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
- 1FK7080-2AF71-1QB0
SIMOTICS SSiemens 1FK7080-2AF71-1QB0 SIMOTICS S 1FK7-CT Synchronous Servo Motor 8Nm 3000rpm
SIMOTICS S 1FK7-CT synchronous servo motor, 8 Nm, 3000 rpm, 4.4 A, IP64, brake.
Description
About the 1FK7080-2AF71-1QB0
About the 1FK7080-2AF71-1QB0
The Siemens 1FK7080-2AF71-1QB0 is a SIMOTICS S 1FK7-CT synchronous servo motor rated 8 Nm continuous torque (M0 at 100K) at 3,000 rpm, with 4.4 A rated current and a shaft height of 80 mm. It uses natural cooling, carries IP64 protection, and includes a Drive-CLiQ single-turn absolute encoder (20-bit), with a holding brake.
Selection Notes
Moving to the shaft-height-80 frame lowers continuous torque to 8 Nm versus the 11-12 Nm shaft-63 windings, but the larger frame gives a stiffer 81,000 Nm/rad shaft and a higher 92.0% efficiency, which suits higher-inertia loads that need a stiffer mechanical coupling at the same 3,000 rpm base speed. The integrated holding brake retains axis position once drive power is removed.
Applications
Fits synchronous servo axes needing 8 Nm at 3,000 rpm with higher load inertia than the shaft-63 frame handles well, in machine tool and handling applications where the holding brake secures the axis when de-energized. 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) | 3,000 rpm |
|---|---|
| Number of poles | 8 |
| Rated torque (100 K) | 6.8 Nm |
| Rated current | 4.4 A |
| Static torque (60 K) | 6.60 Nm |
| Static torque (100 K) | 8.00 Nm |
| Stall current (60 K) | 4.00 A |
| Stall current (100 K) | 4.90 A |
| Moment of inertia | 17.500 kgcm² |
| Efficiency | 92.0 % |
Physical constants 9
| Torque constant | 1.61 Nm/A |
|---|---|
| Voltage constant at 20º C | 105.0 V/1000*min¯¹ |
| Winding resistance at 20º C | 0.98 Ω |
| Rotating field inductance | 17.2 mH |
| Electrical time constant | 17.50 ms |
| Mechanical time constant | 1.52 ms |
| Thermal time constant | 40 min |
| Shaft torsional stiffness | 81,000 Nm/rad |
| Net weight of the motor | 13.3 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 | with holding brake |
| Shaft end | Feather key |
| Encoder system | Encoder AS20DQI: absolute encoder single-turn 20 bits |
Show all 61 specifications ↓ Show less ↑26 more values in Identification, Optimum operating point, Limiting data, Holding brake, Recommended Motor Module, Logistics.
Identification 5
| Part number | 1FK7080-2AF71-1QB0 |
|---|---|
| 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 | 2.1 kW |
Limiting data 4
| Max. permissible speed (mech.) | 6,000 rpm |
|---|---|
| Max. permissible speed (inverter) | 5,500 rpm |
| Maximum torque | 25.0 Nm |
| Maximum current | 18.0 A |
Holding brake 7
| Holding brake version | Permanent-magnet brake |
|---|---|
| Holding torque | 22.0 Nm |
| Power supply voltage | DC 24 V ± 10 % |
| Coil current | 0.9 A |
| Opening time | 200 ms |
| Closing time | 60 ms |
| Highest braking work | 1,400 J |
Recommended Motor Module 4
| Rated inverter current | 5A |
|---|---|
| Maximum inverter current | 15 A |
| Maximum torque | 22.10 Nm |
| Page 1 of 1 | Generated Sun Nov 1 02:20:22 CET 2026 |
Logistics 4
| Shipping weight | 11.6 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 1FK7080-2AF71-1QB0
What is the rated current of 1FK7080-2AF71-1QB0?
The rated current of 1FK7080-2AF71-1QB0 is 4.4 A.
What motor power is 1FK7080-2AF71-1QB0 rated for?
The rated motor power of 1FK7080-2AF71-1QB0 is 2.1 kW.
What is the HS code of 1FK7080-2AF71-1QB0 for customs?
The tariff (HS) code on file for 1FK7080-2AF71-1QB0 is 85015220.
Where does 1FK7080-2AF71-1QB0 ship from, and how fast?
1FK7080-2AF71-1QB0 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
Guides
Guides for servo drives
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Series
Siemens SIMOTICS S
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- Siemens
- Series
- SIMOTICS S
