US 7,144,238 B2Granted

Servo motor control apparatus for electric injection molding machine

AssigneeIndustrial Technology Research Institute

InventorChin-Yu Chao

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Abstract

A servo motor control apparatus comprises a motion control unit for generating a position command; a first drive amplifier connecting with the motion control unit, for receiving the command to drive a first servo motor, and forming a first position control loop together with the motion control unit and the first servo motor; and at least one second drive amplifier connecting with the motion control unit, for receiving the command to drive at least one second servo motor, and forming a second position control loop together with the motion control unit and the second servo motor. The motion control unit comprises at least one synchronous controller, which receives and performs calculations to a difference value between position errors of the first and second position control loops for serving as speed and torque feed forward compensations to keep said second servo motor synchronous with the first servo motor.

Claims11

Dependent claims

A servo motor control apparatus for electric injection molding machine, comprising:

a motion control unit, for generating a speed command;
a first drive amplifier connected to the motion control unit, for receiving the speed command of the motion control unit to drive a first servo motor, allowing the first drive amplifier, the motion control unit and the first servo motor to cooperatively form a first position control loop;
and
at least one second drive amplifier connected to the motion control unit, for receiving the speed command of the motion control unit to drive at least one second servo motor, allowing the second drive amplifier, the motion control unit and said second servo motor to cooperatively form a second position control loop;
wherein the motion control unit comprises at least one synchronous controller for producing a speed feed forward compensation and a torque feed forward compensation obtained from a difference between a position error of the first position control loop and a position error of the second position control loop, allowing the synchronous controller to use the speed feed forward compensation and a torque feed forward compensation to adjust the second servo motor and to keep the second servo motor synchronous in rotation speed with the first servo motor.

2 more elements

Dependencies are inferred from the claim text.