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tyuo59 Contact options for registered users 's Avatar (by Gravatar) posted on
December 19, 2007, 2:08 pm
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Need help with shorted turn info. I am aware of eddy currents caused
by shorted turns in a transformer or solenoid driven by an A.C.
voltage. Also that a D.C. solenoid can have a metal former as there is
no alternating current to prduce eddy currents.
But I wish to build a solenoid D.C. driven, but switching off & on at
about 3 Hz.  Will a shorted turn ( alluminium former) cause a problem.
(efficiency is very important) All constructive comments welcome.
Davey

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Bob Parker Contact options for registered users 's Avatar (by Gravatar) posted on
December 19, 2007, 2:16 pm
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Re: shorted turns


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    A metal former will slightly slow down the buildup and decay of the
magnetic field. Unless you need the solenoid to snap in and out
extremely quickly, my feeling is that it probably won't be a problem.
    All you can do is build it and see how it behaves...

Bob


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tyuo59 Contact options for registered users 's Avatar (by Gravatar) posted on
December 19, 2007, 9:45 pm
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Thanks Bob,
 I do want the solenoid to act as fast as possible so I will slit the
former to make it open circuit.
Too hard to rewind as it will be 1007 turns of 2.0 mm wire.
Davey

Bob Parker Contact options for registered users 's Avatar (by Gravatar) posted on
December 20, 2007, 1:46 am
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    That's one mean solenoid! Good luck with it. :)

Bob

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