Characteristic Analysis of Different Permanent Magnet Synchronous Motor Control Schemes in the Lift Pump Control System for Electric Forklifts

With the advancement of electrification in construction machinery, pump control systems with higher efficiency in hydraulic systems attracts more attention. However, the pump-controlled hydraulic system is confronted with low responsiveness and unstable control. The pump control system's output performance is crucially influenced by the motor, which serves as its power unit. This study examines various control schemes for the permanent magnet synchronous motor (PMSM) in the lifting pump control system of an electric forklift. The different control schemes explored include vector control, active disturbance rejection control, direct current prediction control, PWM prediction control, two-step direct current prediction control, and three-step direct current prediction control. The comparisons are carried out through joint simulations using MATLAB/Simulink and AMESim. The dynamic output performance and static output performance of the PMSM are evaluated, along with their dynamic and static characteristics in the pump control system's output. The simulation results were used to identify the advantages and disadvantages of each control method, as well as their impacts on the pump control system. Moreover, the investigation conducted a comprehensive analysis of the influencing factors. Additionally, the direction of improvement for the pump control system's performance using model predictive control is proposed.