# All machines

## Negative end winding resistance with low value of X-Factors.

Here are a few explanations for this issue:

This issue has been introduced while considering the solid conductors inside the slot. Since the solid conductors are considered, the corresponding resistance (in the straight part of the machine) is deduced from the material properties and the size of the wires.
• With X-factor=1, we have (Rphase 0)=(Rstraight 0)+(R end winding 0)

Rphase 0 is the initial value of the phase resistance (with X-Factor = 1)

RStraight 0 is the initial value of the phase resistance in the straight part of the machine (with X-Factor = 1)

R end winding 0 is the initial value of the phase resistance in the straight part of the machine (with X-Factor = 1)

• With X-factor≠1, we have (Rphase 1)=(Rstraight 1)+(R end winding 1)

Rphase 1 is the initial value of the phase resistance (with X-Factor ≠1)

RStraight 1 is the initial value of the phase resistance in the straight part of the machine (with X-Factor ≠1)

R end winding 1 is the initial value of the phase resistance in the straight part of the machine (with X-Factor ≠1)

The target is to get the following results:

(Rphase 1)=XFactor×(Rstraight 0)

With

(Rstraight 1)= (Rstraight 0)

This leads to the value for the end winding resistance:

(R end winding 1)=XFactor×(Rstraight 0+R end winding 0)-(Rstraight 0)

(R end winding 1)=Rstraight 0×(XFactor-1)+XFactor×(R end winding 0)

When X-Factor is very low, the end winding resistance can be negative.

We will reconsider how to apply the calibration factor to the winding resistance. Perhaps this will lead to applying the X-Factor only to the end winding and the winding connections not to then straight part.
Note: This problem doesn't impact the phase resistance value, nor the resulting computations, like the total Joule losses in the winding. (ref.: FXM-16113).
Note: When a non-relevant winding resistance factor leads to a negative end-winding resistance the “DESIGN” and “WINDING” buttons become red, a warning message asks to the user to increase the winding resistance factor and the tests cannot be performed

This issue has been corrected.

## Trouble with Script - Export script - Export python - Export python in ScriptFactory

Removing selected folders in which are stored python files leads to troubles while suing the “Search directory function” (ref.: FXM-16164).

This issue has been corrected.

## Hairpin architecture

Solving tests or exporting projects to Flux is not allowed when the Hairpin winding is built with two layers. This will be fixed for the next version (ref.: FXM-15516).

This issue has been corrected.

## Excel export does not work for the test Model - Maps

For the Synchronous machines with Permanent Magnets – SMPM (ref.: FXM-15465).

This issue has been corrected.