Synchronous vs Induction Motors
Synchronous vs Induction Motors
(OP)
I am looking for info on selection of induction versus synchronous motors in a medium voltage, over 1000 HP, adjustable speed drive pumping application.
Any help would be appreciated!
Any help would be appreciated!





RE: Synchronous vs Induction Motors
RE: Synchronous vs Induction Motors
The second issue is made moot by using a VFD. You will be able to run at reduced speed while saving power (assuming it is a centrifugal pump) using a standard "off-the-shelf" squirrel cage induction motor.
If on the other hand, your entire facility has a poor power factor, the synchronous motor can be run at a leading power factor and correct for the other loads in the facility. In this case your motor will be acting as a synchronous condensor. Candidates for this use are mtors that run continuously for long periods while the other poor power factor loads are also running. If this pump will cycle on and off, it is probably not a good synch. condensor candidate. Don't worry about the PF of this particular motor, if you use a VFD it will maintain a .95 PF to the line without needing to use a synchronous motor.
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RE: Synchronous vs Induction Motors
http://www.ge.com
and search for AC Motor Drives
for more info
RE: Synchronous vs Induction Motors
Usually, LCI are used to control speed synchronous motors, e.g.
http://www.geindustrial.com/products/brochures/GET-8021B.pdf
http://www.hpcnet.com/course_info/e/e505.html
http://www.minasco.com.au/MisimaTreatmentPlant.html
http://eic.changwon.ac.kr/bk21/asp/mecha/data/acdrivey2k.pdf
http://www.teco-wmc.com/Controls/fm2000/
(Universal AC Drive)
etc. for more info.
1000HP motor with associated drive is relatively small for synchronous motor and LCI drive. The squirrel cage induction motor and VSI or CSI drive topology can be considered. There are a few manufacturers who offer this technology.
RE: Synchronous vs Induction Motors
AB
ABB
GE
Robicon
Toshiba
All on www.drivesmag.com