Re: [CAD_CAM_EDM_DRO] Re: Hobby CNC NEW 3AMP Unipolar Chopper Driver Board!

On Saturday 08 May 2004 04:14 pm, caudlet wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Roy J. Tellason"
>
> <rtellason@b...> wrote:
> > On Saturday 08 May 2004 02:06 pm, jess@p... wrote:
> > > Could someone who knows explain -
> > >
> > > What are the advantages and disadvantages of unipolar and bipolar
>
> stepper
>
> > > motors.
> >
> > Here's my understanding of things...
> >
> > Assuming you have a motor that can be wired either way (4 wires,
>
> or 8 coming
>
> > out of it), a unipolar setup will have a *much* simpler drive
>
> circuit, as
>
> > far as needing fewer power semiconductors to make it work, while a
>
> bipolar
>
> > circuit will give you more torque with any given power supply
>
> voltage, but
>
> > requires more complex circuitry.
>
> Unipolar drivers require a center tap connection for the + voltage
> and transistors/FETS switch each leg of the CT coil to ground. 4
> lead motors cannot be used.

You are correct, my oops...