rotary displacement sensor / RVDT / analog

AC operated Rotary Variable Differential Transformers (RVDTs) measure rotary position up to +/-60degs. Like AC LVDT?s they contain no signal conditioning and are therefore chosen for their smaller size and use in hostile environments.

Description: RVDTs incorporate a proprietary non-contact design that dramatically improves long term reliability when compared to other traditional rotary devices such as syncros, resolvers and potentiometers. This unique design eliminates assemblies that degrade over time, such as slip rings, rotor windings, contact brushes and wipers, without sacrificing accuracy. High reliability and performance are achieved through the use of a specially shaped rotor and wound coil that together simulates the linear displacement of a Linear Variable Differential Transformer (LVDT). Rotational movement of the rotor shaft results in a linear change in the output signal, directly proportional to change in shaft angle, over ?60 degrees from the null position. The phase of this output signal indicates the direction of displacement from the null point. Non-contact electromagnetic coupling of the rotor provides infinite resolution, thus enabling absolute measurements to a fraction of a degree. The R30A and R36AS RVDTs are AC operated rotary transducers. AC excitation of 3 V rms results in a ratiometric AC output voltage that varies in direct proportion to the change in angular position of the transducer shaft.