Practical Implementation of Secondary Control Principles in an Electro-Hydraulic Speed-Variable Drive Applied to an Injection Moulding Machine

Rasmus Aagaard Hertz, Ole Therkelsen, Søren Kristianen, Jesper Kjærsgaard Christensen, Christian-Emil Helver, Lasse Schmidt

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Abstract

In this work, a hydraulic state of the art injection molding machine is retrofitted with a dual pump drive. The dual pump drive is an electro-hydraulic speed-variable drive, with focus on high bandwidth control through secondary control principles. Secondary control is based on providing the torque references for the electric machines directly, instead of a speed reference. The pressure control loop is based on decoupling of the piston load pressure and sum pressure enabling the possibility to utilize two SISO controllers. The application is the injection cylinder of an industrial injection molding machine, retrofitted with the designed dual pump drive. Experimental results for the proposed secondary control structure are presented and difficulties of implementation are documented, and a large gap between the theoretical achievable bandwidth and the experimental achievable bandwidth is shown. Three possible reasons for this gap are identified, namely amplification of high frequency components from e.g. signal noise on sensors, the use of axial piston pumps which induce pressure pulsations and the influence of the discrete sample time of the digital controller hardware. Lastly future work within the field is considered, including possible methods to minimize the influence of the identified issues.
OriginalsprogEngelsk
TitelProceedings of ASME/BATH 2023 Symposium on Fluid Power and Motion Control, FPMC 2023
Antal sider9
ForlagAmerican Society of Mechanical Engineers
Publikationsdatookt. 2023
Sider1-9
Artikelnummerv001t01a057
ISBN (Elektronisk)978-0-7918-8743-1
DOI
StatusUdgivet - okt. 2023
Begivenhed2023 ASME/BATH Symposium on Fluid Power and Motion Control - Lido Beach Resort, Sarasota, Florida, USA
Varighed: 16 okt. 202318 okt. 2023
https://event.asme.org/FPMC

Konference

Konference2023 ASME/BATH Symposium on Fluid Power and Motion Control
LokationLido Beach Resort
Land/OmrådeUSA
BySarasota, Florida
Periode16/10/202318/10/2023
Internetadresse

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