Electricity: motive power systems – Positional servo systems – Plural servomotors
Reexamination Certificate
2011-03-29
2011-03-29
Benson, Walter (Department: 2837)
Electricity: motive power systems
Positional servo systems
Plural servomotors
C318S568220, C318S560000, C318S066000, C318S067000, C318S068000
Reexamination Certificate
active
07915850
ABSTRACT:
An apparatus and method for servomotors of an electric injection molding machine includes a motion controlling unit, two driving amplifying units, and two servomotors respectively connected to the driving amplifying units. The motion controlling unit includes two servomotor position controllers both for receiving a first position command, and the driving amplifying units are respectively connected to the servomotor position controllers for receiving a second and third position command. Two position detectors are respectively received in the two screw caps that are mounted to the servomotors for detecting absolute positions of the corresponding screw caps. The screw caps are respectively connected to inputs of the first and second servomotor position controllers to form two screw cap position feedback circuits. The values of the screw cap position feedback circuits are compared to the first position command for being input into the driving amplifying units to drive the corresponding servomotors to act synchronously.
REFERENCES:
patent: 5362222 (1994-11-01), Faig et al.
patent: 6046566 (2000-04-01), Sonoda et al.
patent: 6142760 (2000-11-01), Niizeki et al.
patent: 7144238 (2006-12-01), Chao
Horng Rong-Hwang
Lai Yaw-Shen
Liu Hsing-Chang
Ting Chin-Hsien
Benson Walter
Bonderer D. Austin
Foxnum Technology Co., Ltd.
Luo David S
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