Rotary Variable Differential Transformers (RVDTs) are devices that function by the motion of the rotor within the electro-magnetic field of the stator. This produces an electrical output signal, which has a known relationship to the mechanical motion. In simple terms the RVDT measures angular or rotary motion. These devices are available in an AC to AC configuration, giving an AC output signal at the same frequency as the input signal but with amplitude proportional to the rotor angular position.

RVDTs have a limited linear range covering any range up to ± 70° max.


Throttle control position monitoring, fin and control surface position sensing, fuel metering devices, rotational feedback devices.