How to Obtain the Torque Curve for a Vacuum Motor?
Before discussing the torque curve, let's briefly outline the differences between a vacuum stepper motor and its non-vacuum counterpart.
Using this motor as an example:
If a vacuum version of the same motor is required, for instance, needing SHT grade, the customization process for vacuum involves only changing the internal lubricant used and employing materials with low vapor pressure and low outgassing rates, such as stainless steel, oxygen-free copper, special ceramics, vacuum-compatible epoxy resins and plastics (like Vespel, PEEK), and housings capable of withstanding high temperatures and pressures. These modifications do not actually affect the motor's output torque.
Therefore, prior to production, if you wish to understand the torque curve of the vacuum motor, the best approach is to refer to the torque curve of the non-vacuum motor of the same specifications, as shown in the figure below:
The only difference is that this curve is tested in a standard atmospheric environment. Similarly, for other models of custom vacuum motors, their torque curves can be referenced in the same way.
Updated on: 30/10/2025
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