Product Description:

The B-404-C-31 servo motor is manufactured by Kollmorgen and belongs to the Kollmorgen Goldline B and BH Motors series. It is an AC brushless unit intended for closed-loop motion systems where consistent torque, rapid acceleration, and repeatable positioning are required in machining centers, pick-and-place gantries, and similar industrial automation platforms. At rated electrical conditions, the motor delivers 5.4 kW of mechanical power, making it suitable for mid-range servo drives that require high bandwidth and low inertia coupling.

This model draws a continuous phase current of 19.8 Arms. This rating indicates the steady-state current the drive must supply without exceeding winding temperature limits. Under that excitation, it can hold a load at a continuous stall torque of 13.1 N-m, allowing machinery to maintain position against static loads. The copper windings have a DC resistance of 0.34 ohms, which helps reduce I²R losses and improve thermal efficiency. A maximum input of 250 Vrms line-to-line sets the insulation requirement for the drive cable and marks the upper boundary of mechanical output. The 8.4 mH phase inductance, 40.2 Vrms/kRPM back-EMF constant, and 0.66 N-m/Arms torque constant affect current loop tuning and voltage use, while also limiting very rapid current changes that could increase torque ripple.

The design reaches a rated speed of 5000 rpm, which supports direct coupling to ball screws or belt stages without intermediate gearing. For short-duty bursts, it withstands a peak torque of 35.3 N-m while the drive may momentarily supply 55.9 Arms. Rotor inertia is only 0.000656 kg·m², enabling fast acceleration profiles with limited reflected load. Thermal saturation is modeled by a time constant of 25 min, so intermittent overloads can be tolerated before the motor reaches its 0.38 °C/W thermal resistance limit. The motor weight of 12.5 kg provides mounting stiffness and damping without placing excessive load on linear or rotary axes.