UNIT 8: Từ thông độ thấm mạch pps

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MAGNETIC FLUX – PERMEABILITY –
MAGNETIC CIRCUIT
INDUCED ELECTROMOTIVE FORCE –
SELF AND MUTUAL INDUCTANCES

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Magnetic Field sources

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Magnetic Field sources

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Magnetic field of a bar
magnet and a solenoid

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Solenoid

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Solenoid

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Magnetic flux

A measure of quantity
of magnetism, taking
account of the strength
and the extent of a
magnetic field

Flux per unit area =
flux density
B = Ф / A
B = H x µ
µ = permeability

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Magnetization

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Magnetization curve
Field strength H
Flux density B
Residual
flux density

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Magnetic circuit

Magnetic field of a

toroid

Ф = F/ S

Ф = Flux

F = Magnetic force

S = magnetic
reluctance

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Force created by a
magnetic field on a

current carrying
conductor
F = B*I*L

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Electromagnetic
inductance
Electromotive
force
E = - ΔФ/Δt

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Mutual inductance

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Mutual inductance

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Self inductance

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Self inductance

Where:
VL = the induced voltage in volts
N = the number of turns in the coil
dø/dt = the rate of change in magnetic
flux in webers per second

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Magnetic recording /
reading

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Variations in
Hysteresis Curves