Modelling of an Electrohydraulic Proportional Valve with a Synchronous Motor

This paper presents the design of proportional valve with a Permanent Magnet Synchronous Motor (PMSM). The proposed valve is described, and its history is briefly reviewed. Basic equations describing the valve are formulated and its simulation model is implemented in MATLAB-Simulink software. Selected nonlinearities are included in this model. In order to determine the basic parameters of the discussed proportional valve, a test stand is built, which enables valve investigations. In this test stand, a valve control system based on programmable logic controller (PLC) with a touch panel and inverter module is implemented and used for investigations. The valve flow characteristics and step responses obtained in simulations are presented. These characteristics are compared with results obtained in experimental investigations. As a result, the valve simulation model is modified and improved.