Re: [CAD_CAM_EDM_DRO] Re: Why do stepper motors lose their magnetism when disassembled? and a dc treadmill motor ?

So, guys, what about a bog-std treadmill motor ?
Can they be taken apart, or not.
Permannet magnet DC motor, surplus center, 130 V DC.

I was advised yes, I am just checking.
I need to take out the rotating piece to work on it, thats why.
So far, I´ve just taken out the back end with the brushes.



Alan Rothenbush wrote:

>
> > Seems odd that they would demagnetize so easily. Can't argue
> > with fact but I have successfully taken a stepper apart and
> > am currently using it without any noticeable degradation (I
> > have two other identical motors in the machine so comparison
> > is easy).
>
> I'll happily swap you for one of mine taken apart in a moment of
> curiosity. It still steps, but with NOTICEABLY less torque and
> gets CONSIDERABLY hotter doing it.
>
> I'll also throw in an old mag chuck (eBay madness) that was SEIZED
> solid in the "on" position. A week in a bucket of solvent didn't
> help, so apart it came. Cleaned the solidified .. grease, I assume ..
> lubed a bit, reassembled and it's now permanently in the "off"
> position.
>
> Apparently, everyone except me knew this would be the result, for the
> same reason steppers fail when disassembled .. something about breaking
> the magnetic field.
>
> Alan
>
>
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