R30D RVDTs DC-Operated Rotary Variable Differential Transformers DESCRIPTION RVDTs incorporate a proprietary noncontact 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 output signal that shifts ±60 (120 total) degrees around a factory specifications preset null position. The phase of this output signal indicates the direction of displacement from Full Range ±30° the null point. Noncontact electromagnetic Input Voltage (nom) ±15 Volts DC (±10%) coupling of the rotor provides infinite resolution, Scale Factor 0.125 V/° thus enabling absolute measurements to a Output Voltage (nom) ±3.75 VDC (at ±30deg) fraction of a degree. Input Current (max) 35 mA Although capable of continuous rotation, most Output Current (max) 5mA RVDTs are calibrated over a range of ±30 degrees, Output Impedance <10 Ohms with nominal nonlinearity of less than ±0.25% of Frequency Response 500 Hz@-3dB full scale (FS). Extended range operation up to a Storage Temperature maximum of ±60 degrees is possible with Range -67°F to 250°F (-55°C to 125°C) compromised linearity. Operating Temperature Range 0°F to 170°F (-18°C to 75°C) R30D Temperature The R30D RVDT is a DC operated noncontacting Coefficient of FS ±0.04%/°F 0.08%°C rotary transducer. Integrated signal conditioning Lead Wires 28 AWG, Teflon® insulation, enables the R30D to operate from a bipolar ±15 VDC 4 wire, minimum 12” long source with a high level DC output that is Torque 0.015 in-oz proportional to the full range of the device. Weight 1.9 oz (53 gm) Calibrated for operation to ±30 degrees, the R30D Mounting Size 11 servo mount BU-ORD provides a constant scale factor of 125 mVDC/degree. Bearings Shielded ABEC 3 precision Nonlinearity error of less than ±0.25% FS is achieved Shaft Diameter 3/16 in (4.76 mm) while maintaining superior thermal performance Axial Shaft Bearing over -18°C to 75°C. Load Capability 10 lbs (4.54 kg) The DC excitation is internally converted to an AC Radial Shaft Bearing carrier signal which excites the transducer’s primary Load Capability 8 lbs (3.6 kg) coil. An integrated demodulator amplifier and filter Casing Material Aluminum convert the differential secondary output into a smooth, high level, DC output signal that is linear with the shaft angle position. Resolution is infinite enabling measurements to a fraction of a degree. The R30D features a rugged aluminum size 11 housing making this rotary transducer ideal for applications where integrated signal conditioning and small size are required. Typical applications include hydraulic pump control, rotary actuator feedback, and throttle lever position feedback. Measurement Specialties, Inc. � 1000 Lucas Way Hampton, VA 23666 USA � www.meas-spec.com � 757-766-1500 � 800-745-8008 � Fax 757-766-4297 - 1 - R30D RVDTs Mechanical Specifications MOMENT OF INERTIA MAXIMUM TORQUE MAXIMUM LOAD WEIGHT SERVO MOUNT RVDT Model 2 Pound-Inch-Second Unbalance Friction Unbalance Friction Grams BU-ORD Inch-Ounces Inch-Ounces -6 0.53 X 10 .004 .015 810 53 11 R30D *Shaft end Electrical Specifications LINEARITY PERCENT OF RANGE ±30° ±40° ±60° 0.25 0.5 2.0 R30D dimensions in (mm) 0.062 (1.57) 0.062 (1.57) 0.093 + 0.000 Ø0.6250 - 0.001 (2.36) 0.050 + 0.000) (15.875 (12.7) - 0.025) + 0.000 Ø0.1875 - 0.001 + 0.000) (4.7625 - 0.025) Ø1.06 0.03 (26.92 0.76) + 0.000 Ø1.000 - 0.001 Ø0.82 + 0.000) (20.8) (25.4 - 0.025) 4 Leads 1.12 0.87 0.03 0.38 0.01 (28.45) (22.1 0.76) (9.65 0.25) Max wiring ordering information R-Flex coupler available Specify by model number. separately. INPUT OUTPUT +15VDC Model Number Size Range R30D 11 ±30° Red White -15VDC Black Green Common Measurement Specialties, Inc. � 1000 Lucas Way Hampton, VA 23666 USA � www.meas-spec.com � 757-766-1500 � 800-745-8008 � Fax 757-766-4297 R30D_0407 - 2 -