21BRCX-511-D42B Danaher
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The Danaher 21BRCX-511-D42B is a resolver from the Dynapar Resolvers series with a steel housing measuring 1.06 inches in length and an outer diameter of 2.1 inches. It features a single servo groove mount style and has a rotor bore of 0.5 inches keyed with a 1.997 inch pilot diameter.
Internal Product Review
The 21BRCX-511-D42B is a Danaher Dynapar resolver configured as a rotor primary unit with single servo groove mounting. Steel housing and a keyed rotor bore support dependable alignment and consistent performance in servo feedback assemblies. A compact form factor makes this resolver an excellent choice for precise motion-control integration.
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Product Description:
The 21BRCX-511-D42B belongs to the Dynapar Resolvers series produced by Danaher. This resolver rotor works with a compatible stator assembly to convert shaft angle into analog sine-cosine voltage pairs, providing absolute position feedback to motion controllers and servo drives. Direct coupling to a machine shaft allows the component to monitor rotary movement without brushes or sliding electrical contacts. Its rugged operating principle supports use in packaging lines, robotics, metal-forming equipment, and other factory automation systems exposed to elevated temperatures or substantial vibration. The feedback signals allow connected control equipment to determine angular position throughout each shaft revolution.
The rotor housing measures 1.06 in long, allowing a short axial stack inside compact encoder cavities. Its 2.1 in outside diameter provides the magnetic air gap needed for resolver operation while clearing compatible motor end bells. A 1.997 in pilot centers the rotor coaxially with the stator, helping reduce eccentricity and the resulting position errors. Torque is transmitted through a 0.5 in keyed bore, which secures the rotor to the shaft without relying exclusively on friction. The body is made of steel, providing the stiffness needed to withstand torsional loads. The material also creates a continuous magnetic path that supports consistent signal linearity during rotation.
The rotor uses a single servo groove mount that mates with compatible servo flange hardware and helps keep axial movement within resolver tolerances. Its active element is classified as a rotor primary, allowing it to interact with the externally connected resolver circuitry during excitation and signal demodulation. Proper alignment between the rotor and stator is important because excessive runout can change the air gap and reduce feedback accuracy. The compact body can be installed within motor feedback assemblies where axial space is limited. Stable impedance, rotational balance, and magnetic behavior support predictable feedback signals in closed-loop drive systems. Correct mounting also helps preserve concentric rotation under changing speed and load conditions.
