AC servo motor
Siemens SIMOTICS S-1FL6
Cost-focused servo motor paired with the SINAMICS V90 drive, offered in low- and high-inertia versions with threefold overload and surface cooling.
Key specifications
| Ingress protection | IP65 |
|---|---|
| Rated torque | 0.16–33.4 Nm |
| Rated speed | 2000-5000 (LI up to 5000, HI up to 3000) |
| Power | 50–7,000 W |
| Frame sizes | 20, 90 mm |
| Supply | via SINAMICS V90: 200 V class (LI 0.05-2.0 kW) and 400 V class (HI 0.4-7.0 kW) |
| Feedback | single-turn absolute, multi-turn absolute, incremental |
| Overload | 300% |
Summarised in our own words from Siemens AG's published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2
Notes on this data
LI 0.16-6.37 Nm / 0.05-2.0 kW; HI 1.27-33.4 Nm / 0.4-7.0 kW (standstill torque, 2022 brochure). LI=200V class and HI=400V class mapping is inferred from V90 power bands, not stated explicitly. No discontinuation notice found on V90 page; S200/1FL2 is listed as a related newer system but not called a successor.
Specify Motion is not affiliated with Siemens AG. Siemens and SIMOTICS S-1FL6 are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Alternatives that meet or exceed these figures
Engineers often come to us with a Siemens part number and leave with an alternative that is easier to source, quicker to deliver or a better fit for the machine. These 3 series from our supply network are the closest match on published figures.
Kinco's current-generation AC servo motor line, matched to the JD2 and FD5P PRO drives. Small-inertia 40-80 mm frames run at 3000 rpm on 220 V; large-inertia 130 and 180 mm frames are 1500 rpm machines reaching 47.8 Nm rated and 7.5 kW, with 23-bit multi-turn absolute encoders as standard.
| Published maximum | SIMOTICS S-1FL6 | SMK Series AC Servo Motors (SMK40S/60S… |
|---|---|---|
| Rated torque | 33.4 Nm | 47.8 Nm meets or exceeds |
| Peak torque | — | 119.5 Nm |
| Speed | — | 6,000 rpm |
| Power | 7,000 W | 7,500 W meets or exceeds |
Kinco's established AC servo motor range from 40 to 180 mm frames, covering 50 W to 7.5 kW and up to 48 Nm rated torque. Standard feedback is a 2500-line incremental encoder with Hall commutation, with absolute options and a resolver on the 180 mm frame. Pairs with FD2S and CD2S drives.
| Published maximum | SIMOTICS S-1FL6 | SMH Series AC Servo Motors (SMH40S-SMH… |
|---|---|---|
| Rated torque | 33.4 Nm | 48 Nm meets or exceeds |
| Power | 7,000 W | 7,500 W meets or exceeds |
Leadshine's AC servo motors for the EL8/EL7/EL6 drives: ELM1 is the economy line and ELM2 the general-purpose line, both with 23-bit absolute encoders, IP65/IP67 sealing and up to 3.5x overload. The catalogue extends ELM2M to 22 kW and previews a 26-bit ELM3.
| Published maximum | SIMOTICS S-1FL6 | ELM1 / ELM2 AC Servo Motors |
|---|---|---|
| Rated torque | 33.4 Nm | — |
| Power | 7,000 W | 7,500 W meets or exceeds |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
Other ac servo motor series
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