VFD vs Servo Drive: Key Differences
A side-by-side comparison of VFD and servo drive motor type, feedback, dynamic response, overload rating, cost, and applications for industrial engineers.
- Part number
- 1FK7100-2AF71-1QA0
SIMOTICS SSiemens 1FK7100-2AF71-1QA0 SIMOTICS S 1FK7-CT 3.8 kW 18 Nm 3000 rpm Servo Motor
SIMOTICS S 1FK7-CT synchronous servo motor, 3.8 kW / 18 Nm at 3000 rpm, IP64, DRIVE-CLiQ absolute encoder.
Description
About the 1FK7100-2AF71-1QA0
About the 1FK7100-2AF71-1QA0
The Siemens 1FK7100-2AF71-1QA0 is a SIMOTICS S 1FK7-CT synchronous servo motor rated 3.8 kW, delivering 18 Nm standstill torque (M0, 100K duty) at a 3000 rpm rated speed with an 8-pole, 8.0 A design. It is naturally cooled, IMB 5 flange-mounted, and fitted with an absolute single-turn 20-bit encoder on a DRIVE-CLiQ interface, IP64-rated, without a holding brake.
Selection Notes
The -2AF71 code sets this motor to a 3000 rpm rated speed within the 1FK7-CT line, the higher-speed winding compared with the -2AC71 version rated to 2000 rpm at the same 18 Nm standstill torque; here the higher rated speed lifts rated power to 3.8 kW even though the standstill torque is unchanged. The -1QA0 suffix means no integrated brake, keeping moment of inertia at 54.0 kgcm2 and weight at 17.6 kg, lower than the brake-equipped configuration in this frame, and keeping the 2.00 ms mechanical time constant as fast as this design allows. Choose this non-brake configuration for horizontal axes or where an external holding mechanism already covers power-off retention; for vertical or gravity-loaded axes, a holding-brake version of this motor is the safer choice. The 183,000 Nm/rad torsional stiffness and 7.3 mH rotating field inductance support stiff, high-bandwidth loops at the 3000 rpm rated speed.
Specification
Full specification
Engineering data 10
| Rated speed (100 K) | 3,000 rpm |
|---|---|
| Number of poles | 8 |
| Rated torque (100 K) | 12.0 Nm |
| Rated current | 8.0 A |
| Static torque (60 K) | 14.90 Nm |
| Static torque (100 K) | 18.00 Nm |
| Stall current (60 K) | 9.00 A |
| Stall current (100 K) | 11.10 A |
| Moment of inertia | 54.000 kgcm² |
| Efficiency | 92.0 % |
Physical constants 9
| Torque constant | 1.62 Nm/A |
|---|---|
| Voltage constant at 20º C | 104.5 V/1000*min¯¹ |
| Winding resistance at 20º C | 0.32 Ω |
| Rotating field inductance | 7.3 mH |
| Electrical time constant | 22.50 ms |
| Mechanical time constant | 2.00 ms |
| Thermal time constant | 55 min |
| Shaft torsional stiffness | 183,000 Nm/rad |
| Net weight of the motor | 17.6 kg Permanent-magnet synchronous |
Mechanical data 16
| Motor type | motor Compact |
|---|---|
| Shaft height | 100 |
| Cooling | Natural cooling |
| Radial runout tolerance | 0.050 mm |
| Concentricity tolerance | 0.10 mm |
| Axial runout tolerance | 0.10 mm |
| Vibration severity grade | Grade A |
| Connector size | M23 |
| Degree of protection | IP64 |
| Design acc. to Code I | IM B5 (IM V1, IM V3) |
| Temperature monitoring | Pt1000 temperature sensor |
| Electrical connectors | Connectors for signals and power rotatable |
| Color of the housing | Standard (Anthracite RAL 7016) |
| Holding brake | without holding brake |
| Shaft end | Feather key |
| Encoder system | Encoder AS20DQI: absolute encoder single-turn 20 bits |
Show all 54 specifications ↓ Show less ↑19 more values in Identification, Optimum operating point, Limiting data, Recommended Motor Module, Logistics.
Identification 5
| Part number | 1FK7100-2AF71-1QA0 |
|---|---|
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
Optimum operating point 2
| Optimum speed | 3,000 rpm |
|---|---|
| Optimum power | 3.8 kW |
Limiting data 4
| Max. permissible speed (mech.) | 5,000 rpm |
|---|---|
| Max. permissible speed (inverter) | 5,000 rpm |
| Maximum torque | 55.0 Nm |
| Maximum current | 37.0 A |
Recommended Motor Module 4
| Rated inverter current | 18 A |
|---|---|
| Maximum inverter current | 54 A |
| Maximum torque | 55.00 Nm |
| Page 1 of 1 | Generated Sun Nov 1 02:24:09 CET 2026 |
Logistics 4
| Shipping weight | 19.601 kg |
|---|---|
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 01 Nov 2026
Documents
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Quick answers
Questions about the 1FK7100-2AF71-1QA0
What is the rated current of 1FK7100-2AF71-1QA0?
The rated current of 1FK7100-2AF71-1QA0 is 8.0 A.
What motor power is 1FK7100-2AF71-1QA0 rated for?
The rated motor power of 1FK7100-2AF71-1QA0 is 3.8 kW.
What is the HS code of 1FK7100-2AF71-1QA0 for customs?
The tariff (HS) code on file for 1FK7100-2AF71-1QA0 is 85015220.
Where does 1FK7100-2AF71-1QA0 ship from, and how fast?
1FK7100-2AF71-1QA0 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
Guides
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Series
Siemens SIMOTICS S
- Brand
- Siemens
- Series
- SIMOTICS S
