Method for producing an electromagnet

An electromagnet produced by a method comprising:

• joining a plurality of metal plates into a metal core by packing, wherein each metal plate includes plastically shaped areas and the plastically shaped areas of the metal plate are connected by force-locking and/or form-fitting to the plastically shaped areas of at least one adjacent metal plate in a joining direction;
• heating at least one metal wire such that a length of the at least one metal wire is increased;
• and
• thereafter, winding at least one metal wire around the metal core, wherein a multitude of windings are wound around the metal core, the windings being placed next to each other and/or on top of one another, and wherein a partial region of each winding is oriented parallel to the joining direction.

A rotor of an electric, externally excited synchronous machine having at least one electromagnet produced by a method comprising:

• joining a plurality of metal plates into a metal core by packing, wherein each metal plate includes plastically shaped areas and the plastically shaped areas of the metal plate are connected by force-locking and/or form-fitting to the plastically shaped areas of at least one adjacent metal plate in a joining direction;
• heating at least one metal wire such that a length of the at least one metal wire is increased;
• and
• thereafter, winding at least one metal wire around the metal core, wherein a multitude of windings are wound around the metal core, the windings being placed next to each other and/or on top of one another, and wherein a partial region of each winding is oriented parallel to the joining direction, and
• wherein the electromagnet forms a rotor pole.