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
- 1FK7040-2AK71-1QB0
SIMOTICS SSiemens 1FK7040-2AK71-1QB0 SIMOTICS S 1FK7-CT 1.6 Nm 6000 rpm Servo Motor
Siemens 1FK7040-2AK71-1QB0 1FK7-CT servo motor, 1.6 Nm, 0.69 kW at 6000 rpm, holding brake, IP64, DRIVE-CLiQ 20-bit absolute encoder.
Description
About the 1FK7040-2AK71-1QB0
About the 1FK7040-2AK71-1QB0
Siemens 1FK7040-2AK71-1QB0 SIMOTICS S 1FK7-CT servo motor delivers 1.6 Nm standstill torque and 0.69 kW rated power at 6000 rpm on a 600 V DC link. It is an 8-pole design with 1.9 A rated current, IP64 protection, a 20-bit single-turn absolute encoder (AS20DQI) with a DRIVE-CLiQ interface, and an integrated holding brake.
Selection Notes
This is the holding-brake version of the 1FK7040-CT frame: the brake raises rotor inertia to 1.920 kgcm² and lowers shaft torsional stiffness to 13,000 Nm/rad compared with the non-brake motor in the same frame, though stiffness still exceeds the smaller 36 mm-frame motors in this range. Choose it for vertical or gravity-loaded axes at this higher torque-and-speed class that must hold position without drive power; for horizontal axes the non-brake version responds faster due to its lower inertia.
Applications
1.6 Nm at 6000 rpm with a holding brake and the 48 mm frame's higher torsional stiffness suits vertical Z-axis drives and heavier gravity-loaded axes in machine-tool and packaging equipment where the load must not drop on power loss.
Specification
Full specification
Engineering data 10
| Rated speed (100 K) | 6,000 rpm |
|---|---|
| Number of poles | 8 |
| Rated torque (100 K) | 1.1 Nm |
| Rated current | 1.9 A |
| Static torque (60 K) | 1.30 Nm |
| Static torque (100 K) | 1.60 Nm |
| Stall current (60 K) | 1.90 A |
| Stall current (100 K) | 2.35 A |
| Moment of inertia | 1.920 kgcm² |
| Efficiency | 88.0 % |
Physical constants 9
| Torque constant | 0.68 Nm/A |
|---|---|
| Voltage constant at 20º C | 43.4 V/1000*min¯¹ |
| Winding resistance at 20º C | 2.87 Ω |
| Rotating field inductance | 16.5 mH |
| Electrical time constant | 5.70 ms |
| Mechanical time constant | 3.00 ms |
| Thermal time constant | 25 min |
| Shaft torsional stiffness | 13,000 Nm/rad |
| Net weight of the motor | 3.9 kg Permanent-magnet synchronous |
Mechanical data 16
| Motor type | motor Compact |
|---|---|
| Shaft height | 48 |
| Cooling | Natural cooling |
| Radial runout tolerance | 0.040 mm |
| Concentricity tolerance | 0.08 mm |
| Axial runout tolerance | 0.08 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 | 1FK7040-2AK71-1QB0 |
|---|---|
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
Optimum operating point 2
| Optimum speed | 6,000 rpm |
|---|---|
| Optimum power | 0.7 kW |
Limiting data 4
| Max. permissible speed (mech.) | 9,000 rpm |
|---|---|
| Max. permissible speed (inverter) | 9,000 rpm |
| Maximum torque | 5.1 Nm |
| Maximum current | 7.7 A |
Holding brake 7
| Holding brake version | Permanent-magnet brake |
|---|---|
| Holding torque | 4.0 Nm |
| Power supply voltage | DC 24 V ± 10 % |
| Coil current | 0.5 A |
| Opening time | 70 ms |
| Closing time | 30 ms |
| Highest braking work | 150 J |
Recommended Motor Module 4
| Rated inverter current | 3A |
|---|---|
| Maximum inverter current | 9A |
| Maximum torque | 5.10 Nm |
| Page 1 of 1 | Generated Sun Nov 1 02:14:53 CET 2026 |
Logistics 4
| Shipping weight | 4.0 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 1FK7040-2AK71-1QB0
What is the rated current of 1FK7040-2AK71-1QB0?
The rated current of 1FK7040-2AK71-1QB0 is 1.9 A.
What motor power is 1FK7040-2AK71-1QB0 rated for?
The rated motor power of 1FK7040-2AK71-1QB0 is 0.69 kW.
What is the HS code of 1FK7040-2AK71-1QB0 for customs?
The tariff (HS) code on file for 1FK7040-2AK71-1QB0 is 85015100.
Where does 1FK7040-2AK71-1QB0 ship from, and how fast?
1FK7040-2AK71-1QB0 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
- Brand
- Siemens
- Series
- SIMOTICS S
