Re: Stepper Dissasembly

Please elaborate on how damaged motors 'murder drives'?
Do they generate excessive back EMF or something?

My limited experience with small chopper drives is that they don't
seem to care if you short the outputs... they just produce very short
chopping pulses.

As for why it was in the trash, academics throw out lots of stuff,
especially when their lab space is being renovated. So it is an open
question... I got a lot of goodies from that lab though.

thanks,

Chris

-- In CAD_CAM_EDM_DRO@y..., mariss92705@y... wrote:

> Hi,
>
> Option (1) is my choice.
>
> If the rotor has been removed, it is probably de-magnetized and it
> will murder drives. Also it is tough to tell if it has a shorted

turn

> in the winding. The givaway is increased detent torque over a good
> motor. This will also make it a serial killer of drives. It probably
> was in the trash for a reason:)
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@y..., Chris Stratton <stratton@m...> wrote:
> > I've got another size-34 stepper from the trash at MIT, this one
> > without a backplate on it. Electrically it is fine. So I

machined

> up
> > a replacement backplate, however the rotor binds in some

positions.

> >
> > Should I:
> >
> > 1) use it as a paperweight
> > 2) make another backplate with some means of centering the bearing
> > 3) pull out the rotor (possibly weakening magnets?), clean, and
> maybe
> > take a very light cut on it in the lathe?
> >
> > I realize neither 2 or 3 is going to yield a great motor, question
> is
> > if it will yield something more than a paperweight.
> >
> > Chris
> >
> > --
> > Christopher C. Stratton, stratton@m...
> > Instrument Maker, Horn Player & Engineer
> > 22 Adrian Street, Somerville, MA 02143
> > http://www.mdc.net/~stratton
> > NEW PHONE NUMBER: (617) 628-1062 home, 253-2606 MIT