Everything about Magnetic Circuit totally explained
A
magnetic circuit is a closed path containing a
magnetic flux. It generally contains
magnetic elements such as
permanent magnets,
ferromagnetic materials and
electromagnets, but may also contain air gaps and other materials.
Some examples of magnetic circuits are:
Magnetic circuit laws
If
is the magnetic flux in the circuit,
is the
magnetomotive force F applied to the circuit, and
is the
reluctance of the circuit, then it follows from
Ampère's law that:
»
This is analogous to
Ohm's law in electrical circuits, where the
current is equal to the
voltage (sometimes called
electromotive force) divided by the
resistance of the circuit. Here, magnetic flux, magnetomotive force and reluctance are analogous to current, voltage and resistance respectively.
If
A is the area,
μ is the
permeability of the material, and
l is the length
»
(Note that, per Stokes's theorem, the closed
line integral of H dot dl around a contour is equal to the open
surface integral of curl H dot dA across the surface bounded by the closed countour. Since, from
Maxwell's equations,
curl H = J, the closed line integral of H dot dA evaluates to the total current passing through the surface. This is equal to the excitation, NI, which also measures current passing through the surface, thereby verifying that the net current flow through a surface is zero ampere-turns in a closed system that conserves energy.)
More complex magnetic systems, where the flux isn't confined to a simple loop, must be analysed from first principles by using
Maxwell's equations.
Further Information
Get more info on 'Magnetic Circuit'.
|
External Link Exchanges
Do you know how hard it is to get a link from a large encyclopaedia? Well we're different and will prove it. To get a link from us just add the following HTML to your site on a relevant page:
<a href="http://magnetic_circuit.totallyexplained.com">Magnetic circuit Totally Explained</a>
Then simply click through this link from your web page. Our crawlers will verify your link, extract the title of your web page and instantly add a link back to it. If you like you can remove the words Totally Explained and embed the link in article text.
As long as your link remains in place, we'll keep our link to you right here. Please play fair - our crawlers are watching. Your site must be closely related to this one's topic. Any kind of spamming, dubious practises or removing the link will result in your link from us being dropped and, potentially, your whole site being banned. |
