A 3D semiconductor device including: a first level including a first single crystal layer and first transistors, which each include a single crystal channel; a first metal layer with an overlaying second metal layer; a second level including second transistors, overlaying the first level; a third level including third transistors, overlaying the second level; a fourth level including fourth transistors, overlaying the third level, where the second level includes first memory cells, where each of the first memory cells includes at least one of the second transistors, where the fourth level includes second memory cells, where each of the second memory cells includes at least one of the fourth transistors, where the first level includes memory control circuits, where second memory cells include at least four memory arrays, each of the four memory arrays are independently controlled, and at least one of the second transistors includes a metal gate.

A cleaning station for removing surface impurities from the surface of a cylindrical magnetic rotor having an axis; the cleaning station comprises: a seat for housing the magnetic rotor in a rotatable manner about its axis; a first pin having an axis parallel to the axis of the magnetic rotor when housed in the seat, wherein the first pin is rotatable about its axis and supports a roll of adhesive tape; a second pin having an axis parallel to the axis for the first pin; wherein the second pin receives an initial unwinding end of the roll of adhesive tape supported on the first pin and is rotatable about its axis to progressively wind the adhesive tape about its axis during unwinding from the first pin; a motorization for commanding the unwinding of the adhesive tape from the first pin and the winding of the adhesive tape on the second pin; a pusher device configured to press the adhesive tape as it passes from the first and to the second pin against the magnetic rotor housed in the seat so that by dragging, the motion of the adhesive tape commands the rotation of the magnetic rotor about its axis and the surface impurities on the magnetic rotor migrate from the magnetic rotor to the adhesive tape remaining attached on the adhesive of the adhesive tape. Main figure: FIG. 6

A cleaning station for removing surface impurities from the surface of a cylindrical magnetic rotor having an axis; the cleaning station comprises: a seat for housing the magnetic rotor in a rotatable manner about its axis; a first pin having an axis parallel to the axis of the magnetic rotor when housed in the seat, wherein the first pin is rotatable about its axis and supports a roll of adhesive tape; a second pin having an axis parallel to the axis for the first pin; wherein the second pin receives an initial unwinding end of the roll of adhesive tape supported on the first pin and is rotatable about its axis to progressively wind the adhesive tape about its axis during unwinding from the first pin; a motorization for commanding the unwinding of the adhesive tape from the first pin and the winding of the adhesive tape on the second pin; a pusher device configured to press the adhesive tape as it passes from the first and to the second pin against the magnetic rotor housed in the seat so that by dragging, the motion of the adhesive tape commands the rotation of the magnetic rotor about its axis and the surface impurities on the magnetic rotor migrate from the magnetic rotor to the adhesive tape remaining attached on the adhesive of the adhesive tape. Main figure: FIG. 6

The present invention relates to a 3D-printed magnetic core of an electric machine and a method for its manufacture. The magnetic core comprising a multi-element assembly where the elements have trapezoidal lamellae of variable thickness with gaps of variable thickness between them such that when assembled they form a dovetail-like connection. The method for manufacturing the magnetic core element comprises an additive manufacturing using 6.5% electrical steel.

The present invention relates to a 3D-printed magnetic core of an electric machine and a method for its manufacture. The magnetic core comprising a multi-element assembly where the elements have trapezoidal lamellae of variable thickness with gaps of variable thickness between them such that when assembled they form a dovetail-like connection. The method for manufacturing the magnetic core element comprises an additive manufacturing using 6.5% electrical steel.