Engineers must understand magnetic components Specialized terms: initial magnetic permeability, effective magnetic permeability, quality factor, coercive force, inductor factor ...
1, initial magnetic permeability
The initial magnetic permeability is the magnetic thermal magnetic thermal magnetic material (B / H) at the beginning of the static magnetization curve, and the formula (μ) is a vacuum magnetoconductivity (4π × 10-7 h / m), and H is the magnetic field strength ( A / M), B is the magnetic flux density (T)
2, effective magnetic permeability
In the closed magnetic circuit, there is more or less air gaps, and if the air gap is small, it can be ignored, and the magnetic magnetic capacity of the magnetic core can be characterized by the effective magnetic permeability.
L is an inductance (H) of the coil containing the magnetic core, n is the number of coil turns, le is the effective magnetic circuit length (m), and AE is an effective cross-sectional area (M2)
3, saturated magnetic flux density
Magnetic flux density magnetized to saturation state. see picture 1
4, the remaining magnetic flux density
After removing the excitation magnetic field from a saturated state, the remaining magnetic flux density in the magnetic core. see picture 1
5, coercive force
After the magnetic field is removed from the saturation state, the magnetic core continues to be reversed in reversing magnetic field magnetization until the magnetic flux density is reduced in the magnetic core, and the magnetic sound intensity at this time is called a coercive force (see Figure 1)
6, loss factor
The loss factor is the factor, eddy current loss factor and the remaining loss factor three of the three people Tanδ = TANΔH + TAN ΔE + TANΔR
(TANΔH) is a hysteresis loss factor, (TANΔE) is a vortex loss factor, (TANΔR) is the remaining loss factor
7, compact loss factor
The comparative loss factor is also called the ratio of the loss factor and the magnetic permeability:
TANδ / μi (suitable for materials), TANδ / μo (suitable for magnetic cores containing air gaps in the day)
8, quality factor
The number of quality factors is the reciprome of the loss factor: q = 1 / tan δ
9, temperature coefficient
When the temperature coefficient changes in the range of T1 and T2, the relative variation of each change in 1K corresponding magnetic permeability:
The magnetic permeability when the temperature is Ti in the middle, and the magnetic permeability when the μ2 is T2.
10, more temperature coefficient
The ratio of relative temperature coefficients, temperature coefficients, and magnetic permeability is also called the temperature coefficient, namely
11, Curie Temperature
At this temperature, the material is converted from ferromagnetic (or ferrous magnetic) to paramagnetization. See Figure 2.
12, landing factor
Under constant temperature conditions, the magnetic fibrous magnetic core of the magnetic core varies with time,
The magnetic permeability of T1 minutes after retreat, and μ2 is a magnetic permeability of T2 minutes after retreat.
13, resistivity
The resistance of the magnetic material having unit cross-sectional area and unit length.
14, density
Unit volume material weight, ie D = W / V
The W is the weight (kg) of the magnetic core, 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
In the formula E, the voltage effective value (V) applied to the coil is a peak value (T), f) of the magnetic flux density (Hz), and n is the number of coil turns, and AE is an effective cross-sectional area (M2)
Currently, the common measurement method of power loss includes a product voltage meter method and a waveform memory method.
16, inductor factor
The inductance factor is defined as an inductance of each coil on the core having a certain shape and size, i.e., Al = L / N2
The inductance (H) of the coil containing the core, n is the number of coils, readings, original title: Engineer must magnetic component professional terminology: initial magnetic permeability, effective magnetic permeability, quality factor, Coercive force, inductive factor ...
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