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What Does Higher Efficiency Really Mean

Posted April 13, 2008 8:39 AM

Are high efficiency motors more energy efficient? Or are there tradeoffs that the engineer needs to take into account? Some engineers suggest that increased efficiencies often come at the cost of higher rotor inertias. The result can be more energy lost during startup and a load that's hard to stop. Cycling applications should be approached with care. Motor efficiency is a moving target that depends on the motor construction, and how it's used. How do you define motor energy efficiency?

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Del the cat Guru Join Date: May 2007 Location: Harlow England Posts: 10338 Good Answers: 207	#1 Re: What Does Higher Efficiency Really Mean 04/13/2008 9:24 AM
	That strikes me as a statement of the glaringly obvious. of course it depends on how the motor is being used. I have a motor which is 100% efficient... (until it you start it...) Del __________________ health warning: These posts may contain traces of nut.

ffej Power-User Join Date: May 2007 Location: Geelong, Australia Posts: 429 Good Answers: 19	#2 In reply to #1 Re: What Does Higher Efficiency Really Mean 04/14/2008 3:25 AM
	Shhhh Del, don't give the game away. Instead why don't you become a consultant yourself. Your technique of making motors 100% efficient seems like a winner (and surely worthy of government money). After all it saves energy, reduces greenhouse gases, improves safety and is equally applicable for all minority groups. __________________ If there's something you don't understand...Then a wizard did it. As heard on "The Simpsons".

Del the cat Guru Join Date: May 2007 Location: Harlow England Posts: 10338 Good Answers: 207	#3 In reply to #2 Re: What Does Higher Efficiency Really Mean 04/14/2008 3:30 AM
	KrisDel^TMare doing extensive research into doing nothing as a green resource. We are have some trouble with the lubriction issues, although beer seems to be a promising avenue of research. If you wish to sign up to this study you are most welcomed. Del __________________ health warning: These posts may contain traces of nut.
	Off Topic (Score 5)

Scapolie Guru Join Date: Jan 2007 Posts: 1054 Good Answers: 8	#4 In reply to #3 Re: What Does Higher Efficiency Really Mean 04/14/2008 4:53 AM
	Hi Del. Try using "Abbot Ale", I have found this ale to have excellent lubricating properties when used liberally. Or you could also try "Newcastle Brown", this ale is best used sparingly otherwise a grating sound will be heard from the inner workings. But my favourite lubricant is Jennings "Sneck Lifter", this ale must be used very sparingly as it has a much higher lubricating property! Yours Faithfully, S. I. Mather.
	Off Topic (Score 5)

HUX Power-User Join Date: Jan 2007 Location: UK S.Northants Posts: 403 Good Answers: 13	#5 Re: What Does Higher Efficiency Really Mean 04/14/2008 5:25 AM
	http://www.abb.co.uk/cawp/seitp202/c1256c290031524bc1256cf7003f391e.aspx I came across this topic about 1999, having never heard of it before. It seems to make sense and it's an easy thing to specify but the problem is either lack of awareness, short term thinking or inertia - that's a human attribute description not related to motors. To answer the question, yes they really are. I had assumed that they would be phased-in (yes it's a pun) over the time period between then and now. But it appears not. Someone will now describe how VFDs are making greater savings and HEMs are not necessary.

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