Product overview
Zhuhai SV Tech Co., Ltd.’s AXR 9845 MG-D is a standard servo for model steering, control surfaces and mechanical actuation. Its configuration combines a brushless motor, stainless steel gears and two bearings in a 40 × 20 × 36.8 mm body weighing 76 g. A 300 mm cable supports connection within the installation. Integration requires matching the supply, mounting holes and servo-arm connection, with the final mounting drawing and interface version governing fabrication because dimensional references can differ.
The servo accepts 4.8–8.4 V and uses PWM control at 333 Hz. At 8.4 V, it delivers a specified 50 kg·cm stall torque and 0.074 s/60° no-load speed; rated torque is 19 kg·cm at 7.4 V. Stall torque is unsuitable as a continuous-load rating, so duty cycle matters. The 1520 µs reference pulse differs from the listed 1500 µs positional midpoint, requiring controller-specific neutral and travel checks. Power integration must accommodate transient current, and the mechanism must avoid sustained loading against its stops.
Specifications
| Specification | Value & conditions |
|---|---|
| Product identity and purpose | AXR 9845 MG-D standard servo for model steering, control surfaces and mechanical actuation. |
| Operating voltage | 4.8–8.4 V |
| Performance at 4.8 V |
|
| Performance at 6 V |
|
| Performance at 7.4 V |
|
| Performance at 8.4 V |
|
| Rated torque | 19 kg·cm @ 7.4 VSupply voltage: 7.4 V. |
| External dimensions | 40 × 20 × 36.8 mm |
| Weight | 76 g |
| Motor | Brushless 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 width and corresponding angle | 500 / 1500 / 2500 µs → -90 / 0 / 90° |
| Continuous-load limitation | Stall torque cannot be used as a continuous-load rating; continuous-duty selection must also account for rated torque and duty cycle. |
| Voltage qualification | The operating-voltage range defines the permitted supply range. |
| Neutral position and usable travel | A 1520 µs reference pulse and a 1500 µs positional midpoint are both specified; neutral position and usable travel require checking with the controller and delivered version.Controller and delivered servo version. |
| Mounting dimensions qualification | Drawings and specifications may use different dimensional references; mounting-part fabrication requires the final mounting drawing and interface version.Final mounting drawing and interface version. |
| Installation and commissioning | Check power supply, signal pulse widths, mounting holes and servo-arm connection. Establish neutral position, direction and mechanical travel with the load removed or limited before progressively applying the working load.Initial setup with the load removed or limited. |
| Power and mechanical integration constraints | Allow supply headroom for transient current; avoid cable voltage drop, reversed polarity and sustained operation against mechanical stops. |
