Rotary Variable Differential Transformers (RVDTs)

Moog's RVDTs utilize brushless, non-contacting technology to ensure long-life and reliable, repeatable position sensing with infinite resolution. Such reliable and repeatable performance assures accurate position sensing under the most extreme operating conditions.

Model Voltage
(VRMS)*
Frequency
(Hz)
Primary (Input) Impedance** Scale Factor (V/Deg) Angular Displace-ment
(+/- Deg)
Accuracy
(+/- Deg)
AS-827-001 8.0 1,870 65 + j475
0.061 40 0.2
AS-827-002 8.0
1,870
65 + j475
0.068 40
0.3
AS-827-003 8.0
1,870
65 + j475
0.068 40
0.3
AS-827-004 8.0
1,870
65 + j475
0.061 42 0.4, 0.6
AS-865-001
6.0 3,000 50 + j455
0.061 40
0.2
AS-887-001
7.0 3,000 217 + j448
0.052 30 0.25
RV-08-B-05C 5.7 3,500 84 + j99
0.019 80 0.50***
PRV-15-A-15A
3.5 2,879 TBD 0.015 37 0.2

*Voltage and frequencies shown are typical. RVDTs can operate at other voltages and frequencies. Our design engineers are happy to design an RVDT to meet your voltage and frequency requirements

**Primary impedance is shown as nominal

***Accuracy varies with excursion angle

What are RVDTs?

A Rotary Variable Differential Transformer (RVDT) is an electromechanical transducer that provides a variable alternating current (AC) output voltage that is linearly proportional to the angluar displacement of its input shaft. When energized with a fixed AC source, the output signal is linear within a specified range over the angular displacement.

 

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Typical Applications

  • Flight control actuation / navigation
  • Fuel control / valves
  • Cockpit controls
  • Nose wheel steering systems
  • Missile fin actuation

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