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Generators & Electric Motors General Discussion Antique Generators and Old Electric Motors: Questions and answers about restoring and showing old power generation systems.

Generators & Electric Motors General Discussion

Automotive DC Generator - Practical Upper Limit on Output Voltage


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  #31  
Old 07-01-2018, 11:58:49 PM
Railroads Railroads is offline
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Default Re: Automotive DC Generator - Practical Upper Limit on Output Voltage

Interesting, From my experiences with alternator conversions I have discovered a lot of power tools don't like the high frequency AC which is from 200 to 400 HZ. They don't have any issues running on the DC output though. I wonder how well the Power Mite 110 from Fabco actually runs stuff connected to it? Seems Fabco might be better off with the bog standard alternator conversions running 110V DC.

Robert
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  #32  
Old 07-02-2018, 02:53:23 AM
Vanman Vanman is online now
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Default Re: Automotive DC Generator - Practical Upper Limit on Output Voltage

I think that the idea is to normally use it with the engine running "1200 - 1500 rpm" ie keeping the generator around 3600 rpm. It can *withstand* up to 10,000 rpm (ie when the vehicle is being driven) but it doesn't mention a scenario where you would actually be using it while under way. I'm sure you *could*, with the optional voltage regulator, but only for equipment that is not frequency dependent.
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  #33  
Old 07-02-2018, 10:12:25 AM
Radiomike Radiomike is offline
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Default Re: Automotive DC Generator - Practical Upper Limit on Output Voltage

Link to a technical paper on Lundell Alternators

http://citeseerx.ist.psu.edu/viewdoc...=rep1&type=pdf

Mike
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  #34  
Old 07-02-2018, 12:33:35 PM
Railroads Railroads is offline
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Default Re: Automotive DC Generator - Practical Upper Limit on Output Voltage

Mike, They seem to be talking about using power electronics to extract more power from the existing alternator design.


I'd like to see the original drawings and patents for the very first car alternator.

Robert
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  #35  
Old 07-02-2018, 02:40:06 PM
Vanman Vanman is online now
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Default Re: Automotive DC Generator - Practical Upper Limit on Output Voltage

Wow. The efficiency of those generators *alternators* is ghastly!

I'd bet that direct current generators are considerably more efficient. But maybe not due to the low voltage. But if they were operated at similar voltage to the alternating current generator in the test, I'd bet they'd be more efficient.
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  #36  
Old 07-02-2018, 05:13:22 PM
Railroads Railroads is offline
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Default Re: Automotive DC Generator - Practical Upper Limit on Output Voltage

I don't know much about these Mopeco Generators but somehow they play into the vehicle AC generator saga? https://rowleyauctions.hibid.com/lot...-model-bw2400/

Robert
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Old 07-02-2018, 05:55:34 PM
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Default Re: Automotive DC Generator - Practical Upper Limit on Output Voltage

Don't know about the Mopeco, but 200/400 watts sure is an odd rating!

The 800 watt GE looks a lot like those Fabco units. I think those were sold to run off the PTOs of lawn tractors among other uses. That'd be a neat little one to have.
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Old 07-02-2018, 10:40:46 PM
Railroads Railroads is offline
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Default Re: Automotive DC Generator - Practical Upper Limit on Output Voltage

The other generator in that link is actually some kind of propane burner assembly and not a generator. They just don't know squat about any of it apparently.

The 800 watt unit is a Mopeco Model C800. And yes I want one too.

Robert
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Old 07-03-2018, 03:44:49 PM
Railroads Railroads is offline
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Default Re: Automotive DC Generator - Practical Upper Limit on Output Voltage

Prices of the Fabco power mite 110 kit and regulator.

Power-Mite 110 complete kit is $726.00
Voltage regulator PMVR120C IS $308.00
Plus shipping

Can you say sticker shock.

Expensive little thing. Another one to add to the overpriced list is the Premier Power Welder.

I could make something a lot cheaper.

Robert
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Old 07-04-2018, 11:30:06 AM
cornbinder89 cornbinder89 is offline
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Default Re: Automotive DC Generator - Practical Upper Limit on Output Voltage

Yeah, they are over-priced. In the manlift industry, if a customer wanted to order it with the factory order, fine, otherwise we would install a large invertor or a motor-generator (DC motor driving a AC alternator) instead, cheaper and worked as long as you didn't shut off the engine with the basket in the air and run the battery flat!
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