Notices
Results 1 to 4 of 4

Thread: Remanent or Residual Induction?

  1. #1 Remanent or Residual Induction? 
    New Member
    Join Date
    Sep 2005
    Posts
    4
    Does anyone know the difference between residual and remanent induction (flux density) for magnetics?


    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Freshman
    Join Date
    Aug 2005
    Posts
    77
    Hi BigRob! Welcome to the board.

    Here are some definitions and links I hope you find helpful!

    Bd; Remanent induction: is any magnetic induction that remains in a magnetic material after removal an applied saturating magnetic field, Hs. Bd is the magnetic induction at any point on the demagnetization curve; measured in gauss

    Br; Residual Induction: (or flux density), is the magnetic induction corresponding to zero magnetizing force in a magnetic material after saturation in a closed circuit; measured in gauss

    http://www.magneton-usa.com/defs.htm

    http://www.mceproducts.com/knowledge-base/glossary/

    http://www.appliedengineering.com/linacs/Pmagdef.html

    Residual Induction - Br: The magnetic induction corresponding to zero magnetizing force in a magnetic material after saturation in a closed circuit, measured in gauss. Also referred to as "flux density".

    Remanence - Bd: The magnetic induction remaining in a magnetic circuit after the removal of an applied saturating magnetic field. If the circuit incorporates an air gap, the remanence will be less than the residual induction. Also referred to as "remanent induction".


    Cyndi


    Reply With Quote  
     

  4. #3  
    New Member
    Join Date
    Sep 2005
    Posts
    4
    Hmm!!!

    This doesn't quite make sense!!!

    What is confusing me is the classic way remanence is taught.

    http://hyperphysics.phy-astr.gsu.edu...s/magperm.html

    THe quote

    "The amount of magnetization it retains at zero driving field is called its remanence. "

    In your reply you gave

    "Br; Residual Induction: (or flux density), is the magnetic induction corresponding to zero magnetizing force in a magnetic material after saturation in a closed circuit; measured in gauss".

    Both are the same aren't they?

    THerefore is there a difference between remanence and remanent induction?
    Reply With Quote  
     

  5. #4  
    New Member
    Join Date
    Sep 2005
    Posts
    4
    AAAHHHHHHHHHHHHH!!!!

    I have just found

    http://www.ndt-ed.org/EducationResou...eresisLoop.htm

    Which quotes

    "Residual Magnetism or Residual Flux - the magnetic flux density that remains in a material when the magnetizing force is zero. Note that residual magnetism and retentivity are the same when the material has been magnetized to the saturation point. However, the level of residual magnetism may be lower than the retentivity value when the magnetizing force did not reach the saturation level."

    The statement that Cyndi gave in her reply states

    "Residual Induction - Br: The magnetic induction corresponding to zero magnetizing force in a magnetic material after saturation in a closed circuit, measured in gauss. Also referred to as "flux density". "

    So residual induction is only apllicable after saturation which contradicts the preceeding statement.

    So are residual magnetism and residual induction different things? (I surely think not). Retentivity? Surely that was thrown in to confuse matters still further.
    Reply With Quote  
     

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •