ABNORMALITY DETERMINATION DEVICE, ABNORMALITY DETERMINATION METHOD, AND PROGRAM

Provide a technology that enables more appropriate determinations relating to the anomaly of a mechanical element in a rotating machine. The control device 40 according to an embodiment of the present disclosure includes the anomaly determining unit 403 configured to make a determination relating to an anomaly of a mechanical element of the compressor 10, based on an electrical feature amount of the compressor 10 that is electrically driven by the electric motor 20, wherein the electrical feature amount is a particular frequency component of a signal representing a physical amount that is correlated with a current of the electric motor 20 configured to drive the compressor 10, the particular frequency component is a predetermined positive integral multiple component of a rotational frequency of the compressor 10, and the anomaly determining unit 403 makes the determination relating to an anomaly of the mechanical element of the compressor 10, in consideration of a variation of a relationship between the anomaly of the mechanical element and the electrical feature amount of the compressor 10 (the electric motor 20), the variation being caused by a change in the rotational frequency of the compressor 10.