1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Induction motor

  1. Dec 31, 2011 #1
    What will happen if the rotor speed becomes larger than the synchronous speed for induction motor?
     
  2. jcsd
  3. Jan 2, 2012 #2

    Averagesupernova

    User Avatar
    Science Advisor
    Gold Member

    Instead of the motor being an inductive load it will become a capacitive load.
     
  4. Jan 2, 2012 #3
    The sneaking suspicion is that it will become negative capacitive.

    In order to make the shaft spin faster would not energy need to be delivered into the shaft instead of extracted from it?
     
  5. Jan 2, 2012 #4

    Averagesupernova

    User Avatar
    Science Advisor
    Gold Member

    Yes energy will need to be delivered to the shaft. And the motor will resist this torque. It will expend energy to do this and will look like a capacitive load.
     
  6. Jan 2, 2012 #5
    The motor with a light mechanical load looks slightly inductive. Positive power enters the motor and leaves through the shaft minus some small losses.

    If the shaft is forced to rotate faster than the line, it's reasonable that it would look capacitive. If however power is being delivered to the shaft and subsequently delivered to the generator, then the capacitance would appear to be negative. No?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Induction motor
  1. Magnet motor (Replies: 2)

  2. Motor Driver (Replies: 2)

  3. Swl of a motor (Replies: 8)

  4. Electric motors (Replies: 9)

Loading...