Product Description:

The B-204-A-21 is a brushless servo motor manufactured by Kollmorgen for the Kollmorgen Goldline B and BH Motors series. It converts commanded current into controlled torque and speed, enabling precise positioning or velocity regulation in automated packaging lines, pick-and-place robots, and other industrial motion axes. In a typical servo system, the motor works with a drive that adjusts current continuously so the axis can accelerate, run at a commanded speed, and stop with repeatable response. That operating role makes it suitable for machinery that needs coordinated motion rather than simple fixed-speed rotation.

Electromagnetic performance begins with a continuous stall torque of 4.7 N-m, produced while the stator windings draw a continuous line current of 2.7 A RMS at 25 °C. With a torque constant of 1.66 N-m/A RMS, the motor provides predictable torque for each ampere delivered by the drive. A back electromotive force of 100.5 VRMS/kRPM is generated as speed rises, while an inductance of 133 mH helps moderate current ripple in the phase windings. The phase resistance is 9.46 Ω, and peak dynamic events can be supplied by 8.7 A RMS of current if the applied line-to-line voltage remains within the 250 VRMS limit. This combination supports stable current response during both holding duty and short acceleration periods.

During acceleration, the motor can deliver a peak torque of 13.7 N-m without loss of synchronism, and it settles at a rated speed of 1900 RPM for continuous operation where mechanical output reaches 0.82 kW. The rated operating point supports continuous duty, while the higher peak torque is available for brief load changes such as indexing or rapid starts. Rotor inertia is 0.0001729 kg-m², which helps support quick velocity changes, and the total assembly weight is 6.2 kg for medium-size machine axes. The housing has an IP65 rating, and a shaft seal helps protect internal components from dust and low-pressure water jets. Because mating plugs are not included, field cables must be terminated directly to the motor connectors.