Siemens 1FK7042-2AC71-1QB0 SIMOTICS S-1FK7 1FK7-CT 0.59kW 3Nm 2000rpm Servo Motor

The Siemens 1FK7042-2AC71-1QB0 is a SIMOTICS S-1FK7 (1FK7-CT) permanent-magnet synchronous servo motor rated 0.59 kW at 2,000 rpm, delivering 3 Nm standstill torque (M0, 100K) from a 600 V DC link. It integrates a holding brake, carries a single-turn 20-bit DRIVE-CLiQ absolute encoder (AS20DQI), and is naturally cooled in a shaft height 48, IMB 5 (IM V1/V3) housing rated IP64.

Technical Specifications

Selection Notes

This is the same 600 V / 2,000 rpm winding as the brake-free variant of this frame, but with an integrated holding brake — weight rises from 4.6 to 5.3 kg and shaft torsional stiffness drops from 15,500 to 11,400 Nm/rad. Fit it on vertical or overhung axes where the load must stay in place the instant drive power is removed; on purely horizontal axes with no gravity load, the brake-free winding saves weight and keeps the higher torsional stiffness for tighter positioning loops. The same 1.86 Nm/A torque constant and 7.40 ms electrical time constant apply regardless of the brake.

Applications

Used as the servo motor in vertical or overhung single- or multi-axis machine motion — Z-axes, lift stations, and gravity-loaded pick-and-place arms — driven through a DRIVE-CLiQ-based servo drive via the AS20DQI single-turn absolute encoder interface. The integrated holding brake keeps the axis in position when drive power drops out or during an E-stop, without relying on the drive's active current to hold load.