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Anonymous Poster #1

Why the Current Ratings Are Not Same

03/07/2012 12:57 AM

I saw two motors . both were 160 kw rating, but their current ratings are respectively 249 amps and the other one is 270 amps. how it is possible? efficiency,power factor,are same but their RPM are 2940 and 1460.
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pnaban
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Join Date: Jun 2010
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#1

Re: Why the Current Ratings Are Not Same

03/07/2012 8:17 AM

As the low speed motors have more number of poles the copper loss,magnetization(edy/hysterisis)loss etc will be high.

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wareagle
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Location: Alabama
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#2

Re: Why the Current Ratings Are Not Same

03/07/2012 11:26 AM

http://www.elec-toolbox.com/Formulas/Motor/mtrform.htm
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born2engineer
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Join Date: Feb 2011
Location: India
Posts: 19
#3

Re: Why the Current Ratings Are Not Same

03/08/2012 4:38 AM

Sorry for saying this first you must study what is meant by voltage, Ampere, Watts. Then go for motors working principle in detail what is meant by poles, Why they are using then you will get the answer.

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sharath4
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#4

Re: Why the Current Ratings Are Not Same

03/14/2012 7:13 AM

What is the voltage rating of both motors?

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