QDD actuators

Joint modules for robots
that walk and lift.

The QA series pairs a high-pole-count Gwaihir stator with a single-stage planetary reduction, absolute encoder, and FOC-ready phase leads — one bolt circle, one connector, one characterized torque curve.

First articles H1 2027 Frameless variants available
QA-81 · LIMB 36N40P 81 mm stator lamination cross-section ⌀81 MM STATOR REV A.1
01 — Limb joints

QA-81

Knee, elbow, and shoulder modules for humanoid and legged platforms — high torque density with the backdrivability quasi-direct-drive is chosen for.

Stator ⌀
81MM
Peak torque
32NM
Reduction
9:1PLANETARY
Stator stack
Gwaihir AS-81-36 · 36-slot · bonded Si-steel
Rotor shell
Gwaihir RE-81-40 · 40-pole aluminum extrusion
Configuration
36N40P outrunner · single-stage 9:1 planetary
Torque
32 Nm peak · 11 Nm continuous
Bus voltage
24–48 V DC
Feedback
19-bit absolute encoder · output side
Mass
850 g module · 620 g frameless kit
Request QA-81 first articles
QA-100 · HIP / COBOT 36N42P 100 mm stator lamination cross-section ⌀100 MM STATOR REV A.1
02 — Load-bearing joints

QA-100

Hip and shoulder joints, cobot base and waist axes, exoskeleton drives — the load-bearing end of the actuator problem.

Stator ⌀
100MM
Peak torque
65NM
Reduction
9:1PLANETARY
Stator stack
Gwaihir AS-100-36 · 36-slot · bonded Si-steel
Rotor shell
Gwaihir RE-100-42 · 42-pole aluminum extrusion
Configuration
36N42P outrunner · single-stage 9:1 planetary
Torque
65 Nm peak · 24 Nm continuous
Bus voltage
48 V DC
Feedback
19-bit absolute encoder · output side
Mass
1.45 kg module · 1.05 kg frameless kit
Request QA-100 first articles
Inside every QA module
01
Gwaihir stator + shell
Catalog AS/RE parts — the same steel you can buy bare, wound and magnetized here.
02
Planetary reduction
Single-stage 9:1, backdrivable, ground gears — QDD ratios, not harmonic-drive stiffness games.
03
Absolute encoder
19-bit output-side absolute position, no homing routine on power-up.
04
FOC-ready leads
Phase leads and thermistor broken out for your drive — or ask about the integrated-driver variant.
Building airframes instead?
BU-series drone motors
Four propulsion sizes — 32, 35, 43, and 60 mm — from tiny-whoop to 25 kg cargo platforms, on the same Gwaihir steel.
BU-32 · BU-35 · BU-43 · BU-60
See drone motors