RVDT

Rotary Variable Differential Transformer

Contactless Angular Position Sensor
The RVDT (Rotary Variable Differential Transformer) is a precision angular position sensor that operates on the principle of contactless electromagnetic coupling. It provides highly accurate, repeatable, and reliable angular displacement measurement for aerospace, defence, and industrial applications.

Key Features

Contactless electromagnetic coupling for frictionless operation
Electric stroke: ±30°
High sensitivity: 2.9 mV/V/degree
Virtually infinite resolution for precise angular feedback
Low null voltage: 0.5% of FRO
Excellent linearity: ±0.25% FRO
Wide temperature range: -55 °C to +90 °C
Frequency range: 2.5 to 10 kHz
No mechanical wiper or contact element for high reliability
ISO 9001:2015 certified manufacturing

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Product Identification

Model / Part Number Rotary Variable Differential Transformer

Item Description RVDT (Rotary Variable Differential Transformer)

Sensing Principle Contactless electromagnetic coupling

Electrical & Performance Specification

Electric stroke (E) ±30°

Null voltage (N) 0.5% of FRO

Sensitivity (S) 2.9 mV/V/degree

Input / excitation voltage (V) 3 Vrms

Input impedance 370 Ω at null position

Temperature range (T) -55 °C to +90 °C

Electric input frequency 2.5 to 10 kHz

Calibration frequency 10 kHz (testing frequency)

Output load resistance 50 kΩ

Phase angle +3°

Non-linearity ±0.25% FRO

Design Characteristics

Resolution Virtually infinite

Contact wear None — frictionless, non-contacting design

Reliability High — no mechanical wiper or contact element

Compliance & Certification

ISO 9001:2015 Quality management system certification

Quality & Final Test Requirements

Test Requirements Each unit shall be verified at final test against the specifications including null voltage, sensitivity, non-linearity, and phase angle, at the calibration frequency of 10 kHz using the specified output load resistance of 50 kΩ.

Excitation voltage and frequency shall be verified within the specified input range (3 Vrms, 2.5 to 10 kHz) prior to release. Units shall be functionally checked across the full electric stroke of ±30°.