33.Magnetics by John G. Webster (Editor) PDF

By John G. Webster (Editor)

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By John G. Webster (Editor)

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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).

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33.Magnetics by John G. Webster (Editor)


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