By John G. Webster (Editor)
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Extra resources for 33.Magnetics
Figure 17 shows typical ﬂux distributions measured in the stator or a three-phase induction motor (11). The fundamental and third harmonic ﬂux density loci are separated for convenience and both contain large components of rotational ﬂux behind the teeth and slots. At the core back the ﬂux is mainly low in magnitude and circumferential in direction whereas in the teeth it is high in magnitude and radial in direction. The loss distribution in a motor core can be easily related to the ﬂux distribution.
BIBLIOGRAPHY 1. R. , 1979. 2. R. M. Bozorth Ferromagnetism, New York: IEEE Press. 1993 (Reissue). 3. A. Goldman Handbook of Modern Ferromagnetic Materials, Kluwer Academic Publishers. 1999. 4. A. J. A, 5): 233–245, 1990. 5. T. Nozawa M. Mizogami H. Mogi Y. Matsuo Magnetic properties and dynamic domain behaviour in grain-oriented 3% SiFe, IEEE Trans. , 32: 572–589, 1996. 6. J. W. Shilling G. L. Houze Magnetic properties and domain structures in grain-oriented 3% Si-Fe, IEEE Trans. , M10: 195–223, 1974.
The ﬂux is far more uniform in the core assembled from the amorphous material and full rotational magnetization occurring at the T-joints ensures uniform ﬂux transfer between yokes and limbs. In this particular T-joint no rotational ﬂux occurs in the grain-oriented steel core and the ﬂux remains in the rolling direction. 3. This shows that the ideal transformer core material should be isotropic with low rotational losses. Eddy Current Losses 11 Figure 15. 0 cm overlap. Saturated regions above and below butt joints are prominent (20).
33.Magnetics by John G. Webster (Editor)