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
- 1FK7100-2AF71-1QB0
Critical stock
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· From Türkiye
0
SIMOTICS SSiemens 1FK7100-2AF71-1QB0 SIMOTICS S 1FK7-CT 18Nm 3.8kW Servo Motor
SIMOTICS S 1FK7-CT synchronous servo motor, 18Nm, 8.0A, IP64, brake.
Description
About the 1FK7100-2AF71-1QB0
About the 1FK7100-2AF71-1QB0
The Siemens 1FK7100-2AF71-1QB0 is a SIMOTICS S 1FK7-CT synchronous servo motor rated 18 Nm standstill torque (M0) at 8.0 A rated current, with a naturally cooled IMB5 design, an absolute single-turn 20-bit Drive-CLiQ encoder, an integrated holding brake, and IP64 protection. Optimum speed is 3,000 rpm with a shaft height of 100 mm and a torque constant of 1.62 Nm/A.
Selection Notes
The 1QB0 configuration adds an integrated holding brake and a feather-key shaft (tolerance N) to the base 1FK7100-2AF71 motor, so it holds position on a vertical or overhung load when drive power is removed, pick it over a brakeless variant whenever the axis must not drift at standstill. At 18 Nm standstill torque and 8.0 A rated current with a 22.50 ms electrical time constant, it suits mid-range single-axis positioning rather than the smaller or larger frame sizes in the 1FK7 line. The 20-bit single-turn Drive-CLiQ encoder gives absolute position feedback without a battery-backed multi-turn option, so an external reference or homing move is still needed after more than one revolution of travel.
Applications
Suited to single-axis servo positioning where a vertical or gravity-loaded axis needs to hold position without drive power, such as lift and gantry axes, rotary indexers, and machine tool feed axes controlled over Drive-CLiQ from a SINAMICS drive.
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 | 62.000 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 | 135,000 Nm/rad |
| Net weight of the motor | 21.0 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 | 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 | 1FK7100-2AF71-1QB0 |
|---|---|
| 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 | 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 |
Holding brake 7
| Holding brake version | Permanent-magnet brake |
|---|---|
| Holding torque | 23.0 Nm |
| Power supply voltage | DC 24 V ± 10 % |
| Coil current | 1.0 A |
| Opening time | 300 ms |
| Closing time | 70 ms |
| Highest braking work | 3,380 J |
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 02:24:28 CET 2026 |
Logistics 4
| Shipping weight | 19.9 kg |
|---|---|
| Ships from | Türkiye |
| Dispatch | 16 Nov |
| Stock | Critical stock |
Source: manufacturer data · Last verified: 01 Nov 2026
Documents
Documents for 1FK7100-2AF71-1QB0
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Quick answers
Questions about the 1FK7100-2AF71-1QB0
What is the rated current of 1FK7100-2AF71-1QB0?
The rated current of 1FK7100-2AF71-1QB0 is 8.0 A.
What motor power is 1FK7100-2AF71-1QB0 rated for?
The rated motor power of 1FK7100-2AF71-1QB0 is 3.8 kW.
What is the HS code of 1FK7100-2AF71-1QB0 for customs?
The tariff (HS) code on file for 1FK7100-2AF71-1QB0 is 85015220.
Where does 1FK7100-2AF71-1QB0 ship from, and how fast?
1FK7100-2AF71-1QB0 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival. Stock items are dispatched within 1–2 business days.
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Series
Siemens SIMOTICS S
- Brand
- Siemens
- Series
- SIMOTICS S
