Analysis of Field Oriented Control of Permanent Magnet Synchronous Motor for valveless pump-controlled actuator

Earlier research demonstrated that a pump-controlled hydraulic system combines the best properties of traditional hydraulics and electric intelligence. Thus, the new system has been proposed as a replacement for conventional valve-controlled systems, to improve the energy efficiency in non-road mobile machinery in particularly. Such pump-controlled system can be realized via direct control of hydraulic pump/motor by varying speed of prime mover. Electric motors have higher efficiency in comparison with Combustion Camera Diesel Engines also less power consumption and local pollutions. These advantages allow to improve the system efficiency and decrease the energy expenses. A Permanent Magnet Synchronous Motor (PMSM) is the one of the most attractive option of electric motor due to its size, power, and efficiency. The efficiency of the electric motor can be increased by using vector control systems, which provide rotor magnetic flux control, which is proportional to the shafts speed. Considering all vector control’s benefits (high accuracy of speed control, smooth start and smooth rotation of the motor in the entire frequency range, quick response to load changes, increased control range and accuracy of regulation), the electrohydraulic systems and influence of electric part on hydraulic one is not investigated enough. One of the most perspective vector control systems is Field Oriented Control (FOC) is studied in this paper. The model of PMSM control system, which is built in MATLAB/Simulink, consists of frequency converter with Pulse Width Modulation (PWM) controller, reverse Park transformation, speed controller, saturation block, cross-link compensator, reference current and torque. In this study, a fixed displacement hydraulic pump is connected to a single-rod cylinder. Additional load connected to cylinder is changing bring the simulation closer to real conditions. A behavior of the systems was investigated by transient processes analysis (response time, overshooting, transient process time etc.) of electric motor, pump and cylinder.