Re: fickle y-axis

Peter,

The half-step sequence repeats after 8 half-steps (0-,+-,+0,++,0+,-+,-
0,--). Still 50 repetitions within one full revolution (400 / 8 = 50).

Half-stepping can be considered a 2 microstep per step drive. If you
graph out the above sequence, it will have a passing resemblence to a
sine-cosine function.

Mariss

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "forumtvm" <forumtvm@y...>
wrote:

> Hi Mariss,
>
> I am not as knowledgable about steppers as you, but with all due
> respect, is not the sequence you described for a half stepping

motor?

> In fact, I am using a 200 steps motor and half-stepping, so that
> would make it a 400 steps motor, that is, it should have 100 poles
> per phase?
>
> Regards
>
> Peter
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mariss Freimanis"
> <mariss92705@y...> wrote:
> > Peter,
> >
> > A 200 step per revolution motor is in fact a 50 pole motor. The
> full-
> > step sequence (00, 01, 11, 10) takes four full steps before it
> > repeats. It repeats 50 times (for 50 poles) to make one

revolution.

> >
> > Mariss
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "forumtvm"

<forumtvm@y...>

> > wrote:
> > > Hi,
> > >
> > > Just one small question. In a stepper motor with 100 poles for
> > phase
> > > A and 100 poles for phase B, when say phase A is activated,

does

> > all
> > > the 100 poles get magnetised. I suspect this is the key I need

to

> > > grasp before I get to understand why my y-axis got to behave so
> > > erratically when one wire got loose/disconnected.
> > >
> > > Peter