11BRCT-300-T64A Danaher
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The Danaher 11BRCT-300-T64A is part of the Dynapar Resolvers series and features a stator primary winding with a transformation ratio of 0.53. It operates with an input voltage of 12.0 Vrms and an input current of 6.0 mA at 2,500 Hz. The resolver's phase shift is -2 degrees and it has a null voltage of 15 mV.
Internal Product Review
The 11BRCT-300-T64A is a Danaher Dynapar resolver that stands out for stable position feedback with 12.0 Vrms input voltage and 2,500 Hz input frequency. Low 15 mV null voltage and -2 deg phase shift support accurate signal quality in demanding motion control applications.
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Product Description:
The 11BRCT-300-T64A resolver is a rotary position transducer built by Danaher and supplied under the Dynapar Resolvers series. Designed for closed-loop motion platforms, it converts mechanical shaft rotation into sine and cosine voltages that servo drives can interpret as absolute angular feedback within each revolution. The rugged transformer-based sensing method tolerates high temperatures, shock, and electrical noise, making the device suitable for motor commutation, robotic joints, and general automation axes that require continuous and precise rotor angle data.
Excitation is delivered through an input carrier of 12.0 Vrms that draws only 6.0 mA, so the drive’s reference oscillator can energize the resolver with modest power demand. The secondary windings are tuned for a carrier frequency of 2,500 Hz, limiting inductive reactance and keeping the signal phase consistent across typical cable lengths. Because the stator holds the primary winding, the arrangement helps keep rotor mass and rotational inertia low. The sine-to-cosine amplitude relationship has a transformation ratio of 0.53, which provides the scale factor used by the controller when converting the resolver outputs into digital position counts. This ratio also allows the receiving electronics to normalize both feedback channels before calculating the measured shaft angle.
Electrical centering error is limited by a null output of only 15 mV, so residual voltage at the mechanical zero remains small and requires less offset compensation in the drive. Differential signal timing has a phase shift of -2 degrees, providing a predictable angle between the excitation and returned waveforms for accurate demodulation. The resolver uses a rotor speed code of 4, producing four electrical cycles per mechanical revolution to support finer position interpolation without increasing the carrier frequency. The multiple electrical cycles allow the controller to detect smaller angular changes when it tracks the cycle position together with the sine and cosine amplitudes. Transformer coupling also avoids sliding electrical contacts in the sensing path, which supports stable feedback during continuous shaft rotation and repeated motion cycles.
