Abstract: A power converting device includes a main body having a heat producing part housed therein, a fan case having a cooling fan therein for cooling the heat producing part provided in the main body, and a housing portion in the main body which houses the fan case. The fan case and the housing portion are interconnected so that the fan case is pivotally attached to and detached from the housing portion.

Abstract: An inverter apparatus includes heating components housed in an inverter main body and cooling fans for cooling the heating components. The inverter apparatus includes a fan unit case in which the cooling fans are housed as one integral unit, a housing space formed on an outer side of a ceiling surface of the inverter main body, and a fan cover that fixes the fan unit case. The fan unit case is slid to be housed in the housing space. The inverter apparatus makes it easier to replace cooling fans, reduce the number of components, enhance cooling efficiency, and secure high reliability.

Abstract: A heat sink is provided that makes air velocity between cooling fins uniform in order to improve heat dissipation performance, thereby realizing a reduction in weight and achieving high cost performance. Distal ends of fins disposed substantially in front of a cooling fan are located on the uppermost stream side in the flowing direction of cooling air, and distal ends of fins on both sides in the width direction of the heat sink are located on the lowermost stream side. Each of the fins is preferably provided with a slope so that the height of the fin gradually increases from the distal end thereof in a direction from the upstream side to the downstream side in the flowing direction of cooling air.

Abstract: A heat sink is provided that can prevent the velocity of air flowing between fins in the vicinity of the component mounting space from decreasing. In the heat sink, a plurality of fins and the component mounting space are disposed on a fin unit side of the base. A lateral-end fin portion in the vicinity of the component mounting space is provided with an opening for taking in air and discharging air from a side.

Abstract: An inverter apparatus includes heating components housed in an inverter main body and cooling fans for cooling the heating components. The inverter apparatus includes a fan unit case in which the cooing fans are housed as one integral unit, a housing space formed on an outer side of a ceiling surface of the inverter main body, and a fan cover that fixes the fan unit case. The fan unit case is slid to be housed in the housing space. The inverter apparatus makes it easier to replace cooling fans, reduce the number of components, enhance cooling efficiency, and secure high reliability.

Abstract: In an inverter device, two short-circuiting bars of a direct current circuit portion are each formed of a conducting plate bent so as to have a crank-shaped cross section, one of the outside flat surfaces of each of the two conducting plates is connected to the input end of each semiconductor switching element, and the other outside flat surfaces of the respective conducting plates are superimposed on each other, in close proximity, via an insulating sheet. This construction reduces the difference in wiring inductance between the closest element to and the farthest element from a smoothing capacitor when the device is turned on, and also decreases the current imbalance between them.