Research On Power Balance Method Of Belt Conveyor

With the increasing demand for energy,belt conveyor as one of the ideal conveying equipment for transporting bulk materials.Because of its compact structure and high efficiency and strong adaptability to the environment,it is increasingly being designed and put into use in important industries such as coal mines and other national economic pillars.In order to reduce losses and improve production operation efficiency,most companies start to drive with dual or multiple motors.Considering the narrow space of the underground coal mine and the limitation of motor performance,therefore,it is more suitable to use dual motor synchronous drive.Due to the difference in manufacturing process,the mechanical characteristics of each motor cannot be completely consistent.When two motors act on the same working mechanism and simultaneously drag the same load,it often causes one motor to be overloaded and the other motor to be lightly loaded.That is to say,power balance cannot be achieved,which will affect normal production and even cause damage to electrical equipment.Therefore,it is of practical significance to study the power balance problem of the dual-machine drive of the mining belt conveyor system.In this thesis,I borrowed a lot of literature materials for this problem and conducted in-depth research.Firstly,the research object of the thesis was established as an AC asynchronous motor,Introduced the mathematical model of asynchronous motor and introduced knowledge about vector control,analyzed the problem of ideal distribution and actual distribution between drive motors,dynamic and static factors that lead to power imbalance.Then through research and analysis of the advantages and disadvantages of several main strategies commonly used to control power balance systems,based on asynchronous motor vector control model determined the control structure and strategy of power balance in this thesis.The whole system adopts the master-slave control scheme of speed closed loop,flux linkage closed loop,flux linkage current closed loop and torque current closed loop control mode to achieve the purpose of synchronously adjusting power balance.At the same time,in order to ensure the system's good control accuracy and make up for the shortcoming of traditional PID control algorithms,in this thesis,the composite control algorithm combining the fuzzy intelligent control and PID control is further applied to the speed loop controller and the torque current loop controller.At last,according to the above theoretical analysis,based on MATLAB/Simulink simulation platform,Built a single asynchronous motor vector control model,verification of the correctness of the model and the superiority of the composite controller,Then the simulation model of the dual-motor synchronous drive power balance control system is built.theoretical analysis and simulation results show that the proposed power balance strategy enables the motor to achieve better control performance.Effectively verify that this method can achieve the problem that the load between the two motors is close to the ideal distribution direction,and increased belt conveyor efficiency.