disassembling steppers was Re: re:Re: My CNC Project

Hi,

Taking a step motor apart is a bad thing. The motor is ruined if the
rotor is slipped out even for a second. It demagnetizes the rotor,
causing inductance to fall into the low hundred microhenry range. The
motor will now destroy PWM drives.

The rotor to stator airgap is on the order of .003" and the rotor
magnet is very powerful. It will gladly pick up the tiniest steel
chip and drive it into said airgap, locking the rotor. These chips
are impossible to remove without taking the motor apart, ruining the
motor (catch 22).

Mariss

> To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
> Date: Sunday, January 07, 2001 1:33 AM
> Subject: [CAD_CAM_EDM_DRO] re: disassembling steppers was Re:

re:Re: My CNC

> Project
>
>
> >Rich,
> >
> >You MAY be lucky! I hope so! But I want to again Warn the list.
> >Taking apart a stepper motor is not generally a good idea. In
> >addition to the possibility of ruining, or drastically reducing
> >torque output of the stepper, there is the issue of thermal
> >expansion. Steppers get hot! If you have taken out the ability to
> >deal with this, you may have intermittant, hard to trace problems.
> >
> >Hope this helps.
> >
> >Ballendo