The question is whether the normal torque-producing force in an induction motor acts primarily on the iron core or the copper conductor. 

• My "Short Version" explanation of why the torque-producing force acts on the core (vs conductors) is linked here
  
• My "Long Version" explanation of why the torque-producing force acts primarily on the core (vs conductors) is link here

• Attachment by Mr X arguing that the force acts only on the conductor is here.  (I see no copyright listed. )
  
• My rebuttal to Mr. X's  post/attachment  is here  MyRebuttal *  
  
• Video of demonstration of force on core, along with discussion - click for video page

* If you download these pdf files to your hard-drive and open in Acrobat reader 7.0, you will be able to follow any written-out address links by clicking on the address.  (This includes attachments to the thread, for which I have provided green address links)

I have no doubt whatsoever about the conclusion that the normal torque-producing force in an induction motor acts primarily on the core rather than the conductors as proven by Jan and myself using indisputable laws of physics.  I will be glad to defend this conclusion in any forum or venue (for example on the motor forum at  www.eng-tips.com ).  I have the entire content of the articles that I referenced, as well as the thread from the predictive maintenance website and will be glad to provide additional details upon request. 

If any questions, please feel free to email me: contact electricpete