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
- 1FK7105-2AC71-1QA0
SIMOTICS SSiemens 1FK7105-2AC71-1QA0 SIMOTICS S 1FK7-CT 48 Nm 2000 rpm Servo Motor
Siemens 1FK7-CT synchronous servo motor, 48 Nm, 7.7 kW, 2000 rpm, IP64, Drive-CLiQ absolute encoder, no holding brake.
Description
About the 1FK7105-2AC71-1QA0
About the 1FK7105-2AC71-1QA0
The Siemens 1FK7105-2AC71-1QA0 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, and carries a Drive-CLiQ absolute single-turn 20-bit encoder (AS20DQI) with IP64 protection and no holding brake.
Selection Notes
This frame delivers 48 Nm standstill torque at 7.7 kW, more continuous torque and power than a smaller frame size in the same servo motor series, for axes that need more continuous torque at the same 2000 rpm nominal speed. Without a holding brake, the servo drive or an external brake must hold the axis at standstill; the same frame is also offered with an integrated brake for vertical or overhung-load axes. At 154.000 kgcm2 moment of inertia and a 125,000 Nm/rad shaft torsional stiffness, this motor suits higher-inertia loads than a smaller frame size in the series.
Specification
Full specification
Engineering data 10
| Rated speed (100 K) | 2,000 rpm |
|---|---|
| Number of poles | 8 |
| Rated torque (100 K) | 37.0 Nm |
| Rated current | 16.0 A |
| Static torque (60 K) | 40.00 Nm |
| Static torque (100 K) | 48.00 Nm |
| Stall current (60 K) | 16.20 A |
| Stall current (100 K) | 20.00 A |
| Moment of inertia | 154.000 kgcm² |
| Efficiency | 93.0 % |
Physical constants 9
| Torque constant | 2.37 Nm/A |
|---|---|
| Voltage constant at 20º C | 157.5 V/1000*min¯¹ |
| Winding resistance at 20º C | 0.17 Ω |
| 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 | 125,000 Nm/rad |
| Net weight of the motor | 39.0 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 | 1FK7105-2AC71-1QA0 |
|---|---|
| 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 | 7.7 kW |
Limiting data 4
| Max. permissible speed (mech.) | 5,000 rpm |
|---|---|
| Max. permissible speed (inverter) | 3,650 rpm |
| Maximum torque | 150.0 Nm |
| Maximum current | 71.0 A |
Recommended Motor Module 4
| Rated inverter current | 30 A |
|---|---|
| Maximum inverter current | 72 A |
| Maximum torque | 150.00 Nm |
| Page 1 of 1 | Generated Sun Nov 1 02:26:03 CET 2026 |
Logistics 4
| Shipping weight | 44.001 kg |
|---|---|
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 01 Nov 2026
Documents
Documents for 1FK7105-2AC71-1QA0
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Quick answers
Questions about the 1FK7105-2AC71-1QA0
What is the rated current of 1FK7105-2AC71-1QA0?
The rated current of 1FK7105-2AC71-1QA0 is 16.0 A.
What motor power is 1FK7105-2AC71-1QA0 rated for?
The rated motor power of 1FK7105-2AC71-1QA0 is 7.7 kW.
What is the HS code of 1FK7105-2AC71-1QA0 for customs?
The tariff (HS) code on file for 1FK7105-2AC71-1QA0 is 85015230.
Where does 1FK7105-2AC71-1QA0 ship from, and how fast?
1FK7105-2AC71-1QA0 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
