Quasi-direct-drive brushless servo: outrunner motor with 6x planetary reduction and integrated high-rate FOC controller communicating over CAN-FD
Motion & Actuation · Integrated planetary actuator
qdd100 beta 3
This record freezes the third beta revision of the mjbots quasi-direct-drive servo. The official page is unusually explicit about torque-versus-time behaviour, publishing a four-step torque-duration ladder down to an indefinite 3.3 N·m point under one stated thermal condition. The page also states the unit is not currently stocked and carries a 50-unit minimum order.
mjbots qdd100 beta 3 · Also: qdd100, qdd100 beta 3 servo
11 known suppliers in this product family.
Motor, reduction, feedback and drive electronics sold as an integrated or near-integrated robot-joint product. The list is bounded to the current RCI manufacturer-directory universe and separates exact-model audited suppliers from confirmed product-line suppliers.
EXACT-MODEL AUDITED
8 suppliers
HEBI Robotics · ROBOTIS · CubeMars · MYACTUATOR · Unitree Robotics · mjbots · FEETECH · Damiao
PRODUCT-LINE CONFIRMED
3 suppliers
INNFOS · MAB Robotics · Synapticon
This is a bounded discovery set, not a claim to enumerate every company worldwide. Open the full supplier landscape and official routes →
What this record can support today.
Coverage is computed from published, non-unknown fields. It measures the record—not product quality—and makes missing procurement evidence explicit.
Engineering field coverage64%
7 of 11 selected fields published
- Official product sourcepublished
- Lifecycle statepublished
- Mechanical dimensions / mass / mountingpublished
- Environmental operating limitsmissing
- Continuous or rated outputpublished
- Peak / momentary outputmissing
- Speed boundarypublished
- Transmission ratio / errorpublished
- Electrical input / consumptionpublished
- Control and communication interfacemissing
- Position / torque feedbackmissing
Procurement field coverage15%
2 of 13 selected fields published
- Official product / sales routepublished
- Lifecycle statepublished
- Exact orderable SKU / part numbermissing
- Price with region, currency and quantitymissing
- Lead time with check datemissing
- Commercial availability / stock statemissing
- Minimum order quantitymissing
- Authorized distributor / sales channelmissing
- CAD / STEP / interface drawingmissing
- Certification with identifiermissing
- MTBF / failure / reliability datamissing
- Warranty termsmissing
- PCN / EOL / replacement noticemissing
Coverage measures whether a selected public field is present with non-U evidence. It is not a product score, compatibility result, certification, availability confirmation or procurement recommendation. Download the complete readiness coverage JSON →
1 bounded physical-evidence record.
Publisher independence, identity precision and measurement scope vary by row. Results remain bounded by the disclosed specimen, setup, workload and metric; an inconclusive mapping is evidence associated with the catalog model, not verification of a manufacturer claim.
| Measured result | Conditions | Claim mapping | Source |
|---|---|---|---|
| Independent real-system experimentindependent_physical_evidence | Sixteen exact actuators operated in a physical soft-arm test platformQDD100 beta 3 servos drove the arm while payload, stiffness and grasp behavior were experimentally evaluated. | inconclusiveThe record establishes bounded physical evidence for the named model, but the experiment does not reproduce the catalogued claim metric and conditions; the claim remains inconclusive. | Torque Responsive Metamaterials Enable High Payload Soft Robot Arms ↗Fabrication and physical test sections Checked 2026-08-26 |
Reported values, conditions attached.
Evidence state describes the claim—not the prestige of the company or document.
| Claim | Reported value | Condition / boundary | State | Source |
|---|---|---|---|---|
| Peak torqueheadline_torque | 16 N·m | Endpoint held for less than 1 s, “measured at zero speed, ambient 20C lab, 24V input, no airflow or heatsink until limiting occurs”; not a continuous operating point. | M · Manufacturer claimed | mjbots qdd100 beta 3 servo product page ↗Specifications list and availability banner on the product page · Live official Shopify product page observed 2026-08-18 Checked 2026-08-19 |
| Indefinite-duration torquecontinuous_torque | 3.3 N·m | Published as “3.3 Nm - Indefinite” under the same stated condition: zero speed, ambient 20°C lab, 24 V input, no airflow or heatsink until limiting occurs. | M · Manufacturer claimed | mjbots qdd100 beta 3 servo product page ↗Specifications list and availability banner on the product page · Live official Shopify product page observed 2026-08-18 Checked 2026-08-19 |
| Intermediate torque-duration stepstorque_endurance | 10 N·m for 60 s; 6 N·m for 400 s | Same stated measurement condition as the peak and indefinite points. | M · Manufacturer claimed | mjbots qdd100 beta 3 servo product page ↗Specifications list and availability banner on the product page · Live official Shopify product page observed 2026-08-18 Checked 2026-08-19 |
| Peak speedspeed | 3,600 dps at 36 V; 2,300 dps at 24 V | Peak endpoints; they cannot be combined with the torque figures into one operating point. | M · Manufacturer claimed | mjbots qdd100 beta 3 servo product page ↗Specifications list and availability banner on the product page · Live official Shopify product page observed 2026-08-18 Checked 2026-08-19 |
| Planetary reductiongear_ratio | 6x | The official accessory page describes the M0.5 steel gearset as “for a 6x planetary gearbox, like used in the qdd100”; the qdd100 beta 3 product page itself does not restate the ratio. | M · Manufacturer claimed | mjbots M0.5 6x Reduction Planetary Gearset product page ↗Product description identifying the 6x planetary gearbox as used in the qdd100 · Live official accessory page observed 2026-08-18 Checked 2026-08-19 |
| Weightmass | 507 g | Manufacturer specification. | M · Manufacturer claimed | mjbots qdd100 beta 3 servo product page ↗Specifications list and availability banner on the product page · Live official Shopify product page observed 2026-08-18 Checked 2026-08-19 |
| Envelopedimensions | 100 mm outer diameter × 44 mm thickness | Manufacturer specification. | M · Manufacturer claimed | mjbots qdd100 beta 3 servo product page ↗Specifications list and availability banner on the product page · Live official Shopify product page observed 2026-08-18 Checked 2026-08-19 |
| Backlashbacklash | ±0.25 ° | Manufacturer specification; test method is not disclosed. | M · Manufacturer claimed | mjbots qdd100 beta 3 servo product page ↗Specifications list and availability banner on the product page · Live official Shopify product page observed 2026-08-18 Checked 2026-08-19 |
| Voltage input rangeinput_voltage | 10–44 V | Manufacturer specification. | M · Manufacturer claimed | mjbots qdd100 beta 3 servo product page ↗Specifications list and availability banner on the product page · Live official Shopify product page observed 2026-08-18 Checked 2026-08-19 |
| Peak powerpeak_power | 500 W | Peak value; no continuous power rating is published. | M · Manufacturer claimed | mjbots qdd100 beta 3 servo product page ↗Specifications list and availability banner on the product page · Live official Shopify product page observed 2026-08-18 Checked 2026-08-19 |
| Communication and control ratecommunications | 5 Mbps CAN-FD; 15–30 kHz control rate | Manufacturer specification; register protocol and host tooling must still be fixed for one robot. | M · Manufacturer claimed | mjbots qdd100 beta 3 servo product page ↗Specifications list and availability banner on the product page · Live official Shopify product page observed 2026-08-18 Checked 2026-08-19 |
| Connectorsconnectors | 2× XT-30 (power); 2× JST PH-3 (data) | Manufacturer specification. | M · Manufacturer claimed | mjbots qdd100 beta 3 servo product page ↗Specifications list and availability banner on the product page · Live official Shopify product page observed 2026-08-18 Checked 2026-08-19 |
| Published availability statusavailability | NOT CURRENTLY STOCKED, MINIMUM ORDER QTY 50 | Availability banner on the official product page on the verification date; contact address given as [email protected]. | M · Manufacturer claimed | mjbots qdd100 beta 3 servo product page ↗Specifications list and availability banner on the product page · Live official Shopify product page observed 2026-08-18 Checked 2026-08-19 |
| Independent exact-actuator robot validationindependent_robot_validation | Not published in cited public evidence | RCI checked the cited official public evidence on the verification date.RCI has not received, serialised, loaded, thermally instrumented or endurance-tested a qdd100 beta 3. | U · Unknown | mjbots qdd100 beta 3 servo product page ↗Specifications list and availability banner on the product page · Live official Shopify product page observed 2026-08-18 Checked 2026-08-19 |
Known limits
What this record does not prove.
- All published torque points, including the indefinite 3.3 N·m value, apply only at zero speed, 20°C ambient, 24 V input, no airflow and no heatsink; moving-load and enclosed-joint behaviour is not covered.
- Peak torque and peak speed are endpoints and must not be presented as a simultaneous or continuous operating point.
- The official page states the unit is not currently stocked and carries a 50-unit minimum order; procurement status must be re-verified before design-in.
- No serialised specimen, RCI torque test or thermal test exists for this record.