What is Static Friction Torque?
Friction and friction exists between the surfaces of two interacting objects. And always hinder the tendency of mutual or relative motion between objects.
Friction torque is generated when there is a distance between the tangential friction force of the contact surface and the speed of the object. It generates friction heat with the friction force, hindering the relative motion in the bearing.
The combined torque that hinders the movement of the shaft in the opposite direction to the shaft movement is the friction torque of the bearing.
According to the characteristics and measurement methods of the friction torque. The bearing friction torque can be divided into dynamic friction torque and static friction torque. Static friction torque also refers to the starting torque. Dynamic friction torque also includes the maximum torque and average torque generated during relative motion.
How to Check the Torque Sensor?
1. Check zero drift
Zero drift is one of the most common problems of torque sensors. It refers to the change in the output signal of the sensor when no torque is applied.
To check this, first install the torque sensor in the predetermined position. Ensure that no external force is applied. By monitoring the sensor output signal, observe whether it remains in a stable zero value range.
2. Confirm whether the signal is stable
Under normal working conditions, the output signal of the torque sensor should be proportional to the actual applied torque.
Therefore, when using a torque sensor, its output signal can be verified by applying a known load. For sensors with analog signal output, an oscilloscope or data acquisition equipment can monitor the signal in real time. Ensure that it is stable and consistent.
3. Perform static and dynamic calibration
Calibration is an important step in verifying. The torque sensor is working properly. First, you can apply a known torque under static conditions. Record the output of the sensor. Check the relationship between the output and the actual torque.
If there is a significant error, it may indicate that the sensor’s measurement accuracy is problematic. In addition to static calibration, dynamic testing should also be performed, especially in applications with high-speed rotation or rapid load changes.
4. Check temperature effects
Temperature affects the performance of torque sensors. Most torque sensors have temperature compensation functions. However, if the operating environment temperature changes too much. It may still affect the stability.
Therefore, the sensor should be tested under different temperature conditions. Ensure that its output signal remains accurate within the specified operating temperature range. If it is found that the temperature change has a significant effect on the output. The sensor may need to be recalibrated or a sensor with a better temperature compensation function may be used.
5. Check the physical condition
Checking the physical condition of the sensor is also key to determining whether it is working properly. External damage to the sensor, loose connection wires, or poor electrical contact can cause abnormal signals.
Regularly check the installation status of the sensor. Ensure that it is in good contact with the measurement object and has no physical damage.
As a precision instrument, any small abnormality of the torque sensor may lead to measurement errors. Therefore, it is very important to determine whether it is working properly.
