The AK70-9 V3.0 KV60 without driver has more peak torque (29.2 N·m against 25 N·m), draws less current at its rating (6.25 A against 6.9 A), is lighter (540 g against 570 g) and narrower (89 mm against 98 mm), and turns faster at the output (260 RPM against 243 RPM). The AK80-8 KV60 without driver has more continuous torque (10 N·m against 8.5 N·m) and a higher torque constant (0.199 N·m/A against 0.159 N·m/A), and is shallower (43.9 mm against 49 mm).
The AK70-9 V3.0 KV60 without driver is US$447 and the AK80-8 KV60 without driver is US$526. That is US$52.59 per rated N·m for the AK70-9 V3.0 KV60 without driver and US$52.60 per rated N·m for the AK80-8 KV60 without driver.
| AK70-9 V3.0 KV60 without driver | AK80-8 KV60 without driver | |
|---|---|---|
| Reduction Ratio | 9:1 | 8:1 |
| Rated Torque (N·m) | 8.5 | 10 |
| OD (mm) | 89 | 98 |
| Weight (g) | 540 | 570 |
| Peak Torque (N·m) | 29.2 | 25 |
| Rated Voltage (V) | 48 | 48 |
| Rated Speed (RPM) | 260 | 243 |
| No-Load Speed (RPM) | 320 | — |
| Rated Current (A) | 6.25 | 6.9 |
| Peak Current (A) | 23.8 | 21 |
| Maximum Torque Density (N·m/kg) | 54 | — |
| Height (mm) | 49 | 43.9 |
| Backlash (arcmin) | 18 | — |
| Back Drive (N·m) | 0.8 | 0.75 |
| Kv (RPM/V) | 60 | 60 |
| Kt (N·m/A) | 0.159 | 0.199 |
| Ke (V/kRPM) | 16.7 | 19.8 |
| Phase to Phase Resistance (mΩ) | 475 | 430 |
| Phase to Phase Inductance (μH) | 408 | 214 |
| Rotor Inertia (g·cm²) | 450 | — |
| Motor Constant (N·m/√W) | 0.23 | — |
| Mechanical Time Constant (ms) | 1.7 | 0.66 |
| Pole Pairs | 21 | 21 |
| Number of Slots | 24 | — |
| Winding Type | Delta | Star Backlash (°) 0.38 |
| Number of Encoder | 2 | 2 |
| Inner Loop Encoder Type | Magnetic Encoder | Magnetic Encoder |
| Inner Ring Encoder Resolution | 14bit | 14bit |
| Outer Ring Encoder Type | Magnetic Encoder | Magnetic Encoder |
| Outer Ring Encoder Resolution | 15bit | 15bit |
| CAN Connector | A1257WR-S-4P | A1257WR-S-4P |
| UART Connector | A1257WR-S-3P | A1257WR-S-4P |
| Power Connector | XT30PW-M | XT30PW-M |
| Temperature Sensor | NTC MF51B 103F3950 | NTC MF51B 103F3950 |
| Noise dB (65cm away the motor) | 50 | — |
| Basic Dynamic Load Rating Cr (N) | 1890 | — |
| Basic Static Load Rating C0r (N) | 2140 | — |
| Operation Ambient Temperature | -20℃~50℃ | -20℃~50℃ |
| Insulation Level | C | — |
| Driving Way | FOC | FOC |
| Application | Legged Robot, Exoskeleton, AGV | Legged Robot, Exoskeleton, AGV |
| Motor Constant Km (N·m/√W) | — | 0.30 |
| Maximum Torque Weight Ratio (N·m/kg) | — | 35 |
| Inertia (g·cm²) | — | 608.6 |
| Electrical Time Constant (ms) | — | 0.5 |
Rows the two disagree on are marked; the figures are CubeMars'. To put any other two parts side by side, build your own comparison.