How do I know whether a QDD actuator fits my joint?

Start with joint location, continuous and peak torque, speed, voltage, duty cycle, packaging envelope, and required backdrive behavior. A QDD module is strongest when dynamic response and torque transparency matter more than maximum static stiffness.

Which data matters more than peak torque?

RMS torque, thermal rise, reducer ratio, reflected inertia, backlash, friction, encoder resolution, bus latency, bearing load path, and cable routing usually decide whether the actuator survives the real robot cycle.

What should I send for a useful engineering review?

Send robot type, joint location, torque-speed-voltage targets, mechanical envelope or STEP reference, communication interface, encoder preference, expected duty cycle, quantity forecast, destination, and timeline.

Can samples be reviewed before a batch decision?

Yes. Sample review should cover torque-speed behavior, backdrive feel, temperature rise, backlash, wiring, mounting, and any documents needed for internal approval.

Can the module be customized later?

Gear ratio, winding, shaft, hollow routing, encoder, connector, cable assembly, housing, brake, and branding requirements can be reviewed once the joint-level constraints are clear.

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

[email protected]

Email app

Include robot type, joint location, torque/speed/voltage targets, quantity, and destination.

Instant Chat

+86 18857971991

Chat on WhatsApp

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.

Integrated 36 Nm QDD actuator module for high-torque robot joints

Integrated robot dog joint actuator module for quadruped platforms

Flange-output robot joint actuator module for mechanical interface review

Hollow rotary actuator module for cable-routing and compact joint review

Why work with us

From Sample to Production — One Supplier, Full Control

Own Manufacturing Network

Shenzhen & Dongguan supplier coordination — motor, reducer, encoder, QC, and export under one program.

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.

View OEM capabilities Send RFQ

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.

105Nm Robotic Actuator Module

Best fit: Robotics engineers and system integrators who need to screen a 105 Nm target class and verify a specific module configuration before integration.
Key metric: Torque class shown on this page: 105 Nm target class; rating definition and peak duration require supplier confirmation

105Nm Quasi-Direct Drive Actuator

Best fit: Robotics R&D Engineer / Humanoid Startup CTO looking for customizable QDD modules with verified torque-to-weight ratio and backdrivability.
Key metric: Peak Torque: 105 Nm (at peak phase current, short duration)

QDD Robot Actuators

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

Backdrivable Actuators

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

Low-Ratio Planetary Actuators

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)

Hollow-Shaft QDD Actuators

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

High-Torque-Density Actuators

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
105Nm Robotic Actuator Module	Robotics engineers and system integrators who need to screen a 105 Nm target class and verify a specific module configuration before integration.	Torque class shown on this page: 105 Nm target class; rating definition and peak duration require supplier confirmation	Torque capability depends on speed, current, pulse duration, and thermal conditions; confirm the quoted configuration before selection.
105Nm Quasi-Direct Drive Actuator	Robotics R&D Engineer / Humanoid Startup CTO looking for customizable QDD modules with verified torque-to-weight ratio and backdrivability.	Peak Torque: 105 Nm (at peak phase current, short duration)	Determines the dynamic acceleration and payload support capability of legged robots during jump or high-load stance phases.
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.