AC servo motor
Siemens SIMOTICS S-1FL2
Newer general-purpose servo motor for the SINAMICS S200 system, available in low, medium and high inertia with battery-free multi-turn encoders and up to 350% overload.
Key specifications
| Ingress protection | IP65 (SH20/30/40 IP54 standard, IP65 option) |
|---|---|
| Rated torque | 0.16–33.4 Nm |
| Speed (max) | 6,500 rpm |
| Rated speed | 3000 (2000 on some 400 V variants) |
| Power | 50–7,000 W |
| Frame sizes | 20, 30, 40, 45, 48, 52, 65, 90 mm |
| Supply | 200 V (LI 0.05-1.0 kW, MI 0.2-1.0 kW) and 400 V (LI 0.05-2.0 kW, MI 0.2-1.5 kW, HI 0.4-7.0 kW) |
| Feedback | single-turn absolute 17-bit, single-turn absolute 21-bit, multi-turn absolute 21-bit + 12-bit (battery-less) |
| Overload | up to 350% |
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
Max speed 6500 rpm applies to LI/MI; HI about 4000 rpm. Variants: 1FL21 low inertia, 1FL22 medium inertia, 1FL23 high inertia. Overview PDF is (c) 2023.
Specify Motion is not affiliated with Siemens AG. Siemens and SIMOTICS S-1FL2 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 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-1FL2 | SMH Series AC Servo Motors (SMH40S-SMH… |
|---|---|---|
| Rated torque | 33.4 Nm | 48 Nm meets or exceeds |
| Speed | 6,500 rpm | — |
| Power | 7,000 W | 7,500 W meets or exceeds |
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-1FL2 | SMK Series AC Servo Motors (SMK40S/60S… |
|---|---|---|
| Rated torque | 33.4 Nm | 47.8 Nm meets or exceeds |
| Peak torque | — | 119.5 Nm |
| Speed | 6,500 rpm | 6,000 rpm |
| 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-1FL2 | ELM1 / ELM2 AC Servo Motors |
|---|---|---|
| Rated torque | 33.4 Nm | — |
| Speed | 6,500 rpm | — |
| 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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