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HW2 Solution

# HW2 Solution - Problem 1 Simple UI Core Analyiss Dimensions...

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Problem 1 - Simple UI Core Analyiss Dimensions, etc cm 1 10 2 := mm 1.010 3 := w 1 cm := d s 2 cm := g 1.5mm := w s 5 cm := d 5 cm := N 100 := B sat 1.3 := Point where saturation occurs u 0 4 π 10 7 := Now let's compute some reluctances. For flux densities that are not saturated u 1500 u 0 := R 12 w s w + wd u := R 56 R 12 := R 23 w 2 w d u := R 81 R 23 := R 34 g wd u 0 := R 78 R 34 := R 45 d s w 2 + wd u := R 67 R 45 := R eff R 12 R 23 + R 34 + R 45 + R 56 + R 67 + R 78 + R 81 + := R eff 4.966 10 6 × =

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OK. Now, the cross sectional area we have is A wd := The flux where we saturate is Φ sat B sat A := The current to achieve this flux i sat Φ sat N R eff := i sat 32.277 10 0 × = L N 2 R eff := L 2.014 10 3 × = Inductance of UI Core with standard gap E 1 2 L i sat 2 := E 1.049 10 0 × = Energy stored in inductor Now lets change the gap to zero g 0 := R 34 g wd u 0 := R 78 R 34 := R eff R 12 R 23 + R 34 + R 45 + R 56 + R 67 + R 78 + R 81 + := R eff 190.986 10 3 × = i sat Φ sat N R eff := We know saturated with very little current i sat 1.241 10 0 × =
L N 2 R eff := L 52.36 10 3 × =

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