Patent ID: 8796971
Filing Date: 2014-08-05
Classification: B62D,H02K

Abstract:
1. A motor drive apparatus for driving a n-phase AC motor by converting a DC current to a n-phase AC current with “n” being an integer equal to or greater than 3, the motor drive apparatus comprising: 2n-units of inverter semiconductor switching elements forming high-side arms and low-side arms of an inverter circuit; n-units of motor relay semiconductor switching elements provided at an output side of the inverter circuit and capable of shutting off a current supply path to the motor; a heat sink mounting thereon the inverter semiconductor switching elements and the motor relay semiconductor switching elements and capable of absorbing heat; and an electric circuit substrate connected to leads of the inverter semiconductor switching elements and the motor relay semiconductor switching elements, wherein the heat sink has a first mounting part formed along one end thereof and a second mounting part formed perpendicularly to the first mounting part in a direction from the one end towards an other end opposite to the one end, wherein the n-units of the motor relay semiconductor switching elements are mounted on the first mounting part of the heat sink, and wherein at least n-units of inverter semiconductor switching elements of the 2n-units of inverter semiconductor switching elements are mounted on the second mounting part of the heat sink.