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This paper presents an optimal approach to designing electrical machines to reduce mechanical deformation caused by magnetic nodal forces in magnetomechanical systems, while maintaining the force calculated using Coulomb's virtual work (CVW) method. It derives a design sensitivity equation by employing the adjoint variable method (AVM) to avoid undertaking numerous sensitivity evaluations for the coupled analysis. IT verifies the sensitivity analysis by using the finite-difference method (FDM). The paper examines a simple core used in a magnetic levitation system for optimal design, demonstrating the strength of the new topology optimization approach.