Picked up AC servomotor surplus, need drive advice

[escott76]

Title says most of it. I picked up a Mavilor AC servo motor at a surplus store yesterday. From what I can gather it will work well as a spindle motor in my small benchtop mill project. There were cables attached to the motor.
The model looks like a BLT-72 Info on the tag as follows :

Ref. BT072A.90.0099.G6
Type BLT-72
Stall Torque 1.9
Peak Torque 7.6
Max RPM 11,000
Hall Encoder M21-2000/8

So now I'm trying to figure out the right option for use as a spindle drive. I'm using Mach 3, and I'm not really interested in crazy absolute positioning for tapping or anything. I don't really want to use the step/dir type of setup, as I think that would limit my top RPM (not sure on this, but I run mach at 35k kernel, I think it wouldn't be able to keep up with the pulses at top RPM), and I've got a handy 0-10 out already in my setup.
I would prefer to keep things at the 110-115v AC input, and I think I've found a couple of drives that will work, but I'm in a little over my head here. The other thing that I can't seem to figure out is if I could use something as simple as a VFD for drive. That would definitely make things cheaper, but the only brushless motors I'm really familiar with their operation and theory are permanent magnet brushless motors, which I'm pretty sure that this is not.
Any advice or pointers out there?

[Al_The_Man]

If it has a hall encoder, it is most likely a BLDC, probably the 2000/8 is 2000p/rev and 8 pole motor.
S.T. 1.9 this is Nm?
You could look at Advanced Motion Controls for a drive, they come up on Ebay pretty regularly.
Al.

[escott76]

Originally Posted by Al_The_Man If it has a hall encoder, it is most likely a BLDC, probably the 2000/8 is 2000p/rev and 8 pole motor. S.T. 1.9 this is Nm? You could look at Advanced Motion Controls for a drive, they come up on Ebay pretty regularly. Al.

According to this http://www.mavilor.es/products.asp?cuerpo=p07 and the linked PDF http://www.mavilor.es/pdf_products/bl40_series.pdfthese are described as AC servo motors. Is there something that explains the difference (if any) between a BLDC and an AC servo motor? As I said the brushless motors I have experience with use permanent magnets, and three wires. The "power" side of the wires seem to have 4 wires.

[Al_The_Man]

The differences between AC sinusoidal and BLDC is in the commutation and the drive, they both have three stator windings with P.M. rotor.
The fourth connection you see may be the ground connection.
The AC type generally uses resolver feedback, and the BLDC hall effect.
AC controlled is by true three phase sine wave, with BLDC only two windings are energised at any one time, hence Brushless DC, see
http://users.tinyworld.co.uk/flecc/4...otor031102.swf
Al.

[escott76]

Originally Posted by Al_The_Man The differences between AC sinusoidal and BLDC is in the commutation and the drive, they both have three stator windings with P.M. rotor. The fourth connection you see may be the ground connection. The AC type generally uses resolver feedback, and the BLDC hall effect. AC controlled is by true three phase sine wave, with BLDC only two windings are energised at any one time, hence Brushless DC, see http://users.tinyworld.co.uk/flecc/4...otor031102.swf Al.

So theoretically would a hobby controller (model airplane/helicopter) work to make these spin? Because the diagram you showed me looks exactly like the diagram of a hobby brushless that I am familiar with. Aside from pole count and voltage, I don't see why it wouldn't spin things. I suppose I also don't then see why I couldn't use a VFD, or is a VFD for sinusoidal motors?

[Al_The_Man]

I have never had success with PM servo on a VFD, they are primarily designed for induction motors.
I am not familiar with the hobby controllers, but if they allow for the commutation feedback, it may work?
Al.