With the development of modern permanent magnet ( pm ) machine to high speed , high efficiency , high power density and micromation , the limitation of traditional rare earth pm machine is exhibited , such as higher ripple - free torque , higher losses , lower open - circuit magnetic field , etc . halbach motor , a new type permanent magnet motor , first proposed by american scholar klause halbach , has been studied very widely . halbach motor has higher magnetic field , usually as 1 . 4 times as that of traditional rare earth permanent magnet machine , which attributes to higher power density Halbach永磁电机是由美国学者klausehalbach提出后一直被广泛研究的一种新型永磁电机，和普通永磁电机相比其优越性有：气隙磁密比一般永磁电机可增大40 ，从而可有效提高电机的功率密度；固有的正弦分布磁场，可为电机设计和加工带来便利，降低成本；自屏蔽效应，转子可不再需要为磁路提供闭合回路，这为转子的选材提供了较大的空间。
With the development of permanent magnet materials , the permanent magnet ( pm ) machine shouldbe applied more and more widely because of its excellent efficiency , such as : high power density , low runcost , good reliabilityand efficient of conserving energy etc . in engineer , the initial scheme would be given by the engineer who has rich experiences when the electrical machine is designed 稀土永磁同步电动机具有效率高，功率密度大，成本低，运行可靠，节能效果好等优点，随着永磁材料的不断发展，稀土永磁同步电动机必将在各个领域得到越来越广泛的应用。在工程中进行电机设计时，一般都是由工程人员根据经验提出一个初步方案，然后进行试制与调整。
The background of rapidly developed uhsm ( ultra high speed machining ) technology is introduced and the key function of the uhs ( ultra high speed ) motorized spindle to uhsm is discussed in the thesis . after analyzing international technology status and trend of the uhs motorized spindle study , we research the core technologies related to the uhs motorized spindle in detail , such as optimized design of the motorized spindle structure , high speed bearing technologies , oil - gas lubication technologies , precision machining and assembly technologies , design and manufacture technologies of the built - in frameless motor etc . then the digital simulation of the motorized spindle sensor - less vector control system is studied thoroughly 本文从超高速加工技术飞速发展的背景出发，讨论了超高速电主轴对超高速加工技术发展的重要作用和意义；分析了超高速电主轴研究的国内外现状及发展趋势；详细论述了超高速电主轴的关键技术，包括电主轴结构优化设计、高速轴承技术、油气润滑技术、精密加工与精密装配技术以及内装式电机设计制造技术等，并深入研究了超高速电主轴无速度传感器矢量控制系统的数字仿真技术。
Control system by using of japanese p . l . c system and servo electrical drive system by using of west germany basic design in order to the cutting length , square , tension control and sheet counting can be operated directly through operator and machine interface , are equipped with automatic shutdown function and also the speed , the amount of reams , the square of decurler , cutting size , breakdown can be dispayed clearly . easier for controlling the operation 控制系统采用日本系统及西德伺服电机设计理念，使纸张裁切的长度菱角的方正张力的控制及张数的计数可透过人机界面直接输入，并有自动停机的功能设计，此外还可显示速度令数反曲器之工作角度总切断张数等数据，以及运转故障之显示，有助于机器维护工作的进行。
The third part of the work concerns the main influencing factors of the system low frequency oscillation , the small signal mathematical model of the inverter induction motor is established in the stator reference coordinate , effects of the motor parameter on the system low frequency oscillation are researched . then , by the analysis of the inverter nonlinear working characteristic , the internal relationship between the inverter dead time and the low frequency oscillation is studied and clarified , and the effects on the system low frequency oscillation are taken into account , which are produced by the dead time and change of carrier wave frequency of the inverter 首先建立了固定于定子坐标系中pwm逆变器-异步电动机小信号模型的基础，研究电机参数对系统低频振荡的影响；其次，通过逆变器非线性工作特性的分析，研究并揭示了逆变器死区时间与系统低频振荡的内在关系，考虑逆变器死区时间、载波频率的变化对系统低频振荡的影响；最后总结出提高和改善系统稳定运行的电机设计和逆变器v / f _ c曲线设置准则。
The main research work include ( 1 ) introduces the gemal method and steps of asteroidal magneto design , especially the method and steps of electromagnetism compute , follow these steps , the design parameters such as relative structure dimensions , coil and magnetic circuit parameters can be obtained . this method is easy to use . this thesis also provides a series of experiential coef ficients for the mode 本文主要工作如下： ( 1 )本文指出了星形磁电机设计的一般步骤和方法，重点讨论了电磁计算的方法步骤，据此可以得出有关机械结构尺寸、绕组及磁路参数等设计参数；本文提出的磁路计算方法，简单适用；本文还提出了一系列关键参数规范化设计模型的经验系数。
Moreover , it introduces the bldcm cad software which is widely used in the motor field and proposes the designing thoughts , and also gives the structure frame about this software . at the end it puts forward how to solve some technological hard problems about this software 项目中电机设计采用了作者参与开发的稀土永磁无刷直流电动机cad软件，在文中也对该软件进行了介绍，给出了关于该cad软件的主要设计思想和结构框架，并对软件编写中的一些技术难点提出了有效的解决途径和方法。
This paper demonstrates the fundamental principle systematically , including the design process of a halbach motor . in order to make the design more easier and reduce the designing period , cad is applied to the motor design : the concise matlab language , to some extend , reduces the workload in electromagnetism design ; the mathematic modeling and collating programs compiled by apdl language in ansys substantiate the precision of the electromagnetism design 为了减少电机设计的工作量和缩短电机开发的周期，本课题对halbach电机采用计算机辅助设计：简洁的matlab语言在一定程度上减少了halbach电机电磁设计的工作量，缩短了电机开发的周期；利用ansys自带的apdl语言编写的halbach电机建模与校核程序保证了电磁设计的准确性。
