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US 6,232,737 B1Granted
Method of detecting, diagnosing and automatically correcting abnormalities in servo control system
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMitsuyasu Kachi, Kazuhiko Tsutsui
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Abstract
According to the present invention, in a first acceleration after power is turned ON, currents flowing through U-phase and V-phase of a servo motor output terminal are detected, and misconnection of the motor output terminal is detected by monitoring a pattern of the current wave form.
Claims3
A method of automatically correcting abnormalities in a servo control system comprising the step of:
- reducing a positional loop gain only during a period in which a current command value has reached a current limit value during fast feed.
A method of automatically correcting abnormalities in a servo control system comprising the step of:
- reducing a positional loop gain by a specified time constant only during a period in which a current command value has reached a current limit value during fast feed.
A method of automatically correcting abnormalities in a servo control system comprising the step of:
- computing a positional loop gain from a current droop rate when a command concerning speed indicates a rated rotational speed of a motor and a current command value has reached a current limit value during fast feed;
- and
- controlling so that said command concerning speed will not exceed the rated rotational speed of said motor.
Dependencies are inferred from the claim text.