Patent ID: 7642739
Filing Date: 2010-01-05
Classification: G05B,H02P

Abstract:
1. A motor control device comprising: a motor that drives a plant, a speed detection unit that detects a traveling speed of the plant, a speed control unit that determines a manipulated variable for operating the motor based on an error between a detection speed detected by the speed detection unit and a given target speed, a position detection unit that detects a position of the plant, a position control unit that determines a manipulated variable based on an error between a detection position detected by the position detection unit and a target position directed from outside; and a direction correction unit that corrects directions to the speed control unit based on the manipulated variable determined by the position control unit; and a speed direction unit that directs the speed control unit to spend a predetermined time to vary the manipulated variable corresponding to the speed of the plant, from the manipulated variable corresponding to an initial speed of the plant lower than the target speed to the manipulated variable corresponding to the target speed, wherein the direction correction unit directs the target speed to the speed control unit when the manipulated variable determined by the position control unit is a manipulated variable corresponding to or above the target speed and the direction correction unit directs the manipulated variable determined by the position control unit to the speed control unit when the manipulated variable is a manipulated variable corresponding to a speed below the target speed, and wherein the position control unit determines a manipulated variable directed to the speed control unit by a proportional control based on an error between the detection position and the target position.