NDLI: Core losses in magnetic materials at very high flux densities when the flux is not sinusoidal

Content Provider	IEEE Xplore Digital Library
Author	Hollitscher, H.
Copyright Year	1965
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.
Sponsorship	IEEE Magnetics Society
Starting Page	642
Ending Page	647
Page Count	6
File Size	664685
File Format	PDF
ISSN	00189464
Volume Number	5
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1969-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Core loss Magnetic materials Steel Circuit testing Strips Distortion measurement Circuit simulation Magnetic circuits Signal generators Circuit synthesis
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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