| US 7,545,642 B2 | ||
| Automotive dynamoelectric machine | ||
| Nobuaki Uehara, Tokyo (Japan); Tetsuro Ogushi, Tokyo (Japan); Yoshihito Asao, Tokyo (Japan); and Hitoshi Isoda, Tokyo (Japan) | ||
| Assigned to Mitsubishi Electric Corporation, Tokyo (Japan) | ||
| Filed on Aug. 17, 2006, as Appl. No. 11/505,393. | ||
| Claims priority of application No. 2005-249548 (JP), filed on Aug. 30, 2005. | ||
| Prior Publication US 2007/0046112 A1, Mar. 01, 2007 | ||
| Int. Cl. H05K 7/20 (2006.01) | ||
| U.S. Cl. 361—697 [310/58; 310/64; 310/71] | 8 Claims |
| 1. An automotive dynamoelectric machine comprising:
a rotor that is rotatably disposed inside a case by means of a shaft;
a stator that is disposed inside said case so as to surround an outer circumference of said rotor;
a heat-generating element that is mounted to an element mount surface of a heatsink and that controls rotation of said rotor
electrically;
an air intake aperture and an air discharge aperture that are disposed through said case; and
a fan that is fixed to an axial end surface of said rotor and that rotates with said rotor so as to generate a cooling airflow
that is sucked into said case through said air intake aperture and is discharged outside said case through said air discharge
aperture,
wherein:
a large number of ventilating apertures that have a circular cross section are disposed through said heatsink so as to extend
from an air intake apertured surface to an air discharge apertured surface so as to have aperture directions that are parallel
to each other and parallel to said element mount surface; and
said heatsink is disposed such that said air intake apertured surface faces said air intake aperture and said aperture directions
of said ventilating apertures are aligned in a direction of flow of said cooling airflow.
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