Re: [CAD_CAM_EDM_DRO] Re: Stepper motor wiring-- series or parallel

Mariss Freimanis wrote:

> Hi,
>
> The speed improvement is 2X, not 4X.
>
> Inductance is 1/4 of series value, so inductive reactance is also 1/4
> at a given speed. Inductive urrent increases 4 X, (I = V / (2 pi f
> L)) but there are only half as many turns of wire. This sets the
> parallel ampere-turn advantage to 2 X that of series.

Ahh, you're right! To put it another way, the current rises 4 x as
fast (assuming sufficiently high supply voltage) but it has to rise
to TWICE the current value, which I was forgetting.

Still, a doubling of speed is a worthwhile improvement.

Jon