Patent ID: 8045301
Filing Date: 2011-10-25
Classification: B60L,H02M,H02P

Abstract:
1. A motor drive device, comprising: a three-phase AC motor; a power source capable of supplying DC power to first and second power supply lines; a power converting device performing power conversion between said first and second power lines and said three-phase AC motor; and a controller controlling said power converting device such that an output of said three-phase AC motor attains to a target output; wherein said three-phase AC motor has coils of the first to third phases electrically connected, said power converting device includes first to third circuits connected to coils of first to third phases, respectively, of said three-phase AC motor; each of said first to third circuits has first and second switching elements connected in series a connection node to the coil of respective phase of said three-phase AC motor; and said controller includes a short-circuit detecting unit detecting a switching element failed because of short-circuit, from said first to third circuits, and a motor drive control unit causing, in response to detection of a short-circuited switching element by said short-circuit detecting unit, switching operation of at least one switching element belonging to a circuit different from the circuit to which said short-circuited switching element belongs and arranged, in positional relation, opposite to said short-circuited switching element with said connecting node of each of said first to third circuits interposed, and stopping switching operation of remaining switching element, thereby controlling current flowing through coils of respective phases of said three-phase AC motor.