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Unitree Brushless Digital Servo - Compact Modular Driver
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Unitree Brushless Digital Servo is the YS-342026 series digital servo, a modular driver consisting of a gear reducer, a brushless high-speed motor, and a control board package. The motor and reducer are highly integrated in a compact 20 x 34 x 26 mm size. It includes a built-in temperature sensor and supports multiple operating modes. Designed for embodied intelligence applications, it can be used in robot joints and power components such as robotic arms and dexterous hands.
Highlights
- Brushless digital servo with integrated gear reducer, brushless high-speed motor, and control board package.
- Compact 20 x 34 x 26 mm design.
- Built-in temperature sensor.
- Supports multiple operating modes.
- Uses rotor and output-end dual absolute value encoders.
- Supports high-speed communication at 6,000,000 bps.
- Uses Unitree Custom Protocol over half-duplex asynchronous serial communication.
- Available as S288 with engineering plastic gear and shell, and J288 with steel gear and aluminum alloy shell.
- J288 is described as an upgraded version of S288 for enhanced heat dissipation, servo life, and impact resistance.
Technical specifications
| Spec | Value |
| Models - S288 model | YS-342026-S288 |
| Models - J288 model | YS-342026-J288 |
| Input Voltage - S288 minimum input voltage | 6.4 V |
| Input Voltage - S288 recommended input voltage | 12.6 V |
| Input Voltage - S288 maximum input voltage | 12.6 V |
| Input Voltage - J288 minimum input voltage | 6.4 V |
| Input Voltage - J288 recommended input voltage | 25.2 V |
| Input Voltage - J288 maximum input voltage | 25.2 V |
| Performance - S288 performance voltage | 12.6 V |
| Performance - J288 performance voltage | 25.2 V |
| Performance - S288 no-load current | 0.27 A @ 12 V |
| Performance - J288 no-load current | 0.45 A @ 25.2 V; 0.27 A @ 12 V |
| Performance - S288 maximum line current | 0.32 A |
| Performance - J288 maximum line current | 1.92 A |
| Performance - S288 maximum no-load speed | 16.5 rad/s |
| Performance - J288 maximum no-load speed | 35 rad/s @ 25.2 V; 16.5 rad/s @ 12 V |
| Performance - S288 torque constant | 0.554 Nm/A |
| Performance - J288 torque constant | 0.554 Nm/A |
| Performance - S288 maximum stall torque | Torque in the same direction as speed: 0.07 Nm; torque in the opposite direction of rotational speed: 0.2 Nm |
| Performance - J288 maximum stall torque | Torque in the same direction as speed: 0.5 Nm; torque in the opposite direction of rotational speed: 1.5 Nm |
| Operating Temperature - Minimum operating temperature | -20 ℃ |
| Operating Temperature - Driver board overheat shutdown | Shuts down and reports an overheat error when exceeding 90 degrees |
| Operating Temperature - Winding overheat shutdown | Shuts down and reports an overheat error when exceeding 120 degrees |
| Sensors - Position sensor | Rotor, output end, dual absolute value encoder |
| Motor - Motor type | Brushless Motor |
| Communication - Baud rate | 6,000,000 bps |
| Control - Control algorithm | Hybrid Control |
| Gear - Gear type | Spur Gear |
| Materials - S288 gear material | Engineering Plastic |
| Materials - J288 gear material | Steel |
| Materials - S288 shell material | Engineering Plastic |
| Materials - J288 shell material | Aluminum Alloy |
| Dimensions - Dimensions | 20 x 34 x 26 mm |
| Weight - S288 weight | 19.5 g |
| Weight - J288 weight | 35 g |
| Gear - Gear ratio | 288.35:1 |
| Command and Protocol - Command signal | Digital data packet |
| Encoder - Rotor end encoder resolution | 15 bit |
| Command and Protocol - Protocol type | Half-duplex asynchronous serial communication (8 bit, 1 stop, No Parity) |
| Connection - Physical connection | TTL level multi-point bus |
| Communication - ID | 0-14 |
| Feedback - Motor sensing feedback | Rotor torque, rotor angle, output end angle, rotor angular velocity, temperature, voltage, error status |
| Command and Protocol - Protocol version | Unitree Custom Protocol |
| Operating Mode - Hybrid mode parameters | Rotor torque, rotor angle, rotor angular velocity, rotor stiffness, rotor damping |
| Power - S288 standby current | 0.05 A @ 12 V |
| Power - J288 standby current | 0.026 A @ 25.2 V; 0.05 A @ 12 V |
Use cases
- Robot joints
- Power components
- Robotic arms
- Dexterous hands
- Robot competitions
- DIY creation
- Scientific research and education