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
- 1FK7080-2AH71-1QA0
SIMOTICS SSiemens 1FK7080-2AH71-1QA0 SIMOTICS S 1FK7-CT Synchronous Servo Motor 8Nm 4500rpm
SIMOTICS S 1FK7-CT synchronous servo motor, 8 Nm, 4500 rpm, 2.1 kW, IP64, no brake.
Description
About the 1FK7080-2AH71-1QA0
About the 1FK7080-2AH71-1QA0
The Siemens 1FK7080-2AH71-1QA0 is a SIMOTICS S 1FK7-CT synchronous servo motor rated 8 Nm continuous torque (M0 at 100K) at 4,500 rpm and 2.1 kW rated power, with a 600 V DC link voltage. It uses natural cooling, carries IP64 protection, and includes a Drive-CLiQ single-turn absolute encoder (20-bit), no holding brake.
Selection Notes
This is the brake-less version of the shaft-height-80, 8 Nm, 4,500 rpm 1FK7-CT winding, lighter than the version fitted with a holding brake. Use it where an external or gearbox-integrated brake already holds the load, since drive power removal leaves this shaft free to rotate.
Applications
Fits synchronous servo axes needing 8 Nm at a 4,500 rpm base speed on the shaft-height-80 frame. The Drive-CLiQ encoder interface connects directly to Drive-CLiQ-enabled Siemens drive systems without separate encoder cabling.
Specification
Full specification
Engineering data 10
| Rated speed (100 K) | 4,500 rpm |
|---|---|
| Number of poles | 8 |
| Rated torque (100 K) | 4.5 Nm |
| Rated current | 4.8 A |
| Static torque (60 K) | 6.60 Nm |
| Static torque (100 K) | 8.00 Nm |
| Stall current (60 K) | 6.00 A |
| Stall current (100 K) | 7.40 A |
| Moment of inertia | 14.200 kgcm² |
| Efficiency | 92.0 % |
Physical constants 9
| Torque constant | 1.08 Nm/A |
|---|---|
| Voltage constant at 20º C | 68.5 V/1000*min¯¹ |
| Winding resistance at 20º C | 0.42 Ω |
| Rotating field inductance | 7.3 mH |
| Electrical time constant | 17.30 ms |
| Mechanical time constant | 1.54 ms |
| Thermal time constant | 40 min |
| Shaft torsional stiffness | 120,000 Nm/rad |
| Net weight of the motor | 10.3 kg Permanent-magnet synchronous |
Mechanical data 16
| Motor type | motor Compact |
|---|---|
| Shaft height | 80 |
| 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 | 1FK7080-2AH71-1QA0 |
|---|---|
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
Optimum operating point 2
| Optimum speed | 4,000 rpm |
|---|---|
| Optimum power | 2.4 kW |
Limiting data 4
| Max. permissible speed (mech.) | 6,000 rpm |
|---|---|
| Max. permissible speed (inverter) | 6,000 rpm |
| Maximum torque | 25.0 Nm |
| Maximum current | 27.5 A |
Recommended Motor Module 4
| Rated inverter current | 9A |
|---|---|
| Maximum inverter current | 27 A |
| Maximum torque | 24.70 Nm |
| Page 1 of 1 | Generated Sun Nov 1 02:20:24 CET 2026 |
Logistics 4
| Shipping weight | 11.301 kg |
|---|---|
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 01 Nov 2026
Documents
Documents for 1FK7080-2AH71-1QA0
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Quick answers
Questions about the 1FK7080-2AH71-1QA0
What motor power is 1FK7080-2AH71-1QA0 rated for?
The rated motor power of 1FK7080-2AH71-1QA0 is 2.1 kW.
What is the HS code of 1FK7080-2AH71-1QA0 for customs?
The tariff (HS) code on file for 1FK7080-2AH71-1QA0 is 85015220.
Where does 1FK7080-2AH71-1QA0 ship from, and how fast?
1FK7080-2AH71-1QA0 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
Guides
Guides for servo drives
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Reviews
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Series
Siemens SIMOTICS S
- Brand
- Siemens
- Series
- SIMOTICS S
