The AKE90-8 KV35 has more continuous torque (55 N·m against 48 N·m), more peak torque (170 N·m against 120 N·m) and a higher torque constant (0.272 N·m/A against 0.136 N·m/A), is shallower (43.5 mm against 61.9 mm), and turns faster at the output (120 RPM against 23/48 RPM). The AK80-64 KV80 draws less current at its rating (7 A against 21 A), and is lighter (850 g against 1400 g) and narrower (98 mm against 107.5 mm).
The AKE90-8 KV35 is US$542 and the AK80-64 KV80 is US$1109. That is US$9.85 per rated N·m for the AKE90-8 KV35 and US$23.10 per rated N·m for the AK80-64 KV80.
| AKE90-8 KV35 | AK80-64 KV80 | |
|---|---|---|
| Reduction Ratio | 8:1 | 64:1 |
| Rated Power (W) | 700 | — |
| Rated Torque (N·m) | 55 | 48 |
| OD (mm) | 107.5 | 98 |
| Weight (g) | 1400 | 850 |
| Peak Torque (N·m) | 170 | 120 |
| Rated Voltage (V) | 48 | 24/48 |
| Rated Speed (RPM) | 120 | 23/48 |
| No-Load Speed (RPM) | 210 | — |
| Rated Current (A) | 21 | 7 |
| Peak Current (A) | 72 | 19 |
| Maximum Torque Weight Ratio (N·m/kg) | 121.4 | 141.2 |
| Height (mm) | 43.5 | 61.9 |
| Kv (RPM/V) | 35 | 80 |
| Kt (N·m/A) | 0.272 | 0.136 |
| Ke (V/kRPM) | 0.0285 | 13.7 |
| Phase to Phase Resistance (mΩ) | 164 | 220 |
| Phase to Phase Inductance (μH) | 235 | 133.5 |
| Mechanical Time Constant (ms) | 2.18 | 0.67 |
| Electrical Time Constant (ms) | 1.4329 | 0.61 |
| Pole Pairs | 21 Inertia (g·cm²） 3377.08 | 21 |
| Winding Type | Delta | Delta Backlash (°) 0.18 |
| Operation Ambient Temperature | (℃) -20℃~50℃ | -20℃~50℃ |
| Driving Way | FOC | FOC |
| Application | Exoskeleton | Legged Robot, Exoskeleton, AGV |
| Motor Constant Km (N·m/√W) | — | 0.29 |
| Back Drive (N·m) | — | 4.7 |
| Inertia (g·cm²) | — | 564.5 |
| Number of Encoder | — | 1 |
| Inner Loop Encoder Type | — | Magnetic Encoder |
| Inner Ring Encoder Resolution | — | 14bit |
| CAN Connector | — | A1257WR-S-4P |
| UART Connector | — | A1257WR-S-4P |
| Power Connector | — | XT30PW-M |
| Temperature Sensor | — | NTC MF51B 103F3950 |
Rows the two disagree on are marked; the figures are CubeMars'. To put any other two parts side by side, build your own comparison.