Compare quasi-direct-drive actuator families for dynamic robot joints: backdrivable modules, low-ratio planetary architectures, hollow-shaft layouts, and high-torque-density OEM builds.
Use this page as a pre-RFQ navigator: pick the product family, capture the correct engineering inputs, and move directly to sample validation criteria that buyers can approve.
Product family visuals
The images below are grouped from existing product assets so buyers can quickly separate compact integrated QDD modules, backdrivable legged robot joints, low-ratio gear modules, hollow rotary layouts, and high-torque actuator directions.
Integrated quasi-direct-drive actuator modules for dynamic robot joints that need high torque density, low reflected inertia, and backdrivable behavior.
Best for robotics teams comparing QDD joint modules for prototype validation and later batch production.
QDD actuator platforms for physical interaction, impact absorption, and torque-control workflows where low mechanical impedance matters.
Best for teams prioritizing compliance, controllability, and disturbance response over maximum static holding stiffness.
Compact planetary transmission actuator platforms for QDD robot joints where shock tolerance, packaging, and control response matter.
Best for mechanical engineers choosing a reducer architecture for responsive robot joints.
QDD actuator layouts with hollow or pass-through routing concepts for compact robot joints that need clean cable, hose, or sensor routing.
Best for robot mechanical teams constrained by cable routing, joint envelope, and serviceability.
Compact QDD actuator concepts for robot joints that must balance torque, weight, thermal duty, and controllability in a limited envelope.
Best for teams trying to reduce joint size or weight without losing torque-control behavior.
| Product Family | Primary Buyer Focus | Key Metric | Why It Matters |
|---|---|---|---|
| QDD Robot Actuators | Best for robotics teams comparing QDD joint modules for prototype validation and later batch production. | Torque class: 14–60 Nm continuous, 36–200 Nm peak across families | Separates arm, hip, knee, ankle, and lab platform requirements before samples are selected. |
| Backdrivable Actuators | Best for teams prioritizing compliance, controllability, and disturbance response over maximum static holding stiffness. | Backdrive torque: 0.3–1.5 Nm unpowered (6:1 planetary), <0.5 Nm target for exoskeletons | Shows how much external torque is needed to move the joint without a motor command. |
| Low-Ratio Planetary Actuators | Best for mechanical engineers choosing a reducer architecture for responsive robot joints. | Backlash: 5–15 arcmin (single-stage planetary), 3–8 arcmin (precision grade) | Affects position control, torque ripple, gait smoothness, and repeatability. |
| Hollow-Shaft QDD Actuators | Best for robot mechanical teams constrained by cable routing, joint envelope, and serviceability. | Pass-through envelope: 10–25 mm bore diameter depending on actuator class | Determines whether power, signal, brake, or sensor harnesses can route through the joint. |
| High-Torque-Density Actuators | Best for teams trying to reduce joint size or weight without losing torque-control behavior. | Torque density: 25–50 Nm/kg for integrated QDD modules (varies by motor class) | Directly affects leg mass, robot payload, battery runtime, and joint packaging. |
Buyer resource pages explain what can be requested by RFQ, what inputs are needed before files are released, and how to keep actuator selection, software integration, compliance, and shipment evidence aligned.
Representative QDD actuator module visuals used for product-family evaluation. Final drawings, datasheets, and CAD files are reviewed by RFQ.
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Include robot type, joint location, torque/speed/voltage targets, quantity, and destination.
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