Product Description:

The B-802-A-21 is a brushless servo motor produced by Kollmorgen as part of the Kollmorgen Goldline B and BH Motors series. The motor converts drive current into regulated torque and speed for positioning tasks in industrial automation such as material-handling axes and gantry stages. Resolver feedback integrated in the stator supplies reliable rotor position data even in electrically noisy environments. Because the motor uses brushless commutation, it avoids brush wear and supports consistent operation in repetitive motion systems.

With a square mounting frame of 190.0 mm and a 10.000 mm output shaft, the motor delivers a continuous mechanical output of 7.9 kW while holding a continuous stall torque of 42.0 N-m. That torque is maintained when the windings carry a continuous line current of 24.9 A RMS, a value related to the 1.69 N-m/A RMS torque constant. Electrical characteristics include an inductance of 16.3 mH and a 0.361 Ohm DC resistance, both of which affect current response and copper losses. The back electromotive force is 102.0 VRMS/kRPM, so the drive must counter the generated voltage as speed increases. A maximum line voltage of 250 V RMS is permitted, and the embedded resolver supplies rotor position data to the controller. The rotor inertia of 0.00488 kg-m² supports rapid acceleration while helping the axis remain stable during speed changes. The square housing also supports rigid mounting in systems that need accurate mechanical alignment.

For transient demands, the motor can generate 130.0 N-m of peak torque when the amplifier provides a momentary phase current of 81.0 A RMS. These short-term ratings let the axis overcome static friction, absorb load spikes, or decelerate masses within strict cycle-time limits. The mechanical envelope sustains continuous operation up to 2000 RPM, balancing magnetic heating with centrifugal stresses. Weighing 36 kg, the assembly provides substantial thermal mass that helps slow temperature rise during changing load conditions. This overload capability is useful in indexing moves and other applications where brief acceleration peaks are higher than the steady running load.