FEMM.`
`How do I model/enter the multiple turn wire coil? Modeling it turn-by turn will take a LONG time.`
`Thanks,`
``

      Mike Middleton, engineer,  Wirebenders
    Custom Transformers and Similar Devices
              10201 N. 21st Avenue, Suite 4
        Phoenix Arizona, USA, 85021-1827
     voice (602) 861-1856, fax (602) 870-9242
              e-mail coils@wirebenders.com
             Website www.wirebenders.com

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