Backlash correction apparatus and method of numerical controller

Details Backlash correction apparatus and method of numerical controller Backlash correction apparatus and method of numerical controller

1996-07-10

1998-06-16

Masih, Karen

Electricity: motive power systems

Positional servo systems

318280, 318600, 318630, 318567, 31856822, 318569, G05B 1101

Patent

active

057676453

ABSTRACT:
A backlash correction apparatus and method thereof for a numerical controller, which apparatus includes a command direction memory unit for storing a direction value of a position command, a feedback velocity/direction memory unit for storing a present transfer direction value, a previous direction memory unit for storing a previous transfer direction value, a reverse direction detector for operating on the command direction value, the previous transfer direction value and the present transfer direction and outputting therefrom a correction direction value, a backlash data memory unit for storing a backlash error value corresponding to the pitch position of a ball screw for transferring a table, a correction data operator for reading from the backlash data memory unit backlash errors and outputting therefrom backlash correction values by adding to the read backlash errors the correction direction values, and a correction data output unit for outputting the backlash correction values applied thereto from the correction data operator to a position controller, the apparatus enables enhancing the precision of the position controller by correcting backlash error according to the transfer position value as well as the variation of the command direction value.

REFERENCES:
patent: 4961034 (1990-10-01), Kakino et al.
patent: 5059881 (1991-10-01), Fujita et al.
patent: 5343132 (1994-08-01), Iwashita

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