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CNC servo motor sizing

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xzswq21:
Hello
I want to buy a F1210 milling machine from WABECO.
https://www.wabeco-remscheid.de/cnc%20milling%20machine%20cc-f1210%20basic%20-1889.html
the specification of the original stepper motor is as following:

NEMA 34
Bipolar current: 6 A
Bipolar holding torque: 3 N.m
Rotor inertia: 1450 kg.m2.10e-7
Theoretical acceleration: 20600 rad/sec2


Ball screw pitch is 5mm
Stepper angle is 1.8 Degree
travel speed X-axis and Y-axis: 30 - 600 mm/min
travel speed Z-axis: 30 - 400 mm/min

But I want to use ClearPath SDSK servo motors:
https://teknic.com/products/clearpath-brushless-dc-servo-motors/all-clearpath-models/

which one is suitable for the Machine according to the above specification?

Thanks

Juha:
Typically you would size your motor based on mechanics. So based on the load and the speed/acceleration you want you select a motor that can achieve it. Then you would also try to match inertia etc.

Assuming the mfgt has chosen the stepper motor based on actual calculations (I doubt) then if example speed doesnt matter just pick something with the same torque.

Teknic_Servo:
Hi xzswq21,

I'm an applications engineer with Teknic.

It looks like another forum member has already touched on this point but, in general, there are two ways to properly size a servo motor:

1. Size the motor based off of an existing motor/motor specifications (such as matching the motor based on its torque and speed output) 2. Doing an in-depth machine analysis where you would calculate moving masses and motion requirements to then come up with inertia, torque, and speed numbers.

In either case, please feel free to reach out to us directly for support.  You can give us a call at 585-784-7454 or send in a contact request here: https://www.teknic.com/contact/

Best regards,

Mark D. - Teknic Servo Systems Engineer

xzswq21:
Can I connect Three or four SDSK-3421S motors at the output of Teknik PowerHub?
Do you have any details about the PowerHub? How much power can the PowerHub deliver to the outputs?
https://teknic.com/POWER4-HUB/

thm_w:

--- Quote from: xzswq21 on October 28, 2021, 05:53:32 pm ---Can I connect Three or four SDSK-3421S motors at the output of Teknik PowerHub?
Do you have any details about the PowerHub? How much power can the PowerHub deliver to the outputs?
https://teknic.com/POWER4-HUB/

--- End quote ---

Its right in the datasheet: https://www.teknic.com/files/downloads/Clearpath-SC%20User%20Manual.pdf


--- Quote ---USING THE POWER4-HUB
The Power Hub (Teknic PN POWER4-HUB) is an optional ClearPath accessory board that:
1.  Distributes DC bus power to as many as four ClearPath motors per Power Hub, thus eliminating the need for special "power chaining" cables.
2.  Delivers low voltage logic power backup to your ClearPath motors. Logic power backup keeps the motors' electronics "alive" even if DC bus power is dropped. This translates to uninterrupted communication, continuous status monitoring, and retention of encoder position.

Note: You will be unable to spin your motors when using only logic power backup. Logic power backup will keep the motor electronics alive, but is not designed to run motors.
--- End quote ---

I have some older Teknic stuff and its great.

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