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Subproblem finite element method for magnetic model refinements

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Fig. 2. Field lines and magnetic flux density for a linear model (b 1 , µ r,1 =1000, top left) and its non-linear cor- cor-rection (b 2 , top right); another non-linear correction (b 2 , from µ r,1 =780, bottom right); final relative permea-bility ( µ
Fig. 3. An electromagnet: field lines in an ideal flux tube (b 1 , µ r,core = 100), for the inductor alone (b 2 ), for the leakage flux (b 3 ) and for the total field (b=b 1 +b 2 +b 3 ) (left to right)
Fig. 7. Inductor flux linkage versus the core magnetic permeability (air gap thickness of 3 mm) updated after each model refinement (left); flux linkage relative correction from 1-D to 2-D models (middle) and from 2-D to 3-D models (right) versus the cor
Fig. 8. Core-inductor system: magnetic flux lines for the perfectly conducting core (non-magnetic) (b 1 ; left), the finite conductivity correction (aluminium core) (b 2 ; middle) and the complete solution (b=b 1 +b 2 ; right)
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