公开(公告)号：US20200150156A1

公开(公告)日：2020-05-14

申请号：US16676852

申请日：2019-11-07

Applicant: Hitachi, Ltd.

Inventor： Kazuo ONO ,  Kouji MATSUDA ,  Takuma NISHIMURA

IPC: G01R19/145 ,  G01R19/25 ,  G01M15/02

Abstract: A rotary tool diagnosis system according to one aspect of the present invention includes a first current detector, a second current detector, and a signal processing device. The first current detector detects a current of at least one power line connected to a first electric motor that rotates a rotary tool. The second current detector detects a current of at least one power line connected to a second electric motor that is used for moving the rotary tool. The signal processing device triggers based on a result of processing on an output signal of the second current detector and starts recording of an output signal from the first current detector.