Product Description:

The B-202-A-21-S is a brushless servo motor built by Kollmorgen as part of the Goldline B and BH Motors series. Intended for industrial automation, the motor receives three-phase current from a drive and produces commanded shaft torque for indexing tables, pick-and-place heads, and light material-handling stages. Tight manufacturing tolerances and sealed construction help it maintain accuracy in washdown or high-humidity areas.

Electrical behavior includes a back electromotive force of 79.5 VRMS/kRPM; the higher this constant is, the more voltage the controller must supply as speed rises. Steady-state operation draws a line current of 1.70 A RMS while remaining below the maximum line voltage of 250 VRMS available from typical Goldline drives. Winding inductance is 185.0 mH, which slows current transients and reduces torque ripple. Under rated conditions, the motor delivers 0.60 kW of mechanical power at a shaft speed of 2500 rpm. Copper resistance measures 17.7 Ω and contributes to I²R losses. Stall torque reaches 2.39 N·m at 25 °C and 2.25 N·m at 40 °C.

For short bursts, the drive may apply a peak current of 6.0 A RMS, which lets the rotor develop a peak torque of 7.45 N·m during acceleration or disturbance rejection. Torque scales linearly with excitation due to a constant of 1.32 N·m/A RMS, simplifying loop-gain calculations. A rotor inertia of 9.96 × 10⁻⁵ kg·m² provides a quick response without excessive overshoot. The Viton shaft seal gives the housing an ingress protection rating of IP67, protecting internal laminations against coolant splashes and temporary immersion. The minimum flying-lead length is 457 mm, facilitating direct connection to cabinet terminals. The absence of a rear shaft extension permits a compact mounting depth while preserving concentricity under dynamic loads.