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 > Nerd Department Major Alternator Design Improvement

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MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 11/08/18 12:25pm Link  |  Quote  |  Print  |  Notify Moderator

https://www.sae.org/publications/technical-papers/content/2017-01-1228/

Not quite the Holy Grail

But close...

Chris Bryant

Arden, North Carolina

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Posted: 11/08/18 02:18pm Link  |  Quote  |  Print  |  Notify Moderator

A 10% increase in efficiency is pretty extraordinary. If I understand correctly, they are basically doing active rectification, rather than passive- turning it on for the positive wave and off for negative (and vice versa).


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theoldwizard1

SE MI

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Posted: 11/08/18 03:55pm Link  |  Quote  |  Print  |  Notify Moderator

Chris Bryant wrote:

A 10% increase in efficiency is pretty extraordinary. If I understand correctly, they are basically doing active rectification, rather than passive- turning it on for the positive wave and off for negative (and vice versa).

True, but this requires some IMHO "tricky" synchronization !

Big Katuna

Deland, FL

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Posted: 11/08/18 04:48pm Link  |  Quote  |  Print  |  Notify Moderator

Sounds like a switching power supply. MOSFETS (we are scraping some cobwebs off here) share well, don’t go into thermal runaway and have lower voltage drop than rectifiers. Sensitive to spurious base voltages but I’m guessing they have gotten better since the mid 80s. [emoticon]


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Wild Bill 888

Denver

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Posted: 11/09/18 03:59am Link  |  Quote  |  Print  |  Notify Moderator

It is a good idea, but the wording is too vague for me. If the starting point was 70% efficiency, a 10% increase is no big deal.

If they said the overall efficiency is over 96 % from 50 to 90% of Rated power, that would be impressive.

theoldwizard1

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Posted: 11/09/18 06:15am Link  |  Quote  |  Print  |  Notify Moderator

Wild Bill 888 wrote:

It is a good idea, but the wording is too vague for me. If the starting point was 70% efficiency, a 10% increase is no big deal.

10% IS a big deal when there basically have been no improvement in alternator efficiency in many, MANY years.

You would be surprised how much the auto companies are willing to spend to get 1/2 MPG !

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