Synchronous motors below 2MW rating
Synchronous motors below 2MW rating
(OP)
Client specification says Synchronous motors shall not be used below 2MW rating.
Use of Synchronous motors at higher ratings such as 10MW is because of improved efficiencies. This advantage may not be there at lower rating (such as 2MW etc.).
But, why "shall not" in the spec. Could there be some other technical reason other than efficiency (and ofcourse cost)!!
Thanks in advance.
Use of Synchronous motors at higher ratings such as 10MW is because of improved efficiencies. This advantage may not be there at lower rating (such as 2MW etc.).
But, why "shall not" in the spec. Could there be some other technical reason other than efficiency (and ofcourse cost)!!
Thanks in advance.






RE: Synchronous motors below 2MW rating
RE: Synchronous motors below 2MW rating
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: Synchronous motors below 2MW rating
IIRR, you posted a GE link on synch vs induction motors some time back. Do you still have it with you ?
RE: Synchronous motors below 2MW rating
http
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: Synchronous motors below 2MW rating
raghun - That GE piece should answer some of your questions.
RE: Synchronous motors below 2MW rating
The GE document is quite good. It has a lot that I didn't know before. One thing that I found particularly interesting is that - if the motor HP rating happens to be twice or more of the motor rated RPM, then the Synch motor is cheaper than the Cage induction one.
RE: Synchronous motors below 2MW rating
But air compressor designs changed to allow higher speed motors and for anything else, using VFDs on small low speed aplications is a much better way to accomplish that now.
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Synchronous motors below 2MW rating
It sure is when you're making or selling them!
Wonder how many VFDs made today will still be running in sixty years time?
----------------------------------
If we learn from our mistakes I'm getting a great education!
RE: Synchronous motors below 2MW rating
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Synchronous motors below 2MW rating
RE: Synchronous motors below 2MW rating
edison123—
Scroll down to the reply window, and centered below that window it an "Emoticons/Smileys" link and check box.
—busbar
RE: Synchronous motors below 2MW rating