1. The initial permeability is the limit value of the magnetic permeability (B/H) of the magnetic material at the beginning of the static magnetization curve. 
Where (μ) is the vacuum permeability (4π × 10-7H / m), H is the magnetic field strength (A / M), B is the magnetic flux density (T)
2, effective permeability
In the closed magnetic circuit, there is more or less air gap. If the air gap is small and negligible, the effective magnetic permeability can be used to characterize the magnetic permeability of the core.
L is the inductance (H) of the coil with the magnetic core, N is the number of turns of the coil, Le is the effective magnetic path length (m), and Ae is the effective sectional area (m2)
3. Saturated magnetic flux density
Magnetic flux density when magnetized to saturation.
4, residual flux density
The magnetic flux density remaining in the core after the excitation magnetic field is removed from saturation.
5, coercivity
After the magnetic field is removed from the saturated state, the magnetic core continues to be magnetized by the reverse excitation magnetic field until the magnetic flux density in the magnetic core is reduced to zero. The magnetic sound intensity at this time is called coercive force.
6, loss factor
The loss factor is the sum of hysteresis loss factor, eddy current loss factor and residual loss factor tan δ=tan δh+tan δe+tan δr where tan δh is the hysteresis loss factor, (tan δe) is the eddy current loss factor, and (tan δr) is the residual Loss factor
7. Specific loss factor
The specific loss factor, also known as the relative damage factor, is the ratio of the loss factor to the permeability:
Tanδ/μi (for materials), tan δ/μo (for magnetic cores with air gaps in the magnetic circuit)
8, quality factor
The quality factor is the reciprocal of the loss factor: Q=1/tanδ
9, temperature coefficient
The temperature coefficient is the relative change in the magnetic permeability for each change of 1K when the temperature changes within the range of T1 and T2:
Where μ1 is the magnetic permeability at a temperature of TI, and μ2 is the magnetic permeability at a temperature of T2
10, specific temperature coefficient
The specific temperature coefficient is also called the relative temperature coefficient, the ratio of the temperature coefficient to the magnetic permeability, ie
11, Curie temperature
At this temperature the material is converted from ferromagnetic (or ferrimagnetic) to paramagnetic. See Figure 2.
12, the drop factor
Under constant temperature conditions, the magnetic permeability of the magnetically neutralized magnetic core changes with time,
In the formula, μ1 is the magnetic permeability at t1 minute after demagnetization, and μ2 is the magnetic permeability at t2 minutes after demagnetization.
13, resistivity
The electrical resistance of a magnetic material having a unit sectional area and a unit length.
14, density
The weight of the material per unit volume, ie d=W/V
Where W is the weight of the core (kg) and V is the volume of the core (m3)
15, unit power loss Pcv or Pcm
The unit volume loss or unit weight loss of the core at high magnetic flux density. The magnetic flux density can be expressed as
Where E is the effective value (V) of the voltage applied to the coil, BM is the peak value (T) of the magnetic flux density, f is the frequency (Hz), N is the number of turns of the coil, and Ae is the effective cross-sectional area (m2)
Currently, common measurement methods for power loss include a product voltmeter method and a waveform memory method.
16, inductance factor
The inductance factor is defined as the inductance produced by each coil on a magnetic core of a certain shape and size, ie AL=L/N2
Where L is the inductance (H) of the coil with the magnetic core, and N is the number of turns of the coil
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