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Forums
4hv.org :: Forums :: Electromagnetic Radiation
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Flat coils

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Carbon_Rod
Sun Jun 13 2010, 03:58PM Print
Carbon_Rod Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
I'm seeking an accurate model of low frequency (<100kHz) and DC characteristics of etched copper PCB coils.

There are numerous contradictory results from various online calculators:
Link2

Not really a wireless power thread, but more related to this persons motor design:
Link2

Except I'm interested in how efficient a reluctance version would operate.

Cheers,
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radiotech
Mon Jun 14 2010, 04:50AM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
From what is visible in the Utube it seems the wire-spring brush set just switches the DC to field coils and the rotor is a flat magnet set (like a pancake motor in a floppy drive. Note how the coils wave, the ones nearest the rotor moreso.

Faraday's homopolar motor and Barlow's wheel moved smoother.

Get the book Brushless Permanent-Magnet Motor Design by Duane C. Hanselman- Mcgraw.

Perhaps you could make a reluctance-syncronous pankake motor by designing saliencies among flux gaps.
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Carbon_Rod
Tue Jun 15 2010, 05:14AM
Carbon_Rod Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
A brushless current limiting drive system is planned, but unfortunately the use of Permanent Magnets would interfere with design rules.

The issue is with trace properties that differ for surface and layered PCB.
Mostly the non-linear temperature related issues are presenting a scaling issue.

Thanks for the reply,
Rod
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Mattski
Tue Jun 15 2010, 06:11PM
Mattski Registered Member #1792 Joined: Fri Oct 31 2008, 08:12PM
Location: University of California
Posts: 527
Take a look at Link2
I don't know how easy it'll be to use, but it seems to be what it's designed for.

You can also peruse Link2 to see if there are any other good simulators.

Most recent literature on this topic is likely in the context of on-chip inductors and transformers, you could use those as search terms. But they're more worried about high frequency inductance, not low frequency. Most people who make such things use HFSS, CST, Momentum, and other programs to simulate.
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