Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
Magnetic Field Strength (H)
Definition, Concept, Formula, Unit
It is denoted by H and its unit is newtons per weber i.e. (N/Wb) or amperes per metre (A/m.) or ampere turns per metre (AT/m).
Magnetic
Field Strength (H)
• This gives quantitative measure of
strongness or weakness of the magnetic field. Note that pole strength and
magnetic field strength are different. This can be defined as 'The force
experienced by a unit N-pole (i.e. N pole with 1 Wb of pole strength) when
placed at any point in a magnetic field is known as magnetic field strength at
that point.
•
It is denoted by H and its unit is newtons per weber i.e. (N/Wb) or amperes per
metre (A/m.) or ampere turns per metre (AT/m). The mathematical expression for
calculating magnetic field strength is,
H
= Ampere turns/Length
ஃ H = NI/l AT/m
Key Point :
More the value of 'H', more stronger is the magnetic field. This is also called
magnetic field intensity.
Review Question
1. Define magnetic
field strength and state its units.
Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism : Tag: : Definition, Concept, Formula, Unit - Magnetic Field Strength (H)
Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
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Electrical Machines I
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