Frameless Torque Motor / RI100 KV105

RI100 KV105 Frameless Torque Motor

A high-precision inner-rotor frameless motor with strong torque density, ultra-low cogging and a large hollow bore – built to embed directly into robotic joints and mechanisms.

4.95 Nm

Peak Torque

1.76 Nm

Rated Torque

4368 rpm

No-load Speed

500 g

Weight

Product Overview

Compact frameless power

The CubeMars RI100 KV105 is an inner-rotor, frameless torque motor from the RI series – a high-precision brushless DC joint motor engineered for industrial automation and advanced robotics such as exoskeletons, quadruped robots, robotic arms and collaborative manipulators.

Its width and thickness are optimised and support flexible customisation for seamless integration into tight assemblies. The motor excels in torque delivery and motion-control precision, staying efficient while providing stable, responsive output with a plug-and-play design that simplifies installation and maintenance.

Highlights

Engineered in detail

A closer look at the design, control and integration of the RI100 KV105.

Low Cogging, Smooth Running

Advanced electromagnetic optimisation delivers silky-smooth low-speed motion.

Hand-Wound Precision

A carefully wound stator gives consistent, delicate high-performance output.

Curved Permanent Magnets

Optimised magnet geometry raises torque density and efficiency.

Heightened Rotor Option

A taller rotor variant offers extra torque for more demanding joints.

Encoder-Ready Design

Optional Hall-sensor integration and flexible mounting for closed-loop control.

Technical Specifications

RI100 KV105 Specifications

Verified CubeMars manufacturer specifications for the RI100 KV105.

Peak torque4.95 Nm

Rated torque1.76 Nm

No-load speed2184/3276/4368 rpm

Rated speed1370/2100/2825 rpm

KV105 rpm/V

Torque constant (Kt)0.129 Nm/A

Back-EMF (Ke)10.47 V/krpm

Rated voltage24/36/48 V

Rated current13.6 A

Peak current38.6 A

Phase resistance126 mOhm

Phase inductance366.7 uH

Pole pairs14

Motor constant (Km)0.3634 Nm/sqrtW

Rotor inertia215.5 gcm2

Mechanical time constant0.16 ms

Electrical time constant2.91 ms

Max torque density9.9 Nm/kg

Hollow shaft bore45 mm

Motor dimensionsD104 x 26 mm

Weight500 g

Winding typeDelta

Operating temperature-20 to 50 C

Drive methodFOC

Applications

Where the RI100 works

Built for compact, high-precision rotary joints.

Collaborative Arms

Embeddable joint motor for precise manipulator motion.

Exoskeletons

Lightweight, high-torque joints for wearable robotics.

Robotic Joints

Direct-drive articulation for legged and quadruped robots.

Precision Automation

Smooth, responsive rotation for automation equipment.

Ready to integrate the RI100 KV105?

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