Multi-filar bar conductors for electric machines

A stator for an electric machine having an axis, a radial direction extending outward from the axis, and a tangential direction perpendicular to the radial direction, the stator comprising:

• a plurality of conductor slots, wherein each conductor slot is substantially parallel to the radial direction;
• a first multi-filar conductor disposed within one of the plurality of conductor slots, including:
• a first solid core;
• a second solid core directly contacting the first solid core along a first bare interface,
• a first insulation layer surrounding the first and second solid cores, wherein the first insulation layer does not pass through the first bare interface, such that there is no insulation between the first solid core and the second solid core;
• a second multi-filar conductor disposed within the same conductor slot as the first multi-filar conductor and one of above and below the first multi-filar conductor in the radial direction, including:
• a third solid core;
• a fourth solid core directly contacting the third solid core along a second bare interface,
• a second insulation layer surrounding the third and fourth solid cores, wherein the second insulation layer does not pass through the second bare interface, such that there is no insulation between the third solid core and the fourth solid core;
• and
• wherein the second multi-filar conductor is not substantially identical to the first multi-filar conductor.