Electromechanical coupling dynamics behavior of permanent magnet motor semi-direct driving scraper conveyor

Aiming at the problems of low transmission efficiency and high energy consumption of the traditional induction motor drive system of the scraper conveyor, and the radial size of the permanent magnet direct driving system which is too large and difficult to be installed in the downhole working face, a new type of semi-direct driving system of permanent magnet motors is designed, and the electromechanical coupling dynamics behavior of the semi-direct drive scraper conveyor of permanent magnet is investigated by using the simulation software of MATLAB/Simulink and the test of the bench. First, a semi-direct driving system based on permanent magnet drive technology was designed using the SGZ1000/2000 type scraper conveyor as an example, and the key parameters of the drive system were designed. Then, the dynamic model of the gear transmission system was derived, and a simulation model of the electromechanical coupling dynamics of the permanent magnet motor semi-direct driving scraper conveyor was built based on the state space equation modelling method. On this basis, the electromechanical coupling dynamics behavior of the permanent magnet motor semi-direct driving scraper conveyor under various working conditions was investigated through simulation experiments. The results show that the semi-direct driving system of the permanent magnet motor could realize no-load and heavy-duty operation, fast response of output speed and electromagnetic torque, and dynamic adjustment under the three working conditions of no-load start of constant coal drop, non-constant coal drop, and full-load start after failure; At the moment of starting and under the sudden change of load, the chain speed, acceleration and tension fluctuate significantly, among which the fluctuation peaks are largest in the sprockets of the head and tail; as the fluctuation peaks of the chain transmission decay, the farther away from the head and tail sprockets, the smaller the fluctuation peaks. The fluctuation peaks are attenuated as the chain passes, and the farther away from the head and tail sprockets, the smaller the fluctuation peaks are. Again, using the permanent magnet motor semi-direct driving system test bench, the simulation test of no-load start-up coal drop and full-load start-up is carried out to obtain the dynamic characteristics of the permanent magnet motor semi-direct driving system, and the test results are basically consistent with the simulation results of the electromechanical coupling dynamics model. Finally, based on the experimental performance parameters obtained from the permanent magnet motor semi-direct driving system test bench, after comparing the output torque, electromagnetic torque and other driving performance of the permanent magnet motor semi-direct drive system and the traditional induction motor drive system, we could see that the driving efficiency of the permanent magnet motor semi-direct driving system is better than that of the traditional induction motor driving system at the full load point, which is at least more than 16.3%, which could significantly improve the power saving rate of mine transportation equipment and help promote the development of mining in the green and low-carbon direction. It can significantly improve the power saving rate of mine haulage equipment and help promote the development of mines in the green and low-carbon direction.