1FK7044-4CH71-1RH0 Siemens

Description

The Siemens SIMOTICS S-1FK7 servo motor, model 1FK7044-4CH71-1RH0, is engineered for high-precision and high-dynamic industrial applications requiring fast acceleration, accurate positioning, and robust mechanical design. The motor employs permanent-magnet synchronous technology and belongs to the High Dynamic variant of the 1FK7 series, offering excellent torque density and responsiveness.

Performance & Electrical Characteristics

• Rated speed: 4,500 rpm

• Rated torque: 3.0 Nm

• Rated current: 3.9 A

• Static torque: up to 4.50 Nm (100 K)

• Stall current: up to 5.40 A (100 K)

• Efficiency: 91%

• Torque constant: 0.83 Nm/A

• Voltage constant: 53 V / 1000 rpm

• Inductance: 10.2 mH

• Electrical time constant: 12.5 ms

These values allow the motor to deliver responsive, stable torque with minimal losses, making it suitable for dynamic servo applications.

Mechanical & Physical Data

• Motor type: Permanent-magnet synchronous, High Dynamic

• Cooling: Natural cooling

• Moment of inertia: 1.620 kg·cm²

• Net weight: 8.0 kg

• Shaft: Plain shaft

• Runout tolerances: radial 0.040 mm, concentricity 0.08 mm, axial 0.08 mm

• Vibration grade: A

• Degree of protection: IP64

• Mounting: IM B5 (IM V1, IM V3)

The motor’s mechanical robustness and tight tolerances support smooth operation and long service life.

Encoder System

Equipped with an AM20DQI absolute encoder featuring:

• 20-bit single-turn resolution (1,048,576 steps)

• 12-bit multi-turn (4,096 revolutions)

• Internal 512 S/R
  This ensures extremely precise feedback for motion-control systems.

Holding Brake

• Type: Permanent-magnet brake

• Holding torque: 4.0 Nm

• Supply: 24 V DC, 0.5 A

• Opening time: 70 ms

• Closing time: 30 ms

Operating Limits

• Maximum speed (mechanical & inverter): 9,000 rpm

• Maximum torque: 13.0 Nm

• Recommended inverter: Motor Module with 9 A rated / 27 A max current

Optimum Operating Point

• Speed: 4,500 rpm

• Power output: 1.4 kW