11BRW-300-B1 Danaher
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The Danaher 11BRW-300-B1 is a single-speed resolver in the Dynapar Resolvers series with an input voltage of 12.0 Vrms and input frequency of 400 Hz. The resolver features an input current of 10.9 mA, a transformation ratio of 1.75, and a primary accuracy of 10 arc-min.
Internal Product Review
The 11BRW-300-B1 is a Danaher Dynapar resolver engineered for dependable motion feedback, with 12.0 Vrms input voltage and 400 Hz input frequency. Primary accuracy of 10 arc-min and low total null voltage of 30 mV support clean, consistent signal performance in precision drive systems.
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Product Description:
The 11BRW-300-B1 is a rotary resolver produced by Danaher within the Dynapar Resolvers series. In motion-control loops, this component converts the mechanical shaft angle into analog sine and cosine voltages that a drive or controller interprets as an absolute position. Because the resolver is an electromagnetic transducer rather than an optical device, it tolerates the oil, dust, and temperature cycling found in industrial automation while still providing continuous angular feedback for servo motors, machine tools, and robotic joints.
The primary winding is excited with 12.0 Vrms, so a standard low-power resolver drive card can energize the unit without additional step-up circuitry. Under that excitation, the coil draws only 10.9 mA, limiting thermal rise and allowing compact installation in sealed housings. The carrier excitation must be a sinusoidal signal at 400 Hz; this frequency balances magnetic coupling efficiency with the response bandwidth needed for moderate- to high-speed axes. The induced secondary amplitude has a transformation ratio of 1.75, providing signal levels that are large enough for ratiometric decoding yet small enough to avoid amplifier saturation. Electrical quadrature between the sine and cosine channels is established by a mechanical phase shift of 12 degrees, simplifying resolver-to-digital converter calibration because the shift remains constant over changes in temperature and speed.
The resolver has a primary accuracy of 10 arc-min, limiting the maximum angular error in closed-loop applications that require tight positional repeatability. When the rotor aligns exactly with the electrical zero, residual cross-coupling is limited to 30 mV of total null voltage, so the controller requires only minor offset correction. The device uses a single-speed profile, producing one electrical cycle per mechanical revolution and allowing absolute angular reporting across 360 degrees when paired with suitable interpolation electronics. All windings reside on the stator, enabling a solid rotor that withstands the high centrifugal forces generated during rapid indexing or continuous rotation.
