2.2kW vs. 5.5kW Servo Spindle Motor on 3 Phase 220V AC

P. Lynch

Total Posts: 2

Posted: 9 days ago

#313 Quote

Hi everyone! I have a question about using 2.2kW servo spindle motor or 5.5kW servo spindle motor with their controllers on 3-phase 220V AC power in the USA. The specs say the spindle runs at 1460 RPM with a max of 6000 RPM. How do I figure out the duty cycle at different RPMs?

For example, if it’s 100% duty at 1460 RPM, how long can I safely run the motor at 4000 RPM for a long milling operation? Also, does anyone know what the torque is like at lower RPMs? Is there a chart or any documentation available for these motors?

Thank you so much!

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ATO

Total Posts: 113

Posted: 9 days ago

#314 Quote

P. Lynch wrote:

Hi everyone! I have a question about using 2.2kW servo spindle motor or 5.5kW servo spindle motor with their controllers on 3-phase 220V AC power in the USA. The specs say the spindle runs at 1460 RPM with a max of 6000 RPM. How do I figure out the duty cycle at different RPMs?

For example, if it’s 100% duty at 1460 RPM, how long can I safely run the motor at 4000 RPM for a long milling operation? Also, does anyone know what the torque is like at lower RPMs? Is there a chart or any documentation available for these motors?

Thank you so much!

Hi, P. Lynch!
For both 2.2kW and 5.5kW servo spindle motors, we recommend avoiding extended operation at 4000 RPM. At higher speeds, the torque output decreases significantly and might not be sufficient for your load. Unfortunately, we do not provide detailed torque curve graphs for these motors. However, operating the motor at around 1500 RPM is perfectly fine for continuous use without issues.

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ATO.com

Mat Gilbert

Total Posts: 1

Posted: 9 days ago

#315 Quote

ATO wrote:

Hi everyone! I have a question about using 2.2kW servo spindle motor or 5.5kW servo spindle motor with their controllers on 3-phase 220V AC power in the USA. The specs say the spindle runs at 1460 RPM with a max of 6000 RPM. How do I figure out the duty cycle at different RPMs?

For example, if it’s 100% duty at 1460 RPM, how long can I safely run the motor at 4000 RPM for a long milling operation? Also, does anyone know what the torque is like at lower RPMs? Is there a chart or any documentation available for these motors?

Thank you so much!
Hi, P. Lynch!
For both 2.2kW and 5.5kW servo spindle motors, we recommend avoiding extended operation at 4000 RPM. At higher speeds, the torque output decreases significantly and might not be sufficient for your load. Unfortunately, we do not provide detailed torque curve graphs for these motors. However, operating the motor at around 1500 RPM is perfectly fine for continuous use without issues.

I've worked with the 2.2kW servo spindle motor, and I agree with ATO's advice. Running it at 4000 RPM for long periods will stress the motor, potentially causing overheating and reduced torque. If your milling requires sustained high RPM, you might want to consider the 5.5kW servo spindle motor instead. It has a bit more headroom for torque, even at higher speeds, though I'd still recommend monitoring the temperature closely.

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Danwood

Total Posts: 1

Posted: 9 days ago

#316 Quote

P. Lynch wrote:

Hi everyone! I have a question about using 2.2kW servo spindle motor or 5.5kW servo spindle motor with their controllers on 3-phase 220V AC power in the USA. The specs say the spindle runs at 1460 RPM with a max of 6000 RPM. How do I figure out the duty cycle at different RPMs?

For example, if it’s 100% duty at 1460 RPM, how long can I safely run the motor at 4000 RPM for a long milling operation? Also, does anyone know what the torque is like at lower RPMs? Is there a chart or any documentation available for these motors?

Thank you so much!

From my experience with servo spindle motors, the key to managing higher RPMs is proper cooling. I used a 5.5KW motor for a similar application, and adding an external cooling fan helped maintain performance during extended runs at 4000 RPM. As for torque, indeed, most manufacturers don’t provide torque curves, but a rough estimate is that torque drops proportionally as speed increases beyond the rated RPM.

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P. Lynch

Total Posts: 2

Posted: 9 days ago

#317 Quote

Thanks for all the insights! It looks like I’ll need to rethink running at 4000 RPM for long periods. I’ll consider additional cooling solutions and maybe upgrade to the 5.5kW motor if needed. Appreciate all the tips!

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