The CubeMars RO100 KV55 Lite is a high-performance frameless brushless DC outrunner motor, engineered specifically for robotics, cobot joints, exoskeletons, and medical and aviation devices. As part of the advanced RO Series, this motor stands out with its enhanced torque, ultra-low cogging, and innovative hollow through-hole design—offering superior integration within tight and demanding spaces.
Building on the robust foundation of the R Series, the RO100 KV55 Lite incorporates a larger hollow shaft for maximum flexibility, lightweight aluminum alloy construction for impact and corrosion resistance, and integrated Hall and temperature sensors for real-time feedback and protection. Its ultra-low cogging torque and high efficiency (up to 92.6%) make it ideal for precision applications where smooth and reliable motion is critical.
Highlights
• Rated voltage 48V - KV55
• Ultra-low cogging torque
• Increased large hollow through-hole design
• High adaptability, switch the shaft for versatile usage
• Rated torque 4Nm
• Equipped with Hall and temperature sensors
• Mainly used in exoskeleton robots, collaborative robotic arms, as well as in medical and aerospace fields.
Features
Ultra-Low Cogging Torque
The RO series motor exhibits 50% lower tooth count torque compared to the R series, ensuring smoother operation at low speeds.
Large Hollow Through-Hole
In comparison to the GL series, the RO series motor boasts a larger hollow diameter, adapting flexibly to various diameter requirements, allowing for versatile applications with a simple shaft replacement.
Integrated Temperature and Hall Sensors
Real-time monitoring of motor temperature prevents damage due to abnormal temperatures, and precise positioning control is provided through Hall sensors.
Aluminum Alloy Housing
The rotor of the RO series adopts an aluminum alloy housing, enhancing impact resistance, corrosion resistance, and providing various customization possibilities for appearance. This also improves transparency in controlling raw material costs.
Easy Installation
Stator features pin holes for easy assembly, and the product is equipped with magnetic pins and screws, greatly simplifying the installation process.
UNVEILING A NEW ICON
the entirely redesigned RO Series
High Adaptability & Large Hollow
ULTRA-LOW COGGING TORQUE
A 50% reduction in cogging torque compared to products of the same level offering a silky-smooth new experience
LARGE HOLLOW THROUGH-HOLE DESIGN
Featuring a reserved large-diameter hollow through-hole, providing flexible and versatile usage;
Simply replace the shaft to meet different hollow requirements, achieving a one-motor-multiple-uses scenario
HIGH EFFICIENCY STABLE & RELIABLE
The RO series utilizes high-grade magnets for peak motor efficiency, reaching up to 92.6%
Enhanced temperature adaptability, improved operational stability, and extended lifespan
RO Lite
Streamlined Engineering for Lightweight Performance
BUILT-IN TEMPERATURE HALL SENSORS
Real-time monitoring of motor temperature providing precise rotor position and speed information, ensuring precise motor control
Technical Drawing
RO100 KV55 Standard Version
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RO100 KV55 Lite Version
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Specification
RO100 KV55 Standard Version
|
| Application |
Cobot Arm |
Insulation Class |
F |
| Driving Way |
FOC |
Insulation High-Voltage |
500V |
| Operation Ambient Temperature |
-20℃~50℃ |
Insulation Resistance |
10MΩ |
| Winding Type |
star |
Cogging Torque |
55N.mm |
| Pole Pairs |
21 |
Inertia |
8700gcm² |
| Maximum Torque Weight Ratio |
16.9Nm/kg |
Weight |
710g |
| Rotor Weight |
324g |
Stator Weight |
356g |
| Hall Temperature SensorWire |
30#AWSilicone Wire100±5mm
Tinning5±2mm |
Lead-Out |
Three-Phase Motor Lead-Out:
Enameled Wire StraightOut
100±5mm Tinned 5±2mm |
| Three-Phasewire |
4.5mm |
|
|
RO100 KV55 Lite Version
|
| Application |
Cobot Arm |
Insulation Class |
F |
| Driving Way |
FOC |
Insulation High-Voltage |
500V |
| Operation Ambient Temperature |
-20℃~50℃ |
Insulation Resistance |
10MΩ |
| WindingType |
star |
Cogging Torque |
55N.mm |
| Pole Pairs |
21 |
Inertia |
5290gcm² |
| Rotor Weight |
190g |
Weight |
525g |
Maximum Height of Enameled
WireBulge |
7mm |
Stator Weight |
335g |
| Three-Phasewire |
4.5mm |
Lead-Out |
Three-Phase Motor Lead-Out:
Enameled Wire Straight Out
100±5mm Tinned5±2mm |
| Electric Parameters |
| Rated Voltage |
48V |
Ke |
18.67V/krpm |
| No-Load Speed |
2550rpm |
Phase To Phase Resistance |
143mΩ |
| Rated Torque |
4Nm |
Phase To Phase Inductance |
137μH |
| Rated Speed |
2000rpm |
Km |
0.53Nm/√W |
| Rated Current |
20ADC |
Mechanical Time Constant |
1.73ms |
| Peak Torque |
12Nm |
Electrical Time Constant |
0.96ms |
| Peak Current |
62ADC |
Kt |
0.2Nm/A |
| Kv |
55rpm/V |
|
|
Links
Resource
RO100 drawing.pdf
RO100_KV55.zip
RO100-KV55-lite.pdf
RO100-KV55-lite.zip
RO100 Test Fixture.zip
Effective Date: August 7, 2025
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