Suitable Cap for Gecko's was Re: 8-wire 1/2coil stepper?

Keongsan,

Unfortunately you can't tell much by measuring voltage on the motor
phase outputs on a PWM full bridge drive, not even with a scope.

All the neat action is on the current sense resistors, but you need a
scope to see it. There, with a scope, you can easily see every
microstep and most everything else on how well the drive is
performing. It is the single most useful test point.

Mariss

--- In CAD_CAM_EDM_DRO@y..., "keongsan" <keongsan@y...> wrote:
> --- In CAD_CAM_EDM_DRO@y..., "mariss92705" <mariss92705@y...> wrote:
> > Alan,
> >
> > Good afternoon! A full step sequence is where A and B are the
> > windings, + and - is the "direction" of the current thru the
> winding.
> >
> > +A +B, +A -B, -A -B, -A +B
>
> When one is checking why a motor didn't turn, one can measure the
> phase voltages while jogging one step at a time, which for full-
step
> I think would be:
>
> +Vm +Vm -Vm -Vm ....... (haven't tried)
>
> and for half-stepping would be:
>
> +Vm + Vm +Vm 0 -Vm -Vm -Vm 0 ........ (tried)
>
> so one then would know the driver board is stepping correctly
>
> With a microstepping driver like the Gecko, how would the phase
> voltage go by jogging 1 step at a time?
>
> Thanks
>
> keongsan