Title:
NUMERICAL CONTROLLER
Document Type and Number:
WIPO Patent Application WO/1988/004445
Kind Code:
A1
Abstract:
A numerical controller which reliably liberates the positional precision from the effect of static friction and dynamic friction applied as disturbance to the servo loop in the case when a servo system is constructed in the form of a semi-closed loop to numerically control a machine tool driven by a servo motor and to determine its position. The numerical controller has a backlash correction function and supplies the servo system with a backlash correction data (BL(i)) that is distinguished from the ordinary motion command (MC(i)). In response to the backlash correction data (BL(i)), an offset command that corresponds to a friction torque Fa in the mechanical system is given to the servo system as a torque correction signal (FR(i)).
Inventors:
KURAKAKE MITSUO (JP)
SAKAMOTO KEIJI (JP)
SAKAMOTO KEIJI (JP)
Application Number:
PCT/JP1987/000967
Publication Date:
June 16, 1988
Filing Date:
December 11, 1987
Export Citation:
Assignee:
FANUC LTD (JP)
International Classes:
G05D3/12; G05B19/404; G05D17/02; H02P29/00; (IPC1-7): G05D3/12
Foreign References:
| JPS60116004A | 1985-06-22 |
Other References:
See also references of EP 0292574A4
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