21BRCX-621-JA84/15 Danaher
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The Danaher 21BRCX-621-JA84/15 is a resolver in the Dynapar Resolvers series featuring a 0.59 inch bore diameter and a housing length of 1.26 inches made from aluminum. It supports an excitation frequency of 7.5 kHz, has an input voltage of 6 Vrms, and a single servo groove mount style. The resolver also offers a pilot diameter of 1.85 inches and operates with an input current of 55 mA.
Internal Product Review
The 21BRCX-621-JA84/15 is a Danaher Dynapar resolver well suited for accurate motion feedback in servo applications. Operation at 6 Vrms with a 7.5 kHz excitation frequency supports clean signal performance and straightforward integration. Low 20 mV null voltage and an aluminum housing make this resolver a strong choice for dependable feedback.
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Product Description:
The 21BRCX-621-JA84/15 resolver is manufactured by Danaher and belongs to the Dynapar Resolvers series. As an electromagnetic rotary transducer, it supplies analog sine-cosine signals that allow servo drives to calculate shaft angle and velocity for closed-loop motion control in industrial automation. The unit is designed for direct mounting on motor or gearbox shafts where compact, brushless feedback is required under harsh operating conditions.
The resolver accepts an excitation signal of 7.5 kHz at an amplitude of 6 Vrms while drawing only 55 mA. These values establish the power that the drive must allocate to its reference transformer and influence the signal-to-noise ratio during high-speed operation. A bore diameter of 0.59 in allows the rotor to slide over standard fractional-inch shafts, while a pilot diameter of 1.85 in centers the stator against the mounting face for concentric alignment. An electrical speed of 1 means the resolver outputs one electrical cycle for each mechanical revolution, simplifying interpolation in digital converters. The stator and rotor windings have resistances of 11 Ω and 35 Ω, respectively, which affect internal copper loss and thermal rise. The single servo-groove mounting style provides a precise axial stop. A transformation ratio of 0.28 sets the amplitude relationship between the primary excitation and secondary output channels.
The housing has a length of 1.26 in, which helps control the resolver’s mechanical envelope during installation. Its aluminum shell limits weight while shielding the internal coils. At the calibrated null position, the resolver produces only 20 mV of residual voltage, supporting fine zero-offset calibration. The differential sine-cosine outputs have a phase shift of -1°, representing a small angular error that the receiving electronics can compensate for during signal processing. This compensation supports accurate position feedback during continuous operation on dynamic motion axes.
