×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

How to select a suitable 3 phase induction motor for a compressor

How to select a suitable 3 phase induction motor for a compressor

How to select a suitable 3 phase induction motor for a compressor

(OP)
I need to calculate the capacity 0f a 3 phase induction motor that suitable for the compressor which gives maximum efficiency. The load of the compressor is 150kW. Now I want to know how we calculate the capacity of the motor that gives maximum efficiency

RE: How to select a suitable 3 phase induction motor for a compressor

Quote:

"Do not guess, when you can calculate. Do not calculate, when you can measure." Archimedes
Compressor manufacturers publish equipment efficiencies at rated load. Since you already have the compressor, look for your compressors efficiency, divide your compressor load by the compressor efficiency to get the required motor output power. This calculated motor output should be divided by your motor efficiency to get the correct motor size for the compressor duty.
BTW, if you don't have data on your compressor and you have motors larger than the compressor, might as well couple your compressor with the motor and do a "measurement" of power input(1.732 x V x I x PF) for your compressor; as Archimedes suggests.

RE: How to select a suitable 3 phase induction motor for a compressor

Don't forget any grearing needed and it's impact on the system.

Keith Cress
kcress - http://www.flaminsystems.com

RE: How to select a suitable 3 phase induction motor for a compressor

You work with the motor suppliers to find a motor that is the most efficient at the load you are applying to the shaft. In this case, a 150kW motor that is the most efficient. Am I missing something?

Burnt2x - I'm not sure I understand why you'd divide the required motor output power by the motor efficiency. The motor rating is the output power on the shaft. The input power to the motor includes the motor efficiency.
 

RE: How to select a suitable 3 phase induction motor for a compressor

You're right Mr. Hutz. I missed and was thinking about source power requirement.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources