The AK45-10 KV75 has a higher torque constant (0.127 N·m/A against 0.104 N·m/A), draws less current at its rating (2.1 A against 3 A), and is narrower (53 mm against 61.2 mm). The AKE50-8 KV110 has more peak torque (7.5 N·m against 7 N·m), is lighter (190 g against 260 g) and shallower (22.5 mm against 43 mm), and turns faster at the output (240 RPM against 150 RPM). They match on continuous torque.
The AK45-10 KV75 is US$134 and the AKE50-8 KV110 is US$190. That is US$53.60 per rated N·m for the AK45-10 KV75 and US$76.00 per rated N·m for the AKE50-8 KV110.
| AK45-10 KV75 | AKE50-8 KV110 | |
|---|---|---|
| Reduction Ratio | 10:1 | 8:1 |
| Rated Torque (N·m) | 2.5 | 2.5 |
| OD (mm) | 53 | 61.2 |
| Weight (g) | 260 | 190 |
| Peak Torque (N·m) | 7 | 7.5 |
| Rated Voltage (V) | 24 | 24 |
| Rated Speed (RPM) | 150 | 240 |
| No-Load Speed (RPM) | 180 | 320 |
| Rated Current (A) | 2.1 | 3 |
| Peak Current (A) | 5 | 9 |
| Maximum Torque Density (N·m/kg) | 26.9 | — |
| Height (mm) | 43 | 22.5 |
| Backlash (arcmin) | 18 | 9 |
| Kv (RPM/V) | 75 | 110 |
| Kt (N·m/A) | 0.127 | 0.104 |
| Ke (V/kRPM) | 13.33 | 7 |
| Phase to Phase Resistance (mΩ) | 2200 | — |
| Phase to Phase Inductance (μH) | 1330 | — |
| Rotor Inertia (g·cm²) | 89 | 153.81 |
| Motor Constant (N·m/√W) | 0.0858 | 0.097 |
| Mechanical Time Constant (ms) | 0.6 | — |
| Pole Pairs | 14 | 14 |
| Number of Slots | 24 | 24 |
| Winding Type | Delta | — |
| Number of Encoder | 1 | — |
| Inner Loop Encoder Type | Magnetic Encoder | — |
| Inner Ring Encoder Resolution | 14bit | — |
| CAN Connector | A1257WR-S-3P | — |
| UART Connector | A1257WR-S-3P | — |
| Power Connector | XT30PW-M | — |
| Temperature Sensor | NTC MF51B 103F3950 | — |
| Noise dB (65cm away the motor) | 60 | 65 |
| Basic Dynamic Load Rating Cr (N) | 2810 | 1100 |
| Basic Static Load Rating C0r (N) | 2760 | 840 |
| Operation Ambient Temperature | -20℃~50℃ | -20℃~50℃ |
| Insulation Level | C | F |
| Driving Way | FOC | FOC |
| Application | Legged Robot, Exoskeleton, AGV | Exoskeleton, Robotic Arm |
| Maximum Torque Weight Ratio (N·m/kg) | — | 39.5 |
| Max Continuous Power (W) | — | 65 |
| Backdrivable Torque (N·m) | — | 0.09 |
| Phase Resistance (mΩ) | — | 792 |
| Phase Inductance (μH) | — | 560 |
| Dielectric Strength | — | 500V |
| Insulation Resistance | — | 500V 10MΩ |
Rows the two disagree on are marked; the figures are CubeMars'. To put any other two parts side by side, build your own comparison.