---
title: "TQ-RoboDrive ILM85x26 specs"
description: "Frameless + Driver actuator from TQ-Systems (RoboDrive) (Germany). Peak torque 9.4 Nm, rated 2.9 Nm, weight 670 g, torque density 14 Nm/kg, price $810."
canonical: https://actuatorlist.com/actuators/tq-robodrive-ilm85x26
last-updated: 2026-11-01T14:05:43.000Z
---
# TQ-RoboDrive ILM85x26 by TQ-Systems (RoboDrive)

> Frameless + Driver actuator from TQ-Systems (RoboDrive) (Germany). Peak torque 9.4 Nm, rated 2.9 Nm, weight 670 g, torque density 14 Nm/kg, price $810.

## Specifications

| Spec | Value |
| --- | --- |
| Category | Frameless + Driver |
| Peak torque | 9.4 Nm |
| Rated torque | 2.9 Nm |
| Max speed | 5400 rpm |
| Gear ratio | 1:1 |
| Weight | 670 g |
| Torque density | 14 Nm/kg |
| Price | $810 |
| Price per Nm | $86.5 |
| Backdrivable | yes |
| Backlash | n/a |
| Voltage | 48 V |
| Peak current | n/a |
| Communication | n/a |
| Control modes | n/a |
| Encoder | None (frameless stator/rotor kit; add own sensor) |
| Integrated driver | no |
| Availability | in production |
| Data status | Catalog headline specs spot-checked: confirm revision |

## Size a joint

- [Motor torque calculator](/tools/motor-torque-calculator?solve=power&t=2.9&n=5400): **1640 W** of shaft power at its rated 2.9 N·m and 5400 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=0.67,0.5,0&p=2): **32.6 N·m** at the shoulder with its 670 g at the elbow of a 2 kg-payload arm.
- [Humanoid robot actuators](/guides/humanoid-robot-actuators#wrist): **1 of 7 joints** within its rated torque, up to the wrist at 1 N·m.

## Use cases

- robot arm
- cobot
- humanoid joint
- exoskeleton

## Notes

Motor. Frameless hollow-shaft servo kit, dia 85 x 26 mm. TQ-RoboDrive ILM datasheet gives rated torque 2.9 N.m, peak torque 9.37 N.m (at 20% deviation from linearity), and kit weight 670 g for the ILM85x26. Kt 73 mNm/A at 20C, Km 0.52 Nm/sqrt(W), rated current 39.8A (delta-parallel), terminal resistance 27 mOhm, inductance 87 uH, no-load speed 5400 rpm. High-end frameless kit for cobot/humanoid joints; needs external FOC driver. Price is approximate: the TQ RoboDrive shop lists EUR 704.38 per kit for up to 10 pcs for the ILM85x26 VSS (star-serial winding, no sensors; checked Oct 2026), converted at about 1.15 USD/EUR. Other windings are configured on the same page.

## Sources

- [https://www.tq-group.com/en/products/tq-robodrive/servo-kits/ilm85x26/](https://www.tq-group.com/en/products/tq-robodrive/servo-kits/ilm85x26/)
- [https://www.tq-group.com/filedownloads/files/products/robodrive/data-sheets/en/DRVA\_DB\_Servo-Kits\_ILM\_EN\_Rev0414\_Web.pdf](https://www.tq-group.com/filedownloads/files/products/robodrive/data-sheets/en/DRVA_DB_Servo-Kits_ILM_EN_Rev0414_Web.pdf)
- [https://robodriveshop.tq-group.com/en/ILM85x26-VSS/304397-286842](https://robodriveshop.tq-group.com/en/ILM85x26-VSS/304397-286842)

## Similar Frameless + Driver actuators

- [EC frameless 90 flat (260 W) (maxon)](https://actuatorlist.com/actuators/maxon-ec-frameless-90-flat-260w): 12 Nm/kg
- [RI60 KV120 (CubeMars (T-Motor))](https://actuatorlist.com/actuators/cubemars-ri60-kv120): 10.5 Nm/kg
- [RI80 V2.0 KV75 (CubeMars (T-Motor))](https://actuatorlist.com/actuators/cubemars-ri80-v2-kv75): 10 Nm/kg
- [R60 KV115 (CubeMars (T-Motor))](https://actuatorlist.com/actuators/cubemars-r60-kv115): 9.3 Nm/kg
- [iPower GM8112-80T (iPower Motor (iFlight))](https://actuatorlist.com/actuators/ipower-gm8112-80t): 2.1 Nm/kg

## Catalog comparisons

Catalog specifications and source caveats, not compatibility recommendations.

- [RI80 V2.0 KV75 vs TQ-RoboDrive ILM85x26](/comparisons/cubemars-ri80-v2-kv75-vs-tq-robodrive-ilm85x26)
- [EC frameless 90 flat (260 W) vs TQ-RoboDrive ILM85x26](/comparisons/maxon-ec-frameless-90-flat-260w-vs-tq-robodrive-ilm85x26)

[Browse actuator comparisons](/compare).

## Machine-readable

- JSON: https://actuatorlist.com/api/v1/actuators/tq-robodrive-ilm85x26
- Catalog index for agents: https://actuatorlist.com/llms.txt