Re: Half Coil

The nameplate is typically for unipolar operation when on a 6 wire.
That means, center lead to one end for full amps.

when you go end to end you increase the inductance and lower your
amps.

The nameplate rating is for a single coil.

Dave

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Tony Jeffree <tony@j...>
wrote:

> At 13:55 19/03/2003 -0800, you wrote:
> >Reading past posts on running steppers in 'Half Coil'

configuration has

> >left me a little confused.
> >If configured in 'Half Coil' can the amps be doubled? Run at 1.414

times

> >rated? Name plate amp rating never exceeded?
> >
> >I have PacSci PowerMax II motors rated 0.82 amp., Max Vdc = 65, 31

watts.

> >Currently setup on 24 volts, 0.75amps, 1/8 step with Xylotex
> >driver. Would like a little more power output.
> >PJH
>
> The current cannot be doubled. If you are using 8-wire motors, then

you can

> wire the coils in parallel; in this configuration, you may be able

to get

> away with a multiplier of 1.414, but this will depend greatly on

the

> characteristics of the motor. If they are 6-wire motors, then do

not exceed

> the name plate amp rating.
>
> The point about the parallel config is that it halves the winding
> resistance; you can therefore increase the current by 1.414 and

still get

> the same resistive heating in the coils. However, as Mariss will

tell you,

> this may result in the microstepping becoming significantly less

linear,

> due to magnetic saturation effects, so it may result in the motors

running

> much less smoothly than they do at the name plate amp rating.
>
>
> Regards,
> Tony