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Unformatted text preview: l a relay switch. An elastic keeper is modeled with a highly permeable iron and two springs. Assuming no flux leakage, determine the equilibrium displacements, δ, of the keeper and the operating point (flux density) in the permanent magnet. Figure 171.1 Permanent Magnet Circuit Problem Sketch ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–380 VM171 Material Properties For permanent magnet: Br = 1 T Hc = 150,000 A/m µr = 5.305 For iron: µr = 1 x 105 For springs: k = 3.30681 x 105 N/m For iron and permanent magnet: E = 10 x 1010 N/m2 ν=0 Geometric Properties h = .03 m w = .03 m t = .01 m a = .01 m Analysis Assumptions and Modeling Notes Since no leakage is assumed, the flux path will follow a closed loop through the iron core, permanent magnet, air gap, and keeper. The flux must follow parallel to the edges of the device, thus a flux-parallel (A = 0) boundary is set at the external nodes of the model. The inner nodes are coupled to ensure a flux-parallel boundary condition at the inner edge. The iron is assumed to be infinitely permeable and is assigne...
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