Induction machines – Motor Factory – Test environment

The computation of power balance for IMSQ in “accurate mode” is not well balanced.

In the test “working point – sine wave – motor – U, f, N”, while computing the power balance with the accurate mode (i.e., with the transient application) the results are not well balanced. Indeed, the difference between the electrical power and the power on the shaft is not exactly equal to the total amount of losses.

Depending on the considered slip the difference can be about a few percent (ref.: FXM-16121 & FXM-16561).
Note: The number of computation points per electrical period and the number of considered electrical periods (user’s inputs) have an impact on the accuracy of the results.
Note: The displayed value (in FluxMotor) of the mechanical torque is based on the Finite Element computations and considers the iron losses and the mechanical losses.
Note: The rotor Joule losses (squirrel cage) result from the Finite Element computations.

The computation of the efficiency map (U, I) with mechanical losses can fail.

This issue raises a null-pointer exception (ref.: FXM-16157).

The flux density is not displayed in accurate mode computation.

While computing a working point (U, f, N) for an induction machine with a skewed squirrel cage and outer rotor the flux density inside the airgap is not displayed. (ref.: FXM-16154).

Possible negative AC Joule losses

While computing a working point in accurate mode, the AC Joule losses can be negative if they are computed on a half electrical period with a low number of computations per electrical period (ref.: FXM-16919).

Error when exporting and solving a project in Flux Skew – Transient application.

This issue occurs when the user input “Represented coil conductors” is set to All phases (ref.: FXM-15877).

Scalar Maps or Efficiency map (U,f) tests fails with hairpin winding technology

Sometimes, the tests Scalar Maps and Efficiency map (U,f) are not correctly solved with a hairpin winding configuration, like for the Motor M1 of the reference catalog (ref.: FXM-15843).

Power balance of No-load working point

Sometimes, computation of the no-load working point (slip=0.1%) leads to a NaN (Not a Number) result. The computed amount of iron losses is not consistent with the power balance (ref.: FXM-12600).

Torque slip curve

Test results are not continuously consistent over a torque slip curve. This occurs with the test Performance mapping T(Slip) - induction machines with a skewed squirrel cage. When the user targets a working point as an added value to be computed with the whole Torque-slip curve, sometimes this additional working point doesn't belong to the curve (ref.: FXM-12599).