Re: A little experiment on demagnetization

So, If dismantling a motor for 5 seconds loses 30-50% of the torque,
how do they make these motors in the first place??


-- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:

>
>
> Mariss Freimanis wrote:
>
> >When I don't know for sure, I run an experiment:-)
> >
> >
> <some text snipped>
>
> >4) The baseline motor delivered 18.25W to the dyno at that speed

for

> >a torque of 82.3 in-oz.
> >
> >5) The molested motor delivered 11.75W for a torque of 52.9 in-oz.
> >
> >
> >Conclusions:
> >
> >1) Demagnetization occurs immediately on disassembly.
> >
> >2) The motor loses about 1/3 of its holding torque and and power

as a

> >consequence.
> >
> >
> >
> Well, thanks, Mariss, for setting this one to rest! I'm not sure

your

> numbers apply
> to all motors, but it certainly proves that this is NOT some old

wive's

> tale!
> The effect IS subtle enough that without real instruments a person

might

> think he
> got away with opening one without damaging it, too!
>
> Jon