Coil arrangement for an electrical machine

A coil arrangement comprising:

• a coil formed by an electrical coil conductor, wherein the coil is configured to be arranged at an electrically conductive component of an electric machine;
• and
• an insulating arrangement configured to electrically insulate at least one turn of the electrical coil conductor of the coil from an electrically conductive element of the electric machine,
• wherein the insulating arrangement comprises a first, electrically conductive layer configured to be arranged between the turn to be insulated of the coil and the electrically conductive element, the first, electrically conductive layer being electrically connectable to the electrically conductive component,
• wherein the electrically conductive element is a laminated core of a stator or of a rotor of the electric machine on which the coil is configured to be arranged,
• wherein the insulating arrangement is a slot insulation,
• wherein the slot insulation is positioned between the coil and the electrically conductive element,
• wherein the slot insulation comprises the first, electrically conductive layer and a second, electrically insulating layer,
• wherein the first, electrically conductive layer is a conductive surface that is applied to the second, electrically insulating layer,
• wherein, as viewed in an axial direction of the electric machine, the second, electrically insulating layer is dimensioned in such a way that the second, electrically insulating layer protrudes beyond axial ends of the electrically conductive element, and
• wherein the first, electrically conductive layer is dimensioned in such a way that the first, electrically conductive layer does not protrude beyond the axial ends of the electrically conductive element.

A method for electrically insulating at least one turn of an electrical coil conductor of a coil of an electric machine, the method comprising:

• applying a first, electrically conductive layer of an insulating arrangement onto a second, electrically insulating layer of the insulating arrangement to provide a sheet-like slot insulation;
• placing the sheet-like slot insulation in a spatial region between a first tooth and a tooth adjacent to the first tooth of the electric machine such that the first, electrically conductive layer enters into electrical contact with an electrically conductive component of the electric machine;
• and
• winding the electrical coil conductor of the respective coil onto each tooth of the electric machine that is in electrical contact with the sheet-like slot insulation, so that the sheet-like slot insulation is positioned between the first tooth and the electrical coil conductor wound onto this first tooth,
• wherein, as viewed in an axial direction of the electric machine, the second, electrically insulating layer is dimensioned in such a way that the second, electrically insulating layer protrudes beyond axial ends of the electrically conductive component, and
• wherein the first, electrically conductive layer is dimensioned in such a way that the first, electrically conductive layer does not protrude beyond the axial ends of the electrically conductive component.

A method for electrically insulating at least one turn of an electrical coil conductor of a coil of an electric machine, the method comprising:

• applying a first, electrically conductive layer of an insulating arrangement onto a second, electrically insulating layer of the insulating arrangement;
• placing the electrical coil conductor into the insulating arrangement and shaping the insulating arrangement into a tubular form in such a way that the insulating arrangement provides a closed surface that surrounds each individual turn of the electrical coil conductor, so that each respective turn of the electrical coil conductor extends in a longitudinal direction within the insulating arrangement, wherein the second, electrically insulating layer is arranged within the first, electrically conductive layer and each respective turn of the electrical coil conductor is arranged within the second, electrically insulating layer;
• and
• winding the electrical coil conductor to form the coil, wherein the first, electrically conductive layer is brought into electrical contact with an electrically conductive component of the electric machine.