21BRCX-500-MA7 Danaher
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The Danaher 21BRCX-500-MA7 is a resolver from the Dynapar Resolvers series with a basic outside diameter of 2.1 inches and a housing length of 1.25 inches. It features a steel housing, single servo groove mount style, and input requirements of 10 Vrms at 3 kHz drawing 17 mA. The resolver has a rotor bore of 0.5 inches, a pilot diameter of 2.061 inches, and a transform ratio of 0.81.
Internal Product Review
The 21BRCX-500-MA7 is a Danaher Dynapar resolver with a steel housing and single servo groove mount for dependable machine integration. Input requirements of 10 Vrms at 3 kHz support stable excitation and clean feedback in motion-control loops. Low 25 mV null voltage is a strong indicator of precise resolver performance.
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Product Description:
The 21BRCX-500-MA7 resolver is manufactured by Danaher and belongs to the Dynapar Resolvers series. This electromagnetic sensor provides absolute analog feedback by generating quadrature sine and cosine signals proportional to the shaft angle. Integrated into servo loops, the device supplies precise position data that lets motion controllers support accurate velocity and torque control and repeatable motor homing in presses, pick-and-place arms, and conveyor indexing systems. Resolver technology tolerates heat, vibration, and contamination better than optical encoders, so the unit fits applications that demand high reliability in industrial automation.
The excitation winding accepts 10 Vrms at 3 kHz, and the resulting magnetization draws 17 mA, which keeps drive dissipation low. Electrical symmetry is characterized by a primary-to-secondary transform ratio of 0.81, meaning the returned signal amplitude is roughly four-fifths of the reference. Rotor copper loss is limited by a resistance of 120 ohms, while the stator winding measures 150 ohms. Impedance values of 300 + j600 Ω (Zro) and 96 + j2135 Ω (Zso) help the controller model phase lag and set filter constants. The sine and cosine outputs deviate from perfect quadrature by only 4.5 degrees, and the residual null voltage is 25 mV, ensuring minimal error near electrical zero.
Mechanical integration relies on a 2.1 in outside diameter that fits standard motor end bells, while the housing length of 1.25 in keeps the stack depth short for compact equipment. A 2.061 in pilot centers the resolver, and a 0.5 in rotor bore accommodates a through-shaft for direct coupling to motor shafts or gear reducers. The steel enclosure provides magnetic shielding and physical strength in demanding operating conditions. The mounting face uses a single servo groove, allowing simple clamping without additional brackets.
