Abnormal state detecting apparatus of a machine tool

Details Abnormal state detecting apparatus of a machine tool Abnormal state detecting apparatus of a machine tool

1991-01-04

1992-08-25

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With protective or reliability increasing features

318563, 318571, 318475, 318275, 36447412, G05B 902

Patent

active

051422107

ABSTRACT:
An abnormal state detecting apparatus of a machine tool having a servomotor. The apparatus is provided with a device for detecting an abnormal acceleration and an abnormal torque of the servomotor and a device for detecting an abnormal operation state of the servomotor from the directions of the detected acceleration and torque. When the torque, acceleration and operation state are all abnormal, the machine tool is judged to be in an abnormal state and the servomotor is controlled, thereby protecting the machine tool from an impact in an abnormal operation state.

REFERENCES:
patent: 3728595 (1973-04-01), Adams
patent: 3733940 (1973-05-01), Harman et al.
patent: 4267914 (1981-05-01), Saar
patent: 4617635 (1986-10-01), Shimizu

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