Siemens 1FK7081-2AF71-1QA0 SIMOTICS S 1FK7-CT 2.7 kW 12 Nm 3000 rpm Servo Motor

The Siemens 1FK7081-2AF71-1QA0 is a SIMOTICS S 1FK7-CT synchronous servo motor rated 2.7 kW with 12 Nm standstill torque at 100K and a 3,000 rpm rated speed. It runs on a 600 V DC link, uses natural cooling, and carries an IP64 enclosure with an absolute 20-bit single-turn DRIVE-CLiQ encoder (AS20DQI). This variant ships without a holding brake.

Technical Specifications

Selection Notes

Without a holding brake, this 1FK7-CT variant fits horizontal axes where an external mechanical stop or the drive's controlled ramp-down covers the standstill condition. The 20.000 kgcm² rotor inertia and 1.35 ms mechanical time constant favor point-to-point moves that need fast direction reversals over high top speed. At 3,000 rpm rated speed the 12 Nm standstill torque holds up to roughly 3.8 kW at rated point, so size the drive's current limit around the 6.8 A rated current rather than the motor frame alone.

Applications

Typical use: pick-and-place and indexing axes on packaging and assembly lines, and any SINAMICS S120/S210 DRIVE-CLiQ axis where a compact 80 mm flange servo motor with 12 Nm standstill torque matches the load.