DC servo motor
maxon EC-i
Slotted iron-core brushless DC motors with internal rotor, built for high torque and dynamics at low voltage in 30-70 mm diameters.
Key specifications
| Outer diameter | 30–70 mm |
|---|---|
| Continuous torque (max) | 2.36 Nm |
| Power (max) | 800 W |
| Voltage | 12-60 V windings |
Summarised in our own words from maxon group (maxon motor ag)'s published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2 · Source 3
Notes on this data
Sizes EC-i 30, 40, 52, 70. EC-i 70 (800 W) nominal torque ~2,250 mNm (48 V) / ~2,360 mNm (60 V), values marked provisional. EC-i 30: 30 W, ~37 mNm, 15,000 rpm. EC-i 70 page shows speeds of ~21,600-22,900 rpm that look like no-load speeds rather than max permissible speed, so speed_rpm_max left out. Classified servo-motors/dc-servo (low-voltage BLDC).
Specify Motion is not affiliated with maxon group (maxon motor ag). maxon and EC-i are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Alternatives that meet or exceed these figures
Engineers often come to us with a maxon 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.
Low-voltage brushless DC servo motors for 48 or 96 VDC systems, with a 12-slot/10-pole design, matched to the Kinco FD1X5 drive and aimed at robotics, CNC and automated lines.
| Published maximum | EC-i | SMK Series Low-Voltage DC Servo Motors |
|---|---|---|
| Power | 800 W | 5,000 W meets or exceeds |
Low-voltage (24-48 VDC) brushless servo motors with a 12-slot/10-pole low-cogging design, IP65 and a choice of optical or magnetic, incremental or absolute encoders. Matched to Kinco FD1 and OD drives for battery-powered and mobile machines.
| Published maximum | EC-i | SMC Series Low-Voltage DC Servo Motors |
|---|---|---|
| Power | 800 W | 3,000 W meets or exceeds |
A single 110 mm, 1.2 kW, 48 VDC servo motor giving 4 Nm at 3000 rpm for higher-power low-voltage systems, paired with Kinco FD1 and OD drives.
| Published maximum | EC-i | SMH Series Low-Voltage DC Servo Motor … |
|---|---|---|
| Rated torque | — | 4 Nm |
| Power | 800 W | 1,200 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 dc servo motor series
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