DocumentCode :
1040100
Title :
Core losses in magnetic materials at very high flux densities when the flux is not sinusoidal
Author :
Hollitscher, Herbert
Author_Institution :
Canadian General Electric, Peterborough, Canada
Volume :
5
Issue :
3
fYear :
1969
fDate :
9/1/1969 12:00:00 AM
Firstpage :
642
Lastpage :
647
Abstract :
Presently, insufficient material data is available to predict core losses at high flux densities with complex flux waveforms. A steel tester is described whereby this data can be obtained from electrical steel at densities in excess of 20 kG. The flux wave-form can be selected and controlled to study the influence of harmonics and to simulate actual flux conditions existing in magnetic circuits. An electromechanical waveform generator is capable of synthesizing waveforms of 30 to 90 Hz fundamental with phase and amplitude selected odd harmonics up to the eleventh. This signal is amplified to excite Epstein sample strips placed in a water-cooled test yoke up to 140 kA/m. Feedback technique is applied to keep total distortion between input signal and flux waveform below 4 percent at peak excitation. The flux density is measured with air-flux compensated search coils. A calorimetric method is used to measure core losses by recording the temperature rise of thermistors placed between sample strips. Some test results are presented to demonstrate the flexibility and usefulness of the steel tester.
Keywords :
Magnetic core losses; Circuit simulation; Circuit synthesis; Circuit testing; Core loss; Distortion measurement; Magnetic circuits; Magnetic materials; Signal generators; Steel; Strips;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1969.1066505
Filename :
1066505
Link To Document :
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