Re: [CAD_CAM_EDM_DRO] Steper motor wiring

In a message dated 12/30/2004 10:39:50 AM Central Standard Time,
rob.will@... writes:

If I try to determine coil terminals by connecting 12v car battery
(negitive) to a stepper terminal and touching other stepper terminals with the
positive, WILL I HARM THE MOTOR??


Probably! I suspect that stepper has a 5 V or lower coil-voltage, and 12 V
from such a low-impedance source (car battery) will send TENS of amps through
the coils!! Do that ONLY with a 10 ohm/50 W. resistor in series with that
DC source. The motor will seem to "lock up" when you apply the DC, and you
would have to have a pair of SPDT switches to make it step (or a proper
unipolar driver).


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