11BRCX-300-A95 Danaher
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The Danaher 11BRCX-300-A95 is a resolver from the Dynapar Resolvers series with a primary rotor winding and a total null voltage of 20 mV. It operates at an input voltage of 7.5 Vrms, input current of 13.5 mA, and input frequency of 4,000 Hz. The resolver offers a transformation ratio of 0.54 and a primary accuracy of 7 arc-min.
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Product Description:
The 11BRCX-300-A95 is an electromechanical resolver supplied by Danaher within the Dynapar Resolvers series. As an absolute rotary feedback element, it converts shaft angle into analog signals that servo drives interpret for position and velocity loops in industrial automation. The unit is intended for harsh environments where optical encoders may fail and provides continuous electrical rotation tracking without losing its reference position.
During operation, the resolver is excited by an input voltage of 7.5 Vrms applied to its rotor winding while drawing only 13.5 mA of excitation current, keeping the internal temperature rise low. The carrier signal runs at 4,000 Hz, providing suitable bandwidth for demodulation circuitry and supporting fast update rates in servo applications. A designed phase shift of -2° between the reference and output enables straightforward compensation in resolver-to-digital converters. The device has a transformation ratio of 0.54, establishing a proportional relationship between the reference amplitude and the secondary output. This relationship allows the drive to scale its decoding thresholds accurately while processing the resolver signals.
The resolver delivers a primary angle accuracy of 7 arc-min, making it suitable for medium-precision positioning in indexing tables, packaging axes, and similar equipment. Because the unit is built for a single-speed rotor, it produces 1 electrical cycle per mechanical revolution, simplifying parameter settings in the motion controller. The primary excitation is applied directly to a rotor winding, eliminating slip rings and improving reliability during continuous rotation. At electrical zero, the sensed differential voltage does not exceed 20 mV, so the null offset seen by the conversion electronics remains minor. This offset can be trimmed with minimal calibration effort to maintain repeatable feedback over changes in temperature and operating time.
