KEDA - B2040-20L
Specifications
- Type: Inrunner
Constants
- kV: 2970
- Rm: 0.146
- Io: 0.8
Io Test Data
Bruce Abbot test results
| Volts | Amps | RPM |
|---|---|---|
| 7 | 0.8 | 0 |
Test Data
Bruce Abbot test results
| Propeller | Gear Ratio | Volts | Amps | Watts | RPM | Speed (mph) | Thrust (g) | Thrust (oz) | RPM as % of Kv*V |
|---|---|---|---|---|---|---|---|---|---|
| GWS EP 4x2.5 | 1 | 7 | 4.8 | 33 | 18710 | 44.3 | 132 | 4.66 | 90% |
| GWS EP 4.5x3 | 1 | 7 | 7.4 | 51 | 17570 | 49.9 | 188 | 6.63 | 85% |
| APC E 4.5x4.1 | 1 | 7 | 9.4 | 65 | 16710 | 64.9 | 186 | 6.56 | 80% |
| APC E 4.7x4.25 | 1 | 7 | 11.1 | 77 | 15970 | 64.3 | 185 | 6.53 | 77% |
| APC E 5.1x4.5 | 1 | 7 | 15.6 | 109 | 13870 | 59.1 | 292 | 10.30 | 67% |
| APC E 5.25x4.75 | 1 | 7 | 14.4 | 100 | 14400 | 64.8 | 247 | 8.71 | 69% |
Comments
Bruce Abbot on 2009-01-14 03:06:04
This inrunner has a 2.3mm shaft and weighs 68g, so it might be a suitable replacement for a 'Speed 400' brushed motor.It is rated for 12A maximum, but with good cooling over the fins it could probably take 15A continuously on 2S Lipo or 6~7 cell NiMH. With 5~10% better efficiency than a brushed 400 it should give a modest performance boost and much longer lifespan.
From the outside my motor looked very nice, but the shaft felt stiff. When tested the no-load current was much higher than expected, so I unscrewed the front end and removed the rotor to see what was wrong. Windings were a bit messy but well packed down, and the airgap was clean. The culprit proved to be a buckled thrust washer.
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From the outside my motor looked very nice, but the shaft felt stiff. When tested the no-load current was much higher than expected, so I unscrewed the front end and removed the rotor to see what was wrong. Windings were a bit messy but well packed down, and the airgap was clean. The culprit proved to be a buckled thrust washer.