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Air gap vs test coil voltage | 13 comments (13 topical, editorial)

Re: Air gap vs test coil voltage (3.00 / 0) (#2)
by Flux on Sat May 10th, 2008 at 01:25:01 AM MST
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That bit in brackets should have been (1.2T ish) but the actual value depends on magnet grade. It's the slope of the line from Br to half Br at magnet length that really matters so if you used Br of 1.3T then at magnet length it would be 650mT.

Flux

[ Parent ]

Re: Air gap vs test coil voltage (3.00 / 0) (#4)
by vawtman (vawtman(at)charter(dot)net) on Sat May 10th, 2008 at 10:30:57 AM MST
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Flux, Did you mean to say depth instead of length?

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Re: Air gap vs test coil voltage (3.00 / 0) (#5)
by commanda (alwynne at unwired dot com dot au) on Sat May 10th, 2008 at 03:04:08 PM MST
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Perhaps I can answer this;

Distance through the magnet from the North face to the South face.

You can, of course, get magnets which are magnetised lengthwise, with the poles at the end. Useless for an axial flux pma. But it does show that the term "length", which could be taken as a physical dimension, could be confusing. Used in context of the discussion, it refers to the length of the internal magnetic path.

Amanda

[ Parent ]

Re: Air gap vs test coil voltage (3.00 / 0) (#6)
by vawtman (vawtman(at)charter(dot)net) on Sat May 10th, 2008 at 03:28:11 PM MST
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Thanks Amanda and have fun with your neat little project.

I was thinking in terms of say a 1x2 magnet with 2 being the length.

I'm o.k now i think :)

Mark

[ Parent ]

Re: Air gap vs test coil voltage (3.00 / 0) (#7)
by martin1 on Sat May 10th, 2008 at 03:34:43 PM MST
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In a dual rotor would the "magnet length" be the thickness of two magnets?

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Re: Air gap vs test coil voltage (3.00 / 0) (#8)
by commanda (alwynne at unwired dot com dot au) on Sat May 10th, 2008 at 03:49:41 PM MST
(User Info)

Yes. Realised I should have made that clear after I hit the post button.

Amanda

[ Parent ]

Air gap vs test coil voltage | 13 comments (13 topical, 0 editorial)

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