《Ansys电磁分析官方培训教材_Chapter2-2》.pdf

Chapter 2 Section 2 Two Dimensional Magnetostatics Concepts for EMAG Simulation A • Boundary conditions at the edge of the model are to represent: – Flux normal – Flux parallel – Periodic design * • Even B B • Odd • Implementing the boundary conditions depend on the element formulation – Vector (2D or 3D) – Scalar (3D) – Edge based (3D) Iron A Air Coil (typical) Planar Model of a Simple Magnetizer * To be covered later in Chapter 2 ELECTROMAGNETIC ANALYSIS with ANSYS/Emag January 30, 1999 2.2-2 Release 5.5 (001172) • The magnetic vector potential (MVP) will used for the 2D magnetostatic and AC and transient applications • This formulation is referred to as the MVP since the flux density (B) is related to a vector potential (A) B = Curl(A) • For the 2D application A only has the Z component, or in ANSYS the “AZ” degree of freedom • This affects the interpretation of the boundary conditions at the edge of the model – Constraining AZ-Dirichlet condition: flux will be parallel to the edge of the model – Natural boundary condition-Neumann condition: flux will be normal to the edge of the model ELECTROMAGNETIC ANALYSIS with ANSYS/Emag January 30