Based on the analytic analysis of the linear synchronous motor ’ s layered model , the paper deducted the composing of air gap magnetic fields and the analytic expression of levitating and advancing force . these results provide theoretic guidance not only for the analysis and measurement of the vehicle ’ s air - gap magnetic fields but also for the eatablishment of the 采用各向异性介质近似模拟齿槽区域,并引入定子和转子等效电流层的概念,建立了直线同步电机的磁场分层模型,在此基础上得到了气隙磁场的组成以及悬浮力和推力的解析表达式,为气隙磁场的分析和测量以及列车运动情况下电磁力软测量模型的建立提供了理论指导。
The advantages of this modified technique can be stated as follows : ( 1 ) healing was apparently faster . ( 2 ) postoperative pain was minimal . ( 3 ) depth of vestibular fornix was increased markedly . ( 4 ) frenum and muscle attachment pull almost completely relieved . ( 5 ) there was less possibility of exposing a dehiscence or creating bone 1055 on adjacent teeth . ( 6 ) a function - ally adequate zone of attached gingiva was numerically increased 本改良法的优点，可归纳以下几点: ( 1 )手术伤口愈合快( 2 )术后疼痛小( 3 )口腔前庭宽度明显增加( 4 )颊系常及肌肉的拉扯，几乎获得完全改善( 5 )不易引起手术区周围齿槽骨的裂开缺损( 6 )固著性齿龈宽度的增加至为明显。
A permanent magnet synchronous motor is selected so that the system could work excellently . multiform measures are taken to weakening the torque ripple , such as adopting stator - flume , choosing right ratio of magnet - width and slot - width , and programming properly . a permanent magnet synchronous motor cad software is worked out for predigesting the design of the motor 力矩脉动是衡量交流伺服系统性能优劣的重要指标，为达到理想的控制效果，系统采用正弦波驱动的稀土永磁同步电动机作为执行元件，电机本体的设计综合采用定子斜槽、将转子永磁体连续移位、合理选择永磁体宽度和齿槽宽度比等方法，基本消除了齿槽转矩；对于纹波转矩，系统采用软件的方式加以削弱和补偿。
Set up the following 2d parametric models : ( dinitial contour of cone . ( 2 ) six types of inserts : cut insert , conical insert , ovoid insert , chisel insert , gage insert and scoop chisel insert . ( 3 ) twelve types of slots : six slots between the rows of inserts ; six slots on the head of cone 建立了以下几种二维参数化模型： ( 1 )牙轮初始轮廓； ( 2 )六种牙齿，包括平顶齿、锥形齿、球形齿、楔形齿、边楔齿和勺形齿； ( 3 )十二种齿槽，其中六种牙轮齿圈之间的齿槽、六种牙轮顶端的齿槽。
For the bldcm which has a general crest width of the back - emf waveform , two kinds of torque ripple conditions when drived by sine - wave current as well as by square - wave current are deduced based on the mathematical models . in addition , a comparison is carried out between these two conditions , which indicates that sinusoidal current driving is more favorable to minimizing the torque ripple when the crest width of the back - emf waveform is less than a certain value 阐述了抑制齿槽转矩措施对反电动势波形的影响，利用无刷直流电机的数学模型推导并比较了任意平顶宽度梯形波反电动势在正弦波和矩形波两种电流驱动下的电磁转矩脉动情况，得出在梯形波平顶宽度减小到一定数值后采用正弦电流驱动更有利于减小电磁转矩脉动。
