Electronic control device for use in electrical servo-steering system, has heat sink formed from heat sink main body that includes end surfaces, which are arranged opposite to inner wall surfaces of one of opening areas of housing

摘要

The control device (1) has a housing (3), which is made of an insulating resin and includes opening areas. A heat sink (5) is fastened to an end of the housing, and a power device i.e. semiconductor control element (2), is fastened to the heat sink. A circuit board (4) is arranged opposite to the heat sink. The heat sink is formed from a heat sink main body and an isolating film, which is formed at a surface of the main body at a side. The main body has outer circumference end surfaces, which are arranged opposite to inner wall surfaces (3d) of one of the opening areas of the housing.