The ENGINEAI SA01 Bipedal Robot Platform represents a new generation of open-source biped robotics. Developed for research institutions, robotics developers, and advanced engineering teams, the SA01 integrates a fully open mechanical architecture, transparent motion-control algorithms, high-performance self-developed joints, and a robust aerospace-grade structural design. Its straight-knee gait, high freedom-of-motion legs, and modular expansion capability make it one of the most versatile biped systems available for next-generation humanoid research.

1. Core Advantages at a Glance

SA01 Key Advantage Overview

Core Advantage	Description
Full Open-Source Design	Entire mechanical structure, interfaces, and software stack are openly accessible for secondary development.
12-DOF High Mobility	Six degrees of freedom per leg enable highly dynamic, stable, and human-like motion abilities.
Straight-Knee Gait Technology	Proprietary locomotion mechanics eliminate the traditional crouched gait seen in many humanoid robots.
High-Performance Joint Modules	Hip and knee joints deliver peak torque of 160 Nm, powered by fully self-developed actuators.
Aerospace-Grade Aluminum Exoskeleton	High-strength, lightweight structural frame protects internal electronics and enhances durability.
High-Capacity Quick-Swap Battery	15Ah 54.6V power system with rapid replacement for long experiment cycles.

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2. Open-Source Architecture

2.1 Open Mechanical Platform

Feature	Details
Mechanical Openness	Full hardware structure and interface documentation available
Supported Customization	Mechanical arms, additional sensors, custom modules
Structural Modification	Users can redesign or expand chassis components
Target Users	Universities, robotics labs, startups, hardware researchers
Benefit	Enables deep research into robot mechanics and rapid prototyping

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2.2 Open Motion-Control Algorithms

Open-Source Layer	Capabilities
Low-Level Motor Control	Full access to torque control, motion loops, joint drivers
Motion Framework	Replaceable control modules (IK, gait planner, balance algorithms)
Real-Time Control Access	Developers can deploy custom algorithms directly on the robot
Research Value	Ideal for reinforcement learning, locomotion experiments, HRI studies

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3. Motion Performance

3.1 Straight-Knee Gait System

Performance Indicator	Description
Gait Type	Proprietary straight-knee locomotion
Degrees of Freedom	6 DOF per leg
Balance Control	Real-time reactive balancing with disturbance rejection
Motion Characteristics	Natural stride formation, stable acceleration/deceleration
Scenario Suitability	Research, mobility algorithms, uneven-surface walking

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3.2 High-Performance Joint System

Joint Feature	Specification
Peak Torque	160 Nm at hip and knee
Encoder System	Dual absolute magnetic encoders
Failure Recovery	Maintains joint position memory after power loss
Internal Protection	Built-in safety and thermal protection
Integration	Full hardware–software fused design

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4. Structural Engineering

4.1 Aerospace-Grade Aluminum Alloy

Structural Component	Material	Benefits
Main Exoskeleton	Aviation-grade aluminum alloy	High stiffness, reduced mass, improved energy efficiency
Protective Shell	Reinforced aluminum housing	Strong impact resistance
Internal Frame	Precision-machined alloy	Better stability during dynamic movements

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5. Power System

5.1 Quick-Swap Lithium Battery

Battery Parameter	Value
Capacity	15Ah
Voltage	54.6V
Energy Content	0.819 kWh
Operation Time	~2 hours
Swap Mechanism	Fast-release, tool-free battery change
Application Value	Enables long-duration experiments and field tests

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6. Technical Specifications

6.1 Physical Dimensions & Weight

Category	Specification
Size (Standing)	1350 mm × 250 mm × 350 mm
Thigh Length	400 mm
Shank Length	400 mm
Total Weight	~40 kg

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6.2 Mobility & Degrees of Freedom

Mobility Parameter	Value
Total DOF	12
DOF per Leg	6
Walking Speed	~1 m/s
Max Joint Torque	160 Nm

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6.3 Electrical Characteristics

Electrical Spec	Value
Power Supply	15Ah, up to 54.6V
Energy Capacity	0.819 kWh
Operating Temperature	-20°C to 55°C
Battery Life	Approx. 2 hours

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6.4 Perception & Load Capacity

Sensor Type	Specification
IMU	High-precision inertial sensing for balance and orientation
Load Capacity	10–15 kg

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7. System Architecture Overview

Full Architecture Summary Table

System Layer	Components	Key Functions
Hardware Layer	Self-developed joints, aluminum chassis, modular interfaces	Structural durability, payload support
Motion-Control Layer	Gait engine, balance control, real-time adjustment	Straight-knee locomotion, stability
Perception Layer	IMU, sensor integration ports	State estimation, orientation
Power Layer	15Ah 54.6V battery system	Continuous operation and fast swap
Expansion Layer	Robotic arm ports, sensor add-ons, custom hardware	Bionic research, AI modules, HRI experiments
Software Layer	Open-source control framework	Algorithm research, custom control strategies

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8. Application Domains

SA01 Usage Scenarios

Field	Application
Research Universities	Biped locomotion, dynamics, control theory experiments
Robotics Labs	Algorithm testing, reinforcement learning, SLAM integration
Startups	Humanoid concept development, rapid prototyping
Industrial R&D	Biped testing for logistics, inspection, bionic engineering
Education	Robotics teaching, competitions, hardware programming

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For Robot Development

The ENGINEAI SA01 Bipedal Robot Platform delivers a rare combination of complete openness, high mechanical performance, and real-world expandability. With a 12-DOF biped structure, straight-knee gait technology, aerospace-grade chassis, and fully transparent control stack, it is built for researchers and innovators who require a platform that does not limit exploration.

Useful Links:

1. Top 10 Humanoid Robots 2025 Worldwide
2. IRON: XPENG’s Cutting-Edge Humanoid Robot
3. Zhongqing(EngineAi) Official Website