Dynamic characteristics of scraper conveyor with direct-driven permanent magnet synchronous motor under impact load

Abstract

To simulate the dynamic characteristics of a permanent magnet direct-drive scraper conveyor (SC) (PMDD-SC) under impact load, a dynamics model is constructed based on the Kelvin–Voigt theory through AMESim, and the vector control of permanent magnet synchronous motor (PMSM) is carried out with id = 0 through MATLAB/Simulink. Based on the dynamic equations of the SC and the torque equations of the PMSM, the torque expression of the motor was derived and used as the system output. At the same time, the sprocket speed was used as the system's feedback, and the electromechanical coupling model of PMDD-SC was established through the co-simulation of the two software. The dynamic characteristics of PMDD-SC under unsteady coal fall, stuck chain, and broken chain were analyzed. Specifically, the tension and speed of the chain and the key point, as well as the torque, speed, and U-phase current of the motor at the head and tail of the machine were simulated at different positions and times under the above three working conditions. The results show that the maximum tension on the loaded side is 2.79 × 10⁵ N and 8.35 × 10⁵ N for the unsteady coal fall and the stuck chain, respectively. The peak currents of the unsteady coal fall and the blocking current of the stuck chain were about 340 A and 700 A, respectively. The chain tension will be 0 rapidly after chain breakage, and the head current fluctuates drastically and then tends to stabilize. The characteristics of SC tension and speed are the same. The permanent magnet direct-drive system responds quickly to the load change, and the larger load change has a greater impact on the stability of the drive system.