Electric Motor Efficiency
Electric Motor Efficiency
(OP)
What are typical motor efficiencies? or where can I reference this information?
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Electric Motor Efficiency
|
Electric Motor EfficiencyElectric Motor Efficiency(OP)
What are typical motor efficiencies? or where can I reference this information?
Red Flag SubmittedThank you for helping keep Eng-Tips Forums free from inappropriate posts. Reply To This ThreadPosting in the Eng-Tips forums is a member-only feature.Click Here to join Eng-Tips and talk with other members! |
ResourcesWhat is rapid injection molding? For engineers working with tight product design timelines, rapid injection molding can be a critical tool for prototyping and testing functional models. Download Now
The world has changed considerably since the 1980s, when CAD first started displacing drafting tables. Download Now
Prototyping has always been a critical part of product development. Download Now
As the cloud is increasingly adopted for product development, questions remain as to just how cloud software tools compare to on-premise solutions. Download Now
|
RE: Electric Motor Efficiency
RE: Electric Motor Efficiency
RE: Electric Motor Efficiency
Roughly the efficiency could be suggested in average as follow:
Rating Full Load
(HP) % Efficiency
< 5 75-80
5-25 80-88
25-200 86-92
200-1000 91-93
>1000 93-95
The efficiency of modern units could be improved in few percents.
RE: Electric Motor Efficiency
RE: Electric Motor Efficiency
Per Jbartos suggestion, the average efficient for induction motors presented in the previous thread are supported by the enclosed references:
a- Paul M. Anderson, “ ANALYSIS OF FAULTED POWER SYSTEMS” .IEEE Power Engineering Series, Table 6.3
b- R. Doughty, R. Puckett and D. Brethauer “The Impact of Efficiency on the Economics of New Motor Purchase, Motor Repair and Motor Replacement”, IEEE Transactions on Industry Applications, Vol. 30, No 6, Nov/Dec 1994. (Fig 7.: Energy efficient electric motors systems, Three phase four pole –1955-1993).
The values of reference "a" are in agreement with the values of reference "b" for standard motor manufactured after 1993.
The enclosed values have been reasonably comparable with recent motor data used in power plant and industrial applications. However, any recent or accurate references are welcome.
RE: Electric Motor Efficiency
I see that above posting data on the lower side.
Other motor manufacturer catalogs could be cited.
RE: Electric Motor Efficiency
I found an other source with the following approximate samples of standard motor efficiency to share with all of you.
Speed: 900 RPM
____________________________________________________
NEMA IEEE
HP Range OLD EPACT PREMIUM 481
1-5 72.0-84.0 74.0-85.5 75.5-86.5 -
7.5-25 85.5-89.5 85.5-89.5 86.5-90.2 -
30-200 90.2-94.1 91.0-94.1 91.7-94.5 -
250-500 94.5- 95.4 -
____________________________________________________
Speed: 3600 RPM
____________________________________________________
NEMA IEEE
HP Range OLD EPACT PREMIUM 481
1-5 78.5-85.5 75.5-87.5 75.5-86.5 77.0-88.5
7.5-25 85.5-89.5 88.5-91.0 88.5-91.7 89.5-91.7
30-200 89.5-94.1 91.0-95.0 91.7-95.0 91.7-95.4
250-500 95.4 95.0-95.8 95.4 --
______________________________________
RE: Electric Motor Efficiency
RE: Electric Motor Efficiency
RE: Electric Motor Efficiency
Sorry for the late response in regard the source for motor efficiency. The sources used are all are of public domain as shown below:
Standards:
a-NEMA MG-1 (Tables 12-10,12 &13) (Hard copy)
b) EPAct : Federal Minimum Standard
http://www.usmotors.com/What%27s%20New/news003.htm
http://www.reliance.com/prodserv/motgen/b7087_5/b7087_5_8.htm#APPENDIX%201
c)IEEE: Std 841-2001for severe duty motors. (Hard copy)
References:
1- Induction Motor Efficiency Standards-J. Douglas, Univ of Washington
2- Motor efficiency - Oak Ridge National Lab ORNL-TM-13237
3- Energy Efficient Electric Motor - BPA DOE/GO 10096-290
Related sites:
http://www6.dwp.ci.la.ca.us/energyadvisor/EA_35fig.html
http://www.energy.wsu.edu/industry/files/02_029.pdf
http://www.motor.doe.gov
RE: Electric Motor Efficiency