## Electronics

#### Copper loss in synchronous reluctance motor

• sampathkumar
Subscriber

I observe three losses related to copper loss in Ansys Maxwell simulation like stranded, stranded AC, strandedR.i use strands in my winding...can you please tell which one should I consider to calculate efficiency

• GLUO
Ansys Employee

Hi @sampathkumar,

You could use stranded loss, however, AC effect is not considered. If you use Litz wire model in your material of the winding, you could use StrandedLossAC.

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:

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

o             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.

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

o             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.

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

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

o             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).

GL