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US 6,140,789 AGranted
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.
Claims1
A method of automatically correcting abnormalities in a servo control system comprising the steps of:
- clamping a command concerning speed at a rated rotational speed of a motor;
- limiting a change rate of a command concerning position per unit time for preventing overshooting;
- and
- compensating for the limited change rate, by adjusting a time constant for deceleration from a point in time when deceleration is started.
1 more element
Dependencies are inferred from the claim text.