CubeMars RI115-PH KV40 Motor
CubeMars RI115-PH KV40 Motor
Product Description
The RI115-PH KV40 is a potted frameless inrunner torque motor from CubeMars’ RI series, engineered for high-reliability applications in space-constrained systems such as robotic joints, exoskeletons, collaborative arms, wheeled robots, and mobile platforms.
Utilizing advanced potting technology, the motor enhances mechanical robustness, thermal endurance, and long-term operational stability. Its electromagnetic design has been optimized to deliver approximately 25% higher torque and power density compared to conventional designs.
With a continuous torque of 5.5 N·m, peak torque up to 16 N·m, and compact dimensions of Φ115 × 38.1 mm, the RI115-PH KV40 offers a premium drive solution that balances performance, reliability, and spatial efficiency.
Core Specifications
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Motor Dimensions: Φ115 × 38.1 mm
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Hollow Bore Diameter: 74 mm
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Weight: 1108 g
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Peak Torque: 16 N·m
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No-Load Speed: 1920 rpm @ 48V
Product Highlights
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Potted Construction: Encapsulation of windings and internal components with potting compound significantly improves mechanical integrity and environmental resilience (e.g., against moisture, dust, and vibration)
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High Torque Density: Optimized magnetic circuit and winding layout enable higher torque and power output within a compact envelope
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Integrated Hall + Temperature Sensors: Provide accurate commutation and real-time thermal monitoring for enhanced control precision and system safety
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Refined Structural Design: Stator yoke thickness reduced by 30%, resulting in a slimmer profile ideal for embedded or flush-mount installations
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Flexible Integration: Frameless architecture allows users to customize support structures, flanges, and drivetrain interfaces for tailored mechanical integration
Packaging Contents
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RI115-PH KV40 Frameless Motor ×1
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Certificate of Conformance ×1








| PRODUCT PARAMETERS | |||
| Characteristics Overview | |||
| Hall Distribution Angle | 120 electrical degrees | Operating Environment | -20℃~+85℃ |
| Dielectric Strength | 1000VAC/1S | Insulation Class | Class H |
| Insulation Resistance | 100MΩ, 500VDC | ||
| Electric Parameters | |||
| Motor Weight (g) | 1108 | Speed Constant (RPM/V) | 40 |
| Voltage (V) | 48 | Motor Constant (N·m/√w) | 0.66 |
| Continuous Torque (N·m) | 5.5 | Inertia (g·cm²) | 3461 |
| Peak Torque (N·m) | 16 | Number of Pole Pairs | 20 |
| Max Speed at Continuous Torque (RPM) |
1430 | Phase Resistance (mΩ) | 134 |
| Continuous Current (A) | 20 | Phase Inductance (μH) | 245 |
| Peak Current (A) | 52 (Ref) | Maximum Torque-to- Weight Ratio (N·m/kg) |
15 |
| Torque Constant (N·m/A) | 0.29 | Electrical Time Constant (ms) | 0.0018 |
| Back EMF Constant (V/RPM) | 0.025 | Electromechanical Time Constant (ms) | 0.0008 |





