Product Description:

The 6SM 77K-3.000-G is a three-phase synchronous servo motor produced by Kollmorgen within the 6SM Synchronous Servo Motors series. Designed for closed-loop motion systems, the unit converts controlled stator currents into precise shaft torque and speed, allowing automated machinery to position loads quickly and repeatedly. Its integrated electromagnetic brake permits secure holding when power is removed, while the mechanical bearings and shaft interface accept both axial and radial forces encountered in industrial linear or rotary axes.

Under continuous operation, the motor delivers a shaft output of 2.7 kW at a nominal speed of 3000 rpm, drawing 5 A of phase current to produce 8.5 Nm of torque. For short acceleration bursts, the drive can supply up to 24 A, increasing mechanical output during indexing moves. The stator coils have a phase resistance of 2.2 Ω, and the bearings tolerate radial forces up to 730 N and axial forces up to 210 N, permitting belt tension or thrust loads directly on the shaft. An integrated holding brake engages at 24 V DC to keep the load stationary when the amplifier is disabled.

During positioning tasks, the motor must resist motion without rotating. At zero speed, it can exert 11 Nm of holding torque while drawing a standstill current of 6 A. The laminated rotor has an inertia of 12 kg·cm², balancing quick step responses with stable tracking. The winding has an inductance of 18 mH, which works with the drive’s PWM frequency to shape the current-loop bandwidth. The electromagnetic design provides a torque constant of 1.85 Nm/A, and the generated back EMF follows a slope of 112 V per 1000 rpm, giving the controller predictable voltage margins across the speed range. Initial movement must overcome 0.25 Nm of static friction torque, after which the sinusoidal current profile maintains smooth rotation.