Relative position control in an electro-hydraulic forklift

The purpose of this research is to utilize the excellent control capabilities of modern electric drives in electro-hydraulic systems such as forklifts, create direct drive position control for the forklift fork and verify the results by measurements. The drive consists of a Direct Torque Control (DTC) electric servo motor directly running a reversible hydraulic pump. The position of a hydraulic cylinder is controlled by a Permanent Magnet Synchronous Machine (PMSM) drive with a single feedback from motor rotor angle resolver. A fairly accurate lifting height sensorless control could be used e.g. as a base for a new automatic warehouse system. The system equipped with e.g. a simple proximity switch should be able to serve as an automated height control system for a warehouse.

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