ABNORMALITY DETERMINATION DEVICE, ABNORMALITY DETERMINATION METHOD, AND PROGRAM

To provide a technology to more appropriately execute determination on an abnormality in a machine element of a rotary machine.SOLUTION: A control device 40 of the present invention includes an abnormality determination part 403 for executing determination on an abnormality in a machine element of a compressor 10 on the basis of an electric feature amount of the compressor 10 electrically driven by an electric motor 20. The electric feature amount is a specific frequency component of a signal indicating a physical amount having correlation with an electric current of the electric motor 20 for driving the compressor 10. The specific frequency component is a component of a predetermined positive integer multiple of a rotational frequency of the compressor 10. The abnormality determination part 403 executes determination on the abnormality in the machine element of the compressor 10 in consideration of variation in relationships between the abnormality in the machine element and the electric feature amount of the compressor 10 (electric motor 20) due to change in the rotational frequency of the compressor 10.SELECTED DRAWING: Figure 2 【課題】回転機械の機械要素の異常に関する判断をより適切に行うことが可能な技術を提供する。【解決手段】本開示の一実施形態に係る制御装置４０は、電動機２０により電気駆動される圧縮機１０の電気的特徴量に基づき、圧縮機１０の機械要素の異常に関する判断を行う異常判断部４０３を備え、電気的特徴量は、圧縮機１０を駆動する電動機２０の電流と相関のある物理量を表す信号の特定の周波数成分であり、特定の周波数成分は、圧縮機１０の回転周波数の所定の正の整数倍の成分であり、異常判断部４０３は、圧縮機１０の回転周波数の変化による、機械要素の異常と圧縮機１０（電動機２０）の電気的特徴量との関係の変動を考慮して、圧縮機１０の機械要素の異常に関する判断を行う。【選択図】図２