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
- 1FK7103-2AC71-1QA0
SIMOTICS SSiemens 1FK7103-2AC71-1QA0 SIMOTICS S 1FK7-CT 36 Nm 2000 rpm Servo Motor
Siemens 1FK7-CT synchronous servo motor, 36 Nm, 5.2 kW, 2000 rpm, IP64, Drive-CLiQ absolute encoder, no holding brake.
Description
About the 1FK7103-2AC71-1QA0
About the 1FK7103-2AC71-1QA0
The Siemens 1FK7103-2AC71-1QA0 is a SIMOTICS S 1FK7-CT synchronous servo motor rated at 5.2 kW with a 36 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, and carries a Drive-CLiQ absolute single-turn 20-bit encoder (AS20DQI) with IP64 protection and no holding brake.
Selection Notes
This QA0 variant has no holding brake, so on a vertical or overhung-load axis the servo drive or an external brake must hold position when power is removed; where the axis must stay parked without drive power, the version with an integrated holding brake in the same frame is the correct choice. At 36 Nm standstill torque and 2000 rpm nominal speed with an 8-pole winding, this motor suits indexing and pick-and-place axes that need moderate torque rather than the higher continuous power of a larger frame size in this series. The 20-bit single-turn Drive-CLiQ encoder (AS20DQI) gives absolute position feedback without a separate battery-backed multi-turn module.
Specification
Full specification
Engineering data 10
| Rated speed (100 K) | 2,000 rpm |
|---|---|
| Number of poles | 8 |
| Rated torque (100 K) | 25.0 Nm |
| Rated current | 11.0 A |
| Static torque (60 K) | 30.00 Nm |
| Static torque (100 K) | 36.00 Nm |
| Stall current (60 K) | 11.60 A |
| Stall current (100 K) | 14.40 A |
| Moment of inertia | 104.000 kgcm² |
| Efficiency | 93.0 % |
Physical constants 9
| Torque constant | 2.45 Nm/A |
|---|---|
| Voltage constant at 20º C | 162.0 V/1000*min¯¹ |
| Winding resistance at 20º C | 0.29 Ω |
| Rotating field inductance | 7.9 mH |
| Electrical time constant | 27.50 ms |
| Mechanical time constant | 1.43 ms |
| Thermal time constant | 65 min |
| Shaft torsional stiffness | 148,000 Nm/rad |
| Net weight of the motor | 28.5 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 | M40 |
| 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 | 1FK7103-2AC71-1QA0 |
|---|---|
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
Optimum operating point 2
| Optimum speed | 2,000 rpm |
|---|---|
| Optimum power | 5.2 kW |
Limiting data 4
| Max. permissible speed (mech.) | 5,000 rpm |
|---|---|
| Max. permissible speed (inverter) | 3,550 rpm |
| Maximum torque | 108.0 Nm |
| Maximum current | 46.5 A |
Recommended Motor Module 4
| Rated inverter current | 18 A |
|---|---|
| Maximum inverter current | 54 A |
| Maximum torque | 108.00 Nm |
| Page 1 of 1 | Generated Sun Nov 1 02:25:17 CET 2026 |
Logistics 4
| Shipping weight | 30.501 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 1FK7103-2AC71-1QA0
What is the rated current of 1FK7103-2AC71-1QA0?
The rated current of 1FK7103-2AC71-1QA0 is 11.0 A.
What motor power is 1FK7103-2AC71-1QA0 rated for?
The rated motor power of 1FK7103-2AC71-1QA0 is 5.2 kW.
What is the HS code of 1FK7103-2AC71-1QA0 for customs?
The tariff (HS) code on file for 1FK7103-2AC71-1QA0 is 85015220.
Where does 1FK7103-2AC71-1QA0 ship from, and how fast?
1FK7103-2AC71-1QA0 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
Guides
Guides for servo drives
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Reviews
Customer reviews
Series
Siemens SIMOTICS S
- Brand
- Siemens
- Series
- SIMOTICS S
