The use of the finite-element method (FEM) is a popular process of designing loudspeakers. Creating a high-quality loudspeaker is a complex task that involves taking into account a multitude of factors. Using a trial-and-error approach is not practical due to the associated time and cost implications. The magnetic circuit (MC) is one of the most expensive and bulky components of the loudspeaker, making its optimization essential for reducing costs and improving mechanical performance. This study proposes a methodology for optimizing the shape and weight of polar plates of magnetic circuit using polar plates by analyzing three different-sized woofers (3, 10, and 15 inches). The objective functions focus on three areas: force factor BL(x=0) value, BL curve symmetry, and reduced volume/mass of the plates. The results showed improved performance in terms of BL(x=0) and BL curve symmetry, as well as a significant reduction in size. The proposed models should be viewed as the starting point for optimizing the magnetic circuit, with a focus on the polar plates. However, there is room for improvement as several design variables were not considered (e.g., magnet size and air gap), and the results should be validated in a subsequent prototyping phase before being implemented in a subsequent design phase.
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