Electromagnetism and magnetic circuits.

3. • Introduction
• Magnetic Circuit Laws
• B-H Characteristics
• Classification of Magnetic Materials
• Comparison between Electric and Magnetic Circuits
• Magnetic Hysteresis
• Hysteresis Loss
• Eddy Current and Eddy loss

5. Magnetic Field Intensity H = B/μ

6. Reluctance = (length/area) x (1/Permeability)
= l/Aμ

14. COMPARISION BETWEEN
ELECTRIC AND
MAGNETIC CIRCUIT:

15. • The number of magnetic
lines of force decides the
flux.
• There is flux φ in the
magnetic circuit which is
measured in the weber.
• MMF is the driving force
in the magnetic circuit.
The unit is ampere turns.
• Path traced by the
magnetic flux is called as
magnetic circuit.

16. • The current I = EMF/
Resistance
• R = ρ. l/a.
Directly proportional to
l.
Inversely proportional to
a.
Depends on nature of
material.
• Resistance (R) oppose
the flow of the current.
The unit is Ohm
• The Flux = MMF/
Reluctance
• S = l/ (μ0μra).
Directly proportional to
l. Inversely proportional
to μ = μ0μr.
Inversely proportional to
a
• Reluctance (S) is
opposed by magnetic
path to the flux.
The Unit is ampere
turn/weber.