The CubeMars RO100‑KV55 Standard is a high-performance frameless outrunner torque motor engineered for demanding applications such as robotic joints, exoskeletons, collaborative robot arms, medical devices, and aerospace systems.
Operating at a rated voltage of 48 V, it features an ultra-low cogging torque design and a large-diameter hollow shaft—enabling flexible integration options including through-hole wiring, direct shaft coupling, or direct connection to harmonic drives. Equipped as standard with Hall sensors and a temperature sensor, the motor delivers precise rotor position feedback and real-time thermal monitoring for enhanced control accuracy and system safety.
With a continuous torque of ~4 N·m and a peak torque of up to ~12 N·m, the RO100‑KV55 delivers robust power in a compact, lightweight package (710 g), making it ideal for high-dynamics robotic platforms requiring smooth motion and high reliability.
Motor Dimensions: Φ113.5 × 36.2 mm
Weight: 710 g
Peak Torque: 12 N·m
No-Load Speed: 2550 rpm
Ultra-Low Cogging Torque: Cogging torque reduced by ~50% compared to conventional motors, ensuring exceptionally smooth low-speed operation and improved motion fidelity
Large Hollow Bore Structure: Central aperture supports cable routing, direct shaft integration, or gearbox coupling—greatly enhancing mechanical design versatility
Standard Hall + Temperature Sensors: Enable accurate commutation and real-time thermal protection, significantly improving system reliability and operational safety
High Torque Output: Continuous torque of ~4 N·m and peak torque up to ~12 N·m meet the demands of high-power joint actuation and dynamic robotic tasks
Broad Application Compatibility: Well-suited for exoskeletons, collaborative arms, medical robots, quadrupedal platforms, and lightweight automated systems
RO100‑KV55 Standard Hall-with 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 Sensor Wire | 30#AWSilicone Wire100±5mm Tinning5±2mm | Lead-Out | Three-Phase Motor Lead-Out: Enameled Wire Straight Out 100±5mm Tinned5±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 |
| Winding Type | 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 Tinned 5±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 |
