21BRCX-335-J39 Danaher
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The Danaher 21BRCX-335-J39 is a resolver in the Dynapar Resolvers series with a steel housing that measures 1.35 inches in length and an outer diameter of 2.1 inches. It features an excitation frequency of 7.5 kHz, input voltage of 4.25 Vrms at 55 mA, and a transformation ratio of 0.47. The rotor resistance is 36 Ohms, while the stator resistance is 15 Ohms.
Internal Product Review
The 21BRCX-335-J39 is a Danaher Dynapar resolver with a 7.5 kHz excitation frequency and 4.25 Vrms input voltage. Steel housing and a low 20 mV null voltage support dependable signal stability, making this resolver a strong choice for accurate motion feedback.
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Product Description:
The 21BRCX-335-J39 resolver is manufactured by Danaher and supplied as part of the Dynapar Resolvers series. This brushless rotary transformer delivers absolute position feedback for servomotor axes, indexing tables, and similar automation tasks. Its sine-cosine output pair is resistant to interference from light, dust, and oil, allowing motion controllers to maintain closed-loop accuracy in environments that challenge optical encoders. Encapsulated windings and a steel housing also help the unit endure high vibration while continuing to report shaft angle without a loss of resolution.
An excitation signal at 7.5 kHz drives the primary winding, and the resolver accepts a reference voltage of 4.25 Vrms while drawing only 55 mA. Within this excitation range, the secondary delivers a transformation ratio of 0.47, so the amplitude of each output track is approximately half the reference level. A fixed phase shift of 4 degrees between voltage and current simplifies compensation inside the drive electronics. Null voltage is limited to 20 mV, indicating minimal residual error when the rotor is aligned with the electrical zero. The impedance measured across the rotor leads is 62 + j61 Ω (Zro), while the stator output path has an impedance of 80 + j137 Ω (Zso). These values establish the load-matching requirements for the downstream signal conditioner and help preserve the accuracy of the resolver output.
Mechanical integration is supported by a 0.67-inch shaft bore, a pilot diameter of 2.061 inches, and an outer frame diameter of 2.1 inches. The overall housing length is 1.35 inches, and the laminated rotor stack extends 1.77 inches along the axis. Steel construction resists deformation during clamping and provides a rigid body for installation in demanding motion systems. Winding losses are governed by a rotor resistance of 36 Ω and a stator resistance of 15 Ω. These resistance values influence thermal rise during continuous excitation and should be considered when the resolver is connected to its reference source and signal-conditioning electronics.
