Patent ID: 8120171
Filing Date: 2012-02-21
Classification: H01L,H05K,Y10T

Abstract:
1. A power drive unit for supplying current to an electric motor, comprising; a heat sink connected to the power drive unit to dissipate heat generated by the power drive unit in supplying current to the electric motor; a power module pressed by a press member to the heat sink to be fastened thereto; a spring member that has a substantially circular shape from a top view with a center engagement hole and a perimeter surface and is installed between the power module and the press member; a projection that protrudes from the press member to be engaged with the center engagement hole; a case that accommodates the press member; and a rotation preventer provided on the case to prevent the press member from rotating; wherein the perimeter surface of the spring member is in contact with the power module pressing the power module toward the heat sink.