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Analysis of characteristics and working principle of torque sensor

Analysis of characteristics and working principle of torque sensor

(Summary description)The appearance of the torque sensor itself has been used in all walks of life in a short period of time and has become an indispensable variety in the sensor series.

Analysis of characteristics and working principle of torque sensor

(Summary description)The appearance of the torque sensor itself has been used in all walks of life in a short period of time and has become an indispensable variety in the sensor series.

Information

The appearance of the torque sensor itself has been used in all walks of life in a short period of time and has become an indispensable variety in the sensor series.

1. Characteristics of torque sensor:

1. It can measure both static torque and rotating torque, both static torque and dynamic torque.

2. High detection accuracy and good stability; prevent interference;

3. Small size, light weight, various installation structures, easy to install and use. Positive and negative torque can be continuously measured without repeating 0.

4. There are no wear parts such as conduction rings, which can run at high speed for a long time.

5. The high-level frequency signal output by the sensor can be directly sent to the computer for processing.

6. Measuring the strength of the elastomer can withstand high overload.

Second, the torque sensor measurement principle:

The special torsional strain gauge is attached to the elastic shaft to be measured as a strain glue to form a strain bridge, which supplies power to the strain bridge, and can measure the electrical signal of the elastic shaft torsion. After amplifying this deformation signal, it undergoes pressure/frequency conversion and becomes a frequency signal proportional to the torsional response. The energy input and signal output of the system are handled by two sets of special toroidal transformers with gaps, thus providing contactless energy and signal transmission.

3. Principle structure of torque sensor:

A special torque measuring sheet is pasted on the special elastic shaft to form a basic torque sensor-variable bridge. Fixed on the shaft: (1) the secondary coil of the energy loop transformer, (2) the primary coil of the signal loop transformer, (3) the printed circuit of the shaft, and the circuit board including the rectifier stable power supply, the instrument amplifier circuit, and the V/F conversion circuit and signal output circuit.

4. Working process of torque sensor:

Provide 15V power supply for the sensor, the crystal oscillator on the magnetic circuit generates a 400Hz square wave, and the AC magnetoelectric power supply is generated through the TDA2030 power amplifier. The energy is transferred from the stationary primary coil to the rotating secondary coil through the energy toroidal transformer T1. As a result, the AC power source obtains a 5V DC power supply through the rectifier and filter circuit on the shaft. This power supply is used as the operating power supply for the operational amplifier AD822. A high-precision power supply composed of a reference power supply AD589 and a dual operational discharge AD822 generates a 4.5V DC power supply. This power supply is used as the operating power supply for the bridge power supply, amplifier and V/F converter.

When the elastic shaft is twisted, the mV level deformation signal detected on the deformation bridge is amplified to a strong signal of 1.5v 1v through the instrumentation amplifier AD620, and then converted into a frequency signal through the V/F converter LM131. Through the signal ring transformer T2, it can be transmitted from the rotating primary coil to the stationary secondary coil, and then filtered and shaped by the signal processing circuit of the sensor housing to obtain a frequency signal proportional to the torque received by the elastic bearing. The transformer is in motion, and there are zeros between static loops. With only a few millimeters of clearance, part of the sensor shaft is sealed within the metal housing, forming an effective shield and therefore strong anti-interference ability.

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