QDD Humanoid Robot Actuators

Quasi-direct-drive actuator options for humanoid robots that need backdrivable motion, high torque density, and better force-control behavior than high-ratio gearboxes.

Target Buyer:For robotics teams comparing QDD actuators against harmonic, planetary, or cycloidal reducer modules.

Quasi direct drive actuator reference for humanoid robots

Capability Highlights

QDD motor module sourcing for legged robots, humanoid prototypes, and exoskeleton-style joints
Lower reduction ratio path for compliance-aware torque control and impact response
Motor, driver, encoder, and mechanical interface matching for prototype builds

Typical Applications

Backdrivable humanoid joints
Legged robot actuator testing
Force-control and compliance experiments

Engineering Focus

Torque constant, motor inertia, reduction ratio, reflected inertia, and control bandwidth
Encoder resolution and driver current capacity for torque-control experiments
Thermal performance in repeated high-current maneuvers

Key Evaluation Matrix

Metric	Typical Range	Why It Matters
Backdrivability	Architecture and reduction-ratio dependent	Humanoid force control and impact response require different tradeoffs than rigid industrial robot joints.
Driver current headroom	Matched to motor winding and voltage class	QDD performance is often limited by controller current and heat, not only motor geometry.

RFQ Checklist

Desired actuator architecture and benchmark model if available
Continuous and peak torque, speed range, and control bandwidth target
Preferred bus voltage and driver current limit
Encoder resolution, absolute position need, and communication protocol
Sample quantity, robot joint target, and validation timeline

Risk Controls

Buyer expects industrial gearbox precision from a compliance-oriented QDD actuator: Clarify whether the priority is torque control, backdrivability, positional stiffness, or low backlash before selection.
Driver and encoder cannot support the desired control loop: Match motor module, encoder resolution, bus protocol, and controller current during the same selection step.

Product Gallery

Backdrivable robot actuator for force-control experiments

Low voltage BLDC servo driver board for humanoid actuators

Buyer FAQ

When should a humanoid team choose QDD?

QDD is attractive when force-control behavior, backdrivability, and compact torque density are more important than maximum reduction ratio and rigid positioning.

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.

Key Evaluation Matrix

Metric	Typical Range	Why It Matters
Backdrivability	Architecture and reduction-ratio dependent	Humanoid force control and impact response require different tradeoffs than rigid industrial robot joints.
Driver current headroom	Matched to motor winding and voltage class	QDD performance is often limited by controller current and heat, not only motor geometry.

RFQ Checklist

Desired actuator architecture and benchmark model if available

Continuous and peak torque, speed range, and control bandwidth target

Preferred bus voltage and driver current limit

Encoder resolution, absolute position need, and communication protocol

Sample quantity, robot joint target, and validation timeline

Risk Controls

Buyer expects industrial gearbox precision from a compliance-oriented QDD actuator: Clarify whether the priority is torque control, backdrivability, positional stiffness, or low backlash before selection.

Driver and encoder cannot support the desired control loop: Match motor module, encoder resolution, bus protocol, and controller current during the same selection step.