Control apparatus with improved structure for cooling circuit elements

摘要

A control apparatus such as an inverter includes a hollow body having generally a rectangular cross-section, composed of sides of sheet metal with upper and lower open ends shielded by cast hollow frames, each having a similar cross-section. Electrical circuit elements are mounted to one of the sides of the hollow body through an opening therein. Ventilating fans are mounted to at least one of the hollow frames for cooling the electrical circuit elements.