【作者】 丁娟；

【导师】 王松；

【作者基本信息】 山东大学 ， 电子与通信工程（专业学位）， 2023， 硕士

【摘要】 针对刮板运输机启动困难,保障煤炭开采的安全,开发了用于煤矿矿井提升机的变极式双速机。该电机是使用了两套不同磁极数的绕组线圈。通过在定子槽内选取两个极数不同的线圈,使电机的定子磁场极数发生变化,进而产生不同的转速和转矩特性,实现低速启动,高速运行,可有效地解决重负荷启动的难题,是一种高效的传动方法。本文以矿井提升机用YDT180M-6/8-11/3kW双绕组双速三相异步电动机为主要研究对象,通过采用双套绕组变极设计,以达到提高生产效率,提升起动性能、运行性能以及安全性的目的。主要研究内容如下:首先,针对以往双速电机采用单套绕组设计,容易出现大极数起动困难的问题,对电机进行了重新设计,提出新要求,即两种极数下均能正常起动,又能在高速下稳定运行。通过重新设计定子绕组形式、定转子槽型,选择合适的槽配合,采用基于磁路法电磁计算程序计算电机的电磁方案,通过调整电机线规、每槽导体数、定子内径以及气隙长度对电机进行性能优化,得出最佳电磁设计方案。其次,基于有限元法对所确定的电磁方案进行二维瞬态场建模和仿真,得到了电机处于6极和8极状态下的下磁力线分布和磁密分布,对电机在额定负载下的起动性能进行仿真并得到了电机处于6极和8极状态下的机械特性。仿真结果与电磁设计的计算结果进行对比,进一步验证电磁设计方案的可行性。随后对该双速变极电机的附加转矩进行了分析。再次,根据最佳电磁设计方案进行样机的试制,并对样机进行了型式试验。型式试验包括空载试验、堵转试验、负载试验等,得到了试验样机的主要电气性能数据。通过空载试验、堵转试验、负载试验绘制了电机的空载特性曲线、工作特性曲线及机械特性曲线等。将试验所测数据与基于等效磁路法的电磁计算结果、有限元仿真结果进行对比,验证了设计方案的合理性。最后,将本文设计的双绕组双速电机应用到矿井提升机控制系统中,并通过PLC控制技术、触摸屏以及云端监控相结合的方式设计矿井提升机控制系统,完成硬件电路设计和软件编程。实现对矿井提升过程的现场、远程控制及在线监控等功能,提高矿井提升设备控制系统的平稳性能和安全性。更多还原

【Abstract】 The variable pole dual speed motor used on the mine hoists is developed to solve the problem of difficult starting of scraper conveyors in coal mines and ensure safe production.The mining dual winding dual speed motor changes the pole number of the motor by selecting two sets of windings with different pole numbers placed in the stator slot,thus obtaining different speed and torque characteristics.The motor has the characteristics of low speed starting and high speed operation,which effectively solves the problem of difficult starting under heavy loads.It is an effective driving method.This thesis takes a YDT180M-6/8-11/3kW double winding double speed three-phase asynchronous motor for mine hoist as the main research object.Production efficiency,starting performance,operating performance,and safety have been improved due to the use of a dual winding pole changing method.The main research contents are as follows:First of all,in general,a single set of windings is designed in a two-speed motor.In this case,it is easy to encounter the problem of difficult starting in a large pole number state.Based on this situation,the motor was redesigned.New requirements have been put forward.It is required that the motor can start normally at both poles and operate stably at high speed.The connection form of stator winding,slot type of stator and rotor and slot fit of motor have been redesigned.The electromagnetic calculation program based on magnetic circuit method is applied to calculate the electromagnetic scheme of the motor.The performance of the motor is optimized by adjusting the wire gauge,the number of conductors per slot,the inner diameter of the stator and the length of the air gap.The best electromagnetic design scheme of the motor is obtained.Secondly,the two-dimensional transient field of the motor is modeled and simulated using the finite element method.The magnetic field line distribution and magnetic density distribution of the motor at two poles are obtained.The starting performance of the motor under rated load is simulated.The machinery of the motor in 6-pole and 8-pole state is obtained.The simulation results are compared with the calculation results of the electromagnetic design to further verify the feasibility of the electromagnetic design scheme.Subsequently,the additional torque of the double winding double speed three-phase asynchronous motor is analyzed.Thirdly,the experimental prototype is made based on the best electromagnetic design scheme.The type test of the test prototype has been carried out.Type test includes no-load test,locked-rotor test,load test,etc.The main electrical performance data of the test prototype are obtained through type test.Through no-load test,locked-rotor test and load test,the no-load characteristic curve,locked-rotor characteristic curve,working characteristic curve and mechanical characteristic curve of the motor are obtained.The test data are compared with electromagnetic calculation results and finite element simulation results.The rationality of the electromagnetic design scheme has been verified.Finally,double winding double speed three-phase motor designed in this thesis is applied to the mine hoist control system.The combination of PLC control technology,touch screen,and cloud monitoring has been redesigned and applied to the control system.The hardware circuit design and software programming of the control system have been completed.Functions such as on-site,remote control,and online monitoring of the mine hoisting process are implemented in the control system.The stability and safety of the control system have been improved.更多还原