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.

This issue has been corrected.

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).

This issue has been corrected.