| In recent years,China has accelerated the construction of intelligent coal mine,but the intelligent degree of mine transportation equipment is still low,which has become a weak link restricting the development of intelligent coal mine.As one of the main transport equipment in coal mine,belt conveyor is mainly driven by asynchronous motor and tensioned by hydraulic winch.There are some problems,such as low transmission efficiency,difficult operation and maintenance,slow response speed of tension and so on.It not only affects the mining efficiency and output of coal,but also restricts the development of intelligent coal mine.Permanent magnet synchronous motor can realize the direct drive of low speed and high torque load,which has the outstanding advantages of high efficiency and energy saving.The transformation of permanent magnet driving for belt conveyor has become an important direction of intelligent transportation in coal mine.In this paper,combined with permanent magnet driving and intelligent control technology,a kind of all permanent magnet driving belt conveyor is designed,which integrates permanent magnet direct driving system and permanent magnet tensioning device.The research results are of great theoretical and practical significance to improve the driving efficiency,the speed of tension response and the coordination and controllability of the whole machine,so as to realize the intelligent driving and dynamic tensioning of the belt conveyor and promote the intelligent development of mine transportation.Taking the belt conveyor as the research object,this paper analyzes and verifies the electromechanical coupling dynamics behavior of the all permanent magnet driving belt conveyor by combining theoretical analysis and calculation,computer simulation analysis and field test.Firstly,taking the horizontal belt conveyor of a mine in Inner Mongolia as the object of all permanent magnet drive transformation,the design parameters of all permanent magnet driving system are determined by calculating the running resistance,belt tension and its tension;The all permanent magnet driving system is built by using Belt Analyst software,and the rationality of the design parameters is verified.Secondly,in order to construct the vector control model of permanent magnet driving system,the double closed-loop vector control strategy of single driving motor,the master-slave control strategy of multi driving motor and the fuzzy PI parameter compensation control strategy of permanent magnet tensioning motor are designed;A variety of vector control models are built by using MATLAB/Simulink to verify the feasibility of the control strategy.Thirdly,the mechanical load dynamic model equation of the belt conveyor is deduced,and the electromechanical coupling dynamics model of the belt conveyor driven by permanent magnet is built by MATLAB/Simulink;On this basis,the electromechanical coupling dynamics behavior,motor dynamics characteristics and control strategy are simulated under multiple operating conditions.Finally,field test is carried out to verify the rationality of the design theory of all permanent magnet driving system.The results show that: the all permanent magnet driving belt conveyor can respond quickly and adjust dynamically under zero speed heavy load starting,load mutation operation and other working conditions,maintaining good dynamic characteristics and antiinterference;The results show that power balance can be achieved among multiple motors,and the tension force can be dynamically adjusted by the permanent magnet tensioning device;the dynamics characteristics of the motor obtained from the electromechanical coupling dynamics behavior simulation test of the whole system are basically consistent with those obtained from the field test,and the results have certain guiding significance;The economic benefit analysis shows that the all permanent magnet driving belt conveyor can save about 24.6% of electricity annually and increase output by about 135 million yuan. |
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