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

I don't understand. Keepers are there to prevent demagnetization that
takes months or years... and the modern materials like neodymium do not
self-demagnetize like the old stuff.

Danny

wotisname wrote:

> Hi,
>
> The reason is very simple. Magnets need a keeper plate to stay
> magnetized, some magnets loose their magnetism quicker than others
> dependent on the material they are made from. When you open a stepper
> motor you destroy the keeper which in this case is the motor armature
> and casing and half the magnetium effectively escapes, a bit like
> letting the smoke out of electronic components when you blow them up:-)
>
> Regards, Terry
>
>