R11-S01-F1A20A Danaher
Wake Industrial LLC is not an authorized distributor of this product.
The Danaher R11-S01-F1A20A resolver is part of the Dynapar Resolvers series and features a rotor as the primary winding with a transformation ratio of 1.40. It operates at an input voltage of 1.88 Vrms, input current of 21.0 mA, and input frequency of 2250 Hz. This resolver supports a maximum temperature of 125°C and has a phase shift of 11 degrees.
Internal Product Review
The R11-S01-F1A20A is a Dynapar resolver designed for accurate position feedback in industrial motion applications. A 2250 Hz input frequency with 1.88 Vrms excitation supports stable signal generation and dependable resolver performance. Low 15 mV null voltage and a 125°C maximum temperature rating make the unit a strong choice for demanding service conditions.
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Product Description:
The R11-S01-F1A20A is an electromechanical resolver supplied by Danaher within the Dynapar Resolvers series. A resolver converts shaft position into analog sine-cosine signals that motion controllers translate into an absolute angle, making it a feedback element for servo motors, rotary tables, and other closed-loop axes. Because the sensing coils and rotor operate on a wound-transformer principle, the unit withstands vibration and contamination better than optical encoders. This durability makes it suitable for harsh industrial automation environments where reliable position feedback is required.
The signal chain begins with an excitation winding that draws 21.0 mA of reference current when driven. That current flows at a carrier frequency of 2250 Hz, which provides the carrier signal used to demodulate the returned sine and cosine voltages. The reference source applies 1.88 Vrms to the primary winding, and the secondary windings return amplitudes whose ratio represents the shaft angle while maintaining a fixed phase relationship. Electrical coupling introduces a mechanical-to-electrical phase lag of 11°. The design places the primary winding on the rotor, allowing the stationary secondary windings to produce the position signals required by the connected control system.
The coupling efficiency between the primary and secondary windings has a transformation ratio of 1.40, providing sufficient output amplitude for precise analog-to-digital conversion. When the shaft aligns with electrical zero, the residual output, or null voltage, does not exceed 15 mV. This low residual voltage reduces the offset that the drive must compensate for when interpreting the resolver signals. The resolver uses a single-speed design with a speed count of 1, so one electrical cycle corresponds directly to one mechanical revolution. Its windings permit continuous operation at temperatures up to 125 °C, allowing the resolver to operate on motor housings or gearboxes where load torque produces substantial heat. The wound construction also avoids the optical components that can be affected by dust, oil, or other contaminants in industrial machinery.
