Patent ID: 7633758
Filing Date: 2009-12-15
Classification: H01L,H02M,H05K

Abstract:
1. A multiphase inverter, comprising: a first arm module which is formed in a card shape, the first arm module comprising: a plurality of first phase connecting terminals which, respectively, extend from the first phase heat sink plates toward a second direction substantially perpendicular to the first direction so as to protrude from the first phase heat sink plates, the first phase connecting terminals being, respectively, connected with the terminals of the motor; and a first common connecting terminal which is connected with the higher voltage terminal of the power source and extends from the first common heat sink plate toward the second direction so as to protrude from the first common heat sink plate; a second arm module which is formed in a card shape, the second arm module comprising: a plurality of second current converting elements which are disposed along the first direction, each second current converting element having a direct current electrode and an alternating current electrode, wherein the phase currents of the multiphase alternating current. respectively, flow through the second current converting elements, and wherein the order of a plurality of phases of the multiphase alternating current at the second current converting elements along the first direction is the same as the order of the phases of the multiphase alternating current at the first current converting elements; a second common heat sink plate which electrically connects the direct current electrodes of the second current converting elements with a lower voltage terminal of the power source and forms a principal surface of the second arm module; a plurality of second phase heat sink plates which, respectively, connect the alternating current electrodes of the second current converting elements with the multiphase terminals of the motor and forms another principal surface of the second arm module; a plurality of second phase connecting terminals which, respectively, extend from the second phase heat sink plates toward the second direction so as to protrude from the second phase heat sink plates, the second phase connecting terminals being, respectively, connected with the terminals of the motor; and a second common connecting terminal which is connected with the lower voltage terminal of the power source and extends from the second common heat sink plate toward the second direction so as to protrude from the second common heat sink plate, the second common connecting terminal being placed substantially at the same position as the first common connecting terminal along the first direction; and an intermediate cooling member with a cooling fluid channel which is disposed between the first and second arm modules, the cooling fluid channel extending along the first direction, a cooling fluid of the cooling fluid channel receiving heat generated in the first and second arm modules through the principal surfaces of the first and second arm modules facing each other; wherein each of the common connecting terminals extends from an end portion of the corresponding common heat sink plate placed at one end side along the first direction to be away from the phase connecting terminals of the phase heat sink plates of the corresponding arm module in the first direction.