Re: [CAD_CAM_EDM_DRO] Re: dc spindle motor control.

jeff35m_73068 wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
>
>>jeff35m_73068 wrote:
>>ty jon. that helps alot. I new the shunt motor would make more
>>
>>
>torque. I did connect it that way first; the motor did not seem to
>like that connection, and there was a small amount of smoke coming
>from the brush area of the motor. Do you think a reostat would fix
>it? I will try to find the label that was in the wiring cabnet. There
>were a couple other wires which i figured were temp sensors. I will
>also take a pick which may help.
>
>

Hmm. A bit of smoke from the brushes may not be unusual for a motor
that has been idle for several years. It should stop after the motor has
spun up for a few seconds, though. If you didn't get enough field
excitation,
then smoking and no/poor motor performance may be normal. It is common
for shunt motors to use anywhere from 50 to 180 V for field excitation.
You can tell a shunt field motor because the field winding will have tens of
Ohms resistance.

Jon