Holding torque describes a stated stationary condition, not every running speed.
Keep the operating condition with torque
Oriental Motor defines holding torque for a powered motor at rest and separately presents speed–torque characteristics. Preserve those different conditions. Primary reference: Oriental Motor stepper specifications.
Identify the actual motor, driver and relevant operating basis for any running curve. A stationary torque value does not supply the complete torque available during motion. The required acceleration and load conditions should remain visible beside the running-speed requirement.
A hypothetical curve-reading question
Imagine a fictional offer highlighting 2 N·m holding torque while the application requires a defined torque at 800 rpm. The offer gives no applicable curve at that operating point. Enter the stationary value in its proper field and ask for running evidence; do not assume the same 2 N·m is available at 800 rpm.
Make columns for holding condition, running speed, required torque, applicable curve and driver identity. The numbers are invented labels, not an HM drive rating or a reproduced manufacturer curve. They establish no acceptable operating point or selected motor.
Compare the actual motion demand
Ask how the documented running and acceleration demands relate to the complete motor/driver operating envelope. The fact that the motor can hold a load at rest does not answer how the proposed system reaches and maintains its commanded movement.
When a driver, supply condition or speed schedule changes, keep that difference in the application review. This guide helps reconcile a catalog holding figure with a real motion question without prescribing a universal stepper speed, inventing a pull-out curve or claiming that one stationary rating proves the proposed dynamic duty will be achieved.
Customer Questions
Is holding torque a universal running torque?
No. Use the relevant speed–torque and operating-condition evidence.
Why identify the driver?
The documented motor/driver basis belongs with the curve.
Does the 2 N·m example select a motor?
No. It identifies a missing running-condition comparison.
Primary References
These references support the technical principles discussed in this guide. The worked examples and review questions are educational.
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