Brushless motor
Long service life, low inertia, high speed, and force control.
UNITREE · Robotic components
Unitree S288 / J288 Digital Servo
Brushless digital servo
Compact design for embedded intelligence applications. The manufacturer presents the product image on the right, with the title and a short introduction on the left; a wide background video has not been verified.
Compact design for embedded intelligence applications
The brushless motor is presented as offering a long service life, low inertia, high speed, and force control. Other highlights: temperature and position sensors, a backdrivable precision gearbox, high integration, high power and speed, and high-speed communication.
Temperature and position sensors
Temperature and position sensing.
Precision gearbox
Backdrivable precision reducer.
High integration
Integrated compact servo approach.
High power and speed
Performance depends on the model and supply voltage.
High-speed communication
The manufacturer reports a baud rate of 6.000.000 bps.
J288 and S288 performance comparison
The manufacturer’s comparison covers maximum stall torque, torque direction, baud rate, maximum no-load speed, and no-load current. It specifically notes that the stall torque is in the opposite direction to the rotation speed.
| J288 | Maximum stall torque 1,5 Nm; 6.000.000 bps |
|---|---|
| S288 | Maximum stall torque 0,6 Nm; 6.000.000 bps |
Control modes
Angle control enables continuous rotation without an angle limit at a resolution of 8192 steps. Feedback: rotor torque and angle, output angle, rotor angular velocity, temperature, voltage, and error status. Hybrid mode covers rotor torque, angle, angular velocity, stiffness, and damping.
Continuous rotation without an angle limit.
8192-step resolution
Angle control
Continuous rotation without an angle limit.
Rotor torque/angle, output angle, rotor angular velocity, temperature, voltage, and error status.
Rotor torque, rotor angle and speed; rotor stiffness and damping parameters.
Hybrid control
Hybrid operation
Rotor torque, rotor angle and speed; rotor stiffness and damping parameters.
Applications
Unitree S288 / J288 Digital Servo Unitree S288 / J288 is a digital servo series designed for DIY projects, robot competitions, scientific research and educational applications. It provides precise control of moving joints and is suitable for use in such applications. The product is intended primarily for robotics projects requiring motion and position control, prototype development and educational applications.
DIY manufacturing
Do-it-yourself projects and prototyping.
Robot competitions
Motion component in robot competitions.
Scientific research and education
Robotic systems for research and educational purposes.
Moving joints
Motion applications in robot joints.
Assembly diagrams
Front and rear mounting drawings are shown for the YS-342026-S288 and YS-342026-J288 models, respectively.
YS-342026-S288 / YS-342026-J288
Front mounting
Front mounting drawing.
YS-342026-S288 / YS-342026-J288
Rear mounting
Rear mounting drawing.
Technical specifications
Model-specific electrical, mechanical and communication values from the manufacturer's table. S288 and J288 variant values are listed separately.
| Models | YS-342026-S288; YS-342026-J288Manufacturer's model designations. |
|---|---|
| Input voltage | S288: min. 6,4 V; recommended 12,6 V; max. 12,6 V. J288: min. 6,4 V; recommended 25,2 V; max. 25,2 V.Model columns are kept separate. |
| Maximum stall torque | S288 0,6 Nm; J288 1,5 Nm; torque is in the opposite direction to the rotation speed.The manufacturer specifically notes the direction. |
| No-load speed | S288 16,5 rad/s (157 rpm) @12 V. J288 35 rad/s (334 rpm) @25,2 V; 16,5 rad/s (157 rpm) @12 V. |
| No-load current | S288 0,27 A @12 V. J288 0,45 A @25,2 V; 0,27 A @12 V. |
| Maximum line current | S288 0,84 A; J288 1,92 A. |
| Torque constant | Both models 0,554 Nm/A. |
| Operating temperature | Minimum −20 °C. The driver board shuts down above 90 °C and reports an overheating error; the winding shuts down above 120 °C and reports an error.The upper thresholds are shutdown/error thresholds. |
| Position sensor | Dual absolute-value encoders at the rotor and output end. |
| Motor/control | Brushless motor; hybrid control algorithm. |
| Gearing and housing | S288: spur gearing, engineering-plastic gears and housing. J288: spur gearing, steel gears and an aluminum-alloy housing.Materials are specified separately for each model. |
| Dimensions | Both models 20 × 34 × 26 mm (W × H × D). |
| Weight | S288 19,5 g; J288 39 g. |
| Gear ratio | Both models 288,35:1. |
| Encoder resolution | Rotor end: 15 bit; angle control: 8192 steps.The manufacturer gives two values in different technical contexts. |
| Communication | 6.000.000 bps; half-duplex asynchronous serial (8 bit, 1 stop bit, no parity); TTL multidrop bus. |
| ID range | 0–14. |
| Feedback | Rotor torque, rotor angle, output-end angle, rotor angular velocity, temperature, voltage, error status. |
| Hybrid mode parameters | Rotor torque, rotor angle, rotor angular velocity, rotor stiffness and rotor damping. |
| Standby current | S288: 0,05 A @12 V. The J288 table lists values of 0,026 A @25,2 V and 0,05 A @12 V.The J288 rows span multiple lines; confirm separately against the manufacturer's documentation during design. |
Keep the J288 and S288 values separate in the model columns. The manufacturer’s temperature thresholds are given as overheating shutdown and fault-reporting thresholds, not as the upper limit for normal continuous operation.
Safety note
The manufacturer states that the product is a civilian robot; it advises against hazardous modifications and hazardous use, and requires compliance with local laws and regulations.
Next steps for the Unitree S288 / J288 Digital Servo.
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