Re: AC drives

--- In CAD_CAM_EDM_DRO@y..., "Peter Seddon" <peter@s...> wrote:

> AC servo and DC brushless motors are I believe one and the same

for all

> intents and purposes.

That's the only conclusion I can come to.

> With permanent magnets on the rotor (ie your ac servo motor) the
> rotor flux is permanently established.

Yes, and being smaller diamter, lighter and longer means it's much
lower inertia. Also means that if you drive the input shaft with no
power to the stator, then it generates, so making it easy to adjust
the commutation timing without phase shift inducing currents and
losses to allow for.