Perspectives and application limits for laser cutting of rotor and stator laminations

Stefan Grahle, TRUMPF Sachsen GmbH, Germany

Conventional mechanical shear cutting is considered the best choice as regards its effect on the magnetic properties of laminations, on cutting quality and on the costs involved. On the other hand, the alternative processing method of laser cutting has so far only met with limited interest from companies, as laser cutting is seen as more expensive and having a negative effect on the magnetic properties of laminations.

To define the outlook and application limits of laser cutting and compare the processing methods of laser and shear cutting, findings are presented from market analyses, as well as the effects of the two methods on the lamination properties, and cost comparisons.

At the start of the presentation, current market requirements are set out and assessed.

One main focus of the presentation is to present findings from scientific investigations into the following topics:

-          the effect of the processing methods on the electromagnetic properties of the lamination (magnetic hysteresis loss, field strength required)

-          flash (amount of flash, type of flash) depending on processing method

-          contour precision and cutting quality (roundness, concentricity)

Subsequently, the results are presented of investigations into manufacturing costs of the different manufacturing processes and break-even points are indicated.

Finally, all the results are assessed, compared and evaluated.

The findings thus acquired can then be used to determine the “perspectives and application limits for laser cutting of rotor and stator laminations”.