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)


(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 that this problem doesn't impact the phase resistance value, nor the resulting computations, like the total Joule losses in the winding. (ref.: FXM-16113).

Thermal computations - Problem of convergency

When losses are very high, there is a convergence issue with the Thermal computations (ref.: FXM-15900).

Wrong thermal analysis

Zero values are allowed for housing, bearing or shaft dimensions but lead to the wrong thermal analysis (ref.: FXM-14705).

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).

When creating a Flux skewed project, issue with project

=> If you save and close your project, it is impossible to open and solve it

=> If you solve the project, it is impossible to delete results and rerun the project (ref.: FXM-15638).

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).

Export to FeMT with too long output path

The Flux script crashes when the output path for FeMT export is too long (ref.: FXM-15471).

Excel export does not work for the test Model - Maps

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

Fault in the coupling FluxMotor-HyperStudy

An error in the FluxMotor process doesn't stop the HyperStudy execution (ref.: FXM-15402).

Script Factory does not stop correctly.

This occurs if the FluxMotor process has been killed externally. Then, Script Factory is not able to get back to a valid state, neither automatically nor after a kill of the process (ref.: FXM-15140)

Issue with exported Flux Skew projects

After exporting a Flux Skew project, if the user solves the project, deletes the results, and then solves again, the running of the project fails (ref.: FXM-15075).

Null values are not well managed while designing the Frame and shaft.

Null values are allowed for designing the housing, bearing, or shaft dimensions, but this leads to the wrong thermal analysis. It is highly recommended not to use null values for the considered inputs (ref.: FXM-14705).

Error while opening a motor (2020.1) with null shaft extension.

Opening a motor built with version 2020.1 (or older) with a null shaft extension leads to an error. With new versions, a null shaft extension is forbidden (ref.: FXM-14684).

The interwire space is not well defined.

The resulting value of the interwire space applied in the finite element model is twice the value set in the user inputs (ref.: FXM-14672).

Air material properties are wrong for high temperature.

This issue impacts our internal computation processes during transient thermal solving. Indeed, some iterations involve very high temperature (more than 3000 °K), according to the Newton Raphson non-linear solving method. During the resolution, this can lead to negative conductivity and viscosity, which may make the computation fail (ref.: FXM-14465).
Note: In case of a problem, an “Air material” with the right parameters can be provided.

When an IO cannot be loaded, the test results are not accessible.

When an IO cannot be loaded, the whole process that loads all the test results is stopped. As a result, no test is visible, although the issue may concern one result in a particular test (ref.: FXM-13941).

A wedge and/or inter-coil insulation region leads to a wrong slot equivalent thermal conductivity.

The slot radial thermal conductivity, which is automatically provided by the FluxMotor® in the "Cooling-Internal" context, and used in all thermal tests, is wrong if the slot contains faces "wedge" or "inter-coil insulator" (ref.: FXM-13896).

Power electronics and coupling with HyperStudy®

For tests where the settings "Electronics" is available, data like power electronics stage, maximum efficiency, and its rated power can be selected for generating a connector for HyperStudy®, but it should not be.

In the Export-HyperStudy® area, when the selected test is “Working Point, T-N”, the settings of “Electronics” - "Max efficiency", and "Rated Power" - are exported even if the associated option is not selected (ref.: FXM-13726).

Winding environment – MMF computation

The counter-clockwise sequence (MMF computation) is not considered in the Altair® Flux® model, which one can export. Only the clockwise phase sequence is considered (ref.: FXM-10280).

Using "phase sequence" set to "Counterclockwise" leads to wrong results in tests (ref.: FXM-13358).

Flux density isovalues

When a skewed topology is considered (synchronous machines or induction machines), the flux density isovalues, the vector potential isolines, and the rotor bars current density isovalues are not displayed (ref.: FXM-12564).