Electrotechnical coil, method for producing same, and electromagnet or electric machine comprising at least one such coil

Method according to one of the preceding claims, characterized in that step B comprises at least one of the following sub-steps:

• a. Step B1:
• providing a multi-part shaping tool (2, 3) which, in a composite state, forms a cavity for receiving the coil (1), wherein the cavity is preferably matched to the inner contour and/or the outer contour of the coil (1), wherein preferably a punch (2) forms an upper part of the shaping tool (2, 3) and/or a die (3) forms a lower part of the shaping tool (2, 3).
• b. Step B2:
• arranging the coil (1) in the shaping tool (2, 3), preferably in such a way that the coil (1) bears radially on the inside and/or radially on the outside against the shaping tool (2, 3), wherein preferably the coil (1) bears radially on the inside against the punch (2) and/or bears radially on the outside against the die (3).
• c. Step B3:
• moving at least two parts of the multi-part shaping tool (2, 3) relative to one another along the coil axis (A) while reducing the volume of the cavity, wherein preferably the punch (2) enters the die (3) along the coil axis (A).
• d. Step B4:
• shaping the coil (1) by compressing the coil (1) along the coil axis (A), wherein preferably the windings of the coil (1) are pressed against one another starting radially on the inside, so that the coil material is displaced outwards in the radial direction (R) with respect to the coil axis (A), preferably in such a way that the gaps between the windings are reduced or eliminated.
• e. Step B5:
• changing the cross-section (Q, Q′) of the at least one winding, preferably during step B4, so that an angle (a) which the upper side and/or the lower side of the cross-section (Q, Q′) encloses with a plane (E) intersecting the coil axis (A) perpendicularly changes and/or decreases by at least 1°, 1.5°, 2°, 2.5°, 3°, 4° or 5° with respect to the non-deformed state.
• f. Step B6:
• cutting off a sprue of the coil (1).
• g. Step B7:
• forming at least one connection region for an electrical contacting of the coil (1), preferably by embossing.
• h. Step B8:
• calibrating the coil (1) to final contour, wherein preferably the shaping tool (2, 3) calibrates the coil (1) radially on the inside and/or radially on the outside and/or at the upper and/or lower axial end with respect to the coil axis (A), wherein particularly preferably the punch (2) calibrates the coil (1) radially on the inside and/or at the upper axial end and/or the die (3) calibrates the coil (1) radially on the outside and/or at the lower axial end.
• i. Step B9:
• electrically insulating the at least one winding of the coil (1), preferably by immersing the coil (1) in insulation varnish or by coating or by sheathing it with an insulation layer.