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Torque sensor manufacturers talk about the truth of torque s

source:  Release date: 2018-10-14
Torque sensor manufacturers talk about the truth of torque sensors
The torque sensor is mainly used to measure various torques, speeds and mechanical efficiencies. It converts the change of torque into an electrical signal whose accuracy is related to the accuracy of the test system. Its main feature is that it can measure both static torque and rotational torque and dynamic torque. The torque sensor is a high-precision sensor that can measure very small uncertainties. However, in order to obtain highly accurate measurement results, it is very important to reduce the parasitic load that affects the sensor. It is often caused by incorrect installation or combination of the drive train. The radial offset of the shaft end mounted on the measuring flange will produce radial and bending moments. Similarly, the radial angular offset will produce axial and bending moments to the sensor.
The torque sensor has high detection precision, good stability and strong anti-interference ability. It can continuously measure the forward and reverse torque without repeated zero adjustment. There is no wear part such as conductive ring, it can run at high speed for a long time; it outputs high frequency. Signals can be sent directly to the computer for processing. Let’s take a quick look at the classification of commonly used torque sensors.

First, non-contact torque sensor

The non-contact torque sensor is also a dynamic torque sensor, also called a torque sensor, a torque speed sensor, and the like. Its input shaft and output shaft are connected by a torsion bar, the input shaft has a spline, and the output shaft is a keyway. When the torsion bar is twisted by the turning moment, the relative positions of the spline and the keyway are changed, and they are changed. The relative displacement change amount is the twist amount of the torsion bar. Such a process causes the intensity of the magnetic induction on the spline to change and is converted into a voltage signal by the coil.

It has long life, high reliability, is not easy to be worn, has less delay, and is less affected by the shaft. It is widely used.

Second, the strain gauge torque sensor

The strain gage torque sensor uses strain electrical measurement technology. Its principle is to use the elastic shaft and paste the strain gauge to form the measuring bridge. When the elastic shaft is slightly deformed by the torque, the resistance value of the bridge will change, and the electrical signal will change to realize the torque measurement.
It has the characteristics of high resolution, small error, large measuring range and low price, which is easy to select and use in large quantities.
Third, phase difference torque speed sensor
According to the magnetoelectric phase difference torque measurement technology, two sets of gears with the same number of teeth, shape and installation angle are installed at both ends of the elastic shaft, and the proximity sensor is installed outside the gear. When the elastic shaft rotates, the waveforms of the two sets of sensors produce a phase difference, thereby calculating the torque.
The non-contact transmission of the torque signal is realized, and the detected signal is a digital signal, and the rotation speed is high. However, such a torque sensor is bulky, and the performance at low speed is not ideal, so the application is not very extensive.

When selecting the torque sensor, it should be selected according to the type of torque of the object to be measured, the working condition of the working condition, the structural characteristics of the object to be tested, the test position, the rotational speed of the object to be measured, and the rated torque value.

Application area of ​​torque sensor

As a kind of precision measuring instrument for measuring various torques, speeds and mechanical powers, the torque sensor converts the physical changes of torsion into precise electric signals. At present, it is mainly used in the detection and detection of output torque and power of rotating power equipment such as electric motors and engines. Torque and power detection in locomotives, automobiles, aircraft, mining machinery; detection of torque and power in sewage treatment systems; manufacturing of viscometers; laboratory, testing department and production monitoring and quality control. Torque sensors are available in engineering manufacturing or in transportation or research institutes.