Re: [CAD_CAM_EDM_DRO] Can I use a Brushless motor on a VFD inverter?

Ian Phillips wrote:

>I have a Reliance Electric Servomotor which is described as 'Brushless' it is in fact a 3 phase (240V) motor with a permanent magnet rotor. There are 3 connections to the windings intended to be driven by a servo drive unit. I would like to know if this motor could be used as a spindle motor by connecting it to an inverter intended to drive a 3 phase induction motor (as long as voltages and ratings are suitable)
>
>

As far as I know, no. Most VFD's are designed for induction motors,
where the magnetization
from the stator excites magnetic poles in the rotor. It is possible
that some VFD's might work
with a VFD, but I would be moderately surprised.

What you need is a brushless servo motor drive. this may be very
similar to a VFD in many
ways, but the firmware and/or control circuits are pretty different.
Almost all brushless
servo drives require an encoder or sensor to give the proper commutation
of the windings.

Jon