A-formulation (Electrical Machine)

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A tmp10265_thumbformulation

It is sometimes interesting to use a hybrid Atmp10266_thumbformulation. Thetmp10267_thumb formulation is used in regions without current whereas an A-formulation is used in regions with an applied current density. At the interface surfaces between regions with a different potential formulation, the conditions for H and B are applied:

tmp10270_thumb

The advantage of this approach compared to the 9 -formulation, is that no sourcc field T has to be constructed. The advantage of this approach compared to the A-formulation, is that regions without current are described by a scalar potential instead of a vector potential. A disadvantage of the hybrid formulation is the extra interface condition.