Stepper Motor Pull-In and Pull-Out Torque Testing

According to the national standard GBT 20638-2006, there are four defined testing methods for stepper motors:

1. Magnetic powder brake + torque sensor method.
2. Dynamometer testing method.
3. Rope and spring balance method.
4. Rope and dual spring balance method.

Each of these methods has its specific applications:

• The first two methods cannot test small-range stepper motors due to rotational inertia issues.
• The last two methods are unsuitable for testing large-range stepper motors, are cumbersome, and require manual data recording.

To address small-range stepper motors, a customized testing device for medium and small-sized stepper motors has been developed. It supports one-click measurement, automatic results, and curve plotting, eliminating cumbersome testing processes and manual data errors. This system primarily performs automated testing and recording based on customer requirements for:

• Maximum static torque (holding torque)
• Detent torque (power-off holding torque)
• Output torque (torque-frequency characteristics)
• Starting torque (pull-in torque)
• Step angle and step angle error
• Maximum no-load starting and running frequencies