μi |
A.C. Initial Permeability μi is defined as the limited value of a ferrite core at the origin of the curve of initial magnetization: μ0 : Permeability of vacuum B: A.C.magnetic flux density H: A.C.magnetic field strength |

μa | Amplitude Permeability similar with i, but magnetized by a large amplitude sine field. |

Tanδ/μi | Relative Loss Factor loss at low induction level. |

PV | Power loss loss at high flux density level. |

Bms | Effective Saturation Magnetic Flux Density (mT) |

Brms | Residual Magnetic Flux Density (mT) |

Hc | Coercive Force (Oersteds) (A/m) |

αF |
Temperature Factor of Permeability μ1 : Permeability of T1 μ2 : Permeability of T2 |

ηB |
Hysteresis Material Constant ΔRh: hyseresis loss resistance ω: angular frequency L : inductace of coil with the core μe : effectve permeability ΔB: amplitude magnetc flux of density |

D_{F} |
Disaccommodation Factor μi1 : permeability measured at time t1 after demagnetization μi2 : permeability measured at time t2 after demagnetization |

Tc |
Curie Temperature temperature at which a ferrite loses is ferromagnetism Specific Resistivity (m) |

d |
Apparent density, The Apparent density is defined as a weigh per unit volume where W: weight of the magnetic core(g) V: volume of the magnetic core(cm3) |

AL(nH) |
Inductance Factor Inductance of a coil on a specified core divided by the square of the number of turns.(Unless otherwise specified the inductance test conditions for the inductance factor are at flux density<10 gauss). Inductance Effective Core Parameters The summation of the magnetic path lengths of each section of a magnetic circuit divided by the corresponding magnetic area of the same section. The summation of the magnetic path lengths of each section of a magnetic circuit divided by the square of the corresponding magnetic area of the same section. Le=C1²/C2(cm) Effective magnetic path length Ae=C1/C2(cm²) Effective cross-sectional area Ve=C1³/C2²(cm³) Effective core volume C1 (mm ^{-1}) Core constant Aw (mm²) Winding area of core Ac (mm²) cross-sectional centre leg area W (g) Approx.weigh of core |

2011-09-30 18:13:43