Free Trial

Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.


  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

8 Polyphase Induction Motors > 8.44 POWER FACTOR COMPENSATION

8.44 POWER FACTOR COMPENSATION

The phase of the injected emf can be in phase or in phase opposition with the secondary voltage when yoke is in such a way that the centre of the winding belt a1a2 coincides with the centre of the corresponding phase belt of the secondary. There should be an existence of the similar condition for the phase belts blb2 and c1c2. This causes the resultant voltage in the secondary to be in phase with the secondary no- load voltage. The power factor of the secondary is solely governed by the resistance and the reactance of the secondary.

If there is non-symmetrical placement of the brushes (A1A2) with respect to the centre line of the corresponding phase belt, the injected voltage will not be either in phase or out of phase with the secondary voltage and will differ from it also. The phase of the secondary current is also shifted. Therefore, it can be concluded that the improvement of the power factor can be effected by suitable adjustment of the yoke of the brushes.


  

You are currently reading a PREVIEW of this book.

                                                                                                                    

Get instant access to over $1 million worth of books and videos.

  

Start a Free Trial


  
  • Safari Books Online
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint