The Exterior Boundaries feature is designed to efficiently compute the lumped inductance matrix with the Stationary Source Sweep with Initialization study step. For other studies such as the Stationary study, it is computationally heavier. In these cases, to improve the efficiency, switch the Exterior Field Equivalent Source to User defined or use the Magnetic Insulation boundary condition to override it. One can also use the Infinite Element feature to remove the constraint over adjacent Exterior Boundaries.
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