Question

A laminated magnetic core is operating at 50 Hz with a peak flux density of 1 T. At this flux density,
the core has an iron loss of 3 W.
(a) The peak flux density is increased to 1.5 T. Estimate the new core loss.
(b) The operating frequency is increased to 400 Hz with the original peak flux density of 1T.
Estimate the new iron loss assuming that
(i) the core only has hysteresis loss and has no eddy-current loss, that is, the original 3W
of loss was only due to hysteresis. Hint : hysteresis loss is directly proportional to
frequency.
(ii) the core only has an eddy-current loss and has no hysteresis loss
(iii) the core has both eddy-current and hysteresis loss and at 50 Hz the eddy-current loss
is equal to the hysteresis loss
(c) In the situation described in part (b)iii, what is the required peak flux density at 400 Hz to
give the same iron loss as operation at 50 Hz with a peak density of 1 T. Hint: remember that
iron loss is proportional to B2

Answer 1

Question number (a), b(i), b(ii) and b(iii) have been solved with proper calculation and explanation.

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