Servo motor control unit for press-forming machine

Details Servo motor control unit for press-forming machine Servo motor control unit for press-forming machine

2006-05-23

2006-05-23

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Positional servo systems

With protective or reliability increasing features

C318S609000, C318S632000

Reexamination Certificate

active

07049775

ABSTRACT:
A servo motor for driving a die is provided with position and speed detectors. Further, a pressure sensor for detecting the pressure applied to a workpiece is provided. In the servo motor control unit, the smaller one of the speed command obtained by feedback control of the position and the speed command obtained by the pressure feedback control is selected as an output of a comparator. Based on the speed command output from the comparator, feedback control of the speed is performed and the servo motor is driven. In the state where the die does not press against the workpiece, a pressure error is large, the speed command by pressure control becomes large, and the speed command by position control becomes small. Therefore, position control is performed. When the workpiece is pressed, the position error increases, and the pressure error decreases, a speed command by pressure control is employed and pressure control is performed.

REFERENCES:
patent: 4011493 (1977-03-01), Fukase et al.
patent: 5552690 (1996-09-01), Hiraoka
patent: 5997780 (1999-12-01), Ito et al.

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