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

If the magnets are of the rare-earth "super" variety (neodynium,
boron etc) they absolutly do not need a keeper. I have purchased
several hundred of these magnets of various shapes & sizes a couple
of years ago and they were never shipped with keepers, nor did the
vendor advise using them. Older, iron-nickle magnets do need a
keeper. BTW, it is impossible to remagnetize a rare-earth magnet
without a collossal piece of equipment, which would propably dim the
lights of a small town.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jim Register
<jtregister@...> wrote:

>
> Yahoo wrote:
> > I figured it was something like that. I suppose if you had an

iron plug the

> > same size as the rotor you could slide it in as you remove the

rotor and

> > maybe not ruin the motor.
> > --
> > Phil Mattison
>
> The rotor is the permanent magnet; you'd need an iron/steel tube

to

> slide it into, I think.
>
> Jim Register
>