Product Description:

The B-204-C-31-B3 is a brushless servo motor produced by Kollmorgen within the Kollmorgen Goldline B and BH Motors series. As a servo actuator, it converts drive commands into controlled rotary motion. This supports precise positioning, velocity regulation, and synchronized multi-axis moves in automated assembly cells, pick-and-place modules, and high-speed packaging lines.

For continuous operation at 40 °C, the motor can deliver 4.79 N-m of torque while drawing a continuous phase current of 9.8 A RMS. When a process demands short bursts, the drive may supply 29.5 A RMS, enabling a peak torque output of 13.7 N-m. The three-phase stator presents a line-to-line resistance of 0.786 Ω and an inductance of 12.0 mH, factors that influence current ripple and controller tuning. With a torque constant of 0.49 N-m/A RMS, the motor produces predictable output per ampere, and its thermal design supports a rated mechanical power of 2.8 kW. The windings are insulated to accept bus voltages up to 250 VRMS, allowing direct connection to many standard servo amplifiers without an intermediate transformer.

Dynamic behavior is aided by a rotor inertia of 0.0001729 kg-m², complemented by an integral holding brake that adds only 2.47 × 10⁻⁶ kg-m² to the load. The brake is energized at 24 VDC, draws 1.27 A, and secures the shaft with 6.0 N-m of static torque for vertical-axis safety. During motion, the motor reaches its rated speed of 6200 RPM, at which point the back electromotive force rises in proportion to the constant of 29.6 VRMS/kRPM. This relationship lets the drive regulate voltage margins while the continuous stall capability of 4.79 N-m keeps throughput steady under sustained load.