Patent ID: 7423342

Claim:
A method for assembling semiconductor switching elements and a heat sink in a rotary electric machine, for an automobile, which has a plurality of phases and which includes a rotary electric machine part having a rotary shaft, an inverter which has an upper arm and a lower arm for each phase and which performs an electricity supply control of the rotary electric machine part, and a heat sink which is provided for each arm and each of which cools a plurality of respective semiconductor switching elements constituting the arm, each of the upper arm and the lower arm for each phase having the plurality of semiconductor switching elements, the plurality of semiconductor switching elements and the heat sink being mounted on the rotary electric machine part and surrounding the rotary shaft in the circumferential direction of the rotary shaft, wherein the method includes: a first step in which a plurality of bare chips of the plurality of semiconductor switching elements are arranged in parallel in a spaced apart manner and are directly bonded to each heat sink using a good heat conductive bonding material, and wiring parts are arranged in a spaced apart manner and are directly bonded to each heat sink using a good heat conductive bonding material; a second step which connects the bare chips to the wiring parts by wire bonding, the second step being the step after the first step; and a third step in which a resin collectively molds and seals the bare chips, the wiring parts, and the heat sink in a state that output terminal portions of the wiring parts and fins of the heat sink are exposed to the outside of the resin, the third step being the step after the second step.