[harishmech10]

I have old yaskawa spindle servo motor , I need to mount new VFD and run the spindle. Turning center FANUC control. Thanks in advance. Any suggestions guys.

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[joeavaerage]

Hi,
to get the best out of a servo you need a servo drive not a VFD.

If you get a VFD with sensorless vector control it will run a servo adequately but note that you'll get only a 10:1 to maybe 50:1 speed
range. A genuine servo drive you'll get 5000:1 easy.

Craig

[harishmech10]

Hi,

Thanks for reply

Yaskawa spindle Drive : CIMR-VMW2015-SVC.

Yaskawa spindle motor : UAASKB-15CA3.

This is drive and model no. Somebody saying this motor is not servo.

And some people's using teco drive they're running the spindle. I'm getting confused.

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[joeavaerage]

Hi,
from the pictures that looks more like an asynchronus spindle motor rather than a servo.

AC servos have permanent magnet rotors and are therefore synchronous and usually have an encoder that allows for position control, ie have an index
signal. Also they have commutation signals for the drive.

Depending on the source of the description some decribe the attached Yaskawa encoder not having an index output and therefore not position
capable, neither do any of the descriptions make any mention of commutation signals, which tends to lend credence to the notion that this is an
asychronous inverter-ready spindle. That being the case any suitably sized VFD will work.

Craig

[joeavaerage]

Hi,
one test that you might do to establish whether it has a permanent magnet rotor is with it sitting on the bench, dissconected from
all power, short two windings together and turn by hand. If it has a permanent magnetic rotor it will attempt to generate high currents in
the short and there will be extreme resistance to turning. If however the rotor is not magnetic then there will be very little or no resistance to
turning the shaft by hand.

Craig

[harishmech10]

Thanks for suggestions.

Due to covid 19 we're unable to go outside. I'll check and reply.


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