---
title: "mjbots qdd100 beta 3 specs"
description: "QDD / Proprioceptive actuator from mjbots (United States). Peak torque 16 Nm, rated 3.3 Nm, weight 507 g, torque density 31.6 Nm/kg, price $879."
canonical: https://actuatorlist.com/actuators/mjbots-qdd100
last-updated: 2026-11-01T14:05:43.000Z
---
# qdd100 beta 3 by mjbots

> QDD / Proprioceptive actuator from mjbots (United States). Peak torque 16 Nm, rated 3.3 Nm, weight 507 g, torque density 31.6 Nm/kg, price $879.

## Specifications

| Spec | Value |
| --- | --- |
| Category | QDD / Proprioceptive |
| Peak torque | 16 Nm |
| Rated torque | 3.3 Nm |
| Max speed | 383 rpm |
| Gear ratio | 6:1 |
| Weight | 507 g |
| Torque density | 31.6 Nm/kg |
| Price | $879 |
| Price per Nm | $54.9 |
| Backdrivable | yes |
| Backlash | 15 arcmin |
| Voltage | 10-44 V |
| Peak current | n/a |
| Communication | CAN-FD |
| Control modes | position, velocity, torque |
| Encoder | on-board magnetic absolute |
| Integrated driver | yes |
| Availability | unknown |
| Data status | Catalog headline specs spot-checked: confirm revision |

## Size a joint

- [Motor torque calculator](/tools/motor-torque-calculator?solve=power&t=3.3&n=383): **132 W** of shaft power at its rated 3.3 N·m and 383 rpm.
- [Robot arm torque calculator](/tools/robot-arm-torque-calculator?L=0.4,0.35,0.12&m=1.2,0.8,0.3&a=0.507,0.5,0&p=2): **32 N·m** at the shoulder with its 507 g at the elbow of a 2 kg-payload arm.

## Use cases

- quadruped leg
- legged robot
- robot arm

## Notes

Open-source QDD servo built on the moteus controller (CAN-FD, 5 Mbps). Thermal-limited torque at 24V: 16 Nm peak (\<1s), 10 Nm for 60s, 6 Nm for 400s, 3.3 Nm indefinitely (rated\_torque\_nm uses the indefinite figure). Peak speed 2300 dps (~383 rpm) at 24V, 3600 dps at 36V; backlash +/-0.25 deg (~15 arcmin), input 10-44V. Net weight 507 g per the beta 3 product page (the original beta was 470 g). The mjbots product page lists a regular price of $879 (currently out of stock, MOQ 50); price\_per\_nm uses the 16 N.m peak torque, matching the dataset convention. Marked beta by the vendor.

## Sources

- [https://mjbots.com/products/qdd100-beta-3](https://mjbots.com/products/qdd100-beta-3)
- [https://blog.mjbots.com/2021/02/04/qdd100-beta-2/](https://blog.mjbots.com/2021/02/04/qdd100-beta-2/)
- [https://mjbots.com/collections/qdd100](https://mjbots.com/collections/qdd100)

## Similar QDD / Proprioceptive actuators

- [GIM8108-8 (Steadywin)](https://actuatorlist.com/actuators/steadywin-gim8108-8): 58.7 Nm/kg
- [AK10-9 (V3.0 KV60) (CubeMars (T-Motor))](https://actuatorlist.com/actuators/cubemars-ak10-9): 55.2 Nm/kg
- [AK70-10 (KV100) (CubeMars (T-Motor))](https://actuatorlist.com/actuators/cubemars-ak70-10): 47.6 Nm/kg
- [AK80-9 (V3.0 KV100) (CubeMars (T-Motor))](https://actuatorlist.com/actuators/cubemars-ak80-9): 45.4 Nm/kg
- [GO-M8010-6 (Unitree)](https://actuatorlist.com/actuators/unitree-go-m8010-6): 44.7 Nm/kg

## Catalog comparisons

Catalog specifications and source caveats, not compatibility recommendations.

- [AK60-6 (V3.0 KV80) vs qdd100 beta 3](/comparisons/cubemars-ak60-6-vs-mjbots-qdd100)
- [AK70-10 (KV100) vs qdd100 beta 3](/comparisons/cubemars-ak70-10-vs-mjbots-qdd100)
- [AK80-6 (KV100) vs qdd100 beta 3](/comparisons/cubemars-ak80-6-vs-mjbots-qdd100)
- [qdd100 beta 3 vs GIM6010-8](/comparisons/mjbots-qdd100-vs-steadywin-gim6010-8)
- [qdd100 beta 3 vs CyberGear Micromotor](/comparisons/mjbots-qdd100-vs-xiaomi-cybergear)

[Browse actuator comparisons](/compare).

## Machine-readable

- JSON: https://actuatorlist.com/api/v1/actuators/mjbots-qdd100
- Catalog index for agents: https://actuatorlist.com/llms.txt