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- Siemens 1FK7105-2AC71-1QB0 SIMOTICS S 1FK7-CT 48 Nm 2000 rpm Servo Motor with Brake Siemens 1FK7105-2AC71-1QB0 SIMOTICS S 1FK7-CT 48 Nm 2000 rpm Servo Motor with Brake
Siemens 1FK7105-2AC71-1QB0 SIMOTICS S 1FK7-CT 48 Nm 2000 rpm Servo Motor with Brake
Siemens 1FK7105-2AC71-1QB0 SIMOTICS S 1FK7-CT 48 Nm 2000 rpm Servo Motor with Brake
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- Description
The Siemens 1FK7105-2AC71-1QB0 is a SIMOTICS S 1FK7-CT synchronous servo motor rated at 7.7 kW with a 48 Nm standstill torque at 2000 rpm nominal speed. It runs from a 600 V DC bus, mounts in IM B5 (IM V1, IM V3) configuration with Flange 1, carries a Drive-CLiQ absolute single-turn 20-bit encoder (AS20DQI), IP64 protection, and includes an integrated holding brake.
Technical Specifications
| SKU | 1FK7105-2AC71-1QB0 |
| Brand | Siemens |
| Series | SIMOTICS S |
| Product Designation | 1FK7-CT |
| Rated Power | 7.7 kW |
| DC Bus Voltage | 600 V |
| Standstill Torque (100K) | 48 Nm |
| Nominal Speed | 2000 rpm |
| Optimum Speed | 2000 rpm |
| Number of Poles | 8 |
| Rated Current | 16.0 A |
| Moment of Inertia | 162.000 kgcm2 |
| Efficiency | 93.0% |
| Torque Constant | 2.37 Nm/A |
| Voltage Constant at 20C | 157.5 V/1000 rpm |
| Winding Resistance at 20C | 0.17 ohm |
| Rotating Field Inductance | 4.5 mH |
| Electrical Time Constant | 25.50 ms |
| Mechanical Time Constant | 1.40 ms |
| Thermal Time Constant | 70 min |
| Shaft Torsional Stiffness | 95,000 Nm/rad |
| Net Weight | 43.5 kg |
| Shaft Height | 100 mm |
| Cooling | Natural cooling |
| Radial Runout Tolerance | 0.050 mm |
| Concentricity Tolerance | 0.10 mm |
| Axial Runout Tolerance | 0.10 mm |
| Degree of Protection | IP64 |
| Housing Color | Anthracite, RAL 7016 |
| Encoder | Absolute, single-turn, 20-bit, Drive-CLiQ (AS20DQI) |
| Mounting Design | IM B5 (IM V1, IM V3), Flange 1 |
| Power Connector | Rotatable |
| Holding Brake | With |
Selection Notes
This QB0 variant adds an integrated holding brake to the 48 Nm / 2000 rpm winding in this frame, so it holds position on a vertical or overhung-load axis when drive power is removed; where a brake is not required, the brake-less version in the same frame is the lighter option. The brake raises moment of inertia to 162.000 kgcm2 and lowers shaft torsional stiffness to 95,000 Nm/rad compared with the same winding without a brake, both of which factor into servo loop tuning. The 20-bit single-turn Drive-CLiQ encoder (AS20DQI) gives absolute position feedback without a separate battery-backed multi-turn module.