Question

***current is not given in question***

Question 2B [18 Marks The magnetic circuit shown below (all dimensions in centimeters) is made from silicon steel (B-H curve attached). The magnetic flux density in the middle limb is equal to 1.2 T and the coil consists of 100 turns. a) Calculate the reluctance of each air gap.[4] b) Calculate the amount of magnetic flux in the middle limb. [1] c) Calculate the reluctance of the middle limb.[3] d) Determine the amount of flux in each airgap. [2] e) Estimate the reluctance of the left and right limbs of the core. 5.85 6.4 2 0.15 0.10 7.0 6.5 2 2 2 2 12 22 Lfi Hot-Relled Silcon Steel 15 14 13 silon Sturl 12 1.1 Soft-Cnt Steel 09 0.8 0.7 0.6 0.5 0.4 0.3 0.2 Cast Iron 0.1 500 1.800 100 200 300 400 600 700 800 900 1,000 1,100 1.200 1,300 1,400 1500 1,600 1,700 1900 2,000 Magnetic Fleld Intensity H (At/m) (a) AacT

Answer 1

Each part is done 1 by 1. e is done before d as without reluctance, flux cannot be found.

Roluctanee latt ain gapes oun OIX16 4RXI64X2X163)2 1989436 789 AT/Wb Reluctane of night au O.15X 10 2- 2984155- |83 AT/Wboo O O.48X10 wb P=BA = 1-2 X2x163)= a =O.48 mwb m- A Nau, kan B-H auave yourr at B=1.2T, H=400 AT/m dw d8 1 2 O003 400 5+6 4+0.1)X16 3x2x162 O8 338 83 AT/Wb


For left Linb, eluctane 95 Lian pat 2.1X16 +1989436 787 ain padi 2 O.003 2096936.789 AT/Wb For ght nb mla /2.85 X162 RO O93 X2x10)72984155183 de diee Aa 309 /23 8.516 AT/Wb d) deua By cunant dnaranude En Lalt Eimb = 2 RytR2 O.286 mWb For ignt Limb R RICC RTR2 X 0-194m