This document provides an introduction to magnetic circuits, including key definitions: - Magnet provides magnetic property, magnetic flux is the number of field lines passing through a closed surface. - Magnetic flux density B and field intensity H are defined, with units of tesla and ampere/meter respectively. - Magneto motive force (MMF) is the force that causes flux to flow, measured in ampere-turns. Reluctance is the opposition to flux flow, measured in ampere-turns/weber. - Permeance is the reciprocal of reluctance. Permeability is the ability of a material to allow flux flow. - Series and parallel magnetic circuits are discussed, behaving similarly to electric

1. Magnetic Circuit
Mr. C D Patil
Dept. of EE

2. Introduction
• Magnet- It is the piece
of solid substance which
has magnetic property.
• Magnetic Flux- (φ) It is
defined as the number
of magnetic field lines
passing through a given
closed surface.

3. Introduction
• The magnetic flux density is
the number of lines of force
passing through a unit area of
material, B. The unit
of magnetic induction is the
tesla (T).
• Magnetic field intensity (H) at
any point in the magnetic
field is defined as the force
experienced by the unit north
pole at that point. In simple
terms, it is a measure of how
strong or weak any magnetic
field is. The SI unit
of magnetic field intensity is
Ampere/meter (A/m)

4. Basic Definitions
• Magneto Motive Force- (MMF)- It is the force
due to which causes magnetic flux to flow.
• Its unit is Ampere- Turns (N-I)
• Where, N= No. of turns in magnetizing coil
I= Current in Amp.
• Reluctance (S)- It is the opposition to the flow
of flux
• Its unit is Ampere- Turn/ Weber (AT/Weber)

5. Basic Definitions
• Permeance – It is the reciprocal of Reluctance.
• Its unit is weber/ Ampere- Turns
• Permeability- It is the ability of material to
allows the flow of flux.

6. Series Magnetic Circuit
• The Series Magnetic
Circuit is defined as the
magnetic circuit having
a number of parts of
different dimensions
and materials carrying
the same magnetic
field.

7. Parallel Magnetic Circuit
• A magnetic circuit having two or more
than two paths for the magnetic flux is
called a parallel magnetic circuit.
• Its behavior can be compared to the
parallel electric circuit.
• The parallel magnetic circuit contains
different dimensional areas and
materials having various numbers of
paths.

8. Parallel Magnetic Circuit

9. Electric & Magnetic Circuits

10. Magnetization Curve (B-H Curve)

11. Thank You!!!