Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Automatic alternator cut out/regen braking

Josh8loop · 01-09-2012, 09:57 PM

This is an interesting concept. I believe the goal is to reduce resistive losses in the rotor wiring, and also to reduce eddy current losses. With more modern(2000 plus) vehicles, I wonder how the ECU would handle an open circuit to the field of the alternator? My guess is that it would throw codes for sure.

I like this idea, and coupled with replacing the internal diodes with low forward voltage drop schottkey diodes(perhaps saving as much as 5 watts per diode at certain power outputs), and coating the rotor with epoxy to reduce windage losses(while making sure rotor overheat doesn't become an issue) and you really have something here. If I remember correctly I energized an alternator rotor once, and it used about 36 watts steady state-I realize this will most likely be reduced as the voltage regulator does it's thing, but still thats not too bad!

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01-09-2012, 09:57 PM	#112 (permalink)
Josh8loop Definately a Modder! Join Date: Aug 2011 Location: Port St. Lucie, Florida Posts: 94 Thanks: 5 Thanked 5 Times in 4 Posts	This is an interesting concept. I believe the goal is to reduce resistive losses in the rotor wiring, and also to reduce eddy current losses. With more modern(2000 plus) vehicles, I wonder how the ECU would handle an open circuit to the field of the alternator? My guess is that it would throw codes for sure. I like this idea, and coupled with replacing the internal diodes with low forward voltage drop schottkey diodes(perhaps saving as much as 5 watts per diode at certain power outputs), and coating the rotor with epoxy to reduce windage losses(while making sure rotor overheat doesn't become an issue) and you really have something here. If I remember correctly I energized an alternator rotor once, and it used about 36 watts steady state-I realize this will most likely be reduced as the voltage regulator does it's thing, but still thats not too bad! .. __________________ 2002 VW Jetta TDI 5-speed(completed 01M-5-speed swap at 155K miles) 45 MPG City with the 01M, 5-speed 60+ MPG City. Nokian Entyre Low RR Tires. Experimenting with the "Hybrid" 205 Deg F T-stat: http://forums.tdiclub.com/showthread...=306799&page=4 ..