B-404-C-21 Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
The Kollmorgen B-404-C-21 is part of the Goldline B and BH Motors series and has a rated power of 5.4 kW with a maximum speed of 5000 RPM. It provides a continuous stall torque of 13.1 Newton-meters and peak stall torque of 24.1 Newton-meters. The motor features a face square of 115 mm and a shaft diameter of 24 mm.
Internal Product Review
The B-404-C-21 is a Kollmorgen Goldline servo motor rated at 5.4 kW with a max speed of 5000 RPM. Continuous stall torque of 13.1 N-m and peak stall torque of 24.1 N-m give this motor impressive low-speed performance for demanding motion applications.
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Product Description:
The B-404-C-21 is a brushless servo motor manufactured by Kollmorgen within the Goldline B and BH Motors series. It provides rotary actuation for positioning tables, conveyors, and other motion axes in automated equipment. The motor has a 115 mm face square frame, while a 110 mm pilot diameter and a 130 mm mounting bolt circle align the flange to standard gearboxes or machine plates. A 24 mm diameter shaft that extends 20 mm beyond the face transfers torque directly to couplings or pulleys.
The motor can sustain 13.1 N·m of stall torque without exceeding its thermal limits, allowing heavy loads to remain locked in position under servo control. At rated speed, the shaft can deliver 5.4 kW of mechanical power, supporting rapid throughput in high-cycle machinery. A back electromotive force constant of 40.2 VRMS/kRPM must be matched by the drive so that generated voltage stays within the inverter’s DC bus range. The rotor may spin up to 5000 RPM, above which bearing life and insulation stress are not guaranteed. Current-loop design is simplified by the 0.66 N·m/Arms torque coefficient, while a phase-to-phase resistance of 0.34 Ω contributes to steady-state copper losses.
Short-duration overloads are handled by a peak stall capability of 24.1 N·m, giving the axis reserve torque for acceleration spikes or external shocks. Acceleration response is aided by a rotor inertia of 0.000656 kg·m², which permits quick speed changes without causing servo instability when coupled to moderate load inertias. The winding’s line-to-line inductance of 8.4 mH limits di/dt, so the drive must supply adequate voltage during fast current transitions. For thermal protection, an embedded switch changes state at 132 °C and changes state again near 170 °C. This thermal device helps protect the insulation and magnet materials during overload conditions.
