Product Description:

Kollmorgen manufactures the B-204-A-29-004 as part of its Goldline B and BH Motors series. This brushless servo motor is applied in industrial automation where precise velocity and position control are required for indexing tables, pick-and-place heads, or coordinated machine axes. By pairing with a compatible digital drive, it produces repeatable torque across a wide speed band so mechanical loads can be moved, held, or synchronized with minimal position error.

The motor delivers a continuous stall torque of 4.47 N-m while drawing only 2.9 Arms because the windings are optimized for thermal efficiency. A torque constant of 1.66 N-m/Arms links commanded phase current directly to output torque, allowing the control system to calculate current setpoints without extensive calibration. The back electromotive-force constant is 100.5 Vrms/kRPM; this value sets the generated voltage during regeneration and influences the maximum safe speed on a given DC bus. Internally, heat produced by copper and iron losses exits the frame through a thermal path rated at 0.74 °C/W, so housing temperature can be estimated under continuous loading. The 133 mH phase inductance filters inverter switching edges, and the 9.46 Ω resistance limits short-duration fault currents, while the four-pole rotor geometry establishes magnetic symmetry for smooth rotation.

For transient moves, the motor can withstand a peak stall torque of 12.8 N-m at a momentary current of 8.1 Arms, giving machinery reserve force for acceleration or disturbance rejection. During normal operation, the windings support a rated mechanical output of 440 W, corresponding to a rated torque of 4.42 N-m at approximately 950 rpm. The low rotor inertia of 0.000173 kg-m² enables rapid start-stop cycles and tight following of dynamic command profiles without overshoot. A 21-minute thermal time constant means temperature rises slowly, so the motor tolerates short overloads before reaching thermal limits.