Electricity: motive power systems – Positional servo systems
Reexamination Certificate
2011-03-29
2011-03-29
Benson, Walter (Department: 2837)
Electricity: motive power systems
Positional servo systems
C318S632000, C318S638000, C700S193000
Reexamination Certificate
active
07915848
ABSTRACT:
A servo control apparatus that performs dual-position feedback control and thereby achieves a reduction in position error according to the purpose of machining. The servo control apparatus includes: a first position detector for detecting the position of a motor; a second position detector for detecting the position of a driven load; a first position error calculator for calculating a first position error based on a position command and motor position feedback; a second position error calculator for calculating a second position error based on the position command and driven load position feedback; a third position error calculator for calculating a third position error to be used for position control, by adding to the first position error a difference taken between the first position error and the second position error and passed through a time constant circuit; a selector for selecting either the second position error or the third position error for output; and a learning controller for learning an output of the selector, and for outputting an amount of compensation to be applied to the third position error.
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Japanese Notice of Reasons for Rejection mailed Jun. 22, 2010 issued in Japanese Application No. 2009-122252 (including translation thereof).
Iwashita Yasusuke
Maeda Kazuomi
Okita Tadashi
Toyozawa Yukio
Benson Walter
Colon-Santana Eduardo
Drinker Biddle & Reath LLP
Fanuc Ltd
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