Product Description:

The BH-626-E-99-251 servo motor is produced by Kollmorgen and belongs to the Kollmorgen Goldline B and BH Motors series. This three-phase brushless unit is intended for precision positioning and velocity control in automated machinery, where torque density and rapid response are required to drive axes, actuators, or web-handling rolls. By supplying feedback-ready mechanical power in a sealed frame, the motor integrates with Kollmorgen drives to form a closed-loop system that maintains commanded motion profiles under variable load.

The motor can deliver a continuous shaft torque of 35.4 N-m while holding temperature rise within its design limits; this figure indicates the sustained load the axis can carry without overheating. To achieve that output it draws a continuous current of 19.7 Arms from the drive. The electromagnetic coupling efficiency is reflected in a torque constant of 1.8 N-m/Arms, so each ampere contributes nearly two newton-meters. A back-electromotive-force constant of 109 Vrms/kRPM characterizes the voltage generated per thousand revolutions and is useful for sizing the bus voltage. Winding impedance is governed by an inductance of 10.7 mH and a DC resistance of 0.43 ohms; together these values influence current loop bandwidth and dissipative losses.

For transient events such as acceleration and shock loads, the motor can supply up to 126 N-m of peak torque while accepting a momentary phase current of 73.8 Arms. A rotor inertia of 0.00304 kg-m² moderates speed changes, providing a balance between quick settling and load matching for servo stability. Six magnetic poles support smooth sinusoidal commutation, and the 142 mm diameter frame houses a 436.4 mm stack that weighs 29.9 kg. A 32 mm shaft diameter with a 50 mm extension transmits power, and a 38-minute thermal time constant provides predictable temperature rise during intermittent duty cycles.