Siemens 1FK7100-2AF71-1QB0 SIMOTICS S 1FK7-CT 18Nm 3.8kW Servo Motor

The Siemens 1FK7100-2AF71-1QB0 is a SIMOTICS S 1FK7-CT synchronous servo motor rated 18 Nm standstill torque (M0) at 8.0 A rated current, with a naturally cooled IMB5 design, an absolute single-turn 20-bit Drive-CLiQ encoder, an integrated holding brake, and IP64 protection. Optimum speed is 3,000 rpm with a shaft height of 100 mm and a torque constant of 1.62 Nm/A.

Technical Specifications

Selection Notes

The 1QB0 configuration adds an integrated holding brake and a feather-key shaft (tolerance N) to the base 1FK7100-2AF71 motor, so it holds position on a vertical or overhung load when drive power is removed, pick it over a brakeless variant whenever the axis must not drift at standstill. At 18 Nm standstill torque and 8.0 A rated current with a 22.50 ms electrical time constant, it suits mid-range single-axis positioning rather than the smaller or larger frame sizes in the 1FK7 line. The 20-bit single-turn Drive-CLiQ encoder gives absolute position feedback without a battery-backed multi-turn option, so an external reference or homing move is still needed after more than one revolution of travel.

Applications

Suited to single-axis servo positioning where a vertical or gravity-loaded axis needs to hold position without drive power, such as lift and gantry axes, rotary indexers, and machine tool feed axes controlled over Drive-CLiQ from a SINAMICS drive.