How Did WEG Achieve IE4 Efficiency with Aluminum Rotor Cages?

[Bojan]

Hello,

is there anyone who knows how WEG managed to get IE4 efficiency rating for their motors while keeping Aluminum for cage on rotor?

http://ecatalog.weg.net/tec_cat/tech_motor_sel_web.asp#

Best regards

 

[anorlunda]

That sounds like a question you should ask WEG. Or are you WEG's competitor?

 

[Bojan]

They will not answer it :P

 

[anorlunda]

Well then it sounds likely that they have a trade secret that they don't want others to know.

 

[jim hardy]

Try this tutorial

http://ecatalog.weg.net/files/wegne...motors-00010002-technical-article-english.pdf

basically, build them with more iron and bigger conductors.

and this one

https://www.industry.usa.siemens.co...ation/Documents/copper-vs-aluminum-rotors.pdf