Conversion of Magnetic Energy to Electrical Energy

Presented by:K.SATEESH KUMAR

EEE

Learning objectives• Faraday’s Laws• Various Induced Emf’s

Directions and Magnitude• Practical applications

Michael Faraday(1821-1831)

Magnet is Moving, conductor is stationary

Faradays first Law

Statement:When a conductor is placed in a magnetic field,

due to relative motion between the conductor and magnetic field an EMF is induced.

Exp.1 Exp.2

Conductor is Moving, Magnet is stationary

Faraday’s Second law

Statement:The magnitude of induced EMF is directly

proportional to the rate of Change of Flux linkages.

Dynamically Induced EMF Statically Induced EMFSelf Induced EMFMutual Induced EMF

Magnitude and direction of Dynamically induced EMF

Right hand Thumb rule

E=BLV SIN

E= Induced EMF in voltsB= Magnetic Flux Density in webersV= velocity m/sec

= Angle between flux and conductor position

Dynamically induced EMF

• EMF produced due to space variation between the magnetic field and the conducto

AlternatorDC Generator

Applications of Dynamically induced EMF

DC Generator AC Generator

Negative sign indicates the opposition

Statically Induced EMF

• EMF produced due to the time variation of flux linking with the stationary conductor.

Self induced EMF Mutually induced EMF

Lenz’s law

• Effect oppose the cause

• Gives the direction of statically induced EMF.• Dot convention is used to identify the direction of induced

EMF.

Working of Transformer Practical Transformer

Practical approach to understand Different induced EMF

Transformer DC Generator

Save the power, Save the Natural Resources

Any quarries?