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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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#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

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#2
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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.

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Guru
Popular Science - Weaponology - New Member United Kingdom - Member - New Member

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#3
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Re: What Does Higher Efficiency Really Mean

04/14/2008 3:30 AM

KrisDelTM are 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

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#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.

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#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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