The CubeMars RO100‑KV55 Lite w/o Hall is a lightweight, high-torque-density frameless outrunner torque motor designed for applications demanding compact integration, reduced weight, and robust performance.
This Lite version eliminates the Hall sensors and front-end structural components to simplify construction, reduce cost, and lower overall mass—while retaining the core advantages of ultra-low cogging torque and a large-diameter hollow shaft for versatile mechanical integration.
Operating at a rated voltage of 48 V, it delivers a continuous torque of ~4 N·m and a peak torque of up to 12 N·m, all within a total weight of just 525 g. Its streamlined profile makes it ideal for space-constrained, high-response applications such as robotic joints, collaborative arms, and exoskeleton systems.
Motor Dimensions: Φ108.3 × 28 mm
Weight: 525 g
Peak Torque: 12 N·m
No-Load Speed: 2550 rpm
Ultra-Low Cogging Torque: Cogging torque reduced by ~50% compared to similar-class motors, significantly improving smoothness during low-speed operation
Large Hollow Bore: Generous central through-hole supports cable routing, direct shaft coupling, or harmonic drive integration—maximizing mechanical design flexibility
Lightweight Lite Design: Removal of Hall sensors and non-essential components reduces weight to ~525 g, enabling easier integration into end-effectors and compact joints
Highly Integrated Pivot Architecture: Optimized for robotic joints, collaborative arms, and exoskeletons where high torque, fast response, and minimal footprint are critical
w/o Hall Configuration: Simplified sensorless design suits systems with moderate feedback requirements but strong emphasis on weight savings and high torque density
RO100‑KV55 Lite w/o Hall Frameless Outrunner Torque Motor ×1
Certificate of Conformance ×1
High Adaptability
Large Hollow
stability
lifespan
temperature
orientation| RO100 KV55 Standard Version |
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| RO100 KV55 Lite Version |
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| 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 | ||
| category | Model | Rated Voltage (V) | 最大持续功率W | Rated Torque (Nm) | Rated Current (A) | Rated Speed (RPM) | Peak Torque (Nm) | Peak Current (A) | No-load Speed (RPM) | Phase to Phase Resistance (mΩ) | Phase to Phase Inductance (μH) | Pole Pairs | Weight (G) | Size (diameter *length) MM | Hall Sensor | Temperature Sensor |
| RO Series Frameless Outrunner Torque Motor | RO100 KV55-Standard-with-hall | 48 | 838 | 4 | 20 | 2000 | 12 | 62 | 2550 | 143 | 137 | 21 | 710 | Ф113.5*36.2 | Yes | Yes |
| RO Series Frameless Outrunner Torque Motor | RO100 KV55 Lite without hall | 48 | 838 | 4 | 20 | 2000 | 12 | 62 | 2550 | 143 | 137 | 21 | 525 | Ф108.3*28 | No | No |
| RO Series Frameless Outrunner Torque Motor | RO80 KV105-Standard-with-hall | 48 | 490 | 1.3 | 15 | 3600 | 4 | 50 | 5040 | 120 | 103 | 21 | 352 | Ф92.6*26.4 | Yes | Yes |
| RO Series Frameless Outrunner Torque Motor | RO80 KV105 Lite without hall | 48 | 490 | 1.3 | 15 | 3600 | 4 | 50 | 5040 | 120 | 103 | 21 | 265 | Ф88.6*17.7 | No | No |
| RO Series Frameless Outrunner Torque Motor | RO60 KV115-Standard-with-hall | 48 | 352 | 0.8 | 8.5 | 4200 | 2.4 | 40 | 5520 | 300 | 395 | 14 | 248 | Ф73.8*23 | Yes | Yes |
| RO Series Frameless Outrunner Torque Motor | RO60 KV115 Lite without hall | 48 | 352 | 0.8 | 8.5 | 4200 | 2.4 | 40 | 5520 | 300 | 395 | 14 | 195 | Ф70.5*15 | No | No |
