Product Description:

The B-202-B-21-B3 is a brushless servo motor produced by Kollmorgen within the Kollmorgen Goldline B and BH Motors series. It is intended for closed-loop industrial automation axes where accurate position, velocity, and torque control are required, such as indexing tables or coordinated gantry stages. Kollmorgen integrates an electromagnetic holding brake into this model so loads can be secured when power is removed.

The motor can deliver a continuous torque of 2.44 N-m while drawing a continuous line current of 3 Arms, allowing sustained load support without thermal derating. For short transients, it withstands a peak stall torque of 7.38 N-m and a peak stall current of 9.6 Arms, giving extra headroom during acceleration or impact disturbances. Coil inductance is 68 mH, so current ramps are moderated, simplifying tuning of current loops and reducing conducted EMI. These electrical limits affect drive amplifier sizing and the achievable servo bandwidth.

A back-electromotive-force constant of 49 Vrms/kRPM shows the relationship between speed and generated voltage, which is useful when selecting DC-bus levels that avoid inverter saturation. The assembly weighs 4.1 kg, which affects mounting structure stiffness and overall moving mass in machines with flying leads. Thermal management is aided by a thermal time constant of 18 min and a thermal resistance of 0.81 °C/W, indicating how quickly temperature rises during load changes and how effectively heat is transferred to ambient. The integral brake produces 6.0 N-m of static torque, is energized at 24 VDC, and draws 1.27 A. Rotor inertia of 0.0000996 kg·m², combined with a brake inertia of 0.00000247 kg·m², affects the mechanical response to command steps, while a torque constant of 0.81 N-m/Arms and a DC resistance of 6.98 Ω affect copper losses during continuous operation.