A Study on Minimization of Torque Ripple of Disk Brushless Permanent Magnet Motors Applied as Gearless Drive for Light Electric Vehicles

本项目的目的是研究如何使盘式无刷直流永磁电机的转矩涟漪最小化，同时保持高水平的比转矩（转矩与电机质量比）。初步结果表明，通过改变永磁体的形状和定子铁心的结构，以及改变电流波形，可以实现这一目的。本课题的研究将集中于两种盘式电机的三维空间磁场分析：环形和定子铁芯轴向磁通盘式电机，并利用电子转换器-永磁电机组的动态模型评估电机性能，以选择最佳解决方案。为了验证计算机模拟，将构建和测试实验室电机模型以及相应的转换器。从该项目获得的结果和经验将允许设计和制造平稳运行的电机，不仅适用于轻型低速电动车辆（特别是轮椅），而且适用于无法容忍高扭矩涟漪的广阔驱动领域。本项目生产的高效率高比转矩电动机，如果应用于工业变速驱动，将有助于延长电动汽车的行驶里程，节约能源，并降低最终产品的成本。该项目将为一名硕士和一名博士提供主题论文该项目的成果将通过经审查的出版物传播。

The aim of the project is to study how to minimize the torque ripple of disc brushless DC permanent magnet motors, keeping, at the same time, a high level specific torque (torque to motor mass ratio). Some preliminary results indicate that it can be achieved by modifying the shape of permanent magnets and the structure of the stator core, and by modifying the current waveform. The research on this subject will concentrate on analysis of magnetic field in 3-D space for two versions of disc motors: torus-type and disc motor with axial magnetic flux in a stator core, and on evaluation of motor performance using dynamic model of electronic converter - permanent magnet motor set in order to select the optimum solution. To verify the computer simulation a laboratory motor model, together with the appropriate converter will be built and tested.The results and experience obtained from the project will allow the design and manufacture of smoothly running motors that are required not only for light, low speed electric vehicles (in particular - wheelchairs), but also in a vast area of drives, where high torque ripple cannot be tolerated. The high efficiency motors with high specific torque, which will result from the project will contribute to the extension of the driving distance of electric vehicle and to save energy, if the motor is applied as a variable speed drive in industry, as well as to low the cost of the final product. This project will provide the subject for one M.Sc. and one for Ph.D. theses. The results of this project will be disseminated through reviewed publications.