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Inductors
 

Inductors

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    Inductors Inductors Presentation Transcript

    • INDUCTORS
    •  Stores energy in the form of magnetic field and delivers it as and when required. Whenever current passes through a conductor, lines of magnetic flux are generated around it. This magnetic flux opposes any change in current due to the induced e.m.f. This opposition to the current is known as inductance and the component producing inductance is known as inductor.
    • Unit  Henry (H).Induced e.m.f (electromotive force):L= inductance in Henrydi/dt = rate of change of current.
    • FACTORS THAT AFFECT INDUCTANCE OF A COIL. Number of turns in the coil Permeability of the core material. Size of core.Inductance is given by,
    •  Permeability is the measure of the ability of a material to support the formation of a magnetic field within itself.
    •  An inductor consist of  copper wire wound around a core made up of a ferromagnetic material.
    • FERRO MAGNETIC MATERIAL
    • TYPES Fixed inductors  Air core inductors  Iron core inductors  Ferrite core inductors Variable inductors.
    • FIXED INDUCTORSAIR CORE INDUCTORS Former made up of ceramic plastic or cardboard.
    •  Air will be there inside former. It has the least inductance, since in air all magnetic lines produced by changing current do not link with every turn of coil, many of them lost in space.
    • HIGH FREQUENCY AIR CORE INDUCTORS
    • IRON – CORE INDUCTOR. Copper wire  wound on hallow former Core material passes through the former  it forms closed magnetic path for the magnetic flux. So, it donot leak outside of coil. Flux line  iron + total flux Former  paper or plastic Core  silicon steel or ferromagnetic material in the form of sheets. Laminated Sheets  to reduce hysteresis and eddy current losses.
    •  Iron – core inductors  called choke Useful at low frequencies. Value  few henries. Applications:  Filter circuit in power supplies.  Chokes in fluorescent tubes
    •  Eddy current  electric currents induced in conductors when exposed to a changing magnetic field. Disadvantages: enormous increase in hysteresis and eddy current loss Cannot be used for high frequencies.
    • FERRITE CORE INDUCTORS ForHigh frequency applications. Core  ferrite  an insulator having high permeability. Ferrite  hard, dense ceramics made of ferric oxide +metal oxides
    •  Ferrite core  solid and not in laminated sheets Because of their high resistivity. Value  few μH to few mH.
    • APPLICATIONS R.f chokes for supply decoupling purposes. Switching regulated type d.c power supplies Various types of filters in communication equipment.
    • VARIABLE INDUCTORS