Product Description:

The B-604-B-21 is a brushless servomotor built by Kollmorgen for the Goldline B and BH Motors series. This model supplies rotary actuation for positioning tables, gantries, and other industrial automation axes that require rapid torque production and tight velocity control. It converts three-phase AC power into mechanical output through permanent-magnet excitation and is sized for medium-to-high power motion tasks on packaging or material-handling lines. The brushless design also supports smooth response during repeated acceleration and deceleration cycles.

Under nominal load, the motor delivers a rated speed of 3150 RPM while producing a rated torque of 23.34 N-m. These values correspond to a mechanical output of 7700 W. The winding is designed for a line supply of 230 VAC and draws a continuous stall current of 27.7 Arms when the shaft is locked. During continuous stall, the motor can hold load without exceeding its thermal limit, and the torque constant shows how phase current relates to shaft output. Electrical characteristics include a 0.23 ohm resistance at 25 °C and an inductance of 6.3 mH, which affect current rise and drive tuning. A back-emf constant of 65.85 Vrms/kRPM sets the generated voltage during regeneration.

For short bursts, the winding accepts a peak stall current of 84.8 Arms and can generate a peak stall torque of 87.7 N-m, enabling fast acceleration of loads. Rotor dynamics are influenced by a moment of inertia of 0.00203 kg-m², which balances responsiveness with stable speed control when the load changes quickly. Heat moves from the frame to ambient through a thermal resistance of 0.28 °C/W. The motor mass is 23.1 kg, and its thermal time constant is 33 minutes. This thermal behavior allows the motor to absorb short overload events before reaching steady-state temperature.