| 摘要 |
PROBLEM TO BE SOLVED: To provide a method, in which the abnormality caused by the abrasion or the deterioration due to aging of a machine is diagnosed, without using an dedicated exciting unit. SOLUTION: A command, which periodically changes the rotational speed or the torque of an electric motor 2, is given to the electric motor 2, the speed or the torque of the electric motor 2 is periodically changed, the machine 3 is excited, the response speed or the response acceleration of the machine 3 due to its excitation is measured, and the abnormality of the machine is diagnosed, while the response speed or the response acceleration is used as a reference.
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