Quote:
Originally Posted by serialk11r
It's impractical to swap in a high quality permanent magnet electric motor in as an alternator.
The auto alternator design is sort of reasonable for the application. Denso square windings have lower copper losses and active synchronous rectification reduces the rectifier losses. To generate higher current efficiently, generating a higher voltage at the alternator then stepping it down is more efficient.
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To quote the paper:
"...truck operating under the following scenario:
2,000 hours / year operation
100 amps average electrical current (14V system)
$4/gallon fuel cost
In this case it will cost over $1,000/year to generate on-board electricity. The
fuel cost difference between a 50% and 60% efficient alternator under this scenario is over $250/year.
So yes its impractical, but worth it maybe?
More Practical:
- As alternators seem to be most efficient at 2000 to 3000 rpm (from the paper) a simple ratio change for the alternator may be worthwhile?
- Switch off power to the rotor during acceleration if battery's charged enough?
- Aero modding the fan doodat, or 3D printing one?
- Cool air duct also seems to help some? (from the paper)
- Direct coupling to crankshaft end?
Anyone done any of these??