NDLI: Estimation of Suppressed Iron Loss by Stress-Relief Annealing in an Actual Induction Motor Stator Core by Using the Excitation Inner Core Method

Content Provider	IEEE Xplore Digital Library
Author	Oka, M. Ogasawara, T. Kawano, N. Enokizono, M.
Copyright Year	1965
Abstract	It is well known that magnetic properties, such as iron loss of a stator core in a rotating machine like an induction motor, are strongly influenced by residual stress caused by manufacturing processes. In particular, both the residual stress that was generated by the punching and the laminating process greatly influence the iron loss. However, it is not easy to evaluate the magnetic properties of a complex shape like the actual stator core. We are proposing the excitation inner core method to evaluate the change in the magnetic properties of the actual stator core. This method can easily evaluate changes in magnetic properties in an actual stator core. We applied this method to a comparison of the magnetic properties before and after annealing the stator core, which was annealed by the low-frequency induction heating method. In this annealing, the center section of a tooth in the stator core was heated for eight minutes at temperatures up to about 800°, and afterward the stator core was slowly cooled to room temperature. Iron loss of the stator core before annealing decreased by 4.9% (B_ex =1.5 T) after annealing.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	4
Page Count	4
File Size	1645143
File Format	PDF
ISSN	00189464
Volume Number	50
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Stator cores Annealing Magnetic cores Iron Magnetic properties Coils Magnetomechanical effects stress-relief annealing Excitation inner core iron loss residual stress rotating machine stator core
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Estimation of Suppressed Iron Loss by Stress-Relief Annealing in an Actual Induction Motor Stator Core by Using the Excitation Inner Core Method

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