Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Load angle at no load

  1. Jul 2, 2017 #1
    hi all,

    Just a quick question, what would the load angle be of a synchronous motor when running at no load. would it be 0 degrees or 45 degrees
  2. jcsd
  3. Jul 2, 2017 #2


    User Avatar
    Gold Member

    What do you think and why?
  4. Jul 2, 2017 #3
    to be honest im really not sure, I suspect it is zero as there is no load so the magnetic field of the rotor is the same as the stator. am I on the right tracks
  5. Jul 2, 2017 #4


    User Avatar
    Gold Member

    I agree w/ you, although I'm not sure I'd call it a "load angle" since there's no load :smile:
  6. Jul 2, 2017 #5


    User Avatar
    Homework Helper
    Gold Member

    Yes. Active power is proportional to the sine of the load angle. No load, no active power, hence zero load angle.
    No. You can say rotor magnetic field and stator magnetic field are aligned, or in other words, rotor is aligned with the resultant magnetic field.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted