phenomenon of mutual induction is the basis of the set of appliances.Often situation, when a person is directly confronted with its manifestations in everyday life, but do not even know about it.Let us remember the recent past, when the main means of transmission of information is an analogue signal.And now almost all electronic equipment is translated to digital modulation types.The fact that the "figure" is better known to all.But you wonder, what exactly?Surely, some houses still have a wired phone serviced by an analog PBX.If we compare the current "mobile telephones" and "oldies", the comparison is not in favor of the latter.Hearing on the background of their conversation interrupted broadcasting or even "better", the words still someone's communication - this is no surprise.This happens because in a telephone cable, the wires are close to each other, so there is mutual induction in the two lines.Another example is those pulsating clicks, appear in TV speakers or your computer's speakers, when there is mobilka and it is a call.Finally, the old IDE-cables with 80 conductors used only half of them, and another 40 have prevented the consequences that brings mutual induction.There are many examples, all the result does not make sense.The important thing to remember is that in this case, any "crosstalk" - this is the mutual induction.
Generally, this term refers to the process of occurrence of an electromotive force (EMF) in one of the adjacent conductors at the time when the other changes the actual current.Most simply explained by mutual induction with a transformer.In its simplest form (a special case), the transformer comprises two coils wound on the same magnetic core.When current flows through the wire of one of them around a magnetic field.As a result, the magnetic flux penetrates appeared conductor of the second coil, creating in her EMF.Induced current to appear, it is enough to close the findings of the coil, creating a chain.With the increasing intensity of the magnetic flux increases and the mutual.To achieve the desired performance (e.g., efficiency) are using different solutions: changing the configuration of the magnetic circuit;perform a special way of winding the coils and so on. The mutual inductance is measured using variometers.
How it manifests itself in the examples mentioned earlier in this article?Very simple: in almost all cases (except for mobile telephones) are located next to several conductors, at least one of which passes an electric current.Consequently, there is a magnetic field that generates magnetic flux.Last, penetrating nearby conductors, which leads to the EMF, as well as a chain is, in accordance with the law of electromagnetic induction, there is a current.His direction is determined by applying the rule of Lenz.
the mutual has been widely used in modern electronics.Since some of its undesirable effects were listed earlier in this article, it makes sense to give examples of useful.One of the most well-known devices - household stabilizer mains.Inside there is a transformer (usually a toroid type) with a plurality of pins, each of which corresponds to a certain voltage value.Also, in some instruments can be found an interesting solution - galvanic isolation.In fact, this is the same transformer (sometimes Photo coupler), but do not use the transformation ratio.As a result, unable to perform the magnetic flux through the connection of several circuits, providing the required level of electrical safety.In manufacturing, for example, that overhead crane.
