question archive A uniform circular ring consists of iron and a very small air gap of 1mm
A uniform circular ring consists of iron and a very small air gap of 1mm
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A uniform circular ring consists of iron and a very small air gap of 1mm. The mean diameter of the ring 30 cm. The cross sectional area of the ring is 6x 10-4 m2. Three coils are wound separately on the ring. Coil 1 has 400 turns and carrying a current of 2A. Coil 2 has 100 turns and carrying some current Coil 3 has 100 turns and carrying no current. This magnetic circuit has a net mmf of 900AT. Assume the relative permeability of iron to be 850.
(1) Draw the magnetic circuit diagram (1)
(2) Calculate Reluctance of the iron part of the ring. (1.5)
(3) Calculate Reluctance of the air part of the ring. (1)
(4) Calculate Total Reluctance of the ring. (0.5)
(S) Calculate Total flux of the ring. (1)
(6) Calculate Flux of the iron part. (0.5)
(7) Calculate Flux of the air gap. (0.5)
(8) Calculate current carrying in coil 2. (1.5)
(9) Calculate Magnetic field intensity in iron part. (1.5)
(10) Calculate Magnetic field intensity in air gap. (1)
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