Patent ID: 7397223

Claim:
An inverter-integrated electrical rotating machine comprising a electrical rotating machine that has a cooling fan fixed on a rotary shaft and sucks a cooling air flow from one end wall of a housing, and an inverter device that is situated on an outer side in an axial direction from the one end wall of the housing and fixed on the housing, wherein the inverter device has at least plural switching devices forming an inverter circuit that converts input DC power to AC power and feeds a stator coil of the electrical rotating machine, a control circuit that controls the inverter circuit, a heat sink case that surrounds and houses the switching devices and the control circuit and also houses wirings for connecting the switching devices and the control circuit, and an inverter case that integrally fixes and houses the heat sink case, the heat sink case has a wheel-like bottom plate part extended substantially in a radial direction, a small-diameter cylindrical inner circumferential lateral plate part integrally extended from the bottom plate part toward one end wall of the housing while securing a predetermined space with respect to a cover surrounding the rotary shaft, a large-diameter cylindrical outer circumferential lateral plate part integrally extended from the bottom plate part toward the one end wall of the housing, and a ring-shaped aperture opened toward the one end wall of the housing, with the bottom plate part, the inner circumferential lateral plate part and the outer circumferential lateral plate part being made of a highly thermally conductive metal material as a cooling heat sink, and forming an outer circumferential cooling air passage between the outer circumferential lateral plate part and the inverter case and an inner circumferential cooling air passage between the cover and the inner circumferential lateral plate part, and a cooling air flow that is led in from a cooling air flow suction hole formed in the end wall of the inverter case flows in an axial direction along the outer circumferential cooling air passage and the inner circumferential cooling air passage and then flows into the housing.