What is loss coefficient tanδ?
  • Ferrite und Zubehör
  • >
  • Ferrite-Kerne

A. It is the tangent of the loss angle that represents core loss, as shown in the following formula.


  • Rm : Loss resistance of only the magnetic core
  • ω : Angular frequency
  • L : Self-inductance of the coil
  • Reff : Loss resistance of the coil including a magnetic core
  • Rw : Loss resistance of only the winding wire

Its relationship with complex magnetic permeability is as shown below.

* Terminology related to ferrites can be found in the website in ”Terms Definitions and Explanations” under ”Ferrite Summary”.
* The symbol and the catalog of this data are in accordance with IEC Publication 60401-3.
* Our terminology and settings were established by reference to JIS C 2560-1,-2.