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Stepper Motor Pull-In and Pull-Out Torque Testing
This system is designed for performance testing of car window lift motors and sunroof motors. It measures parameters such as motor speed, torque, and current to assess the motor’s performance condition.
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:
- Magnetic powder brake + torque sensor method.
- Dynamometer testing method.
- Rope and spring balance method.
- 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
Comprehensive Stepper Motor Testing System Overview:
The stepper motor pull-in/pull-out torque testing equipment is composed of:
- Force sensors
- Testing fixtures
- Single-axis robot
- Tension-free traction rope
- Pulleys
- High-precision magnetic encoder
Working Principle:
- Fix the stepper motor being tested and lock a pulley (equipped with a planar magnet) onto the motor’s output shaft.
- Wrap a tension-free traction rope around the pulley and attach both ends to the hooks of two sensors.
- The software controls the motor’s rotation and the single-axis robot’s movement of the sensors, applying torque to the motor through the pulley.
- The software records the sensor values and magnetic encoder speed in real-time until the motor “steps out.”
- Torque is calculated via a formula, and the maximum torque for the frequency range is identified as the motor’s pull-out torque at that frequency.
By controlling the motor under various frequencies (speeds), the system measures pull-out torque across different frequencies and generates a torque-frequency curve.
Software Interface:
Demo / Application Photo and Video
Motor Testing System
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