Product Description:

The B-206-B-21 is a brushless servo motor produced by Kollmorgen within the Kollmorgen Goldline B and BH Motors series. This permanent-magnet unit converts commanded current into controlled torque and velocity for positioning tasks in industrial automation systems such as packaging axes, pick-and-place gantries, and machine tool spindles. By combining rare-earth magnets with stator windings optimized for low thermal rise, the motor supplies closed-loop motion precision where compact size and repeatable dynamics are required.

During steady operation, the frame supports a continuous electromagnetic load of 6.24 N-m while drawing only 5.8 A RMS at stall. These figures reflect the copper loss limits of the stator lamination and integral thermistor network. The electromagnetic coupling is characterized by a 1.08 N-m/A RMS torque constant, so drive current commands translate predictably into shaft torque for tight proportional loops. At speed, the winding generates a counter-voltage of 65.1 VRMS/kRPM, a value used by the drive to calculate voltage margin at the intended bus level. The phase inductance is 32 mH, which filters current ripple and lets the amplifier use high-frequency PWM without excessive distortion.

For dynamic events, the rotor withstands short bursts up to 19.9 N-m while the drive can supply 19.5 A RMS for acceleration or disturbance rejection. These transient limits are bounded by the laminated core saturation point and by the rotor inertia of 0.000251 kg-m², which balances quick response with mechanical stability. The motor is optimized to run at a nominal 2800 RPM, where it delivers mechanical power close to 1.80 kW and maintains efficiency within the series target. Thermal behavior includes a 0.65 °C/W path from winding to housing and a 21-minute thermal time constant, allowing moderate overload before reaching rated temperature. With a 250 VRMS line-to-line ceiling and a four-pole rotor, the unit integrates directly with Kollmorgen Servostar drives while keeping overall mass to 7.6 kg for simplified axis sizing.