Résumé

This paper presents the design and optimization of an iron-less spherical actuator capable of operating in an MRI (magnetic resonance imaging) environment. A coupled electromagnetic-thermal approach is adopted for the actuator design. To reduce optimization time, a electromagnetic model is developed to predict the magnetic field generated by the actuator, while a 1D lumped parameter thermal model (LPTM) is employed to estimate the actuator's heating. These models are validated using finite element analyses. MRI compatibility is ensured through the definition of both electromagnetic and thermal criteria.