Design Of Dynamic Wireless Power Supply System For Mine Monorail Crane

With the continuous development of the concept of green smart mines,higher requirements have been put forward for the safe use of electricity for underground electrical equipment in high gas dust.At present,there are three main types of energy supply methods for underground power equipment,namely,power supply via pantograph wire contact,diesel engine power supply,and battery power supply.Monorail cranes have been widely used in coal mining transportation systems at home and abroad for their advantages of strong traction and high work efficiency.For monorail cranes,the use of contact power supply will cause sparks or even explosions due to the contact of the wires;the use of diesel power supply is likely to pollute the environment,and the diesel is non-renewable and non-green;the use of batteries will be limited by the battery capacity and cannot be carried out.Long-distance construction operations.In order to solve the above problems,this article proposes the application of dynamic wireless power supply technology to the monorail crane system,which can not only avoid the safety problems caused by contact power supply,but also overcome the problem of insufficient cruising range caused by non-renewable diesel energy and battery power supply,and can reduce the demand for on-board battery capacity,and improve the convenience of power supply.Aiming at the design of the underground monorail crane wireless power supply system,the specific research work of this article is as follows: First,analyze and compare the coupling mechanism,the core of the transmission energy of the underground monorail crane wireless power supply system,and establish the magnetic circuit model of the coupling mechanism.The amount of magnetic core,actual installation environment constraints and coil winding design are designed from multiple angles,and a coupling mechanism structure suitable for the practical application of the wireless power supply system of monorail cranes in underground mines is proposed.Secondly,from the perspectives of selecting the operating frequency,reducing coil and magnetic core consumables,reducing capacitor and inductor voltage and current stress,and improving the coupling performance of the system,the coupling mechanism was optimized and the coupling mechanism with a transmission power of 20 k W was designed.From the perspective of reducing electromagnetic radiation and ensuring the personal safety of the staff in the monorail crane,the electromagnetic shielding structure of the monorail crane power supply system is designed to make the electromagnetic environment of the staff lower than the international standard threshold.Subsequently,the power supply circuit of the wireless power supply system was designed,the structure of the transmitting source and the receiving end converter,and the compensation circuit form used were determined.In response to the constant current charging requirements of the battery load,a reasonable control scheme was designed and verified by simulation.For the loss of each part of the system,analysis and calculation are carried out in order to evaluate the system design scheme.Finally,a prototype of the dynamic wireless power supply system of a monorail crane was built.On the experimental platform,a dynamic wireless power supply of 1k W under the system frequency of 85 k Hz was realized,and the efficiency of the magnetic coupling mechanism was 93%.At the same time,the system realized closed-loop control to control the battery charging current to be constant.When the system is moving,the output power fluctuation is only 2.43%,and the experimental results verify the correctness of the design scheme in this paper.