HEAT SINK, ELECTRIC POWER CONVERSION DEVICE, MOTOR UNIT, AND ELECTRIC VEHICLE

• Main Authors: SAIKI YUJI, UEDA MAKOTO
• Format: Patent
• Language: English; Japanese
• Published: 29.07.2021
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; BASIC ELECTRIC ELEMENTS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; PRINTED CIRCUITS; SEMICONDUCTOR DEVICES

To suppress the decrease in cooling efficiency on the downstream side of airflow in an air-cooled heat sink of an electric power conversion device.SOLUTION: In the electric power conversion device, a heat sink 1 dissipating heat from a plurality of heat-generating components 5 arranged in a first direction includes a base unit 11, a first fin 121, and a second fin 122. The first and second fins 121 and 122 protrude from a surface of the base unit 11 spreading in a first direction and in a second direction perpendicular to the first direction and are arranged in parallel with each other along the first direction. A wind tunnel portion 13 extending in the first direction is formed between the first fin 121 and the second fin 122. The wind tunnel portion 13 has a constricted portion that narrows in width in the second direction as the wind tunnel portion 13 is directed towards one side of the first direction.SELECTED DRAWING: Figure 4 【課題】電力変換装置の空冷式ヒートシンクにおいて、空気流の下流側で例脚光率が低下することを抑制する。【解決手段】電力変換装置において、第１方向に配列する複数の発熱部品５を放熱するヒートシンク１は、ベース部１１と、第１フィン１２１と、第２フィン１２２と、を備える。第１フィン１２１及び第２フィン１２２は、ベース部１１の第１方向及び該第１方向と垂直な第２方向に広がる面から突出し、第１方向に沿って並行に配置される。第１フィン１２１と第２フィン１２２との間には、第１方向に延びる風洞部１３が形成される。風洞部１３は、第１方向一方に向かうにつれて第２方向幅が狭くなる括れ部を有する。【選択図】図４