B-604-B-21-B3E1 by Kollmorgen

The B-604-B-21-B3E1 is a brushless servo motor engineered by Kollmorgen and placed within the Kollmorgen Goldline B and BH Motors series. As a rotary actuator, it converts drive current into precisely regulated shaft torque and speed, allowing CNC tables, pick-and-place heads, and other automated stations to position loads under closed-loop control. Integration is simplified by a built-in permanent-magnet rotor and a factory-mounted fail-safe brake for power-off holding.

For continuous operation at a 25 °C winding temperature, the motor sustains a torque of 31.8 N-m, while the torque drops to 30.1 N-m when the winding reaches 40 °C. Delivering that output requires a continuous current of 27.7 A RMS, which helps guide drive sizing and conductor selection. At a rated speed of 3150 rpm, the motor can generate a mechanical output of 7.7 kW, making it suitable for mid-power motion axes. The electrical characteristics include a phase-to-phase inductance of 6.3 mH and a DC resistance of 0.234 ?, which influence current response and copper losses. The motor constant is 1.94 N-m/W, showing how efficiently electrical input is converted into continuous torque during steady-state operation. Peak shaft speed must stay within the permitted operating limit, so overspeed detection in the drive software remains important.

During dynamic moves, the motor can supply a peak torque of 87.7 N-m for rapid acceleration, provided the drive can furnish a peak current demand of 84.8 A RMS without exceeding thermal limits. The embedded holding brake supplies 48.0 N-m of static torque and operates from 24 VDC, helping prevent load drift when power is removed. System responsiveness benefits from a rotor inertia of 0.002034 kg·m², which helps keep settling times short during indexing moves. Overall mass is 23.1 kg, a consideration for gantry or robot arm mounting.