CubeMars RI80 V2.0 KV75 Motor
CubeMars RI80 V2.0 KV75 Motor
Product Description
The RI80 V2.0 KV75 frameless torque motor is an inner-rotor, frameless motor from CubeMars’ RI series. Through advanced electromagnetic optimization, it achieves a high slot fill ratio and delivers exceptional power density. With no housing or end caps—retaining only the essential stator and rotor components—it reduces volume by over 30% compared to conventional framed motors of equivalent power. This makes it ideal for embedded installation in space-constrained applications such as robotic arm joints and precision rotary platforms.
The rotor can be directly and rigidly coupled to the load (e.g., shafts or turntables), eliminating intermediate transmission elements like gears or belts. This direct-drive architecture avoids mechanical losses and precision degradation, achieving power transmission efficiency exceeding 95%, while also minimizing component wear and maintenance requirements.
The stator features a modular design, allowing customization of mounting dimensions and fixation methods based on specific application needs. The rotor is compatible with various load shaft diameters—no additional adapters required—enabling rapid integration into diverse drivetrain systems.
Additionally, the rotor height has been increased by 2 mm to facilitate precise alignment with optional Hall sensors, ensuring accurate magnetic sensing and enabling high-fidelity motion control.
Core Specifications
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Motor Dimensions: Φ85 × 27 mm
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Hollow Shaft Diameter: 40.5 mm
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Motor Weight: 411 g
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Peak Torque: 4.1 Nm
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No-load Speed: 2960 rpm@48V
Product Highlights
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High Torque Density & Frameless Design: The frameless architecture offers maximum flexibility for structural integration, empowering users to tailor mounting solutions to their exact mechanical layout
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Ultra-Low Cogging Torque: Optimized electromagnetic structure ensures exceptional smoothness and stability even at very low speeds
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Compact Form Factor for Easy Integration: Designed for seamless embedding into robotic joints, rotating axes, and other tight-space mechanisms
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High Customizability: The frameless configuration allows users to freely design support flanges, drive interfaces, encoder mounts, and other mechanical features according to their system requirements
Packaging Contents
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RI80 V2.0 KV75 Frameless Motor ×1
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Certificate of Conformance ×1
| PRODUCT PARAMETERS | |||
| Parameter | Value | Parameter | Value |
| Application | Cobot Arm/Exoskeleton | Insulation Class | C |
| Driving Way | FOC | Insulation High-Voltage | 1000V 5mA/2s |
| Operation Ambient Temperature | -20°C~50°C | Insulation Resistance | 1000V 10MΩ |
| Winding Type | Delta | Phase | 3 |
| Pole Pairs | 8 | ||
| Rated Voltage(V) | 24/36/48 | Ke(V/krpm) | 15.5 |
| No-Load Speed(rpm) | 1480/2220/2960 | Phase To Phase Resistance(mΩ) | 330 |
| Rated Torque(Nm) | 1.45 | Phase To Phase Inductace(μH) | 510 |
| Rated Speed(rpm) | 1135/1785/2430 | Inertia(gcm²) | 212.49 |
| Rated Current(ADC) | 9.4 | Km(Nm/√W) | 0.2698 |
| Peak Torque(Nm) | 4.1 | Mechanical Time Constant(ms) | 0.29 |
| Peak Current(ADC) | 27.6 | Electrical Time Constant(ms) | 1.55 |
| Kv(rpm/V) | 75 | Weight(g) | 411 |
| Kt(Nm/A) | 0.155 | Maximum Torque Weight Ratio(Nm/Kg) | 9.3 |
| U | Red+16#Silicone Wire | Hv | Blue+30#Silicone Wire |
| V | Yellow+16#Silicone Wire | Hw | Green+30#Silicone Wire |
| W | Blue+16#Silicone Wire | VCC GND | Red+30#Silicone Wire Black+30#Silicone Wire |
| Hu | Yellow+30#Silicone Wire | Correspondence | Hu-U Hv-V Hw-W |