Product Description:

The B-604S-A-51-B3 is a brushless servo motor manufactured by Kollmorgen as part of the Kollmorgen Goldline B and BH Motors series. The model is intended for closed-loop, high-precision axis control in industrial automation, where it drives gantries, presses, and material-handling equipment that demand consistent torque production across a wide speed range. When paired with a matching Kollmorgen drive, the motor supplies the electromechanical output needed to translate electrical commands into repeatable mechanical motion.

At its rated operating point, the motor delivers 6000 W of mechanical power while turning at 2150 rpm, producing a continuous shaft torque of 26.65 N-m. To sustain this output, it draws 19 A RMS from the drive and presents a terminal resistance of 0.51 ohms, which are important considerations for drive sizing and cabling. Continuous stall torque is 30.1 N-m, allowing static holding under commanded current. The torque constant is 1.58 N-m/A RMS, while the back EMF constant is 95.78 Vrms/krpm. These values affect current requirements and the voltage generated as motor speed increases. The phase inductance is 13.3 mH, which smooths current ripple and supports servo stability during rapid command changes.

For short-term load surges, the motor withstands a peak torque of 86.4 N-m and a corresponding peak current of 57.4 A RMS without demagnetization, providing additional capacity for acceleration. The integrated spring-applied, power-released brake operates at 24 V DC and draws 1.27 A. Once engaged, it secures the shaft with 48 N-m of holding torque while adding 0.000127 kg-m² of inertia to the system. The rotor has an inertia of 0.00203 kg-m², supporting responsive speed changes during high-bandwidth positioning tasks. The brake also provides power-off holding for vertical axes when the drive can no longer maintain commanded torque.