Re: Why do stepper motors lose their magnetism when disassembled?

A little searching on the web for "BH curves" will find lots of
information on magnetic materials. For example, http://www.shinetsu-
rare-earth-magnet.jp/e/design/ gives a pretty good discussion on the
properties of rare earth magnets. Other materials have very
different demagnetization properties, as others have mentioned.
1st year college physics covers a little of this stuff. I can
remember the curves for hard and soft iron.
Guess that shows how long ago it was.

Elliot

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "William Bright"
<wbbright@...> wrote:

>
> If I remember correctly the same thing happens on old magneto's . I
> have an old magneto magnetizer and if I remember correctly after
> charging there is a metal clip that is used to keep the path closed
> until it is back in the casing. Read up on magnetos and the

reasoning

> should be listed. Its been years since I read about it.
>