Custom QDD Humanoid Actuators

Custom quasi-direct-drive humanoid actuator modules for compliant joints that need high torque density, low reflected inertia, backdrivability, and compact mechanical packaging.

Target Buyer:For teams choosing QDD because they need torque response and mechanical compliance, but cannot accept an off-the-shelf actuator envelope.

Custom quasi direct drive humanoid actuator for high torque joints

Capability Highlights

QDD actuator architecture review for legs, arms, wrists, ankles, and compact test joints
Frameless torque motor, low-ratio reducer, dual encoder, driver, and housing integration options
Custom flange, cable-through, hollow-shaft, and thermal interface design for robot body constraints

Typical Applications

Backdrivable humanoid leg joints
Force-control robot arm and wrist joints
Research-to-pilot QDD actuator platforms

Engineering Focus

Balance reduction ratio, motor constant, output speed, current limit, and impact load
Define motor-side and output-side encoder strategy for torque control and position accuracy
Check housing stiffness, bearing support, cable pass-through, and heat rejection in the robot structure

Key Evaluation Matrix

Metric	Typical Range	Why It Matters
Reduction ratio	Low-ratio custom selection	The ratio defines torque multiplication, backdrivability, reflected inertia, and control bandwidth.
Thermal path	Housing and robot-frame dependent	QDD actuators often push high current in compact space, so heat path must be part of the mechanical design.
Encoder topology	Single or dual encoder	Force-control joints need feedback architecture aligned with controller bandwidth and reducer compliance.

RFQ Checklist

Target QDD joint, allowable ratio, peak torque, continuous torque, and desired backdrivability
Motor OD, axial length, hollow-shaft requirement, output bearing load, and cable routing
Encoder layout, driver integration, communication protocol, and calibration expectations
Prototype quantity, test schedule, and pilot production assumptions

Risk Controls

A low-ratio QDD module cannot hold static load without excessive heating: Review static holding duty, brake need, current limit, and expected posture load before freezing the architecture.
Backdrivability target conflicts with stiffness and backlash expectations: Define acceptable compliance, backlash, encoder location, and control strategy as an integrated trade-off.

Product Gallery

Force control actuator module for backdrivable humanoid joints

Dual encoder joint actuator reference for QDD control architecture

Buyer FAQ

Can you customize the QDD actuator diameter and output interface?

Yes. Custom OD, axial length, flange, hollow shaft, output spline, cable exit, and housing features can be reviewed from CAD.

Can the driver be integrated inside the actuator?

It depends on thermal and EMC constraints. We can review integrated-driver, external-driver, or stacked-driver layouts during the feasibility stage.

Related Resources

Inquiry Email

[email protected]

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Include target torque/speed, quantity, and delivery location.

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+8618857971991

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Direct response from our engineering team.

Custom QDD Humanoid Actuators

Custom quasi-direct-drive humanoid actuator modules for compliant joints that need high torque density, low reflected inertia, backdrivability, and compact mechanical packaging.

Target Buyer:For teams choosing QDD because they need torque response and mechanical compliance, but cannot accept an off-the-shelf actuator envelope.

Key Evaluation Matrix

Metric	Typical Range	Why It Matters
Reduction ratio	Low-ratio custom selection	The ratio defines torque multiplication, backdrivability, reflected inertia, and control bandwidth.
Thermal path	Housing and robot-frame dependent	QDD actuators often push high current in compact space, so heat path must be part of the mechanical design.
Encoder topology	Single or dual encoder	Force-control joints need feedback architecture aligned with controller bandwidth and reducer compliance.

RFQ Checklist

Target QDD joint, allowable ratio, peak torque, continuous torque, and desired backdrivability

Motor OD, axial length, hollow-shaft requirement, output bearing load, and cable routing

Encoder layout, driver integration, communication protocol, and calibration expectations

Prototype quantity, test schedule, and pilot production assumptions