| 摘要 |
Provided is an AC rotating machine control device for reducing reverse torque at the time of shifting to sensorless control using an estimated rotational position or preventing failure of an AC rotating machine and a drive circuit for the AC rotating machine due to overcurrent. This AC rotating machine control device includes: rotational position estimation means 9 for calculating an estimated rotational position of the AC rotating machine 1 when a rotational position sensor 2 is determined to be abnormal; power limiting means 6 for limiting drive power supplied for driving the AC rotating machine; and power feed means 10 for, when sensor abnormality determination means 3 determines that the rotational position sensor is abnormal, on the basis of the estimated rotational position, supplying the AC rotating machine with power obtained by adding rotational position estimation power supplied for the rotational position estimation means to estimate the rotational position, to the drive power limited by the power limiting means, wherein the power limiting means 6 limits drive current at least during a predetermined period since the sensor abnormality determination means 3 determines that the abnormality occurs until estimated error of the estimated rotational position falls within a predetermined range. |
