M-605-B-21-B3E1 by Kollmorgen

The M-605-B-21-B3E1 is a brushless servo motor produced by Kollmorgen as part of the M Goldline Servo Motors series. Designed for closed-loop industrial axes, the unit converts drive current into precise torque profiles for indexing, contouring, or synchronous duties. With a frame that weighs 63 lb, it can be mounted to medium-to-large machinery where inertia matching and rugged mechanical coupling are required. Its electromagnetic assembly is configured for three-phase excitation, enabling smooth rotation and rapid reversal under digital motion control.

During continuous operation the rotor reaches 3150 RPM and delivers up to 7.7 kW of mechanical power. To maintain this output the windings draw a steady phase current of 27.7 A, which produces a shaft torque of 31.8 Nm at 25 °C. The motor generates a back electromotive force of 65.9 V RMS/kRPM, so the associated amplifier must supply proportional voltage as speed rises. Six magnetic poles set the electrical cycle length and help the feedback encoder resolve position accurately. These values characterize the steady-state thermal point and serve as the sizing reference for continuous-duty applications such as material handling gantries or printing cylinders.

Short-term load spikes are handled with a peak shaft capacity of 87.7 Nm, obtainable when the controller furnishes up to 84.8 A RMS. An inductance of 6.3 mH moderates current slew, aiding stability in high-bandwidth velocity loops. The electromagnetic design provides a torque constant of 1.09 N-m/A RMS, allowing the drive to compute torque directly from measured current. At a 40 °C ambient the continuous torque limit falls to 30.1 Nm, reflecting reduced thermal headroom. These peak values support dynamic motion profiles that include rapid starts, stops, and direction reversals.