Back to results
US 7,659,681 B2Granted
Numerical controller
AssigneeFanuc Corporation
InventorsYasushi Onishi, Tetsuo Hishikawa, Keisuke Tsujikawa
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeFanuc Corporation
InventorsYasushi Onishi, Tetsuo Hishikawa, Keisuke Tsujikawa
Estimating the term…
A servomotor in a numerical controller is controlled by automatically switching to either pressure control or position control in association with the command which is smaller from among a command obtained by performing pressure feedback control and a command obtained by performing position feedback control. When switched to pressure control while moving according to a movement command, the output of the movement command is terminated halfway, and the command in the next block is executed, and pressure control of the next command is immediately started. As a result, a wasteful time is eliminated, and a cycle time of the operation can be shortened.
A numerical controller, including a servo control unit that controls a servo motor, and a numerical control unit that outputs a position command and a pressure command to said servo control unit based on a NC program,
A numerical control method of switching between a position control and a pressure control by a numerical controller which comprises a servo control unit comparing a command obtained by performing a feedback control of pressure with a command obtained by performing a feedback control of position and automatically switching a control to pressure control or position control based on the comparison result to control the servo motor, and a numerical control unit for outputting a position command and a pressure command to said servo control unit based on a NC program, wherein:
Dependencies are inferred from the claim text.