The AK70-10 KV100 without driver is narrower (89 mm against 98 mm). The AK80-8 KV60 without driver has more continuous torque (10 N·m against 8.3 N·m), more peak torque (25 N·m against 24.8 N·m) and a higher torque constant (0.199 N·m/A against 0.123 N·m/A), draws less current at its rating (6.9 A against 7.2 A), is lighter (570 g against 621 g) and shallower (43.9 mm against 50.25 mm), and turns faster at the output (243 RPM against 148/310 RPM).
The AK70-10 KV100 without driver is US$447 and the AK80-8 KV60 without driver is US$526. That is US$53.86 per rated N·m for the AK70-10 KV100 without driver and US$52.60 per rated N·m for the AK80-8 KV60 without driver.
| AK70-10 KV100 without driver | AK80-8 KV60 without driver | |
|---|---|---|
| Reduction Ratio | 10:1 | 8:1 |
| Rated Torque (N·m) | 8.3 | 10 |
| OD (mm) | 89 | 98 |
| Weight (g) | 621 | 570 |
| Peak Torque (N·m) | 24.8 | 25 |
| Motor Constant Km (N·m/√W) | 0.24 | 0.30 |
| Rated Voltage (V) | 24/48 | 48 |
| Rated Speed (RPM) | 148/310 | 243 |
| Rated Current (A) | 7.2 | 6.9 |
| Peak Current (A) | 23.2 | 21 |
| Maximum Torque Weight Ratio (N·m/kg) | 47.6 | 35 |
| Height (mm) | 50.25 | 43.9 |
| Back Drive (N·m) | 0.48 | 0.75 |
| Kv (RPM/V) | 100 | 60 |
| Kt (N·m/A) | 0.123 | 0.199 |
| Ke (V/kRPM) | 11.2 | 19.8 |
| Phase to Phase Resistance (mΩ) | 272 | 430 |
| Phase to Phase Inductance (μH) | 113 | 214 |
| Inertia (g·cm²) | 414 | 608.6 |
| Mechanical Time Constant (ms) | 0.74 | 0.66 |
| Electrical Time Constant (ms) | 0.42 | 0.5 |
| Pole Pairs | 21 | 21 |
| Winding Type | Delta Backlash (°) 0.12 | Star Backlash (°) 0.38 |
| Number of Encoder | 1 | 2 |
| Inner Loop Encoder Type | Magnetic Encoder | Magnetic Encoder |
| Inner Ring Encoder Resolution | 14bit | 14bit |
| CAN Connector | A1257WR-S-4P | A1257WR-S-4P |
| UART Connector | A1257WR-S-4P | A1257WR-S-4P |
| Power Connector | XT30PW-M | XT30PW-M |
| Temperature Sensor | NTC MF51B 103F3950 | NTC MF51B 103F3950 |
| Operation Ambient Temperature | -20℃~50℃ | -20℃~50℃ |
| Driving Way | FOC | FOC |
| Application | Legged Robot, Exoskeleton, AGV | Legged Robot, Exoskeleton, AGV |
| Outer Ring Encoder Type | — | Magnetic Encoder |
| Outer Ring Encoder Resolution | — | 15bit |
Rows the two disagree on are marked; the figures are CubeMars'. To put any other two parts side by side, build your own comparison.