+ Post New Thread
Results 1 to 4 of 4
  1. #1
    Newbie level 5
    Points: 167, Level: 2

    Join Date
    Jun 2018
    Posts
    9
    Helped
    0 / 0
    Points
    167
    Level
    2

    Core losses in the inductor

    Hello everyone

    We use steinmetz equation to find the corelosses. I have four coils from different suppliers and I want to know core losses in each coil. Problem is that there is no information in the data sheet about the core materials and no flux density, frequency and power graphs are given as the suppliers do not want to share this information and keeps this as secret secret. Without this information I cannot use steinmetz equation. The dimensions of the inductor, inductor and temperature rise vs current graphs are given.

    How can I find the corelosses in this situation, Is there any other alternative way?

    Regards
    Ghufran

    •   AltAdvertisment

        
       

  2. #2
    Super Moderator
    Points: 250,728, Level: 100
    Awards:
    1st Helpful Member

    Join Date
    Jan 2008
    Location
    Bochum, Germany
    Posts
    43,653
    Helped
    13276 / 13276
    Points
    250,728
    Level
    100

    Re: Core losses in the inductor

    Generally, you need to measure the losses versus frequency and flux empirically. That's also what manufacturers do. Steinmetzt equation isn't but a simplified estimation of actual behavior.



    •   AltAdvertisment

        
       

  3. #3
    Advanced Member level 5
    Points: 30,908, Level: 42
    Achievements:
    7 years registered

    Join Date
    Sep 2008
    Location
    cambridge
    Posts
    6,453
    Helped
    472 / 472
    Points
    30,908
    Level
    42

    Re: Core losses in the inductor

    I presume you mean ferrite inductors....some maunfacturers like vishay, coilcraft, Wuerth, give software to allow you to calculate core loss in whichever inductor.
    But otherwise, you just have to make do with thermal measurements with thermocouples glued to the ferrite.



    •   AltAdvertisment

        
       

  4. #4
    Advanced Member level 5
    Points: 38,026, Level: 47

    Join Date
    Mar 2008
    Location
    USA
    Posts
    6,143
    Helped
    1784 / 1784
    Points
    38,026
    Level
    47

    Re: Core losses in the inductor

    Quote Originally Posted by treez View Post
    I presume you mean ferrite inductors....some maunfacturers like vishay, coilcraft, Wuerth, give software to allow you to calculate core loss in whichever inductor.
    But otherwise, you just have to make do with thermal measurements with thermocouples glued to the ferrite.
    That will give you temp rise, but then you'd also need
    to measure the heat-throw vs temp somehow. Maybe
    just baseline a DC power vs temp-rise cal-curve? What's
    the done thing, there?



--[[ ]]--