The AK60-39 V3.0 draws less current at its rating (4.5 A against 7 A), is lighter (750 g against 850 g), narrower (79 mm against 98 mm) and shallower (48.5 mm against 61.9 mm), and turns faster at the output (70 RPM against 23/48 RPM). The AK80-64 KV80 has more continuous torque (48 N·m against 24 N·m), more peak torque (120 N·m against 72 N·m) and a higher torque constant (0.136 N·m/A against 0.12 N·m/A).
The AK60-39 V3.0 is US$503 and the AK80-64 KV80 is US$1109. That is US$20.96 per rated N·m for the AK60-39 V3.0 and US$23.10 per rated N·m for the AK80-64 KV80.
| AK60-39 V3.0 | AK80-64 KV80 | |
|---|---|---|
| Reduction Ratio | 39:1 | 64:1 |
| Rated Torque (N·m) | 24 | 48 |
| OD (mm) | 79 | 98 |
| Weight (g) | 750 | 850 |
| Peak Torque (N·m) | 72 | 120 |
| Rated Voltage (V) | 48 Outer Ring Encoder type Magnetic Encoder | 24/48 |
| Rated Speed (RPM) | 70 | 23/48 |
| No-Load Speed (RPM) | 98 | — |
| Rated Current (A) | 4.5 | 7 |
| Peak Current (A) | 17 | 19 |
| Maximum Torque Density (N·m/kg) | 96 | — |
| Height (mm) | 48.5 | 61.9 |
| Backlash (arcmin) | 15 | — |
| Back Drive (N·m) | 1.4 | 4.7 |
| Kv (RPM/V) | 80 | 80 |
| Kt (N·m/A) | 0.12 | 0.136 |
| Ke (V/kRPM) | 12.5 | 13.7 |
| Phase to Phase Resistance (mΩ) | 600 | 220 |
| Phase to Phase Inductance (μH) | 670 | 133.5 |
| Rotor Inertia (g·cm²) | 305 | — |
| Motor Constant (N·m/√W) | 0.15 | — |
| Mechanical Time Constant (ms) | 2.39 | 0.67 |
| Pole Pairs | 14 | 21 |
| Number of Slots | 24 | — |
| Winding Type | Star | Delta Backlash (°) 0.18 |
| Number of Encoder | 2 | 1 |
| Inner Loop Encoder Type | Magnetic Encoder | Magnetic Encoder |
| Inner Ring Encoder Resolution | 21bit | 14bit |
| Outer Ring Encoder Resolution | 21bit | — |
| CAN Connector | A1257WR-S-3P | A1257WR-S-4P |
| UART Connector | XT30PW-M | A1257WR-S-4P |
| Temperature Sensor | NTC MF51B 103F3950 | NTC MF51B 103F3950 |
| Basic Dynamic Load Rating Cr (N) | 2000 | — |
| Basic Static Load Rating C0r (N) | 2520 | — |
| 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) | — | 0.29 |
| Maximum Torque Weight Ratio (N·m/kg) | — | 141.2 |
| Inertia (g·cm²) | — | 564.5 |
| Electrical Time Constant (ms) | — | 0.61 |
| Power Connector | — | XT30PW-M |
Rows the two disagree on are marked; the figures are CubeMars'. To put any other two parts side by side, build your own comparison.