What are degrees of freedom (DoF) in a robot?
Degrees of freedom count the independent joint motions a robot can make — a common shorthand for how articulate an arm or humanoid is.
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Definition
Degrees of freedom (DoF) are the number of independent motions a mechanism can make. In robotics marketing and datasheets, DoF usually means how many independently actuated joint axes the arm, leg or hand has.
How it works
Each revolute or prismatic joint that the controller can command adds one DoF. Kinematics and dynamics get harder as DoF rises; planners and learned policies must coordinate more axes.
Why it matters
When a company cites "31 DoF" for a humanoid or a millimeter-precise dexterous hand, it is signaling articulation budget — not automatically real-world reliability.
Frequently asked questions
Is higher DoF always better?
More DoF adds dexterity and also control, cost and failure points. Designers match DoF to the task.
How is DoF counted?
Usually each independent actuated joint axis counts as one DoF (revolute or prismatic).
Example?
A classic 6-DoF industrial arm reaches most poses in its workspace; humanoid hands often advertise 10–20+ finger DoF for grasping.
Coverage
BYD's humanoid design patent surfaces while a formal debut waits
China's IP office published BYD's embodied-intelligent-robot design patent on Oct 9, 2026 — a bipedal look aimed at service, education and industry — but the company has still not formally unveiled the product.
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