Unitree's Cost and Speed Advantage Stems from QDD Actuator Choice, Not Supplier Squeeze
English summary
A SemiAnalysis article examines how Unitree Robotics achieves cost dominance not by squeezing suppliers but by adopting a more aggressive technical route: QDD (Quasi-Direct Drive) actuators instead of harmonic reducers. This choice trades early reliability risks (overheating, skepticism) for simpler planetary gearboxes, standard industrial components, and diverse suppliers. Iteration speed reaches weekly rather than quarterly cycles. About 200 Chinese humanoid robot companies are now switching to QDD, reinforcing the ecosystem and amplifying Unitree's advantage.
Chinese summary
SemiAnalysis文章分析宇树机器人成本优势并非来自压榨供应链，而是采取了更激进的技术路线：选择QDD（准直驱）执行器而非谐波减速器。这一选择以早期过热等可靠性风险为代价，换来了更简单的行星齿轮箱、标准工业零部件和多元化供应商，迭代速度从季度级提升到周级。目前约200家中国人形机器人公司正转向QDD架构，进一步强化了这一生态系统。
Key points
Unitree chose QDD actuators over harmonic reducers, reducing mechanical complexity and cost.
宇树选择QDD执行器而非谐波减速器，降低了机械复杂度和成本。
The decision accepts early overheating and reliability risks for simpler planetary gearboxes and standard parts.
该决定承受了早期过热等可靠性风险，换来了更简单的行星齿轮箱和标准化零部件。
Supply chain benefits: no reliance on patent-monopolized harmonic reducers, diverse industrial suppliers, and weekly iteration speed.
供应链优势：摆脱谐波减速器的专利垄断，采用多元化工业供应商，实现周级迭代速度。
Approximately 200 Chinese humanoid robot companies are adopting QDD, strengthening the domestic ecosystem.
约200家中国人形机器人公司正在采用QDD，从而强化国内生态系统。