Operation process of torque sensor

Paste the special torsion strain gauge on the elastic shaft to be measured with strain adhesive and form a strain bridge. Supply power to the strain bridge to measure the electrical signal of the elastic shaft under torsion. After amplifying the strain signal, it undergoes voltage/frequency conversion and becomes a frequency signal proportional to the torsional strain. Provide ± 15V power supply to the sensor, and the crystal oscillator in the excitation circuit generates a 400Hz square wave. After passing through the TDA2030 power amplifier, an AC excitation power supply is generated. The AC power supply is transmitted from the stationary primary coil to the rotating secondary coil through the energy ring transformer T1. The obtained AC power supply is obtained through the rectification and filtering circuit on the shaft to obtain ± 5V DC power supply, which serves as the working power supply for the operational amplifier AD822; A high-precision stabilized power supply composed of a reference power supply AD589 and a dual operational amplifier AD822 generates a precision DC power supply of ± 4.5V. This power supply serves as both the bridge power supply and the working power supply for amplifiers and V/F converters.
When the elastic shaft is twisted, the mV level strain signal detected by the strain bridge is amplified into a strong signal of 1.5v ± 1v through the instrument amplifier AD620, and then transformed into a frequency signal through the V/F converter LM131. The signal is transmitted from the rotating primary coil to the stationary secondary coil through the signal ring transformer T2, and then filtered and reshaped by the signal processing circuit on the sensor shell to obtain a frequency signal proportional to the torque borne by the elastic shaft, This signal is at TTL level and can be provided for display by dedicated secondary instruments or frequency meters, or directly sent to a computer for processing.
The frequency signal output by the torque sensor is 10kHz at zero point, 15KHz at full scale for forward rotation, and 5KHz at full scale for reverse rotation. The full scale variable is 5000 units per second. The speed measurement adopts the measurement method of photoelectric gear or magnetoelectric gear. The shaft can generate 60 pulses per revolution. Frequency measurement can be used for high-speed or medium speed sampling, and period measurement can be used for low-speed sampling. The accuracy of this sensor can reach ± 0.2% to ± 0.5% (F • S). Due to the frequency signal output of the sensor, it can be directly sent to the computer for data processing without the need for AD conversion.
We have compiled the characteristics and workflow of torque sensors for better selection by technical personnel in need. I hope our work can bring you some help.