Induction Motor Characteristics

[ycliff]

Does anyone know of a reputable source for induction motor characteristics such as common efficiency and power factor values? I know that the ieee colored books (the red one on protection i think...) has some information on this - unfortunately I do not have access to these books? Suggestions for where to look?

 

[waross]

My first resource on motor information is the Cowern Papers on the Baldor motor web site. The Cowern Papers are sometimes a little difficult to find, but worth the effort.
Almost any manufacturer's web site will have efficiency and power factor listed for their motors. You may achieve more accurate results by looking up the information for the size and type motor you are particularly interested in.
For example,
25 Hp, 1760 RPM, TEFC, Hi Efficiency, 230/460 volts, 60 hz., etc.
yours

 

[ycliff]

Yes. I'm mainly looking for very general motor characteristics. I do not have information about each and every motor. ie: General PF, Effy, and X/R ratios for induction motors with a certian HP and voltage rating, that type of thing.

 

[cuky2000]

Beware that motor efficiency dependent upon loading, power quality, and ambient temperature. Here is a generic figure for standard motor size and efficiency a full load.

10 HP 89.5%
25 HP 92.4%
50 HP 93.0%
100 HP 94.5%
200 HP 95.0%

 

[ycliff]

thanks...yes i'm just looking for typical values. do you mind me asking where you got this data from? (just curious for future reference and so that I can back up any information that I use).

 

[cuky2000]

The data above was from a DOE publication. The table below from other source found in the net shows similar values.

The link page is:

http://images.google.com/imgres?img...&hl=en&lr=&rls=SUNA,SUNA:2005-47,SUNA:en&sa=N

 

[powerjunx]

huh, nice source cuky! you may emphasize that corresponding efficiency is running the machine at full load, else, efficiency can not be attained! Then, it will leave as figure.