Siemens 1FK7042-3BK71-1CG0 Simotics Servo Motor

Siemens SIMOTICS S synchronous servo motor 1FK7042-3BK71-1CG0 is a compact, two‑pole servo designed for precise torque and speed control within SINAMICS S120 systems. It is rated for 0.94 kW of continuous power at 600 V DC, with a rated speed of 6,000 rpm and a continuous torque of 1.5 Nm at the 100K rating, along with a stall torque of 3 Nm and a maximum torque of 10.5 Nm for short bursts. The unit weighs about 5.1 kg (5.8 kg with a brake) and uses a natural‑convection IMB5 enclosure with flange 1 and a rotatable power connector for flexible installation. It includes a rotatable absolute encoder; CG0 variants employ a 24‑bit single‑turn encoder plus a 12‑bit multi‑turn memory (AM24DQI) accessed via DRIVE‑CLiQ, enabling reliable position feedback across power cycles. Electrical data list winding resistance around 1.145 Ω and inductance about 8.6 mH, with an electrical time constant near 7.5 ms and a mechanical time constant around 3.8 ms, supporting quick dynamic response in closed‑loop control. In typical SINAMICS drive configurations, the motor has a rated inverter current of 5 A and a maximum inverter current of 10 A, providing a scalable range from precise micro‑positioning to higher‑torque operation. This SIMOTICS S motor is commonly used in automation, robotics, packaging, and machine tooling where repeatable motion, stable torque, and accurate feedback are essential for reliable, high‑performance operation.