[SEL] Magneto coil question

[Mark Shulaw]

Hi Jerry,
  A solid steel core will retain magnetism. A laminated core will 
not. This is important because for good induction we need to go from 
zero magnetism to full then back to absolute Zero. If a magnetic 
field remains in a core we do no get that. Its the raising and 
"complete" collapse of the magnetic field that we need to create or 
induce the voltage in the secondary windings.   This is the short and 
sweet of it.    Theres more in the detailed scientific theory but 
that's all we really need to know.    Mark

At 12:00 PM 5/8/2009, you wrote:
>Hi Guys,
>         Can anyone explain to me in simple terms why the steel core 
> of a coil (in this case a flywheel magneto coil) is made up of laminations.
>         Is there a scientific reason for this or is it just easier 
> to manufacture this way.
>         Is there a reason why this could not be a solid steel core 
> (as in a piece of steel laser cut to the right shape/size) ?
>         Many thanks for any explanations.
>
>Keep the revs up (or down)
>Jerry Evans
>Near Johannesburg in Sunny South Africa.
>Etched Brass Engine Plates made to order:
><www.oldengine.org/members/evans/plates/index.htm>
>
>
>
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Mark Shulaw
454 Co. Rd. 33
Bluffton, OH. 45817  USA

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