Power electronics arrangement for an externally excited synchronous machine and motor vehicle

A power electronics arrangement for an externally excited synchronous machine, comprising:

• an inverter, including a plurality of inverter power modules the plurality of inverter power modules including one inverter power module for each phase of the externally excited synchronous machine;
• and
• an exciter power module having an exciter circuit, a common heat sink having a cavity, and an exciter cooling structure, the inverter and exciter power modules being secured and thermally coupled to the heat sink for cooling and the exciter cooling structure positioned adjacent to the exciter power module in the cavity,
• wherein the cavity includes at least one inverter cooling structure, including one inverter cooling structure for each inverter power module each inverter cooling structure of the at least one inverter cooling structure positioned adjacent a respective inverter power module,
• wherein the cavity is configured to receive a flow for active cooling of the inverter and exciter power modules of a cooling fluid entering through an inflow opening of the common heat sink to an outflow opening of the common heat sink,
• wherein the exciter and inverter cooling structures each define cooling pathways separate from other exciter and inverter cooling structures,
• wherein the cooling pathways of each inverter power module of the plurality of inverter power modules run parallel to one another, and
• wherein each cooling pathway is configured to underlie and primarily cool only a respective one of the plurality of inverter power modules.