3d电磁场，自由度设置

铁心、空气的话就A，不用volt
载流块导体A，volt，加载单个节点总电流，耦合volt自由度
开路导体A，volt，因为也需要耦合
载流绞线圈A，加载JS
短路导体A，volt，也要耦合（D）
载压线圈A，curr，耦合节点的curr自由度
电流供电实源导体A，volt，加载单个节点总电流。。。，没有涡流
电压供电实源导体A，volt，加载电压降，没有涡流

考虑速度要volt

大体这样，具体看帮助。

1.载流块导体
Current-fed massive conductor(Classical Formulation)
Assumes a short-circuit condition with a net current flow from a current source generator. Net current is unaffected by surroundings.


电流供电实源导体
Current-fed solid source conductor  (Solenoidal Formulation)
Assumptions: Solid conductor does not model eddy current effects within the conductor and has no back emf effects.



电压供电实源导体
Voltage-fed solid source conductor  (Solenoidal Formulation)
Assumptions: Solid conductor does not model eddy current effects within the conductor and has no back emf effects.

2.Classical formulation for non-conductors or solid conductors with eddy currents

Solenoidal formulation for solid conductors with no eddy current

SOURC36 load for stranded conductors (a variation of the classical formulation)