Product Description:

The B-604-BA-91-TR12-008 is a brushless servo motor manufactured by Kollmorgen as part of the Kollmorgen Goldline B and BH Motors series. In a multi-axis automation cell, this motor converts drive current into controlled rotary motion for indexing tables, gantry joints, and packaging axes that require repeatable speed and torque. Its electromechanical design matches Goldline drives, allowing rapid acceleration while maintaining position feedback through a resolver or optional tachometer assemblies.

In nominal operation, the unit supplies 7.7 kW of mechanical output while turning at 3150 rpm. To maintain this level, it draws a continuous phase current of 27.7 A RMS and can hold a shaft load with 30.1 N·m of stall torque at 40 °C winding temperature. The winding set presents 0.234 Ω of DC resistance and stores energy in a 6.3 mH inductive coil, values that influence current rise time and drive tuning. A back electromotive force constant of 65.9 VRMS/kRPM links speed to generated voltage, helping the controller estimate velocity without an encoder. Thermal energy moves from the stator to the frame through 0.28 °C/W of thermal resistance, limiting steady-state temperature under rated load.

For short transients, the motor withstands a line surge of 84.8 A RMS and produces up to 87.7 N·m of peak torque before magnetic saturation. The laminated steel rotor carries 0.002034 kg·m² of inertia, allowing fast reversal without excessive overshoot. The motor is rated IP65, so dust ingress and water jets do not reach the internal windings during washdown cycles. When a resolver is installed, the assembly adds 71.1 mm to the overall length, while a tachometer increases length by 54.3 mm and introduces only 0.6% average-to-peak ripple on the speed signal. A 33-minute thermal time constant provides a gradual temperature rise, giving the drive time to react to overload events.