Patent ID: 8872466
Filing Date: 2014-10-28
Classification: H02M,H02P

Abstract:
1. A synchronous-machine starting device for starting a synchronous machine that includes an armature to generate a rotating magnetic field and a rotor to generate a fixed magnetic field by being supplied with a field current, the synchronous-machine starting device comprising: an electric power conversion unit to convert supplied electric power into AC power to supply to the armature of said synchronous machine; an AC voltage detection unit to detect an AC voltage in the armature of said synchronous machine; a rotor position detection unit to detect a position of said rotor of said synchronous machine based on said AC voltage detected by said AC voltage detection unit; an electric power conversion control unit to control said electric power conversion unit based on the position of said rotor detected by said rotor position detection unit; and an abnormality detection unit to detect a rotation abnormality of said synchronous machine based on said AC voltage detected by said AC voltage detection unit after a supply of said field current to said rotor of said synchronous machine is started, wherein the AC voltage detection unit is to detect first, second, and third AC voltages of respective first, second, and third armatures of said synchronous machine, the rotor position detection unit is to detect the position of said rotor of said synchronous machine based on said first, second, and third AC voltages detected by said AC voltage detection unit, the rotor position detection unit includes a cross detection unit to perform cross point detection, for each of the first, second and third armatures based on the first, second and third AC voltages, to detect a timing of cross points, the cross points occurring when each of the first, second and third AC voltages attains a predetermined voltage value, and the abnormality detection unit is to detect the rotation abnormality of said synchronous machine based on a detection signal from the rotor position detection unit that indicates the cross points.