The flux must follow parallel to the edges of the

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Unformatted text preview: Magnetic Circuit with Air Gap Problem Sketch ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–375 VM169 Material Properties Br = 1.0 T Hc = 150,000 A/m Θ = -30° (X-Z plane) µr = 1 x 105 (iron) Geometric Properties Lm = .03 m Lg = .001 m hL = .03 m t = .01 m Analysis Assumptions and Modeling Notes The problem is solved using coupled-field solid elements (SOLID98). The permanent magnet is polarized along a line at Θ = -30° to the Z-axis in the X-Z plane. The coercive force components are calculated as MG169 = Hc cos Θ = 129,900, MGZZ = Hc sin Θ = -75,000. The permanent magnet relative permeability, µr, is calculated as: µr = Br 1 = = 5.30504 −7 µoHo ( 4π × 10 )(150, 000) The iron is assumed to be highly permeable and is assigned a value µr = 1 x 105. Since the device is symmetric only half of the circuit is required for modeling. At the symmetry plane the flux lines are orthogonal, so a flux-normal (Φ = 0) boundary condition is applied. With no l...
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