Magnetic hysteresis modelling for electromagnetic field calculations
Magnetic hysteresis modelling for electromagnetic field calculations
The
modelling of magnetic materials for use in electromagnetic field calculations
is reviewed and a new physically based model suitable for any time variation of
alternating magnetic field is presented. It is based on the ideal magnetization
curve, obtained when hysteresis Is eliminated and described well by Frollch’s
equation. The other static magnetization effects are the reversible and Irreversible
magnetization changes and a domain wall area effect. Each process is simply
expressed and the seven coefficients required can be obtained from commonly
published data. Dynamic effects can be Included by allowing for eddy currents
or by using a new magnetic relaxation representation. The model is used to predict
various magnetic properties Including hysteresis loops, the normal magnetization
curve and the hysteresis loss.
Measurements
to demonstrate the model's performance were made using ring shaped laminations
with a fully controllable magnetic field. The magnetic field and magnetic flux
density were recorded digitally for subsequent computer analysis and display.
Comparison of the measurements with the computed magnetic properties shows the
model to be realistic over a wide range of circumstances.
The condition
where the magnetic field is periodic and expressed in terms of its Fourier
harmonics Is examined and useful conclusions are drawn. Use is made of the
normal magnetization, derived from the magnetic field using the curve joining
the peaks of a family of hysteresis loops. It is found that the harmonics of
the magnetization including hysteresis are related to the harmonics of the
normal magnetization by phase shifts and small corresponding changes of
magnitude. Under many circumstances the harmonic phase shifts are proportional
to their harmonic number.
University of Southampton
Renew, David Christopher
e86264b8-5c5e-4bd2-9f5d-c31cfb2d1c5a
1984
Renew, David Christopher
e86264b8-5c5e-4bd2-9f5d-c31cfb2d1c5a
Hammond, P.
0c9e5569-5994-4e57-a11c-c694bf9f7139
Steel, J.G.
c3c3a2e5-f649-4730-815b-a584bef6b117
Renew, David Christopher
(1984)
Magnetic hysteresis modelling for electromagnetic field calculations.
University of Southampton, Doctoral Thesis, 234pp.
Record type:
Thesis
(Doctoral)
Abstract
The
modelling of magnetic materials for use in electromagnetic field calculations
is reviewed and a new physically based model suitable for any time variation of
alternating magnetic field is presented. It is based on the ideal magnetization
curve, obtained when hysteresis Is eliminated and described well by Frollch’s
equation. The other static magnetization effects are the reversible and Irreversible
magnetization changes and a domain wall area effect. Each process is simply
expressed and the seven coefficients required can be obtained from commonly
published data. Dynamic effects can be Included by allowing for eddy currents
or by using a new magnetic relaxation representation. The model is used to predict
various magnetic properties Including hysteresis loops, the normal magnetization
curve and the hysteresis loss.
Measurements
to demonstrate the model's performance were made using ring shaped laminations
with a fully controllable magnetic field. The magnetic field and magnetic flux
density were recorded digitally for subsequent computer analysis and display.
Comparison of the measurements with the computed magnetic properties shows the
model to be realistic over a wide range of circumstances.
The condition
where the magnetic field is periodic and expressed in terms of its Fourier
harmonics Is examined and useful conclusions are drawn. Use is made of the
normal magnetization, derived from the magnetic field using the curve joining
the peaks of a family of hysteresis loops. It is found that the harmonics of
the magnetization including hysteresis are related to the harmonics of the
normal magnetization by phase shifts and small corresponding changes of
magnitude. Under many circumstances the harmonic phase shifts are proportional
to their harmonic number.
Text
Renew 1984 Thesis
- Version of Record
More information
Published date: 1984
Identifiers
Local EPrints ID: 460444
URI: http://eprints.soton.ac.uk/id/eprint/460444
PURE UUID: 84a90417-75e1-43c8-a6fb-566296529800
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Date deposited: 04 Jul 2022 18:22
Last modified: 16 Mar 2024 18:38
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Contributors
Author:
David Christopher Renew
Thesis advisor:
P. Hammond
Thesis advisor:
J.G. Steel
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