Re: [CAD_CAM_EDM_DRO] Re: trouble shooting steppers

In a message dated 15-Nov-01 20:17:22 Central Standard Time,
indigo_red@... writes:

> A friend if mine gave me a good idea for
> comparison testing of stepper windings, Just place a 1K load
> across the coils and put scope probes across them, then spin
> the shaft and see if the amplitudes generated are similar. Simple.
> Seemed reasonable. I'll have to test this out and see.
>

That would work, because steppers "generate" strong DC pulses when manually
turned. You can illustrate this to yourself with NO other equipment: Make
sure all-four (or six) wires are separated, and then turn the shaft with your
fingers. Note the "resistance" to turn it. THEN, twist all-four (or six)
wire-ends together, and repeat the spinning. Notice how much HARDER it is to
turn the shaft, now! This, into a 1K resistor, should be at least several
volts per phase!


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