The hysteresis loop of a sample of sheet steel subjected to a maximum

1.	The hysteresis loop of a sample of sheet steel subjected to a maximum flux density of 1.3 Wb/m2 has an area of 93 cm2 , the scales being 1 cm = 0.1 Wb/m2 and 1 cm = 50 AT/m. Calculate the hysteresis loss in watts when 1500 cm3 of the same material is subjected to an alternating flux density of 1.3 Wb/m2 peak value of a frequency of 65 Hz.
Answer» Loss = xy (area of B/H loop) J/m³/cycle = 0.1 × 50 × 93 = 465 J/m³/cycle Volume = 1500 cm³ = 15 × 10⁻⁴ m³ ; No. of reversals/second = 65 ∴ W_h = 465 × 15 × 10⁻⁴ × 65J/s = 45.3W

The hysteresis loop of a sample of sheet steel subjected to a maximum flux density of 1.3 Wb/m2 has an area of 93 cm2 , the scales being 1 cm = 0.1 Wb/m2 and 1 cm = 50 AT/m. Calculate the hysteresis loss in watts when 1500 cm3 of the same material is subjected to an alternating flux density of 1.3 Wb/m2 peak value of a frequency of 65 Hz.

Answer»

Loss = xy (area of B/H loop) J/m³/cycle

= 0.1 × 50 × 93 = 465 J/m³/cycle

Volume = 1500 cm³ = 15 × 10⁻⁴ m³ ;

No. of reversals/second = 65

∴ W_h = 465 × 15 × 10⁻⁴ × 65J/s = 45.3W

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