In Electronic Infomation Category: K | on September 22,2011

** Few definitions: **

** 1. Magnetic field strength H, magnetic field strength is a characterization of the coil turns of the amount of security to reflect the source of the magnetic field strength. Magnetic induction, said magnetic field source results in a specific environment, you use a fixed force to move an object, but the actual effect is not produced on the same object, for example, by means of tools, you may also force you to make the position different or in a different direction. For you you use an established force. And the object there is a real feeling that you like the role of force field strength, and LE50A datasheet and feel like real objects magnetic induction. Unit: A / m (from the dimension we can see that the physical quantities in the current with the total death can be understood as a current alias, there is based on Amperes Theorem) **

** 2. Magnetic induction B, unit: wb/m2 or T (a permeability u rely on the interdependence of physical and LE50A price and H) **

** 3. Permeability u, B = uH. In MKS, the unit is: H / m. **

** 4. X = area of ??flux magnetic induction **

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** 5. Flux = flux turns X **

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** 6. Inductance = flux / current **

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** By the combination of the above laws of electromagnetism equations, we can draw the following equation: **

** 1. (Ampere setting is) **

** 2. (Faradays law of electromagnetic induction) **

** 3. (Poynting Theorem) **

** Another useful conclusions can be as follows: **

** 1. The same core, the inductance value is proportional to the square of the number of turns (with Poynting Theorem) **

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** In engineering from the above equation introduces the concept of inductance. **

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** 2. The same core material, the core storage capacity and LE50A suppliers and volume is proportional to The same volume, the core storage capacity with maximum flux density proportional to the square. The same volume, the same magnetic induction, the core permeability is inversely proportional to its energy storage. The same inductance value, the same core, the inductor current is proportional to the square on the size of the energy. (With Poynting Theorem) **

** (u is the absolute permeability) **

** 3. Because, while I meet the Kirchhoffs law, so similar, Hlm are met. So the flux is also satisfied, therefore, the following definitions appear: **

** MMF: **

** so defined reluctance: **

** Iron loss = hysteresis loss (determined by the hysteresis loop) + eddy current loss (from the core resistivity, size decision) + residual loss (often ignored) **

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** Actually works, the eddy current loss is often overlooked, especially in the high-frequency soft magnetic case. **

** 5. In addition, the DC bias, the permeability will decrease, resulting in decreased inductance, so the calculation of inductance, the first in the worst case to calculate the minimum inductance (maximum peak inductor current, which is the maximum DC bias, most likely saturated), then according to the AP method considered the largest inductance (no DC bias) compared to ensure the same boundary conditions **

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