Unitree YS-342026-S288 Brushless Digital Servo

Unitree Brushless Digital Servo S288 (model YS-342026-S288) is a compact, ultra-lightweight brushless digital servo actuator designed specifically for embodied intelligence applications. It integrates a high-speed brushless motor, a precision gearbox, and a control board with built-in sensors into a single modular package, primarily utilized in robotic joints, arms, and dexterous hands.

Unitree YS-342026-S288 Brushless Digital Servo Key Specifications：

Mechanical & Physical Specs
--------------------------------------------
- Dimensions (W x H x D): 20 x 34 x 26 mm
- Weight: 19.5 g
- Housing & Gear Material: High-strength engineering plastic
- Gear Ratio: 288.35:1 (Spur gear)

Performance & Electrical Specs
--------------------------------------------
- Input Voltage: 6.4V - 12.6V (Recommended: 12.6V)
- Maximum Speed: 16.5 rad/s (157 rpm) @ 12V
- Maximum (Stall) Torque:
* 0.07 Nm (when torque is in the same direction as speed)
* 0.2 Nm (when torque is in the opposite direction of speed)
- Torque Constant: 0.554 Nm/A
- No-load Current: 0.27A @ 12V
- Standby Current: 0.05A @ 12V
- Maximum Line Current: 0.32A

Communication & Control
--------------------------------------------
- Control System: Integrated hybrid control
- Operating Modes: Hybrid mode supporting Torque, Angle (8192 steps), Velocity, Stiffness, and Damping control
- Communication Protocol: Unitree Custom Protocol via half-duplex asynchronous serial communication (8-bit, 1 stop, No Parity)
- Physical Interface: TTL level multi-point bus
- Baud Rate: 6,000,000 bps
- Supported Address Range: IDs 0-14
- Sensors & Feedback: Dual 15-bit absolute encoders tracking the rotor end and output end; built-in temperature and voltage monitoring

Safety Features
--------------------------------------------
- Overheating Protection: Automated driver board shutdown if temperature exceeds 90 degree C; motor winding shutdown if temperature exceeds 120 degree C.

Note: Unitree also offers a J288 model, which shares identical dimensions and communication features but swaps the plastic internals for steel gears and an aluminum housing to handle higher voltages and up to 1.5 Nm of torque.