Page 24 - Solutions Manual to accompany Electric Machinery Fundamentals

SOLUTION The magnetization curve for this core is shown below:

The relative permeability of this core is shown below:

Note: This is a design problem, and the answer presented here is not unique. Other
values could be selected for the flux density in part (a), and other numbers of turns
could be selected in part (c). These other answers are also correct if the proper steps
were followed, and if the choices were reasonable.

(a) From Figure 1-10c, a reasonable maximum flux density would be about 1.2 T. Notice that the
saturation effects become significant for higher flux densities.
(b) At a flux density of 1.2 T, the total flux in the core would be
  BA  (1.2 T)(0.05 m)(0.05 m)  0.0030 Wb

(c) The total reluctance of the core is:

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