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Alternator , generator efficiency

by Mr.Bomzh
Tags: alternator, efficiency, generator
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Mr.Bomzh
#1
Mar8-14, 04:08 PM
P: 90
Hi I've been looking in google although I can't find a definitive answer, what are the usual efficiency range for alternators, some talk about brushed ones in the range of 50 to 60 % , brushelss some say go as highas 75%, maybe some of you folks know from your experience what are the typical efficiency of a power station generator for example, does the efficiency increase with size?
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russ_watters
#2
Mar8-14, 04:53 PM
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It does increase with size and power stations run on the order of 95%.
Alkemist
#3
Mar9-14, 04:36 PM
P: 67
Quote Quote by Mr.Bomzh View Post
Hi I've been looking in google although I can't find a definitive answer, what are the usual efficiency range for alternators, some talk about brushed ones in the range of 50 to 60 % , brushelss some say go as highas 75%, maybe some of you folks know from your experience what are the typical efficiency of a power station generator for example, does the efficiency increase with size?
You may want to read this thread http://www.physicsforums.com/showthr...=738434&page=4
It doesn't give the complete answer, but discuss about generator efficiency. Generators are never high efficient machines.

jim hardy
#4
Mar9-14, 11:40 PM
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Alternator , generator efficiency

I believe you'll find power plant alternators can beat 98%.
They do tricks like use compressed hydrogen for cooling because hydrogen being less dense than air takes less power to pump .
Utility would prefer to sell that energy as electricity than dump it as heat.
Here's a Toshiba link offering 99%.
http://www3.toshiba.co.jp/power/engl...s/hydrogen.htm

In a car alternator the only incentive for efficiency is there's less heat to get rid of, so efficiency lets you reduce heat transfer area which means a more compact unit.
With today's smaller engines and fuel economy mandates there's probably increased attention to efficiency - but in my day everybody had 400 cubic inches and a half acre engine compartment..
http://www.moparmusclemagazine.com/f.../photo_01.html



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