Home > 40mm Servo Motor
| Item | Specifications |
|---|---|
| Flange Size | 40 mm |
| Motor Type | Permanent Magnet AC Servo |
| Rated Power | 100 W (0.1 kW) |
| Feedback | 2500-line Incremental Encoder |
| Supply Voltage | 220V AC |
| Rated Speed | 3000 rpm |
| Insulation Class | Class F |
| Protection | IP65 |
| Ambient Temperature | -20℃ ~ +50℃ |
| Brake | Optional (power-off) |
| Cooling | Natural |
| Model | Rated Power (kW) | Rated Torque (N·m) | Peak Torque (N·m) | Rated Speed (rpm) | Rated Current (A) | Standard length (mm) | Length with brake (mm) | Insulation/Protection | Voltage |
|---|---|---|---|---|---|---|---|---|---|
| 40BSF-M01030 | 0.1 | 0.32 | 0.96 | 3000 | 1 | 76.8 | 118.8 | Class F / IP65 | 220V |
*The 40mm frame is a single-power servo. We can manufacture products according to customer’s requirements.
A 40mm servo motor is a compact permanent-magnet AC servo with a 40 mm mounting flange — the smallest frame in our servo range. It runs closed-loop: an encoder feeds rotor position back to the drive every cycle, so the motor holds an exact position even at low speed. It runs at 3000 rpm on a 220V supply and is built for lightweight, space-tight automation where a stepper cannot give the closed-loop accuracy or response the axis needs.
The 40mm servo is a single-power frame rated at 100 W, turning at 3000 rpm on a 220V AC supply. Rated and peak torque, current and body length are listed in the specification table above. Peak torque runs to three times rated for short acceleration bursts. If you are unsure whether the 40mm covers your load, send the numbers and we will size it.
A 40mm servo and a NEMA 17 stepper take up nearly the same space, so the choice is about feedback. The servo runs closed-loop and corrects position every cycle, holds torque to high speed, and runs smoothly under a changing load. A stepper is open-loop, cheaper and fine for steady low-speed moves, but it can lose steps when the load climbs. For fast or precise axes choose the servo; for simple, cost-driven motion a stepper or a closed-loop stepper works.
Yes. Each 40mm servo ships with a matched servo drive, sized and tuned to the motor as a tested set, so commutation, gain and inertia matching are set before delivery. The drive runs position, speed and torque modes, with pulse and direction or bus communication depending on the model. You can also pair the motor with your own drive — ask us for the data you need.
Yes to both. A power-off holding brake is available for vertical or inclined axes, and it adds to the body length — see the table for the braked dimension. A planetary gearbox is also available to trade speed for torque on slower, higher-load axes. Specify the gear ratio when you ask for a quote.
Yes. The 40 frame also comes as a low-voltage DC servo that runs on a 24V or 48V supply instead of 220V mains, built for battery-powered and mobile equipment such as AGVs and AMRs. It keeps the same frame and torque on a low-voltage drive. Ask for the low voltage version if your axis runs on a battery bus.
The 40mm servo uses a 2500-line incremental encoder for closed-loop position feedback, feeding rotor position to the drive every cycle for precise current correction. If your axis needs to retain absolute position across power cycles without homing, contact us to discuss the feedback options for this frame.
Yes. The 40mm servo is built for OEM integration, so the shaft diameter, length and keyway can be made to your drawing. We can also add a brake, fit a gearbox, change the connector and cable, and add an oil seal or higher protection on request. Send your drawing or application and we will confirm what we can match.
The 40mm servo motor is the smallest frame in our servo range — a permanent-magnet AC servo rated at 100 W and 0.32 N·m, running at 3000 rpm on a 220V supply. It runs closed-loop: an encoder reports rotor position to the drive every cycle, so the motor moves to an exact position and holds it under load. The 40mm fits lightweight, space-tight axes that still need real positioning accuracy — small robotic joints, dispensing heads, compact pick-and-place. Where a stepper loses steps when the load climbs, the 40mm servo corrects every cycle and keeps moving.
The 40mm is the entry point of the servo line, built for axes that need closed-loop control in the smallest footprint:
A 40 mm servo and a NEMA 17 stepper share almost the same footprint, so they often come down to the same shortlist. The split is feedback and behaviour under load:
| Feature | 40mm Servo | NEMA 17 Stepper |
|---|---|---|
| Feedback | Closed-loop encoder | Open-loop, no feedback |
| Lost steps | Corrects position every cycle | Can lose steps or stall under load |
| Torque at speed | Holds torque to high rpm | Torque falls as speed rises |
| Dynamic response | Fast, smooth, tunable | Adequate, can resonate |
| Holding current | Draws current to the load | Draws full current to hold |
| Relative cost | Higher | Lower |
| Best for | Fast, varying-load, precise axes | Steady low-speed, cost-driven axes |
Pick the 40mm servo when the axis moves fast, sees a changing load, or has to hit a position every time. Pick a stepper for steady, low-speed, cost-driven motion. A closed-loop stepper motor sits between the two — stepper torque with encoder feedback to stop lost steps.
The 40mm servo suits lightweight, precise axes across compact automation:
The 40 frame also comes as a low-voltage DC servo that runs on a 24V or 48V supply instead of 220V mains — the build for battery-powered and mobile equipment. If your axis sits on an AGV, an AMR or any battery system, use the low voltage servo motor version, which carries the same frame and torque on a low-voltage drive.
The 40mm AC servo is built for OEM integration. Common changes:
Each 40mm servo ships with a matched servo drive, sized and tuned to the motor as a tested set, so commutation, gain and inertia matching are set before delivery. The drive runs position, speed and torque modes, with pulse and direction or bus communication depending on the model. As a servo motor manufacturer, we test the motor and drive together and ship the encoder built in.
