Research On Power Balance Of Belt Conveyor Based On Permanent Magnet Motor

With the rapid development of China’s economy,the demand for energy has increased year by year.As the main equipment of the coal mine transportation system,the belt conveyor needs to have large-capacity,long-distance,and high-speed transportation capabilities.Therefore,the form of dual motor drive is widely used.However,with the increase of the number of driving motors,the difficulty of cooperative driving also increases accordingly,and the driving force is unbalanced,which will damage the motor in severe cases.And at present,the conveyor generally adopts the form of "asynchronous motor＋reducer" to achieve low speed and high torque drive.There are many driving links,which leads to the low overall efficiency of the driving system,which increases the probability of maintenance failures,which is not conducive to the normal production of the enterprise.To this end,a direct-drive system based on a low-speed and large-torque permanent magnet motor is designed in this paper,and its power balance control is studied.The main research work of the paper isThe structure of the permanent magnet motor is introduced,and the mathematical model of the permanent magnet synchronous motor is established based on the coordinate transformation.According to the working characteristics of the belt conveyor,the vector control strategy for the permanent magnet motor is determined,and the SVPWM modulation technology is analyzed and studied in detail.The corresponding control simulation model is established using MATLAB/Simulink so ftware.Perform belt conveyor dynamics analysis.Based on the finite element method,a mathematical model of the conveyor load was established,and further connected with the vector control model of the permanent magnet synchronous motor to obtain the electromechanical coupling model of the permanent magnet direct drive-belt conveyor.In addition,by comparing the speed and driving force of the two arrangements of dual-motor drive,the head-to-tail dual-drive arrangement and control scheme to be studied in this paper are determined.At the same time,the ideal "S" soft start is discussed and determined.curveBased on the complexity of time-delay,time-varying,and multi-variable control of the permanent magnet direct drive belt conveyor system,it was decided to adopt fuzzy PID control method.Based on this,a variable universe was proposed to address the defects of the fuzzy domain of control.Thoughts,adjust the discourse in real time based on input and output.Finally,with MATLAB/Simulink simulation,the results show that variable universe fuzzy PID control has better performance.The design of the electric control system of the permanent magnet direct drive system is given,including the selection of the main controller and the inverter,and the control program design.And through simulation,it shows that this method has the advantages of fast response speed,strong robustness,high power balance accuracy,etc.,and fully meets the requirements of multi-motor power balance control of belt conveyors.It also verifies the rationality and correctness of the electromechanical coupling model of the permanent magnet direct drive-belt conveyor system established in this paper.Figure 46 table 13 reference 107...