Topology Optimization of a Magnetic Circuit

Application ID: 43511

This model presents two examples of topology optimization of the magnetic circuit of a loudspeaker driver. A first optimization is used to find the design of a nonlinear iron pole piece and top plate that maximize the BL factor at the resting position (small displacements), while constraining the amount of iron used. A second optimization is used to find a design of the magnetic circuit with a flat BL curve, while constraining the amount of iron used. This results in a design that reduces the nonlinearities for large displacements of the speaker cone. The design generated in the second optimization is validated in a new study, showing good agreement with the topology results. Both designs are compared with a traditional design showing improved performance while requiring a reduced amount of iron.

This model example illustrates applications of this type that would nominally be built using the following products: