Re: [CAD_CAM_EDM_DRO] Re: AC drives

I think they're referred to as 'written pole' motors.
You're virtually 'writing' every pole with a pulse of
current.

RayHex

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> From: gittt2000 <gitlang@...>
>
>
>
> I've been confused between DC Brushless and AC

synchronous Servo

> motors and thought I'd sorted this out, but now I'm

confused again.

>
> The MAC AC Servo motors by Indramat (now Bosch Rexroth)

are described

> as synchronous but they are not similar to ordinary ac

induction

> motors. They have a wound stator, electronic commutation,

and a rotor

> comprised of 6 (or another multiple of 3 presumably)

permanent

> magnets, rather than the squirrel cage of conductors

which form the

> normal induction motor rotor. As far as I can see there

is no

> induction involved - the stator produces a rotating

magnetic field

> and the magnetic rotor follows it. What makes it

synchronous is the

> commutation which signals the servo drive to supply the

correctly

> phased stator drive.
>
> How would you describe that type of motor?