Partial Segment Force on Ferromagnetic Material of High-Field Magnetic System

The electromagnetic total force and body force density distribution in the high-field magnetic system are important factors for mechanical deformation or vibration, electromechanical-coupled phenomenon, behavior of ferromagnetic material, etc. Since the high-field magnetic system, such as the transformer, electric motor, and generator with magnetic core are driven by very high magnetic flux density, the resulting electromagnetic force is so large that it causes serious mechanical problems. Therefore, accurate analysis of the distribution of force density and the partial forces on segment parts is helpful for the mechanically solid design of machine structures of ferromagnetic part and superconducting windings. In this paper, the body force density distribution and the partial forces over the ferromagnetic core are presented by using the recently developed body force calculation methods, which are based on the virtual airgap scheme. The presented method is applied and tested for four examples of a transform, a dipole magnet, a quadrupole magnet, and an induction motor.