Current turning capabilities status

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emcPT wrote: The motor is AC for sure. There are 3 thick wires marked as U V W.

That tells us that it is three-phase.
It could still be a 3-phase permanent-magnet motor (variously called PMAC, BLDC, AC Servo, Synchronous AC) or it could indeed be a simple 3-phase induction motor.
Are there any other wires from the motor to the drive?
There are drives that can control almost any motor type, the CT Unidrive, for example:

But as you can see, they are not at all cheap.

Now, the issue is that the motor plate informs:
170V 98A
I believe that the 98A are at full 15Kw peak power, that the motor plate also informs.
I think that VFD drives are build to work at 400VAC or 220VAC, so I have no idea how to obtain the 170VAC needed.

I _think_ that most motors are OK at higher than nameplate voltage as long as the current is suitably limited by the drive.

isn't 170 about what you get when you rectify 120volts ac with a full wave bridge?

The motor is also responsible for moving the C axis, so maybe AC servo. I think that it must have a lot of torque at very low speeds. I must say that I never saw the machine working.
I have no idea and I also do not know how can I figure it out. Never less I think I cannot buy such a servo drive (almost 100A) to test it. I simply have no means to do such an insane thing (€ $)

My simple approach was to take out the motor and do not use the C axis. But of course using the main already mounted motor would make the machine much better.

From the electrical schematic there are 6 wires that are leaving the motor. The wires are for connecting the Y or delta, to achieve two range speeds (commuted by either KMMSH and KMMSL (high and low)), for this reason I think it is a "standard induction motor", as those 6 wires can be compared as the connection box of a standard induction motor but my knowledge on this matter is low. I have attached a picture from the schematic. Previous, when I was trying to use all the hardware I posted in CNCzone, but I had no clear reply about what motor is it or if I could control it. Most reply's were negative.


Thank you

And here it is the built in splindle. Not showing the actual machine but it is from another sister machine (a bit more modern) that we are cleaning.
At 5000rpm almost no vibration, it is quite amazing. It is also oil cooled for tight dimension work.

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emcPT wrote: From the electrical schematic there are 6 wires that are leaving the motor. The wires are for connecting the Y or delta, to achieve two range speeds (commuted by either KMMSH and KMMSL (high and low)), for this reason I think it is a "standard induction motor",

That does seem likely, looking at the diagram.
One way to tell might be to connect a low current supply to two of the wires (say 1A between U and V) and see if you can feel any "notches" as you rotate the motor.
I don't think you will feel any with an induction motor, whereas you will with a permanent magnet motor.

Does the rest of the wiring diagram show any more wires from the motor/spindle to the drive? If the only other wires from the spindle are an incremental encoder then I think it probably is just an induction motor.

This does mean that just about any VFD will work.

I am wondering if it might be worth trying to fix:


I have no idea how important the missing parts are.

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andypugh wrote: I am wondering if it might be worth trying to fix:
.

Forget that, I miss-read the power.
For your spindle you would need:
www.motorcontrolwarehouse.co.uk/unidrive-sp2403/prod_328.html
The reason I suggest these drives is that they can control an induction motor in closed-loop using an encoder. This ought to give you a working C axis.

For rather less money, but rather more of a gamble, there is: