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Additional info for 33.Magnetics
It is not so common to split ro- 6 Eddy Current Losses Figure 6. 2 T) for clockwise and anticlockwise rotation (12). tational loss into hysteresis, eddy current, and anomalous loss components as is normally carried out for unidirectional ac magnetization but the total loss can be obtained from Pr = 1 T T hx 0 dbx dby + hy dt dt dt (9) where hx and hy are instantaneous tangential surface ﬁeld components in orthogonal directions. dbx /dt and dby /dt are the rates of change of corresponding ﬂux density components.
Losses at the core back are relatively low, behind the teeth and slots where rotational ﬂux occurs the losses are higher and they are highest in the teeth where the ﬂux density is highest. There is typically a factor of 2 to 3 difference between the lowest and highest losses. The actual loss is the sum of the localized losses and by far the largest volume of steel is subjected to rotational ﬂux which accounts for around 25% to 50% of the stator core of a typical induction motor or synchronous generator.
D. A. Ball H. O. Lorch An improved thermometric method of measuring local power dissipation, J. Sci. , 42: 90–93, 1965. 16. J. J. Dalton J. Liu A. J. Moses D. H. Horrocks A. Basak A virtual instrumentation based magnetic test system. Studies in Applied Electromagnetics and Mechanics, 10: 792–795, 1996. 17. A. J. Moses Classical and practical approaches to electromagnetic ﬁeld solutions in magnetic devices, Int. J. Appl. Electromagn. , 6: 1–8, 1995. 18. A. J. Moses Factors affecting localised ﬂux and iron loss distribution in laminated cores, J.
33.Magnetics by John G. Webster (Editor)