Electric machine rotor bar and method of making same

A method of manufacturing an electric machine comprising:

• inserting a plurality of bars into a rotor bar housing, wherein each bar of the plurality of bars comprises a first metallic material having a first electrical resistivity;
• coupling a first coupling component to the plurality of bars to electrically couple the plurality of bars together;
• and
• fully or partially surrounding the plurality of bars inserted into the rotor bar housing with a second metallic material and fully or partially surrounding the first coupling component with the second metallic material, wherein the second metallic material has a second electrical resistivity greater than the first electrical resistivity.

An electric machine comprising:

• a plurality of rotor bars;
• a first electrical coupling ring configured to electrically couple each rotor bar of the plurality of rotor bars together, wherein each rotor bar of the plurality of rotor bars comprises:
• a metallic bar comprising a first material having a first electrical resistivity;
• and
• a metallic covering surrounding at least a majority of the metallic bar, the metallic covering fully or partially surrounding metallic bar and fully or partially surrounding the first electrical coupling ring and having a second electrical resistivity greater than the first electrical resistivity.