basic principles of electrical machines,faraday's laws of electro magnetic induction principle.dynamically induced Emf statically induced emf applications to electrical machines

1. Conversion of Magnetic Energy to
Electrical Energy
Presented by:
K.SATEESH KUMAR
EEE

2. Learning objectives
• Faraday’s Laws
• Various Induced Emf’s
Directions and Magnitude
• Practical applications

3. Michael Faraday
(1821-1831)

4. 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

5. 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 EMF
Self Induced EMF
Mutual Induced EMF

6. Magnitude and direction of
Dynamically induced EMF
Right hand Thumb rule
E=BLV SIN
E= Induced EMF in volts
B= Magnetic Flux Density in webers
V= velocity m/sec
= Angle between flux and conductor position

7. Dynamically induced EMF
• EMF produced due to space variation between the magnetic
field and the conducto
AlternatorDC Generator

8. Applications of Dynamically induced EMF
DC Generator AC Generator

9. 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

10. 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

11. Practical approach to understand Different induced
EMF
Transformer DC Generator

13. Save the power, Save the Natural Resources
Any quarries?