Abstract
Magnetic crane is one of the industrial applications of magnetic absorption, which uses an electromagnet to create the necessary force for lifting and moving objects. In this paper, the field analysis and design of an electromagnet are discussed. During the electromagnet analysis and design process, with special attention to leakage fluxes and fringing effects, a new magnetic equivalent circuit for an electromagnet is proposed. Also, the nonlinear behavior of the B-H curve of the ferromagnetic core and its saturation point are considered. Due to the various shapes of the ferromagnetic core, the U_I structure is selected with a symmetrical winding to reduce leakage flux and fringing effects. MATLAB software is used for analyzing and designing the electromagnet, and ANSYS Maxwell software is used to simulate its magnetic field. To verify the accuracy of the proposed method, the prototype was made of a magnetic crane with designed electromagnet. The comparison between measurement and simulation results shows that the error is less than 2%, which confirms the accuracy of the proposed method.
Highlights
Electromagnet is one of the main component which is used in equipment such as motors, generators, MRI devices, magnetic suspension systems in the Maglev trains, and in magnetic cranes for lifting and moving objects
Simple magnetic equivalent circuits are introduced for electromagnet
In [2], several permeances are added to the simple magnetic equivalent circuit to take into account the leakage fluxes and fringing effects
Summary
Electromagnet is one of the main component which is used in equipment such as motors, generators, MRI devices, magnetic suspension systems in the Maglev trains, and in magnetic cranes for lifting and moving objects.In the textbooks, simple magnetic equivalent circuits are introduced for electromagnet. The magnetic flux inside the core can be calculated [1]. In this analysis method, usually the leakage flux, fringing effects, nonlinearity relation between B and H of the core and its saturation point are not considered. In [2], several permeances are added to the simple magnetic equivalent circuit to take into account the leakage fluxes and fringing effects. It does not have field analysis, and the location of some of the permeances are not sufficiently precise
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