
AC current is applied to the coil , continuously changes the direction of current due to a magnetic field is generated around the coil . This magnetic field shows additional resistance to current flow , increases the resistance of the AC current in the coil circuits . DC circuits, the resistance to flow in the coil , the coil is produced only from the ohmic resistance of the metal .
Coils wound on the reel section , or the carcass chuck , chuck conducting a tour of the structure on the spire, called tour or winding . Coil windings are often varnished over ( insulated ) copper wire is used .
Inductance coil affect the degree of self . Henry inductance unit is . A Henry A value of 1 AC current passing through the coil 1 second change, the opposite one volt of electromotive force ( EMF ) generates a corresponding amount of the coil inductance . Henry , inductance value which corresponds to a very high value care applications, mostly henry 's used submultiple .
1 H = 1000 = 1000000 mikrohenry milihenry
Coils, capacitors and circuit element is the similarity between the two is that the electrical energy wasted reactive circuit elements . Store is electrical loads such as capacitors , coils, the magnetic field of the electric energy storage are for a short time . This is the major difference between the two circuit element , leaving the capacitors to the circuit connected to the voltage (phase difference) , kaydırmasıdır forward voltage coils . Created by the phase difference between the voltage and current coils and capacitors for applications, in different ways , and can cause damage .
Opposite coils Electromotive Force ( EMF )
AC current is applied to the coil in different directions of the magnetic fields around the coil bobbin is the effect of the above two .
The first domain, the applied AC current from zero to the maximum value of the magnetic field of the coil to increase the right to force him to put up to reduce the current study. The second effect is the maximum value of the AC current decreases to zero , this time creating tension on the coil 's magnetic field itself ( induction ) to slow down the decrease in the current study.
On the magnetic field created by the coil itself, while the latter effect is called back emf voltage . Retards the passage of current through the coils , and the AC -featured opposite emf currents are held back by 90 degrees .
Factors Affecting the inductance of the coil
Number of turns of windings , core type, wire cross-section, showing winding range , the winding number of times , the coil form , coil diameter , coil type and frequency of AC current applied to such factors as changes the value of inductance factors.
Behaviour of the coils of AC and DC Current vs.
DC current is applied to a coil current does not occur in an inductive , only a constant magnetic field is generated and this field approached to the iron , nickel , cobalt substances such as drawn by the coil . At the core is not available in coils of traction .
Unlike the DC current AC current is applied to the coil winding is formed around the barrier effect of different magnetic fields arise due to the current dolanımına . The coil inductance varies depending on the severity of resistance is called inductive reactance .
Types of coil
Air Cored Coils
Air cored coils bobinlerdir often used in high-frequency circuits . Air- cored coils inductance values used in the circuit by changing the driving position , and this change may even adversely affect the operation of the circuit . For this reason, some of the mechanical effects of this type of circuit in order to protect the air cored coils on the coil coated silicone -like substances .
Ferrite ( Ferrite ) Cored Coils
A ferrite core coils core iron , nickel , cobalt , aluminum , copper and produced by a combination of some additives . Radio-frequency ferrite core chokes are usually in the form of coil windings are wound honeycomb Spire reduce capacity between the leak . A conductive coil at the desired level with the cores of this type of production is possible . Brass and aluminum, high strength against the lines of magnetic force, showing the inductance of the cores , while reducing the inductance increases ferrite cores .
Iron Cored Coils
Another name of the iron core choke coils and audio -frequency circuits are often used for filtering .
Sheet Metal Cored Coils
This type of transformer coils, one side of the ballast , the AC motor , contactor sheets to reduce the impact of such flows were fuko places .
Moving core coils
With the movement of the moving core of the core coils and consequently the inductance of the coil's magnetic field can be changed.
Adjustable Coil Winding ( Variometer )
Adjustable coil winding bobbins can be set on a sliding coil with a nail .
Graded Coils
Gradually from the ends of the coil windings connected to a switch with multi-position to obtain different inductances .
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