Saturation magnetic induction intensity Bs: Its size depends on the composition of the material, and its corresponding physical state is that the magnetization vectors inside the material are neatly arranged.
Residual magnetic induction intensity Br: is the characteristic parameter on the hysteresis loop, the B value when H returns to 0.
Squareness ratio: Br∕Bs
Coercive force Hc: It is a quantity indicating the difficulty of magnetization of a material, and depends on the composition and defects (impurities, stress, etc.) of the material.
Magnetic permeability μ: is the ratio of B to H corresponding to any point on the hysteresis loop, and is closely related to the working state of the device.
Initial permeability μi, maximum permeability μm, differential permeability μd, amplitude permeability μa, effective permeability μe, and pulse permeability μp.
Curie temperature Tc: The magnetization of ferromagnetic substances decreases as the temperature increases. When a certain temperature is reached, the spontaneous magnetization disappears and becomes paramagnetic. The critical temperature is the Curie temperature. It determines the upper limit temperature at which magnetic devices work.
Loss P: hysteresis loss Ph and eddy current loss Pe P = Ph plus Pe = af plus bf2 plus c Pe ∝ f2 t2 / , ρ decreases,
The method to reduce the hysteresis loss Ph is to reduce the coercive force Hc; the method to reduce the eddy current loss Pe is to reduce the thickness t of the magnetic material and increase the resistivity ρ of the material. The loss of the core in free still air is related to the temperature rise of the core as:
Total Power Dissipation (mW) / Surface Area (cm2)
