Member Login
member
passwd
remember me on this computer.

- join now -

Search

Neat Stuff

Visit our shop for nerds in control lifestyle products.

Cool stuff
Select a topic of interest:
...and press:
Fortune
Man who falls in blast furnace is certain to feel overwrought.
RSS Feed
RSS feed Use this link to get an RSS feed of the Control.com article flow, for private, non-commercial use only:
www.control.com/rss
Select a Page Style
Select one of the following styles:
- BluFu
- Classic
(cookies required)
from the Electrical department...
3 Phase Induction Motor Rewinding
Engineering topic
advertisement
Posted by HARI on 4 May, 2008 - 7:41 pm
Hi experts,
Daily i use to update controle.com technical conversation and sharing. Its wonderful!!!!!.

In our work place we rewinded 2.6KW/7.5KW motor succesfully and tested with tachometer RPM/load current everything same (compare with new motors).

we completed 3Nos of 7.5KW and 5Nos of 2.6KW.

Now we are getting continuous fail. Is there any standard formula related 3 phase Motor rewinding or coil size specification details.

Thanks

Please reply electwar @ gmail.com

Posted by Phil Corso, PE on 4 May, 2008 - 8:49 pm
Hari, it would be fruitless to provide an answer until you furnish some some data:

1) What is failure-rate? Mean-Time-To-Failure?

2) What is the mode-of-failure, i.e., phase-to-earth; phase-to-phase; 3-phase overcurrent; within slot or in terminal box; turn-to-turn; single-phase blowout; pigtails; bearing failure; etc?

3) Are rewind materials, i.e., copper-size, insulation class, the same as original, or upgraded?

4) What about application: one-speed; two-speed; VFD?

5) How about starting method: DOL; conventional reduced-voltage methods; soft-start?

6) You mentioned amperes and speed being the same, but how about: slip; locked-rotor test parameters; uncoupled-test results?

6) Same or different rewinder(s)?

7) What method do you use to remove wire from stator?

8) Are cooling fans (if used) reinstalled?

The above should give you some ideas!

Regards, Phil Corso (cepsicon@aol.com)

From Control Engineering magazine...
Related articles from Control Engineering magazine
Above articles copyright 2008 Reed Business Information. Subject to its Terms of Use.

Your use of this site is subject to the terms and conditions set forth under Legal Notices and the Privacy Policy. Please read those terms and conditions carefully. Subject to the rights expressly reserved to others under Legal Notices, the content of this site and the compilation thereof is © 1999-2008 Control Technology Corporation. All rights reserved.

Users of this site are benefiting from open source technologies, including PHP, PostgreSQL and Apache. Be happy.

Advertisement
Our Advertisers
Help keep our servers running...
Patronize our advertisers!