Unitree R1-7a 7-axis Bionic Dexterous Robotic Arm

Unitree R1-7a is a desktop-class, lightweight 7-axis bionic dexterous robotic arm designed by Unitree Robotics. Built with high-rigidity metal and engineering plastic composites, it functions either as a standalone plug-and-play manipulator or integrated into dual-arm humanoid assemblies like the Unitree R1-A7 Torso Platform.

Unitree R1-7a Robotic Arm Technical Specifications：

* Model: R1 Robotic Arm (7a Version)

* Degrees of Freedom (DoF): 7-Axis (Provides human-like kinematic redundancy)

* Payload Capacity: 2 kg

* Maximum Reach: 650 mm (Measured with a dexterous hand attached)

* Weight: 5.5 kg (Lightweight desktop-friendly profile)

* Power Requirements: 24V - 60V DC

* Communication Interface: XT30 (Power) + CAN485 (Signal)

* Joint Performance: Low-inertia inner-rotor PMSM motors with speeds >180 deg/s

Hardware & Structural Features
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* Advanced Kinematics: The 7-axis architecture allows the arm to bypass singularities, alter elbow orientation without moving the endpoint, and execute obstacle-aware trajectories.

* Joint Engineering: Equipped with crossed-roller and deep-groove ball bearings. It relies on a hollow shaft layout for fully integrated internal wiring to keep lines clear of the workspace.

* Thermal Control: Features localized, active air cooling built directly near the joint motors to handle continuous duty cycles.

Control, Feedback, & Development
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* Hybrid Control Interface: Supports both ultra-precise position control and responsive force control algorithms.

* Sensory Feedback: Features integrated dual absolute encoders on the joints along with native collision detection and force feedback safety logic.

* Software Ecosystem: Fully compatible with an Ubuntu Linux OS host environment and supports open-source secondary development.