In recent years, the use of torque sensors has gradually increased, it can convert physical changes into accurate electrical signals, so what methods can torque sensors go through?
The mature test method of torque sensor is strain electric measurement technology, which has the advantages of high accuracy, fast frequency response, good reliability and long life.
A strain bridge is formed by attaching a special change strain gauge to an elastic shaft with a strain adhesive. If a power supply is supplied to the strain bridge, the electrical signal of the elastic shaft can be measured.
This is the basic mode of the torque sensor. However, in a rotating power transmission system, the tricky problem for SUI is the bridge pressure input and the strain signal output detected by the strain bridge on the rotating body. How to reliably transfer between the rotating part and the static part is usually done with a conductive slip ring.
Because slip rings are attributed to collision touch, wear and heating inevitably occur, which restricts the speed of the shaft and the service life of the slip ring. Because the contact caused by signal fluctuation is unreliable, resulting in large measurement errors, and even unsuccessful measurement.
In order to overcome the defects of conductive slip rings, another way is to use radio telemetry technology: the torque strain signal is amplified on the rotating shaft, converted into a frequency signal with V≤F, and then through carrier modulation, and then radio-accepted, the change signal of the rotating shaft is wirelessly transmitted from the rotating axis to the outside.
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