Product Description:

The B-204-A-31-B3 is a servo motor produced by Kollmorgen within the Kollmorgen Goldline B and BH Motors series. This AC motor is intended for position and speed control tasks in industrial automation, where it converts electrical energy into regulated mechanical torque for actuators, machine tools, and coordinated multi-axis platforms. It is well suited to closed-loop motion systems that need repeatable response during indexing, feeding, and synchronized axis movement.

The motor is designed for operation from a single-phase or three-phase supply at 115 VAC, and this operating voltage affects insulation and drive interface requirements. Under continuous stall conditions, it can deliver 4.47 N·m without exceeding rated temperature, which supports steady holding torque and low-speed feed moves. Its mechanical output is limited by a thermal rating of 440 W, so heat dissipation must be managed by suitable mounting and airflow. The electromagnetic design yields a torque constant of 1.66 N·m/Arms, allowing drive current to be related directly to commanded torque. With an armature inductance of 133 mH, current rise is moderated, which helps reduce ripple and eases loading on the power stage during PWM switching. These electrical characteristics affect servo loop tuning, acceleration behavior, and overall system bandwidth.

Dynamic response is also influenced by a rotor inertia of 0.000173 kg·m², which supports rapid speed changes when the motor is paired with moderate load inertias. For vertical or safety-critical axes, the integrated fail-safe brake can apply 6.0 N·m of holding torque when 24 VDC is removed from the brake coil, which normally draws 1.27 A, helping prevent back-driving after power loss. Peak motion demands are accommodated by a ceiling of 12.8 N·m, which can be used for short acceleration bursts before thermal limits intervene. This combination suits applications that need quick acceleration, controlled stopping, and reliable holding when the axis is at rest.