A method of annealing an iron core includes placing the iron core on a placement surface of an annealing jig formed of a material having a coefficient of linear expansion different from that of a material of the iron core, and annealing the iron core placed on the placement surface. Multiple protrusions that support the iron core from below and are spaced apart from each other are formed on the placement surface.

A method of annealing an iron core includes placing the iron core on a placement surface of an annealing jig formed of a material having a coefficient of linear expansion different from that of a material of the iron core, and annealing the iron core placed on the placement surface. Multiple protrusions that support the iron core from below and are spaced apart from each other are formed on the placement surface.

A method for manufacturing a laminated iron core includes: arranging N heating units in the laminated iron core such that the N heating units are aligned in a circumferential direction of the laminated iron core, where N is a natural number of two or more; and heating N regions of the laminated iron core that face the N heating units with the N heating units. The heating includes switching operation of the N heating units from one to less than N at a time.

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.