Quality Assurance for Sheet Stacks

The sheet stack is built out of many single sheets, including crosssection slot geometry for the hairpins, permanent magnet slots and the outer- and inner diameter of the sheet stack assembly. Single 2D sheets provide the foundation for constructing sheet stacks for rotors and stators. The single sheets are either punched or laser cut from electrical steel sheets, and are less than 1mm thick. The final sheet stacks require a large quantity of individual sheets.

During the assembly of the sheet stack, the positioning of the single sheets for laser welding has a major impact on the geometry of the stator and rotor slots, which are mated with the hairpins and the magnets. After welding, it is important to inspect the dimensions and positions of the slots, as well as the height and diameters of the sheet stack. The contour features on the assembly are also important for the process of inserting the hairpins and magnets. ZEISS multisensor coordinate measuring machine can be combined with 2D cameras and whitelight confocal sensors to perform even more thorough inspections – for quality assurance you can rely on.