Re: [CAD_CAM_EDM_DRO] Question about Servo Drives

John Dammeyer wrote:

> Ah. To answer my own question, http://www.bdmicro.com/rx50/rx50.pdf
> has a write-up on the difference between locked antiphase verses
> sign-magnitude control. I assume locked antiphase is the same as
> synchronous-antiphase?
>

Yes.

> I had no idea there were so many differences in H-Bridge DC Servo motor
> control.

There are still other schemes, too, like phase shifting, where
both half bridges switch at the PWM frequency, but the timing
between them changes. I built on of these, but it was a
nightmare, all analog control of the timing, many years ago.

Jon