11RC-300-J-38/3 Danaher
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The Danaher 11RC-300-J-38/3 resolver is part of the Dynapar Resolvers series and features a primary winding on the rotor. It has an input voltage of 7.0 Vrms, an input current of 10.9 mA, and supports an input frequency of 5000 Hz. The resolver offers a transformation ratio of 0.95 and a phase shift of -6 degrees.
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Product Description:
The 11RC-300-J-38/3 resolver is manufactured by Danaher and belongs to the Dynapar Resolvers series. It is a rotary transformer that converts the mechanical shaft angle into two sinusoidal signals used by motion controllers to track position and velocity. Within automated equipment, the resolver mounts directly on a motor or gearbox shaft and provides real-time feedback to servo drives, CNC modules, or PLC cards. Its contactless transformer construction tolerates vibration, temperature fluctuations, and oil mist, extending its service life in environments where optical or magnetic encoders may fail.
The drive electronics energize the primary winding with an excitation voltage of 7.0 Vrms. This low amplitude minimizes dielectric stress while still supplying adequate magnetic flux. At that voltage, the primary draws only 10.9 mA, so heat buildup inside the stator is limited and light-gauge wiring can be used. The carrier excitation is centered at 5000 Hz, a frequency high enough to avoid audible noise and simplify the demodulation filters in the controller. The primary winding is located on the rotor, and induction couples energy across the air gap without the need for slip rings. The secondary amplitudes scale to the reference voltage with a transformation ratio of 0.95, allowing the drive to calculate the shaft angle with predictable signal gain and minimal calibration.
An electrical speed of 1 means the resolver completes one electrical cycle during each mechanical revolution, providing a one-to-one relationship that simplifies signal interpolation. The phase shift of -6 degrees indicates the lead or lag between the reference winding and the sine winding. Software can compensate for this small offset to maintain low angular error. When the rotor is aligned with the electrical zero position, the residual output is limited to 15 mV, indicating close symmetry between the resolver windings. The stable output signals support accurate position and velocity feedback during temperature changes, mechanical shock, and extended operating cycles. The contactless design also avoids the wear associated with brushes or other sliding electrical connections.
