Patent ID: 9742244
Date: 2017-08-22
CPC Classifications: B62D,H02K

Claim:
1. A driver device comprising: a housing; a stator disposed inside the housing; a rotor rotatably disposed inside of and rotating relative to the stator; a rotation shaft attached to and having one body with the rotor, the rotation shaft rotatably supported by the housing and having one end portion extending outside of the housing; a heat sink attached to the housing at a position that intersects an extension line of the one end portion of the rotation shaft; a substrate attached to the heat sink at a position between the heat sink and the housing; at least one semiconductor module attached to the heat sink; a sensor target disposed on the one end portion of the rotation shaft at a position outside of the housing; and a rotation angle sensor disposed on the substrate for detecting a rotation angle of the sensor target, wherein the substrate has a center part on which the rotation angle sensor is attached and a periphery portion that is attached to the heat sink, the heat sink includes (i) a cylinder part that is continuously formed to extend along an outer periphery portion of the substrate, when seen from an axial direction of the rotation shaft to overlap along an outer periphery portion of the substrate, (ii) a bottom part positioned on a housing side of the cylinder part, and (iii) a flange part protruding radially outward from the bottom part and fixed to the housing, and the height of the cylinder part of the heat sink being the same at all portions of the extension along the outer periphery portion.