Advantages of digital torque sensors – Autotonics

In the rotary power system, the most frequently involved parameter: rotational torque, in order to detect the rotational torque, the traditional use of torsion angle phase difference sensors. The more mature detection method of torque testing is strain electrical testing skills. It has the advantages of high precision, fast frequency response, good reliability and long life.

The special torsional strain gauge is pasted on the measured elastic shaft with strain gauge glue to form a strain bridge, and if the working power supply is provided to the strain bridge, the electrical signal of the torsion of the elastic shaft can be tested. This is the basic torque sensor mode.

However, in the rotary power transmission system, the most difficult problem is how the bridge pressure input and the detected strain signal output of the strain bridge on the rotating body can be reliably transmitted between the rotating part and the stationary part, which is usually done by using a conductive slip ring.

Because the slip ring is attributed to friction touch, it is inevitable that there will be wear and heat, so the speed of the rotating shaft and the service life of the slip ring are restricted. And because the signal fluctuation caused by unreliable touch, the measurement error is large or even the measurement is unsuccessful. In order to overcome the shortcomings of conductive slip rings, another method is to adopt the method of radio telemetry: the torque strain signal is expanded on the rotating shaft and converted into a frequency signal by V/F, and the radio transmission method is transmitted from the rotating shaft to the outside of the shaft by radio modulation, and then the torsion signal of the rotating shaft can be obtained by the method of radio acceptance.

Advantages of digital torque sensors – Autotonics

Advantages of digital torque sensors – Autotonics

The power supply on the rotating shaft is a battery fixed to the rotating shaft. This method is called a telemetry torque meter. The success of the telemetry torque meter lies in overcoming the two shortcomings of the slip ring, but there are also three shortcomings,

First, it is susceptible to the interference of electromagnetic waves at the application site;

Second: because it is battery-powered, it can only be used for a short period of time.

Third: because the structure is attached to the rotating shaft, it is easy to cause dynamic balancing problems at high speeds. Outstanding for small measuring ranges and small diameter shafts.

The digital torque sensor absorbs the advantages of the above methods and overcomes its shortcomings, and designs two sets of resolvers on the basis of the strain sensor to complete the non-touch transmission of power and signal. And the transmission of the torque signal has nothing to do with whether it rotates, has nothing to do with the speed and has nothing to do with the direction of rotation.

Advantages of digital torque sensors – Autotonics

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