What motor to use for lathe spindle?

[martyscncgarage]

The drive Marty recommended from AD.
Sensorless vector control with autotune
Sensorless vector control with optional
encoder feedback card, for tighter speed
control.

I have this drive sitting on the shelf new in the box.
It is Sensorless vector as well but I don't think it has the option for encoder feed back.
https://www.driveswarehouse.com/wj200-022sf

If others are threading with induction motors and a VFD with the encoder reporting only to acorn why would I need the drive to have encoder feedback?
Thanks for explaining the PM vs induction motor difference.

I agree that your Hitachi should also work.
Marty

[martyscncgarage]

I seen you using the Huanyang drives on YouTube. It had me thinking why you didn't recommend one of those.
I opened and saved the AD link you posted. I haven't looked into that drive.
If the guy I contacted at CTB can't get me the correct manual and password to configure the CTB drive I will move forward with a stranded VFD.

Let's talk about encoders now. The motor has one and the machine has one.
This link breaks down the motor part#. The table is at the bottom of the page. The encoder on my motor is code G.
Can I use the encoder that is in the motor?
http://www.ctbservo.com/Products/delita ... vs=&id=121

This is the encoder that is belted to the machine spindle. Will this one work?
IMG_6434.jpg IMG_6433.jpg

Sorry, so many posts it got hard for me to keep track of. I agree with Dave_C. I would hook up the encoder to a DB9 connector (DB9 Male breakout boards work great for testing because of the ease of connection). The Just cross the color code over to the ACORN DB9 connections on the Centroid Acorn Schematic and give it a try. You can go into F1, F3 Config, 137, then F4 PID and manually rotate the encoder and watch #5. You should see the encoder counts go up and down as you turn the shaft.


Marty

[mick41zxr]

TRM another option to consider may be to contact CTB & get a price for a replacement driver that is unlocked.
May not be far off a VFD.
Regards,
Michael

[TRM]

Got the spindle motor issue under control and here is a video of my progress.
https://www.youtube.com/watch?v=hq19_wp9-y0

There is some good info in this video that may help someone chasing issues.
I'm going to use a noise filter and ferrites on my setup.
https://www.youtube.com/watch?v=DJfiOqaeFDg

[martyscncgarage]

Nice work!
Now you can plow forward! Keep us posted on your progress.
Marty

[TRM]

The next part on my radar is the encoder. I hope the one on the machine will work.

[mick41zxr]

You will still have one on the back of the spindle motor as you have gone sensorless vector with the VFD.

[TRM]

You will still have one on the back of the spindle motor as you have gone sensorless vector with the VFD.

https://www.youtube.com/watch?v=AcHRMCEg9SE&t=2s

[thermo44]

Is use a Clearpath Integrated Servo motor. Step and Direction. Can Acorn use this motor as a spindle motor and thread?

TRM,

Acorn can not use step and direction for spindle control!

Acorn outputs 0-10vdc control for motor speed and uses relays to initiate start and stop of a VFD for spindle control.

Dave C.

Hello Dave C. I have a Question about that! I have a 3HP induction motor for my knee mill. I've bought a 2.2kw VFD for that motor. This VFD has 0-10vdc But I was wondering if this type of motor can be used for ridgid tapping. The other motors are AC servos that accept position control mode. So step / direction is included, I have bought an Acorn, Thanks in advance!

[martyscncgarage]

3 phase motor, VFD with brake, Line driver differential encoder belted to the spindle at 1:1 with a timing belt is typical.
I have heard of guys using a servo motor belted to the spindle at 1:1 WITH a timing belt. Not seen anyone explain their servo settings/setup, or been pointed to a video showing this being successfully done and used yet.

Servos have PID settings that need to be tweaked given the application.

Marty