حل مسائل الدائرة المغناطيسية
1.A series magnetic circuit has an iron path of length 50 cm and an air-gap of length 1 mm. The cross- sectional area of the iron is 6 cm2 and the exciting coil has 400 turns. Determine the current required to produce a flux of 0.9 mWb in the circuit. The following points are taken from the magnetization characteristic:
2.
An iron-ring of mean length 30 cm is made of three pieces of cast iron, each has the same length but their respective diameters are 4, 3 and 2.5 cm. An air-gap of length 0.5 mm is cut in the 2.5 cm piece. If a coil of 1,000 turns is wound air gap. B/H characteristic of cast-iron may be drawn from the following: on the ring, find the value of the current it has to carry to produce a flux density of 0.5 Wb/m2 in the
4.The magnetic circuit of a choke is shown in Figure 9. It is designed so that the flux in the central core is 0.003Wb. The cross-section is square and a coil of 500 turns is wound on the central core. Calculate the exciting current. Neglect leakage and assume the flux to be uniformly distributed along the mean path shown dotted. Dimensions are in cm. Air gap length is 0.1 cm. The characteristics of magnetic circuit are as given below:
5.A cast steel magnetic structure made for a bar of section
2 cm × 2 cm is shown in Fig. . Determine the current that the 500 turn-magnetising coil on the left limb should carry so that a flux of 2 mWb is produced in the right limb. Take μr = 600 and neglect leakage
6.A series magnetic circuit has an iron path of length 50 cm and an air gap of length 1mm. the cross sectional area of the iron is 6 cm^2 and the exciting coil has 400 turns. determine the current required to produce a flux 0.9 mwb in the circuit. the following points are taken from the magnetisation characteristic:
flux density (wb/m^2) : 1.2 1.35 1.45 1.55
magnetizing force (At/m): 500 1000 2000 4500
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