Own Manufacturing Network
Shenzhen & Dongguan supplier coordination — motor, reducer, encoder, QC, and export under one program.
Quasi-direct-drive actuator selection
QDD Actuators for Robot Joints That Need Torque and Backdrivability
Compare quasi-direct-drive modules by peak and RMS torque, reducer ratio, reflected inertia, backdrive feel, thermal duty, encoder interface, and mechanical envelope before you request samples.
Inquiry Email
Include robot type, joint location, torque/speed/voltage targets, quantity, and destination.
Instant Chat
+86 18857971991
Send QDD actuator specs, STEP files, or actuator references for engineering review.
Torque-Speed Window
Compare peak torque, RMS torque, speed, voltage, current, and duty cycle together.
Validation Risks
Review backdrive feel, reflected inertia, temperature rise, backlash, and impact load early.
Review Documents
Send envelope drawings, STEP references, interface needs, and sample acceptance checks.
Product families
QDD Actuator Modules for Every Robot Joint
Compare product families by architecture, torque class, and integration style. Each family page includes detailed specs, validation guidance, and RFQ checklists.
QDD Robot Actuators
Integrated quasi-direct-drive modules for dynamic robot joints.
Low-ratio planetary · High backdrivability · OEM-ready
Backdrivable Actuators
Low-impedance joints for legged robots and exoskeletons.
Force-control friendly · Impact-tolerant · Torque-transparent
Hollow-Shaft Actuators
Through-bore routing for clean cable management.
Coaxial design · Compact packaging · Custom bore sizes
High Torque-Density
Maximum torque in minimum volume for weight-critical platforms.
Compact envelope · Thermal-optimized · Battery-friendly
Low-Ratio Planetary
Robust planetary transmission for shock-tolerant robot joints.
Configurable ratio · Impact-resistant · Production-proven
Representative modules
QDD actuator visuals for early engineering alignment
Use these product references to discuss actuator envelope, output interface, hollow routing, torque density, and robot-joint packaging before selecting a sample path.
Why work with us
From Sample to Production — One Supplier, Full Control
Full Customization
Gear ratio, winding, encoder, connector, housing, and branding — from 1pc prototype to volume.
Flexible MOQ
Sample from 1 pc. Small batch from 5 pcs. Volume pricing available with annual forecast.
Fast Delivery
Standard samples 5–7 days. Custom samples 2–3 weeks. Batch production 3–5 weeks.
OEM & customization
Custom Ratio, Winding, Encoder, Connector, Housing & Branding
From 1pc prototype to volume — we support full actuator customization with DFM review, prototype control, quality records, and export delivery.
Engineering Review First
Every RFQ gets a technical fit assessment — torque-speed duty, thermal margin, and integration risks — before any quote.
Prototype to Production
One supplier from concept validation through pilot build to repeat orders. Revision control and outgoing QC included.
Product Selection Snapshot
Compare major QDD actuator families before opening a detailed technical discussion.
- Best fit
- Best for robotics teams comparing QDD joint modules for prototype validation and later batch production.
- Key metric
- Torque class: 14–60 Nm continuous, 36–200 Nm peak across families
- Best fit
- Best for teams prioritizing compliance, controllability, and disturbance response over maximum static holding stiffness.
- Key metric
- Backdrive torque: 0.3–1.5 Nm unpowered (6:1 planetary), <0.5 Nm target for exoskeletons
- Best fit
- Best for mechanical engineers choosing a reducer architecture for responsive robot joints.
- Key metric
- Backlash: 5–15 arcmin (single-stage planetary), 3–8 arcmin (precision grade)
- Best fit
- Best for robot mechanical teams constrained by cable routing, joint envelope, and serviceability.
- Key metric
- Pass-through envelope: 10–25 mm bore diameter depending on actuator class
- Best fit
- Best for teams trying to reduce joint size or weight without losing torque-control behavior.
- Key metric
- Torque density: 25–50 Nm/kg for integrated QDD modules (varies by motor class)
| Family | Best Fit | 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. |
FAQ
Buyer Questions Before Sample Selection
Send Joint Requirements for Review
Share the joint duty cycle, envelope, interface, quantity plan, and target documents so the first reply can focus on fit, risks, and next sample steps.
Inquiry Email
Include robot type, joint location, torque/speed/voltage targets, quantity, and destination.
Instant Chat
+86 18857971991
Send QDD actuator specs, STEP files, or actuator references for engineering review.