Patent ID: 6285100
Filing Date: 2001-09-04
Classification: H02K

Abstract:
Rectifier component whose positive and negative diodes are arranged at a positive and negative heat sink, respectively, the positive heat sink and negative heat sink being electrically insulated from one another by an insulating plate and fastened to a front area of an end shield of the machine so as to be sandwiched together with a circuit board for diode connections, wherein waste heat of the rectifier component is to be carried off from an upper heat sink via a heat-conducting contact of a lower heat sink at an end shield on the one hand and, on the other hand, by at least one cooling air flow of a fan of the machine in that this upper heat sink is provided with a plurality of cooling air openings arranged next to one another at the inner circumference to allow the cooling air flow to pass through axially, axial cooling fins (39) are formed at the upper heat sink (27) at least at some of the cooling air openings (38) of the upper heat sink (27), there is a distance between the upper heat sink (27) and the circuit board (30), which distance forms an air gap (41) for a radial cooling air flow (25a) from the outer circumference of the upper heat sink (27) to some of its cooling air openings (38a) at the inner circumferential area, and circumferentially extending cooling fins (39) formed at the plurality of cooling air openings (38) alternate with cooling fins (39a) formed at other cooling air openings (38a) only at the inner circumference of the heat sink (27), so that the radial cooling air flow (25a) can arrive without hindrance at the fan (24) through the other cooling air openings (38a).