Product Description:

The B-204-B-21-B2 is a brushless servo motor built by Kollmorgen within the Kollmorgen Goldline B and BH Motors series. This motor supplies tightly regulated torque and speed so that automated pick-and-place axes, conveyors, and indexing tables can follow controller commands with minimal position error and cycle-to-cycle drift. Its electromechanical design aligns with drive platforms that use sinusoidal commutation and resolver or encoder feedback for closed-loop motion tasks on factory floors.

The motor draws a continuous phase current of 5.3 A RMS to produce its continuous stall torque of 4.47 N-m and is wound to deliver a back electromotive force of 51.2 Vrms/kRPM, which indicates the voltage the drive must overcome per 1000 rpm of shaft speed. Mounting is simplified by a 100.00 mm bolt circle, allowing the frame to mate to standard gearboxes or machine plates. Under rated excitation, it outputs 1.6 kW while spinning at 3600 rpm, and this power-speed point helps with drive sizing and thermal calculations. A torque constant of 0.85 N-m/A RMS links commanded current to produced torque, while 38.0 mH of phase inductance and 2.48 Ω of DC resistance are tied to the motor’s electrical time constant and copper losses. The 14.00 mm shaft diameter supports standard keyed couplings and helps minimize torsional compliance in the power path.

An integral permanent-magnet brake is energized by 90 V DC. It requires only 0.39 A to release but can hold up to 6.0 N-m when de-energized, preventing load back-drive during power removal. For short duty surges, the winding can accept a peak current of 17.2 A RMS, enabling the rotor to generate a peak torque of 13.8 N-m for rapid acceleration or shock load absorption during transient moves without exceeding thermal limits.