Re: What variable speed motor to use?

You can also have optional encoder feedback in VDF and then cnc
control can handle AC motor spidle as it would be servo.
One taiwan machinetool manufacturer use 15hp AC spindle motor whit
Yaskawa varispeed G6 inverter and encoder/optional encoder card
and this machine have rigid tapping function whit this setup.
Personaly I have use 0,55kW 3 phase AC motor and mitsubishi A500
series inverter as milling machine axis motor.

> Gerald <Area51tats@a...> wrote:

> Ok, there are two different strategies going on in this discussion:
>
> #1- One is to take an AC motor, stick a VFD (variable frequency

drive)

> electronics box on it, and there ya go, a manually knob

adjustable

> rpm motor. Just great for a mill, or for a manual lathe.
>
> #2- The other (more expensive, but very useful, and very

applicative to

> lathes)
> situation is to replace the AC motor with a DC
> motor/encoder/servodrive
> combo and put the rpm (and indeed the exact spindle position)

under

> control of the PC.
>