21BRCX-600-J12 Danaher
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The Danaher 21BRCX-600-J12 is a resolver from the Dynapar Resolvers series, featuring a basic outer diameter of 2.1 inches and a housing length of 1.35 inches. This resolver has a single servo groove mount type, an excitation frequency of 7.5 kHz, and a housing made from aluminum. It handles an input current of 55 mA with an input voltage of 4.25 Vrms and weighs 9.4 ounces.
Internal Product Review
The 21BRCX-600-J12 is a Danaher Dynapar resolver with a single servo groove mount and an aluminum housing. Stable 7.5 kHz excitation and a 4.25 Vrms input support accurate position feedback in servo applications. Low 20 mV null voltage makes this unit a strong choice for precise motion-control integration.
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Product Description:
The 21BRCX-600-J12 is a brushless resolver manufactured by Danaher within the Dynapar Resolvers series. The unit couples mechanically to a motor shaft and generates angle-dependent sine and cosine signals that servo drives use for closed-loop motion control in industrial automation systems. Because a resolver contains only passive windings, it withstands vibration better than optical encoders while still meeting the update requirements of rapid acceleration profiles.
The resolver has a basic outside diameter of 2.1 in and a pilot diameter of 2.061 in that centers the frame in a motor end bell. A housing length of 1.35 in keeps the stack depth short, and the 0.8 in rotor bore fits over common laminated shafts without machining. The rotor extends 1.5 in, ensuring full coupling across the laminated stack. An aluminum housing dissipates stray heat, and the single servo-groove mount simplifies alignment during assembly. Despite its metal construction, the device weighs 9.4 oz, limiting the mass added to the motor assembly. The primary winding accepts a reference frequency of 7.5 kHz at 4.25 Vrms and draws 55 mA, so most servo drives can energize it directly.
Once excited, the secondary delivers a transformation ratio of 0.47, meaning each output track is approximately half the amplitude of the reference. Residual offset at electrical zero is limited to 20 mV, and phase displacement is held at +4°, permitting drive algorithms to resolve fine increments without large calibration tables. The reference circuit presents an impedance of 62+j61 Ω, while the signal circuit measures 80+j137 Ω; these values help with cable selection and the prevention of loading errors. The sine and cosine outputs vary continuously with shaft angle, allowing the connected drive to interpolate position between electrical cycles. This analog feedback remains available across the resolver’s operating speed range without relying on optical disks or onboard digital electronics.
