Solid, Stranded, and Parallel Current Sources
These types of sources specify the magnitude and phase of the AC current flowing through a conductor. Solid current sources model eddy and displacement currents in a solid conductor. The amount of eddy current and displacement current — as well as the amount of source current — are included in the total current you specify.
这三种是maxwell中常见的三种电流源，可以通过定义幅值和相位来确定其中流过的交流电。
实体电流源-用来模拟具有涡流和位移电流的实心导体。Total current（总电流）中包含了涡流、位移电流（或则叫源电流）。
Stranded current sources model current as being carried on strands within a conductor. They can be used to model conductors made up of many individual insulated turns, all small enough so that eddy currents can be neglected. Eddy currents and displacement currents are not computed inside the conductor. Either the total current or the current density may be specified. A uniform current density is assumed throughout the conductor, unless a functional current density is defined.
绞线圈电流源-用来模拟绕制的导体承载的电流。可以用来模拟各自绝缘的独立匝中的电流（好别扭），认为导体足够小以至于涡流效应可以忽略。计算时不考虑涡流和位移电流。可以施加总电流，也可以施加电流密度。除非定了电流密度函数，否则认为导体中电流密度均匀分布。
Parallel current sources connect two or more conductors in parallel to an outside source. The total current flowing through all selected conductors (including eddy and displacement currents) is specified. However, the current flowing through individual conductors in the parallel group is unconstrained and its value is computed during the solution.
并联电流源-表示与外部源相连接的并联的两个或多个导体。流过所有导体中的总电流包括涡流和位移电流，但是流过每一个导体的电流未知，可以在计算中得到。
The differences between each type of AC current source are shown below:
不同类型电流源的区别
For solid and parallel current sources, the current you specify is the total current in the conductor:
对于实体和并联电流源来说，总电流由以下几部分构成：
where:
ITotal is the total current flowing through the source. It satisfies Ohm’s law with the potential seen by the source.流过的总电流，满足欧姆定律。
ISource is the current due to the potential difference generated by the external source. It is the current that the source would supply if you reduced the potential difference by the back EMF produced by the eddy and displacement currents in the conductor.
由于外部源项的势能差而产生的电流。后面一句实在是太拗口了，哪位大佬帮帮忙。
IEddy is the eddy current induced in the conductor due to time-varying magnetic fields penetrating the conductor. 由实变磁场在导体中感应出电流。
IDisplacement is the displacement current due to time-varying electric fields in the conductor. It becomes significant only at very high frequencies. 由时变电场引起的位移电流。只有高频下才会比较明显，一般问题中可忽略不计。
For stranded current sources, the current you specify is the total source current (or source current density), Itotal = Isource. Eddy current and displacement current effects are neglected. 绞线圈型电流源中的总电流只有Isource，忽略涡流和位移电流。
