Torque sensor working principle

Torque sensor working principle overview:

Torque sensors are usually measured based on strain technology or magnetoelectric principles. Its main purpose is to convert the physical change of torque into an electrical signal for easy detection and analysis.

Torque sensors based on strain technology:

1. Design structure: The sensor adopts a metal elastomer as the measuring body, which is installed with a strain gauge (SG). The strain gauge is firmly attached to the elastomer, and when an external load acts on the sensor, the measurement body deforms and the resistance of the strain gauge changes accordingly.
2. Load measurement: The load size can be measured through the change of resistance. For the torque sensor, the measuring body is affected by the lever torque or torque when it is used, resulting in torsion. Therefore, special strain gauges are required to measure this type of load.
3. Data transmission: Because the rotor of the rotary torque sensor is rotating, traditional power supply and data transmission cables cannot be used. Therefore, a non-contact connection is required to transmit signals or electrical energy from the stator to the rotating rotor.

Torque sensor based on magnetoelectric principle:

1. Installation structure: A toothed disk is installed on both sides of the torsion shaft between the drive source and the load, and two corresponding magnetoelectric sensors are installed next to it.
2. Working principle: The detection component of the sensor is composed of a permanent magnet, an induction coil and an iron core. The magnetic force line generated by the permanent magnet intersects with the tooth shaped disk. When the tooth shaped disk rotates, the tooth convex and concave of the disk cause the change of the air gap of the magnetic circuit, resulting in the change of magnetic flux. An AC voltage is induced in the coil at a frequency equal to the product of the number of teeth on the disc and the number of revolutions.
3. Torque measurement: When the torque acts on the torsion shaft, there is a phase difference in the induced voltage output of the two magnetoelectric sensors, and the phase difference is proportional to the torsion Angle of the torsion shaft. The torque can be obtained by measuring the change in phase difference.

The above is a brief overview of the working principle of torque sensor based on strain technology and magnetoelectric principle. In practical applications, the specific structure and principle may vary from manufacturer to manufacturer and model.



The above information is for reference only, not for professional literature