The RO40 KV140 Lite draws less current at its rating (2.85 A against 3.4 A), is lighter (60 g against 105 g), narrower (46.3 mm against 61.7 mm) and shallower (13 mm against 14.5 mm), and turns faster at the output (2450 RPM against 2100 RPM). The RO50 KV108 Lite has more continuous torque (0.3 N·m against 0.2 N·m), more peak torque (0.9 N·m against 0.6 N·m) and a higher torque constant (0.088 N·m/A against 0.068 N·m/A).
The RO40 KV140 Lite is US$58 and the RO50 KV108 Lite is US$74. That is US$290.00 per rated N·m for the RO40 KV140 Lite and US$246.67 per rated N·m for the RO50 KV108 Lite.
| RO40 KV140 Lite | RO50 KV108 Lite | |
|---|---|---|
| Rated Torque (N·m) | 0.2 | 0.3 |
| OD (mm) | 46.3 | 61.7 |
| Weight (g) | 60 | 105 |
| Peak Torque (N·m) | 0.6 | 0.9 |
| Rated Voltage (V) | 24 | 24 |
| Maximum Torque Weight Ratio (N·m/kg) | 10 | 8.57 |
| Rated Speed (RPM) | 2450 | 2100 |
| No-Load Speed (RPM) | 3400 | 2600 |
| Rated Current (A) | 2.85 | 3.4 |
| Peak Current (A) | 11.6 | 9.3 |
| Height (mm) | 13 | 14.5 |
| Kv (RPM/V) | 141 | 108 |
| Kt (N·m/A) | 0.068 | 0.088 |
| Ke (V/kRPM) | 7 | 9.2 |
| Phase to Phase Resistance (mΩ) | 1700 | 1035 |
| Phase to Phase Inductance (μH) | 580 | 460 |
| Inertia (g·cm²) | 122.11 | 327.21 |
| Mechanical Time Constant (ms) | 2.2 | 2.4 |
| Electrical Time Constant (ms) | 0.34 | 0.44 |
| Pole Pairs | 14 | 14 |
| Operation Ambient Temperature | -20℃~50℃ | -20℃~50℃ |
| Driving Way | FOC | FOC |
| Application | Cobot Arm, Exoskeleton | Cobot Arm, Exoskeleton |
Rows the two disagree on are marked; the figures are CubeMars'. To put any other two parts side by side, build your own comparison.