1, the initial magnetic permeability of the material is the permeability (B / H) in the beginning of the magnetization curve of the static limit, the formula ([mu]) is the vacuum permeability (4π × 10-7H / m), H is the magnetic field intensity (A / M), B is the magnetic flux density (T)
2, the effective permeability
In the closed magnetic circuit, there is a gap more or less, if the gap is negligibly small, the effective permeability can be used to characterize the ability of magnetically permeable core.
Inductance (H) L is the core with the coil, N is the number of turns, Le is the effective magnetic path length (m), Ae is the effective cross-sectional area (m2)
3, the saturation magnetic flux density
Magnetic flux density to saturation.
4, the residual magnetic flux density
After removal of the excitation field, the residual magnetic flux density in the core from a saturated state.
5, the coercive force
From the saturation magnetic field is removed, the core continues to be magnetized backward pumping, until the core flux density reduced to zero, acoustic intensity at this time is called magnetic coercive force
6, the loss factor
Loss factor is a factor of hysteresis loss, eddy current loss factor and the remaining three of the loss factor and tanδ = tanδh + tanδe + tanδr formula (tanδh) as the hysteresis loss factor, (tanδe) for the eddy current loss factor, (tanδr) remaining loss factor
7, the loss factor than
Also known as the relative loss factor than the factor is a damage ratio of loss factor to permeability:
tanδ / μi (suitable material), tanδ / μo (days applicable cores with gaps in the magnetic circuit)
8, quality factor
Reciprocal of the quality factor and the loss factor: Q = 1 / tanδ
9, the temperature coefficient
The temperature coefficient of the temperature changes within the range of T1 and T2, each corresponding to a change amount of relative change 1K permeability:
Where μ1 is the magnetic permeability when the temperature of TI, μ2 permeability at temperature T2 at
10, than the temperature coefficient
Also known as the temperature coefficient than the ratio of a relative temperature coefficient, and the temperature coefficient of permeability, i.e.,
11, Curie temperature
Paramagnetic material into a ferromagnetic (or ferrimagnetic) at this temperature. See Figure 2.
12, Save off factor
At a constant temperature, permeability of the core after the magnetic neutral change in attenuation over time,
Where μ1 is the permeability of t1 minutes after demagnetization, μ2 magnetic permeability t2 min demagnetization
13, the resistivity
Magnetic material having a resistance per unit sectional area and unit length.
14, density
Weight per unit volume of the material, i.e., d = W / V
Wherein W is the weight of the magnetic core (kg), V is the volume of the core (m3)
15, the unit or power loss Pcv Pcm
The core per unit volume at high magnetic flux density per unit weight loss or loss. The magnetic flux density can be expressed as
Where E is an applied voltage RMS (V) to the coil, BM are the peak (T) magnetic flux density, f is the frequency (Hz), N the number of turns, Ae is the effective cross-sectional area (m2)
At present, the commonly used method of measuring the power loss and voltage meter comprises a product of the waveform memory method.
16, inductance factor
Factor is defined as the amount of inductance inductor core having a certain shape and size of each turn of the coil, i.e., AL = L / N2
Inductance L of the coil core with the formula of (H), N the number of turns, Read, original title: engineer will understand magnetic element Glossary: initial permeability, effective permeability, quality factor, coercive force, inductance factor ......
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