AC Operated, Light Weight RVDT

About AC Operated, Light Weight RVDT

The R30A RVDT (Rotary Variable Differential Transformer) is an angular position sensor that incorporates a proprietary non-contact design which dramatically improves long term reliability when compared to other traditional rotary devices such as synchros, 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 amplitude of the output signal, directly proportional to the shaft angle change, while 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.

AC operation eliminates the need for integrated signal conditioning components, thereby offering the user an extremely wide operating temperature range of -55^oC to +150^oC. Factory calibrated to operate over a +30 degree range, the R30A offers a non-linearity of less than +0.25% of full range. Extended range operation up to a maximum of +60 degrees is possible with increased non-linearity. Packaged in a small, size 11 servo mount, aluminum housing with flying lead termination, the R30A is ideal for space restrictive applications.

Also see our other angular position sensor models, R36AS (stainless steel housing, MS style connector), RSYN (high output, shock and vibration tolerant), R30D and R60D (bipolar DC operation), and the RVIT-15 Series (single ended DC operation, voltage or current output).

Details :

• AC operation
• 60 degree angular sensing range
• Light weight
• Non-contact design
• Wide operating temperature range
• Size 11 servo mount
• Anodized aluminum housing

Features :

• High accuracy
• Infinite resolution
• Long term reliability
• Wide -55^o to +150^oC operating temp range
• Rugged anodized aluminum housing
• Shielded ABEC 3 precision bearings

Application :

• Valve position
• Machine tool equipment
• Rotary actuator feedback
• Dancer arm position
• Process control

Specification :

Parameter	@10kHz Input Frequency (recommended)			@2.5kHz Input Frequency
Angular range, degrees	+30o	+40o	+60o	+30o	+40o	+60o
Non-linearity, % of FR, max.	+0.25%	+0.5%	+2%	+0.25%	+0.5%	+2%
Output at range ends (*)	87mV/	116mV/V	174mV/V	69 mV/V	92 mV/V	138 mV/V
Sensitivity	2.9 mV/V/degree			2.3 mV/V/degree
Temp coefficient of sensitivity	0.02%/oF [0.036%/oC], 20 to +160oF [-7 to +71oC]			Not specified
Input / Output impedance	370 / 1300			135 / 600
Phase shift	+3o			+35o
Input voltage and frequency	3 VRMS @ 2.5 to 10 kHz (10kHz recommended)
Null voltage	0.5% of FSO, maximum

Environmental And Mechanical Specifications :

Operating temperature	-67oF to +300oF [-55oC to 150oC]
Mechanical angular range	360 degrees (no stops)
Bearings	Shielded ABEC 3 precision
Shaft diameter	3/16 inch [4.76 mm]
Housing material	Aluminum, anodized
Mounting	Size 11 servo mount per BU-ORD
Moment of inertia	0.53 x 10-6 inch.lb-force.second2 [0.61 x 10-6 Kg-force.cm.second ]
Maximum torque, unbalance	0.004 inch.ounce-force [0.3 gram-force.cm]
Maximum torque, friction	0.015 inch.ounce-force [1.1 gram-force.cm]
Shaft load capability	10 lb [4.5Kg] Axial; 8 lb [3.6 Kg] Radial
Electrical connection	6 lead wires, AWG 28, PTFE insulation, 12 inches [30cm] long
Weight	1.3 oz [36 Grams]

Precision Rotary Measurement

Leveraging rotary variable differential transformer technology, this AC operated RVDT guarantees exceptional accuracy and repeatability in angular displacement detection. It is ideal for environments demanding precise rotary measurement, such as automation panels, industrial controls, and instrumentation setups. Its compact profile and light weight support easy integration into multiple application spaces.


Rugged Build and High Reliability

Constructed with a stainless steel shaft and aluminum alloy housing, the RVDT offers excellent durability alongside high insulation resistance (>100 MOhms at 500V DC). The product has been engineered for reliable performance in extreme temperatures ranging from -67F to +300F. Its linear output ensures consistent sensor readings under varied operating conditions.


Easy Installation and Versatile Use

This RVDT features a flange mount and standard 3-pin circular connector for straightforward installation. With its analog output interface and compact dimensions, the sensor fits seamlessly into diverse systems. Exporters, importers, and suppliers in India trust this device for its adaptable design and superior measurement capabilities.