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The article presents the developing condition of PWM and SVPWM first.Then the theory of SVPWM is discussed in detail.The SVPWM is based on the thought of magnetic chain tracking.It makes the ideal magnetic chain circle of three-phased sysmmetry electric motor supplied by three-phased sysmmetry sine wave voltage for basis,uses the practical magnetic chain vector formed by the different switch modes of three-phased inverter to track the basic magnetic chain circle.During the course of tracking,the inverter changes the switch modes properly to form the PWM waves.Then the modulation wave of SVPWM is analyzed in detail.The modulation wave of SVPWM is implicit,but the analogous modulation wave in A-B-C axis needs to be calculated in order to expose the internal relation of SVPWM and SPWM.That is to show the implicit modulation wave of SVPWM. SVPWM actually is a transformed SPWM ruly sampled by the modulation wave which is injected by the zero prefaces based on space vectors.

本文首先对脉宽调制技术的发展现状进行了综述，在此基础上分析了电压空间矢量脉宽调制技术的发展现状；接着对空间电压矢量脉宽调制技术的基本原理进行了详细的分析和推导，SVPWM是基于磁链追踪的思想，它以三相对称正弦波电压供电下三相对称电动机定子理想磁链圆为基准，由三相逆变器不同开关模式下所形成的实际磁链矢量来追踪基准磁链圆的，在追踪的过程中，逆变器的开关模式作适当的切换，从而形成PWM波；然后详细分析了电压空间矢量脉宽调制技术的调制波，虽然SVPWM法的调制波是隐含的，但是为了揭示SVPWM法与SPWM法的内在联系，需要求出SVPWM在A-B-C坐标系上的等效调制波，也就是将SVPWM的隐含调制波显化；SVPWM实质是一种基于空间矢量在三相正弦波中注入了零序分量的调制波进行规则采样的一种变形SPWM。

First, according to the parts of materials processing operations, cutting tools and other relevant factors and choose the outline of the handle and part characteristics identify nine tools were cylindrical rough turning, cylindrical precision turning, external grooving cutter , internal thread cutter, Boring tool within the inner notch cutter, 93 ° left side knife, 93 ° right-side knife.

第一，根据本零件材料的加工工序、切削用量以及其他相关因素选用刀具及刀柄和零件的轮廓特点确定需要9把刀具分别为外圆粗车刀、外圆精车刀、外切槽刀、内螺纹刀、内镗孔刀、内切槽刀、93°左偏刀、93°右偏刀。

Professional production, The tool, cutting tool, CNC blade, hole hole groove knife knife, the knife, cut the slot, the circle is collected, hole threads, thread cutter knife blade, cutting and milling knife, acrylic, wheel hub, machine clip blade knife, piston ZhengLiuZi, universal tool, While producing weld dao/machine nipped dao/including difficult and special tools/non-standard tools, and undertake various non-standard customized extension milling styles.

专业生产；外圆车刀，切断车刀，数控刀片，内孔刀，内孔槽刀，外切槽刀，外圆正尖刀，内孔螺纹刀，螺纹刀片，铣刀，铣刀片，亚克力铣刀，轮毂刀，机夹轮毂刀片，雕刻刀，活塞刀，整流子车刀；同时生产焊接刀/机夹刀/包括高难度及特种车刀/非标刀具，并承接非标定制各种款式加长铣刀。

This motionless body, clad in rich stuffs, coloured silks, gold embroideries; this huge head, enfolded in a red-and-gold head-kerchief; the flat, big round face, wrinkled, furrowed, with two semicircular heavy folds starting on each side of wide, fierce nostrils, and enclosing a thick-lipped mouth; the throat like a bull; the vast corrugated brow overhanging the staring proud eyes---made a whole that, once seen, can never be forgotten.

那稳定不动的身体，穿着华贵的衣饰，染色的丝绸，同金织的锦绣；那庞大的头儿，裹着赤紫的头巾；扁平的大圆脸，满起着皱纹，另有两条半圆形的粗纹，从宽大凶猛的鼻孔两旁出发，围绕着厚厚的嘴唇；脖子像匹公牛；宽阔皱蹙的眉毛，罩在骄横的圆睁睁的眼睛上，——整个儿合在一起，叫你看见一回之后，永远再也不能忘记。

Jinjiang Fuhong Light Industry Weave Co.Ltd. is a morden enterprise who is professionally engaged in the research and development , manufacture, sale and service of the big circular knitting machine for knitted fabrics and knitted fabrics.Moreover it is a powerful young working team who stresses prestige and explores bravely;It covers 18,000 square meters,and owns more than 200 set of imported advanced producing and testing equipments.The main parts, raw materials and the complete set of producing and testing equipment are introduced from Germany and Taiwan.Furthermore, with much high salary, employing the former chief engineer of Textile

晋江富鸿轻纺有限公司是一家专业从事针织大圆机和针织布料研发、制造、销售和服务的现代化企业，同时也是一个讲求信誉、勇于开拓的强有力的年轻工作团队；公司占地面积18000平方米，拥有先进的进口生产和检测设备二百余台套，产品主要部件、原材料和全套的生产、检测工艺均来自德国和台湾；同时巨薪聘请原中国纺织工业研究所的总工和台湾专家主导大圆机和新针织面料的研发和技术管理工作，从而保证了公司产品外观、质量、性能一直领先于竞争对手。

In this study, a commercial CAD/CAM Software is used to plan and generate the multi-axis tool path, and a table rotating/tilting type five-axis machining center is used to perform the experimental machining operation. The material of the die studied is NAK 80 die tool steel, and the geometries are modeled as concave and convex spherical surfaces. Milling parameters considered are spindle speed, feed rate, and different types of cutting tool path. The experimental results show that the surface roughness for concave spherical surface is about 0.247 μm and roundness is about 0.0283 mm and the surface roughness for convex spherical surface is about 0.250 μm and spherical roundness is about 0.0551 mm under the cutting conditions mentioned in this study.

本研究的实验方法与步骤包括利用商用CAD/CAM系统针对实验对象规划三轴/五轴同动加工路径，并经后处理程式转换，在本实验室之平台倾斜/旋转型之五轴加工机上进行实验，实验对象为NAK80模具钢材料之凹与凸球形曲面之加工，此外考虑的切削条件有主轴转速、进给速度、加工路径等，在本研究所设定之最佳切削条件下，凹球形曲面之真圆度约为0.0283 mm，粗糙度为0.247 μm，而在相同切削条件下，凸球形曲面之真圆度为0.0551 mm，粗糙度为0.250 μm。

The camber near the switch point changes rather slowly, while it changesrapidly at certain distance range from switch rail.

建议尖轨轨头非工作边的刨切曲线采用缓和曲线和圆曲线的组合线型，在尖轨理论尖端至圆曲线之间，为一曲率渐变的缓和曲线，在尖轨尖端附近矢度变化较慢，而在距尖轨一定范围时，矢度变化较快。

But this idea appears in Chinese, has also showed another image is a first in Singapore to Shanghai Bureau of the Chinese writing that the big hole the roof, too, like Japan Yuanyuandikan sun flag.

而且，50米直径的&圆洞&就是不远处&东方明珠&第二个球的大小，空心圆洞与实心球。。。。。。

Nine remember past times the breath, naturally also carries on many good food, for example fragrant Q is strong yu the circle, besides original sweet potato, sweet potato taste, but also has special wipes the tea taste, Leng Rejie is suitable; The red pickled meat circle by the traditional ancient method manufacture in the stuffing, in matching the soft tender cover, the sauce material which the flavor appropriatelies, forms 绝 the wonderful taste in your mouth; In addition also has the black sugar hemp, fermented bean curd, non-lead earth preserved egg and so on, is the suitable delicacy partner hand rituals!

九份的怀旧气息，自然而然的也承袭的许多美食，例如香 Q 有劲的芋圆，除了原有的地瓜、芋头口味之外，还有特别的抹茶口味，冷热皆宜喔；红糟肉圆则以传统古法制作内馅儿，搭配上软嫩的外皮，味道恰如其分的酱料，在您口中形成绝妙的滋味；此外还有黑糖麻糬、豆腐乳、无铅土皮蛋等等，都是相当美味的伴手礼喔！

THIS SERIES OF CIRCULAR-MOTION VIBRATING SCREEN IS SPECIAL DESIGNED FOR STONE PIT TO SIEVE SOME DIFFERENT SIZES OF STONE.

本圆振动筛系列为圆运动，是专门为采石场筛分料石设计的。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。