US 7,248,014 B2 · Motor control system

Abstract

A motor control system capable of securing stability and rapidity of motion even in a machine where the stability varies in accordance with a position of a driven member. The driven member and a motor for driving the driven member are operatively connected through a transmission mechanism including a nonlinear element such that a rate of change of the position of the driven member with respect to the position of the motor varies in dependence on the position of the motor. Optimum values of multiplier factors of operation constants with respect to the position of the driven member or the rotational position of the motor for the position control and the velocity control are stored in a data table. The values of the multiplier factors of the operation constants for a present position of the driven member or a present position of the motor are determined using the data table and the determined values of the multiplier factors are multiplied by reference operation constants to update the operation constants. The position and/or velocity control processing is performed using the updated optimum operation constants in accordance with the present position of the driven member or the present rotational position of the motor.

Claims23

Dependent claims

A motor control system for controlling a servomotor for driving a driven member through a transmission mechanism for mechanically connecting the servomotor and the driven member, comprising:

a servo controller having a position control section for performing position control processing for feedback controlling a position of the driven member, and a velocity control section for performing velocity control processing for feedback controlling a velocity of the driven member;
a host controller for issuing a position command commanding a position of the driven member to said servo controller, and outputting information on operation constants for the position control processing by the position control section and/or the velocity control processing by the velocity control section, to be corresponding to the commanded position;
and
operation constant varying unit for varying operation constants for the position control processing and/or the velocity control processing in accordance with the information on the operation constants outputted from said host controller,
wherein the driven member comprises a mold of an electric press machine for performing a press work, and the operation constants have different values in the vicinity of a bottom dead point where the press work is performed and in the vicinity of a top dead point where the press work is not performed.

2 more elements

Dependencies are inferred from the claim text.

Motor control system

Life of this patent

Motor control system

Life of this patent

Abstract

Claims23