21BRCX-600-J39 Danaher
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The Danaher 21BRCX-600-J39 is part of the Dynapar Resolvers series and features an excitation frequency of 7.5 kHz with an excitation voltage of 4.25 Vrms. It has a housing length of 1.35 inches made of aluminum and weighs 9.4 ounces. The resolver offers a pilot diameter of 2.061 inches and a rotor bore of 0.67 inches.
Internal Product Review
The 21BRCX-600-J39 is a Dynapar resolver from Danaher built with an aluminum housing and a single servo groove mounting end. Excitation at 7.5 kHz with 4.25 Vrms supports stable signal generation for precise motion feedback. Position accuracy is especially appealing, with 7 arc-min pk-pk position error and 20 mV null voltage.
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Product Description:
The 21BRCX-600-J39 is a brushless resolver produced by Danaher within the Dynapar Resolvers series. This electromechanical sensor fits inside servomotor housings or mounts on a shaft extension, where it converts mechanical rotation into quadrature reference voltages for servo drive position and velocity loops. By providing an absolute electrical zero on every revolution, it supplies dependable feedback for packaging machinery, material-handling axes, and general-purpose process equipment that must withstand vibration, oil mist, and temperature swings.
The resolver’s primary winding is energized at 7.5 kHz, a carrier frequency that keeps signal processing clear of fundamental power harmonics. Drive electronics must supply an excitation of 4.25 Vrms, and the stator draws only 55 mA, limiting thermal rise in sealed motor frames. At electrical zero, the sine channel drops to a 20 mV null while the cosine output trails by 4 degrees, simplifying demodulation alignment. Magnetic coupling produces a transformation ratio of 0.47 that keeps secondary amplitudes predictable. The aluminum housing is 1.35 inches long and weighs 9.4 ounces, so it adds minimal mass to high-speed rotors. Factory-attached leads use 24 AWG conductors, extend 12 inches, and terminate without connectors for direct splicing into stator junctions.
For mechanical centering, the resolver registers on a 2.061-inch pilot and locks with a single servo groove, ensuring repeatable axial and radial alignment. The laminated rotor accepts a through-shaft through a 0.67-inch bore, and its active stack length is 1.77 inches, providing an adequate magnetic path without excess inertia. Total peak-to-peak position error is limited to 7 arc-minutes, allowing medium-precision servo loops to hold commanded angles without iterative correction. The compact housing reduces the space required around the motor shaft. Unconnected lead ends also permit direct integration with existing motor wiring. The servo groove secures the housing after the pilot centers it in the mounting assembly.
