Product overview
Zhuhai SV Tech Co., Ltd.’s AXR 9840 MG-D is a standard servo for model steering, control-surface movement and mechanical actuation. Its configuration combines a coreless motor, stainless steel gears and two bearings in a 40 × 20 × 35.7 mm package weighing 70 g. A 300 mm cable supports installation routing. Integration requires matching the mounting holes and servo-arm connection, with the final mounting drawing and interface version established before mounting parts are fabricated because dimensional reference points can differ.
The servo accepts 4.8–8.4 V and uses PWM control at 333 Hz. At 8.4 V, it delivers 35 kg·cm stall torque and 0.11 s/60° no-load speed, with 0.6 A running current and 9.1 A stall current. Continuous-load selection must instead consider its 16 kg·cm rated torque at 7.4 V and the duty cycle. The 1520 µs reference pulse differs from the 1500 µs position midpoint, so center and usable travel depend on the controller and delivered version. Initial commissioning requires a removed or limited load.
Specifications
| Specification | Value & conditions |
|---|---|
| Product identity and purpose | AXR 9840 MG-D standard servo for model steering, control surfaces and mechanical actuation. |
| Operating voltage | 4.8–8.4 V |
| Performance at 5 V |
|
| Performance at 6 V |
|
| Performance at 7.4 V |
|
| Performance at 8.4 V |
|
| Rated torque | 16 kg·cm @ 7.4 VSupply voltage: 7.4 V. |
| Overall dimensions | 40 × 20 × 35.7 mm |
| Weight | 70 g |
| Motor type | Coreless motor |
| Gear material | Stainless steel gears |
| Bearing count | 2 |
| Cable length | 300 mm |
| Control signal | PWM |
| Operating frequency | 333 Hz |
| Reference pulse width | 1520 µs |
| Pulse widths and corresponding angles | 500 / 1500 / 2500 µs → -90 / 0 / 90° |
| Center-position qualification | The 1520 µs reference pulse and 1500 µs position midpoint are both specified; establish the applicable center and usable travel for the controller and delivered version.Controller and delivered servo version determine the applicable center and usable travel. |
| Continuous-load limitation | Stall torque is not a continuous-load rating; continuous-duty selection must account for rated torque and duty cycle. |
| Voltage-range qualification | The operating voltage range defines the permitted supply range. |
| Mounting integration | Drawing and specification dimensions may use different reference points; establish the final mounting drawing and interface version before fabricating mounting parts. |
| Commissioning and electrical integration | Check supply, signal pulse widths, mounting holes and servo-arm connection. Establish center, direction and mechanical travel before progressively applying working load. Allow supply headroom for transient current and avoid cable voltage drop, reverse polarity and sustained loading against mechanical stops.Initial commissioning with the load removed or limited. |
