Power module

Abstract

A first inverter circuit (3A) and a second inverter circuit (3B) are formed on a substrate (25). The first inverter circuit (3A) outputs a first three-phase alternating current generated by a first group of switching elements (SW1, SW2, SW3, SW4, SW5, SW6) via a first output busbar (28UA), a second output busbar (28VA), and a third output busbar (28WA). A second inverter circuit (3B) outputs a second three-phase alternating current generated by a second group of switching elements (SW7, SW8, SW9, SW10, SW11, SW12) via a fourth output busbar (28UB), a fifth output busbar (28VB), and a sixth output busbar (28WB). The fourth output busbar (28UB) is in close proximity to the first output busbar (28UA), the fifth output busbar (28VB) is in close proximity to the second output busbar (28VA) and the sixth output busbar (28WB) is in close proximity to the third output busbar (28WA). The first group of switching elements (SW1, SW2, SW3, SW4, SW5, SW6) and second group of switching elements (SW7, SW8, SW9, SW10, SW11, SW12) are arranged so that the direction of the current in the fourth output busbar (28UB) is opposite to the direction of the current in the first output busbar (28UA), the direction of the current in the fifth output busbar (28VB) is opposite to the direction of the current in the second output busbar (28VA), and the direction of the current in the sixth output busbar (28WB) is opposite to the direction of the current in the third output busbar (28WA).

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