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Question 20.3: Energy Product for Permanent Magnets Determine the power, or......

Energy Product for Permanent Magnets
Determine the power, or BH product, for the magnetic material with the properties shown in Figure 20-11.

20-11
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Several rectangles have been drawn in the fourth quadrant of the B-H curve. The BH product in each is
BH_{1} = (12,000)(280) = 3.4 × 10^6 gauss ⋅ oersted
BH_{2} = (11,000)(360) = 4.0 × 10^6 gauss ⋅ oersted
BH_{3} = (10,000)(420) = 4.2 × 10^6 gauss ⋅ oersted = maximum
BH_{4} = (9,000)(460) = 4.1 × 10^6 gauss ⋅ oersted
BH_{5} = (8,000)(500) = 4.0 × 10^6 gauss ⋅ oersted
Thus, the power is about 4.2 × 10^6 gauss ⋅ oersted.

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