大转矩磁流变挤压制动器设计及制动特性研究

发布时间：2018-04-04 02:56

  本文选题：磁流变制动器　切入点：大转矩　出处：《中国矿业大学》2017年硕士论文

【摘要】：磁流变制动器是以磁流变液为工作介质,利用磁流变液的流变特性随外加磁场的变化而急剧变化的特点开发的新型制动器。这种制动器的制动转矩可由外加磁场连续控制,具有结构简单、反应迅速、控制方便等优点,在工程领域具有广泛的应用前景。针对目前磁流变制动器制动转矩较小、散热较差等问题,本文开展了如下研究:(1)研究了磁流变制动基本理论和磁流变制动器结构设计理论,设计了目标值为2000N·m的大转矩磁流变挤压制动器的总体结构,并对其散热方式、挤压方式和密封方式进行了详细的设计与分析。(2)在磁路设计基本理论研究的基础上,对大转矩磁流变挤压制动器的磁路参数进行了详细设计;利用Ansoft Maxwell对磁流变制动器进行了磁路仿真,得到了磁流变液工作间隙磁场的分布情况;进行了磁场实验测试,验证了仿真结果的正确性。(3)介绍了热传递的基本理论和磁流变制动器的工作状态,对大转矩磁流变制动器的热源进行了分析,利用理论及实验仿真求解了磁流变液的热性能参数;基于ANSYS分析了磁流变制动器的稳态、瞬态温度场,研究了不同制动滑差功率和散热条件对制动器温度的影响规律;进行了温度场实验测试,验证了仿真结果的正确性。(4)搭建了大转矩磁流变挤压制动系统实验台,并进行了无挤压制动特性、挤压制动特性和温度特性实验。实验结果表明:该制动器空载转矩较小、制动转矩调节特性和恒转矩特性较好、响应速度较快;无挤压时,制动转矩最大为1300N·m,轴向挤压压力为1.5MPa时,制动转矩增大了90%,径向挤压压力为2MPa时,制动转矩增大了40%;制动器工作温度最高为90℃,温升上升情况受滑差功率和散热条件影响;在最优散热、有挤压情况下制动转矩最高可达2540N·m,允许滑差功率为36.6kW。
[Abstract]:Magnetorheological brake is a new type of brake, which is developed with the magnetorheological fluid as the working medium and the rheological characteristics of the magnetorheological fluid changing sharply with the change of the external magnetic field.The brake torque of this brake can be continuously controlled by an external magnetic field, which has the advantages of simple structure, rapid reaction and convenient control, and has a wide application prospect in engineering field.Aiming at the problems of low braking torque and poor heat dissipation, the basic theory of magneto-rheological brake and the theory of structure design of magneto-rheological brake are studied in this paper.The overall structure of high torque magneto-rheological extrusion brake with a target value of 2000Nm is designed, and the heat dissipation mode, extrusion mode and sealing mode are designed and analyzed in detail.The magnetic circuit parameters of the large torque magneto-rheological extrusion brake are designed in detail, the magnetic circuit simulation of the magnetorheological brake is carried out by using Ansoft Maxwell, and the distribution of magnetic field between the magnetorheological fluid working gaps is obtained.The correctness of the simulation results is verified. The basic theory of heat transfer and the working state of the magneto-rheological brake are introduced, and the heat source of the magneto-rheological brake with large torque is analyzed.The thermal performance parameters of the magnetorheological fluid are solved by theoretical and experimental simulation, and the steady and transient temperature fields of the magneto-rheological brake are analyzed based on ANSYS, and the influence of different braking slip power and heat dissipation conditions on the temperature of the brake is studied.The experimental results of temperature field are tested to verify the correctness of the simulation results. (4) A large torque magneto-rheological extrusion braking system is built, and experiments on the non-extrusion braking characteristics, extrusion braking characteristics and temperature characteristics are carried out.The experimental results show that the brake has less no-load torque, better torque regulation characteristic and constant torque characteristic, and faster response speed, when the maximum braking torque is 1300N m and the axial extrusion pressure is 1.5MPa, the maximum brake torque is 1300Nm, and the axial extrusion pressure is 1.5MPa.The brake torque increases by 90%, when the radial extrusion pressure is 2MPa, the brake torque increases by 40%; the working temperature of the brake is up to 90 鈩，

本文编号：1708062