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Topic 1 : Magnetic Concept and Transformer. Magnetism Magnetic Circuit Transformer Construction Transformer equivalent circuit Transformer test, efficiency and regulation. MAGNETISM. Magnetic field. A magnet has two poles – N and S

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topic 1 magnetic concept and transformer
Topic 1 : Magnetic Concept and Transformer
  • Magnetism
  • Magnetic Circuit
  • Transformer Construction
  • Transformer equivalent circuit
  • Transformer test, efficiency and regulation.
magnetic field
Magnetic field
  • A magnet has two poles – N and S
  • Shape of steel fillings on a sheet over a magnet are shown below.
magnetic field1
Magnetic field
  • The shape and density of the chains formed enable us to form a mental picture of a magnetic field and lead to the idea of magnetic flux lines.
  • The density of the lines depends on the strength of the magnet.
  • The area in which the steel filling are affected by the magnet is become thinner further away from the magnet.
characteristic of magnetic flux
Characteristic of magnetic flux
  • The direction of flux is from North to South.
  • Each line of magnetic flux forms a closed loop.
  • Lines of electric flux never intersect.
  • Lines of magnetic flux are like stretched elastic cords, always trying to shorten themselves.
  • Lines of magnetic flux which are parallel and in the same direction repel one another.
magnetic field of a current carrying conductor
Magnetic field of a current carrying conductor
  • Current going in (left)
  • Current coming out (right).
  • Solenoid.
force on current carrying conductor

S

S

Force

N

N

Force on current carrying conductor
  • Flux of magnet and conductor
  • Interaction of flux produces force
force on current carrying conductor1

Index finger

FLUX

Force on current carrying conductor

Thumb

FORCE

Middle finger

CURRENT

  • Left-hand rule
electromagnetic induction
Electromagnetic induction
  • Two experiments performed by Michael Faraday.
  • Electric current could be produced by the movement of magnetic flux relative to the coil.
electromagnetic induction1

Index finger

FLUKS

Electromagnetic induction

Thumb

FORCE

Middle finger

CURRENT

  • Direction of induced emf.
    • Fleming’s right-hand rule.
    • Lenz’s law - The direction of an induced emf is always such that it tends to set up a current opposing the motion or the change of flux responsible for inducing that emf.
basic definitions4
Basic Definitions
  • Permeability of different materials
  • Notice the nonlinearity
comparison of electric and magnetic circuit1
Comparison of electric and magnetic circuit
  • Since the magnetic circuit behaves in similar ways as an electric circuit, the laws of electric circuit are applicable to the magnetic circuit.
  • Ohm’s law equivalent :
    • F = ΦS.
  • Kirchoff law equivalent:
    • Φin = Φout
    • Total NI = Total Hl
  • A magnetic circuit can be redrawn as electric circuit equivalent to facilitate the analysis.