Electromagnetic field analysis software

EMSolution Basics 2
Main features of EMSolution

EMSolution is a general purpose three-dimensional finite element electromagnetic field solver. The main features of which are:

- Applicable to extensive electromagnetic field analysis in the quasi-static magnetic field region (frequency region that does not include electromagnetic waves, neglecting displacement currents). Three-dimensional analysis (including two-dimensional analysis) of static magnetic fields, AC steady-state magnetic fields, and transient magnetic fields including eddy currents under various magnetic field and current sources is performed.

- Primary tetrahedral, hexahedral, triangular prismatic, and secondary hexahedral edge elements are used. The use of edge primary nodal secondary tetrahedral elements improves the accuracy of eddy current analysis with tetrahedral elements. ^[2]

- EMSolution can handle linear and nonlinear magnetic material permeability. Conductor conductivity is treated as linear. Anisotropy can be considered for each.

- Two-dimensional special elements for gaps, insulation, thin plate conductors, and surface impedance ^[3] facilitate mesh generation and improve calculation efficiency.

- - COIL: A method of giving a magnetic field source using the two-potential method, giving a magnetic field and current source independent of meshes. ^[4,5.6] It facilitates mesh generation and re-duces the analysis domain. In addition, the motion of the coil can be analyzed because it can move freely in space. Various shapes of magnetic field sources can be defined, including straight lines and arcs.

- - ELMCUR: You can enter a current distribution for each element [7]. Current passing through the face of the element can be input and current in the element can be defined by the current vector poten-tial. Input is more difficult for meshes with non-aligned faces.

- - SDEFCOIL: For a conductor of rectangular cross section, the surface of the conductor is defined and the current flowing through it is given geometrically. The conservation of currents is strictly preserved, and the convergence of the ICCG method is guaranteed. ^[8]

- - PHICOIL: Applicable to any conductor cross-sectional shape, current distribution is given by DC current analysis.

- - SUFCUR: Used when energizing bulk conductors. The skin effect can be observed ^[9].

- It can handle boundary conditions where the normal or tangential component of the magnetic field is zero, as well as translational and rotational periodic boundary conditions. Boundary conditions that flip up and down when rotating can also be handled, reducing the analysis domain by half for claw-type rotating machines.

- Coupling with external circuits is possible, allowing wiring with constant-current and constant-voltage power supplies, resistors, inductors, capacitors, and nonlinear elements such as diodes.

- The following types of motion can be considered in the analysis. Motion under various external forces can be analyzed by giving forced motion and by coupling with the equations of motion.

- - Motion of COIL: The motion of the magnetic field /current source COIL is given. This can be used when an air-core coil is in motion ^[10].

- - Sliding motion: This deals with the motion expressed as a sliding motion with a plane in the air as a boundary. It can be used in rotating machines, linear motors, etc. ^[11]

- - Deformable motion: This deals with motions that change the distance between magnetic materials or conductors such as plungers. The motion is represented by the deformation of the surrounding air meshes. ^[12]

- EMSolution outputs the distribution of magnetic fields, eddy currents, heat generation, electromagnetic forces, etc. It also outputs the total heat generation, total electromagnetic force, and torque of each component. It also outputs the voltage, current and chain flux of the magnetic field/current source and external electrical elements. Coil impedance, etc. are obtained by the voltage-current relationship.