Method and apparatus for AC servo motor control

Details Method and apparatus for AC servo motor control Method and apparatus for AC servo motor control

1997-07-07

1998-07-14

Martin, David S.

Electricity: motive power systems

Positional servo systems

With compensating features

31856822, 318606, 318798, 318807, G05D 23275

Patent

active

057809895

ABSTRACT:
The present invention relates to an AC servo motor control is disclosed, in which a voltage command is produced from the deviation between a current command and feedback current for the AC servo motor control according to the voltage command thus produced. Whenever the voltage command becomes zero, feedback-current data is collected for a predetermined period of time. Offset amount is calculated for updating according to the collected feedback-current data. Subsequently, the feedback current is corrected by using the new offset amplitude during revolution of the AC servo motor. A voltage command to the AC servo motor is produced according to the deviation between the current command and the compensated feedback current.

REFERENCES:
patent: 3705400 (1972-12-01), Cordes
patent: 4458322 (1984-07-01), Veale
patent: 5293102 (1994-03-01), Martinon et al.
patent: 5319294 (1994-06-01), Ohto et al.

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