21BRCX-607-HG72 Danaher
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The Danaher 21BRCX-607-HG72 resolver from the Dynapar Resolvers series features a housing length of 1.06 inches, a pilot diameter of 2.061 inches, and a weight of 7.4 ounces. It is constructed with an aluminum housing and operates with an excitation frequency of 10 kHz and input voltage of 7 Vrms. The resolver has a transformation ratio of 0.50 and a rotor bore of 0.5 inches.
Internal Product Review
The 21BRCX-607-HG72 is a Danaher Dynapar resolver engineered for stable feedback operation with a 10 kHz excitation frequency and 7 Vrms input voltage. An aluminum housing and 7 arc-min pk-pk error support dependable installation and accurate position sensing in motion systems. A 0.50 transformation ratio makes this unit a strong choice for precise resolver integration.
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Product Description:
The 21BRCX-607-HG72 is a brushless resolver produced by Danaher for the Dynapar Resolvers series. In servo loops, it converts shaft position into analog sine-cosine signals that tolerate electrical noise better than signals from many digital encoders. This performance makes the resolver suitable for heavy-duty industrial automation and motor commutation tasks. Its analog output allows a compatible controller to track rotor angle continuously throughout each revolution.
Electrical operation uses an excitation carrier of 10 kHz; this frequency keeps induced voltages high enough for signal fidelity while remaining below common radio-frequency bands. The stator accepts a reference voltage of 7 Vrms and draws only 30 mA, so drive electronics can power the device directly from a low-power oscillator stage. A null output of 30 mV indicates minimal residual voltage when the rotor is at electrical zero, supporting precise winding symmetry. Phase alignment is clockwise with a -8° shift between the reference and output signals, and the drive settings must account for this shift to prevent systematic angle offsets. The transformation ratio is 0.50, meaning that each secondary winding delivers half the amplitude of the applied reference voltage. The controller uses this ratio when calculating the absolute shaft angle from the secondary signals. Primary impedance is 145 + j240 Ω, while secondary impedance is 265 + j485 Ω; these complex values indicate the load presented to the exciter and support appropriate filter design and current limiting.
A compact 1.06-inch housing encloses a rotor with a matching stack length for balanced magnetic coupling. Positional accuracy remains within a 7 arc-min peak-to-peak error, supporting medium-resolution motion profiles without additional interpolation. The front pilot has a diameter of 2.061 inches for concentric mounting, while the 0.5-inch bore accommodates standard servo motor shafts without sleeves. The aluminum housing keeps the total mass to 7.4 ounces and limits the inertia added to the drivetrain. The compact housing and low mass allow installation in servo assemblies with restricted space around the motor shaft.
