Maxwell StrandedLoss and StrandedLossAC difference

一、Ansys define

For 2DXY designs, the length is given by Set Model Depth, while for RZ designs the volume is based upon the rotation of the cross-section around the symmetry axis.

 

There are three types of stranded loss quantities: StrandedLoss, StrandedLossAC, and StrandedLossR, which represent the loss in a 2D or 3D winding utilizing multi-turn coil terminals.

 

StrandedLoss is dependent on the object’s material conductivity of a stranded source. It represents the loss due to the DC resistance only and uses the cross-sectional area of the object that is assigned with the excitation. Where J is the current density, it is calculated by

• When Litz wire is not defined, StrandedLoss is computed by assuming fill factor = 100% (the ratio of net conductor area to coil terminal area).

• When Litz wire is defined, StrandedLoss is computed by using the actual fill factor based on the specified Litz stranding and represents the DC loss only.

• StrandedLoss does not include the losses of end-coil resistance in 2D.

• StrandedLoss can be used to scale the loss density to a coupled thermal analysis.

 

StrandedLossAC is reported when using Litz wire model, and is dependent on the object’s material conductivity of a stranded source. It represents the loss due to the DC resistance as well as AC eddy current losses due to proximity effects and skin effects.

• StrandedLossAC = StrandedLoss + AC eddy current losses due to proximity effects and skin effects.

• StrandedLossAC does not include the losses of end-coil resistance in 2D.

• StrandedLossAC can be used to transfer loss density to a coupled thermal analysis.

 

StrandedLossR represents the loss based on I² times the resistance R, by using the resistance value entered in the Winding properties for a voltage type winding only (Reported for a stranded voltage source not in an external circuit)

 

二、Maxwell Setup

三、Example

　　从同一个模型的仿真结果可以看出，StrandedLossAC 比StrandedLoss 大

 

 

四、Conclusion

　　StrandedLoss 仅包含直流（DC Loss）损耗结果，StrandedLossAC 包含直流加交流损耗（AC+DC Loss）结果。