Product Description:

The B-204-B-39-023 is a brushless servo motor manufactured by Kollmorgen and included in the Kollmorgen Goldline B and BH Motors series. This unit serves as a prime mover in industrial automation, where it delivers repeatable rotary positioning under feedback control. A four-pole rotor and rare-earth magnet assembly enable synchronous operation with matched digital drives, making the motor suitable for packaging, electronic assembly, and material-handling axes.

Electrical operating limits govern the motor-drive interface. The continuous phase current is 5.3 A RMS, a value that the drive must supply indefinitely without causing thermally induced demagnetization. At the rated mechanical speed of 3600 RPM, the windings generate a back electromotive force of 51.2 VRMS/kRPM, so the drive’s DC bus must accommodate that voltage while maintaining commutation margin. Copper loss is governed by a winding resistance of 2.48 Ohms, and the stored magnetic energy is related to a leakage inductance of 38.0 mH. Together with the specified 250 V RMS maximum line input, these values set the dynamic current rise time and the voltage headroom needed for field-oriented control.

Mechanical and thermal ratings shape axis sizing. The motor can hold a load at stall with 4.47 N·m of continuous torque, yet deliver up to 13.8 N·m for short transients when fed with the allowable 17.2 A RMS peak current. Within the rated power envelope of 1.6 kW, efficiency is indicated by a motor constant of 0.464 N·m/W and a torque sensitivity of 0.85 N·m/A RMS. Rotor inertia is 0.0001729 kg·m², supporting rapid acceleration with minimal overshoot. Heat produced by copper and iron losses leaves the frame through a thermal resistance of 0.73 °C/W, and the 20-minute thermal time constant shows how fast winding temperature approaches steady state during load changes.