The AmpFlow A40-300 has powered championship combat robots for years - one of the most popular high-output motors available for a big robot's weapon or drive system. Serious power for builders who aren't kidding around.
A 42-bar commutator and four massive brushes, combined with high-energy 'T9' ferrite magnets, give this motor the efficiency you'd normally expect only from much more expensive rare-earth-magnet motors - while keeping the cost down. Internal capacitors on each brush also cut down on electrical noise, which matters for radio-controlled applications.
| Specs |
| Diameter | 4.0 in |
| Length | 6.9 in |
| Peak Horsepower | 3.8 |
| Stall Torque | 3840 oz-in |
| Efficiency | 84% |
| Nominal Voltage | 24V |
| No-Load RPM | 4000 |
| Shaft Diameter | 5/8 in |
| Shaft Length | 1.75 in |
| Keyway | 3/16 |
| Capacitors | Yes |
| Magnet Type | Ferrite |
| No Load Amps | 3.5 Amps |
| Terminal Resistance | 0.05 Ohms |
| Kt | 8.05 oz-in/Amp |
| Kv | 168 RPM/Volt |
| Weight | 11.9 lbs |
Peak Efficiency Point
| Efficiency |
| Peak Efficiency | 84% |
| RPM at Peak Efficiency | 3700 |
| Torque at Peak Efficiency | 300 oz-in |
| Horsepower at Peak Efficiency | 1.1 HP |
| Current at Peak Efficiency | 41 Amps |
| Current at 500W Output | 25.5 Amps |
| HP Range for 75%+ Efficiency | 0.4 to 2.6 HP |