Patent ID: 8884567
Filing Date: 2014-11-11
Classification: H02P

Abstract:
1. A system for controlling a rotary machine, the system comprising: a circuit configured to output an AC (Alternating Current) voltage to be applied to the rotary machine; a measuring unit configured to measure a rotational angle of the rotary machine; a storage configured to store therein measurement-error information indicative of a measurement error of the measuring unit; a torque-feedback adjuster configured to manipulate a phase of the output voltage of the circuit based on the rotational angle of the rotary machine measured by the measuring unit and the measurement-error information to adjust a torque of the rotary machine to a request torque for the rotary machine, the phase being obtained from information fed back from the rotary machine; an abnormality determiner configured to determine whether there is an abnormality using the measurement-error information stored in the storage according to at least one of: comparison of the measurement-error information stored in the storage with a preset value; and an error detection code if the error detection code is included in the measurement-error information stored in the storage; and a limiter configured to limit adjustment of the torque of the rotary machine to the request torque by the torque-feedback adjuster when it is determined that there is an abnormality using the measurement-error information stored in the storage, wherein, when it is determined that there is the abnormality using the measurement-error information stored in the storage, the limiter is configured to perform one of: switching from an operation of the torque-feedback adjuster to an operation that adjusts a current actually flowing in the rotary machine to a command current, the current actually flowing in the rotary machine being associated with the torque of the rotary machine, the command current is set based on the request torque and the information fed back from the rotary machine; reducing a phase manipulatable range defined from an upper limit in a phase-lead direction to a lower limit in a phase-retard direction, the torque-feedback adjuster being configured to manipulate the phase of the output voltage of the circuit within the phase manipulatable range; and limiting an absolute value of the request torque.