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.
The Siemens 1FK7060-2AF71-1QB0 is a SIMOTICS S 1FK7-CT synchronous servo motor rated 1.5 kW, 6 Nm standstill torque (M0, 100K), and 3000 rpm rated speed at 600 VDC bus voltage. It is naturally cooled, IMB5-mounted, and fitted with a DRIVE-CLiQ absolute single-turn 20-bit encoder (AS20DQI); this order number adds a holding brake, raising the moment of inertia to 8.700 kgcm².
This 1FK7060-2AF71 winding adds a holding brake, making it the choice for vertical or unbalanced axes that must hold position on power loss; the brake and its hardware raise the moment of inertia to 8.700 kgcm² and total weight to 8.5 kg. The 1.33 Nm/A torque constant and 3.7 A rated current for 6 Nm standstill torque are unchanged from the brake-less build in this winding, since the brake sits at the non-drive end and does not alter the stator's electrical design. Shaft torsional stiffness is 28,500 Nm/rad, lower than the brake-less version in this frame due to the added overhang mass on the shaft.
Natural (fan-less) cooling and IP64 protection suit compact machine enclosures without forced airflow. The DRIVE-CLiQ interface connects directly to SINAMICS S120/S210 drive systems over a single feedback cable. The holding brake makes this winding suited to vertical ball-screw axes, tilting tables, and other unbalanced loads that must not drop when the drive is disabled.
| Rated speed (100 K) | 3,000 rpm |
|---|---|
| Number of poles | 8 |
| Rated torque (100 K) | 4.7 Nm |
| Rated current | 3.7 A |
| Static torque (60 K) | 5.00 Nm |
| Static torque (100 K) | 6.00 Nm |
| Stall current (60 K) | 3.60 A |
| Stall current (100 K) | 4.45 A |
| Moment of inertia | 8.700 kgcm² |
| Efficiency | 90.0 % |
| Torque constant | 1.33 Nm/A |
|---|---|
| Voltage constant at 20º C | 85.5 V/1000*min¯¹ |
| Winding resistance at 20º C | 1.35 Ω |
| Rotating field inductance | 15.2 mH |
| Electrical time constant | 11.30 ms |
| Mechanical time constant | 1.71 ms |
| Thermal time constant | 30 min |
| Shaft torsional stiffness | 28,500 Nm/rad |
| Net weight of the motor | 8.5 kg Permanent-magnet synchronous |
| Motor type | motor Compact |
|---|---|
| Shaft height | 63 |
| Cooling | Natural cooling |
| Radial runout tolerance | 0.040 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 |
| Part number | 1FK7060-2AF71-1QB0 |
|---|---|
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Optimum speed | 3,000 rpm |
|---|---|
| Optimum power | 1.5 kW |
| Max. permissible speed (mech.) | 7,200 rpm |
|---|---|
| Max. permissible speed (inverter) | 6,700 rpm |
| Maximum torque | 18.0 Nm |
| Maximum current | 15.0 A |
| Holding brake version | Permanent-magnet brake |
|---|---|
| Holding torque | 13.0 Nm |
| Power supply voltage | DC 24 V ± 10 % |
| Coil current | 0.8 A |
| Opening time | 100 ms |
| Closing time | 50 ms |
| Highest braking work | 380 J |
| Rated inverter current | 5A |
|---|---|
| Maximum inverter current | 15 A |
| Maximum torque | 18.00 Nm |
| Page 1 of 1 | Generated Sun Nov 1 02:17:16 CET 2026 |
| Shipping weight | 8.4 kg |
|---|---|
| Ships from | Türkiye |
| Dispatch | 16 Nov |
| Stock | Low stock |
Source: manufacturer data · Last verified: 01 Nov 2026
No documents are on file for this part yet.
Ask us for the datasheetThe rated current of 1FK7060-2AF71-1QB0 is 3.7 A.
The rated motor power of 1FK7060-2AF71-1QB0 is 1.5 kW.
The tariff (HS) code on file for 1FK7060-2AF71-1QB0 is 85015220.
1FK7060-2AF71-1QB0 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival. Stock items are dispatched within 1–2 business days.
A side-by-side comparison of VFD and servo drive motor type, feedback, dynamic response, overload rating, cost, and applications for industrial engineers.
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