Title :
Reaction Force Estimation for Injection Unit by Disturbance Observer
Author :
Ochi, Kiyoshi ; Saeki, Masami
Author_Institution :
Process Control Group Molding Machinery Design Eng. Dept., Japan Steel Works Ltd., Hiroshima
Abstract :
A force sensor is a very important element of the injection molding machines, because the injection pressure detected by the force sensor is especially important in the injection process. Therefore, such a fault detection method that is independent of the sensor is required. In this paper, an estimation method of reaction force is proposed for the drive system of the injection unit composed of a servo motor and a ball screw. We use a disturbance observer, and its structure is determined for the two-mass damper model. We construct a simplified low dimensional observer and its coefficients are identified from experimental data by the least square method
Keywords :
differentiation; fault diagnosis; feedback; force sensors; injection moulding; least squares approximations; observers; plastics industry; vibration control; approximate differentiation method; ball screw; disturbance observer; fault detection method; force sensor; injection molding machine; injection unit drive system; least square method; reaction force estimation; servo motor; two-mass damper model; Damping; Fasteners; Fault detection; Force measurement; Force sensors; Injection molding; Pressure measurement; Servomechanisms; Servomotors; Shock absorbers; Disturbance observer; Identification; Injection unit;
Conference_Titel :
SICE-ICASE, 2006. International Joint Conference
Conference_Location :
Busan
Print_ISBN :
89-950038-4-7
Electronic_ISBN :
89-950038-5-5
DOI :
10.1109/SICE.2006.315029
