CubeMars frameless outrunner torque motor

Frameless Outrunner Torque Motor / RO40 KV140 Lite

RO40 KV140 Lite Frameless Outrunner Torque Motor

An ultra-lightweight Lite frameless outrunner torque motor with ultra-low cogging and a large hollow-through structure for compact, embedded integration.

0.6 Nm

Peak Torque

0.2 Nm

Rated Torque

3400 rpm

No-load Speed

140

Product Overview

Smooth, ultralight torque

The CubeMars RO40 KV140 Lite is the most compact frameless outrunner torque motor in the RO series, weighing just 60 g. Running on 24 V it delivers about 0.2 Nm continuous and up to 0.6 Nm peak torque with a torque density around 10 Nm/kg.

A minimalist Lite design and ultra-low cogging give smooth low-speed operation in a tiny footprint. A large hollow-through structure eases cable routing, and an open thermal design enhances continuous-operation reliability for embedded robotic joints.

Features & Benefits

Smooth, ultralight torque

A minimalist frameless outrunner for embedded, weight-critical integration.

Ultra-Low Cogging

Smooth low-speed motion and better fidelity.

Large Hollow Bore

Flexible cable management or shaft coupling.

Lite and Ultralight

A minimalist design at just 60 g.

Smooth Low-Speed

Optimised electromagnetics for fine control.

Open Thermal Design

Improved continuous-operation reliability.

Frameless

Seamless embedded integration.

Technical Specifications

RO40 KV140 Lite Specifications

Verified CubeMars manufacturer specifications for the RO40 KV140 Lite.

Peak torque0.6 Nm

Rated torque0.2 Nm

No-load speed3400 rpm

Rated speed2450 rpm

KV140 rpm/V

Torque constant (Kt)0.068 Nm/A

Back-EMF (Ke)7 V/krpm

Rated voltage24 V

Rated power51 W

Rated current2.85 A

Peak current11.6 A

Phase-to-phase resistance1700 mOhm

Phase-to-phase inductance580 uH

Pole pairs14

Cogging torque6 mNm

Torque density10 Nm/kg

Winding typeStar

SensorsNone (Lite version)

Insulation classF

Motor dimensionsD46.3 x 13 mm

Weight60 g

Operating temperature-20 to 50 C

Drive methodFOC

Applications

Where the RO40 KV140 Lite works

Built for smooth, reliable direct-drive joints.

Cobot Arms

Smooth, low-cogging joint actuation.

Exoskeletons

Powerful, compact assistive joints.

Quadruped Robots

High-dynamics leg actuation.

Medical Robots

Precise, quiet motion.

Why Choose This Product

Why the RO40 KV140 Lite

Smooth

Ultra-low cogging torque.

Flexible

A large hollow bore and swappable shaft.

Ultralight

A minimalist Lite design.

Support

Robomatek engineering assistance included.

Ready to integrate the RO40 KV140 Lite?

Talk to our robotics specialists for availability, lead time, and integration support.