Eddy Current Analysis of Induction Machine by 3D Finite Element Method

The development of electromagnetic devices as machines, transformers, heating devices and other kinds of actuators confronts the engineers with several problems. For the design of a optimized geometry and prediction of the operational behavior and accurate knowledge of the dependences of the field quantities inside the magnetic circuit is necessary. The physical correlation like the Maxwell equations are well known for many years, both the analytical calculation methods forced a lot of neglect and simplification. Corrections factors were determined by practical experience to consider miscellaneous effects. Upcoming of the 70´s of the last centaury the finite element method (FEM) is today´s the state of the art for calculation of structural dynamic, thermal and, off course, electromagnetic problems. Static and transient finite element calculation of the electrical and magnetic field enable the designers to optimize well known electromagnetic devices with regard to the torque-to-mass ratio and the dynamic, thermal and acoustic behavior. Furthermore the finite element method approves the development at optimization of new devices without the necessity of extensive prototyping.