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隨著我國十二五規劃制造業目標的提出，我國制造業開始以發展先進裝備、促進制造業由大變強作爲未來發展的方向。這其中，變頻器以其獨有的特點在制造業領域中迅速得到了推廣，占領了市場。

變頻器是工控系統的重要組成設備，安裝在電機前端以實現調速和節能。變頻技術因其具有的優異性能將在工業調速和精密控制領域得到進一步推廣。高壓變頻器後端主要拖動風機、水泵類負載，實際節電效果達30%-60%，未來該業市場發展將受益于大中型項目改;低壓變頻器與控制層和執行層設備共同組成自動化控制系統，未來發展將受益于制造業裝備升級。

變頻器趨向多元化

从整体看，我國變頻器行業的競爭將日趨激烈。由于市场极具诱惑力，潜在容量十分可观，不断吸引着行业新参与者进入，而现有市场已形成一定规模，发展日渐成熟，未来的资源掠夺、市场争战将是必然。随着技术上不断进步，产品质量的稳定性逐渐提升，加上服务和价格等方面的优势，国内厂家的竞争力将愈加强大。

從需求方面看，變頻器也正逐漸走向多元化，通用型、專用型産品的出現都是爲了滿足用戶的多樣需求。此外，變頻器廠商也更多關注産品質量和使用安全，積極尋求更大的突破，使得變頻器在惡劣的環境也能很好的工作，並確保使用安全和用戶的正常生産。

節能環保成不變的主題

我國的風機、水泵、空氣壓縮機等主要電機設備爲滿足運行中的最高功率要求，輸出功率經常有很大的設計冗余，若使用機械調速能量被大量浪費在閥門和風門擋板上。變頻技術通過電力電子控制完成調速，在後端拖動電機使其轉速變化範圍增大，頻率高時效果更爲明顯。風機水泵類負載最適宜安裝變頻器節能，相比低壓變頻，高壓技術在細分行業使用更爲廣泛。

有關專家對比了電氣設備中幾種主要節能産品效果，其中變頻器效率高達30%~60%，使用時只需裝在電機前端，對原有設備改動較小。

節能環保推廣時推動我國變頻器行業發展的動力，變頻技術也正處于從調速到節能的轉變過程。十二五規劃提出了制造裝備升級和工業節能環保，確立了未來行業發展仍將走調速節能並舉的路徑。預計低壓變頻器一自動化改造和進口替代爲主線，國內企業將重點發展控制和驅動技術;高壓變頻器依托國家節能環保政策，下遊仍以電力、冶金、水泥等的大型工業設備改造爲主，競爭加劇將刺激高性能産品國産化提速。

For an Oriental city Tokio has remarkably wide streets, and some of them are laid out with all the care of Western engineering. In the course of their morning ride the party came to Sakuradu Avenue, which Fred recognized from a drawing by a native artist, who had taken pains to preserve the architecture of the buildings on each side with complete fidelity. The foundations of the houses were of irregular stones cut in the form of lozenges, but not with mathematical accuracy. The boys had already noticed this form of hewing stone in the walls of the castles, where some very large blocks were piled. They were reported to have been brought from distant parts of the empire, and the cost of their transportation must have been very great. Few of the houses were of more than two stories, and the great majority were of only one. Along Sakuradu Avenue they were of two stories, and had long and low windows with paper screens, so that it was impossible for a person in the street to see what was going on inside. The eaves projected far over the upright sides, and thus formed a shelter that was very acceptable in the heat of summer, while in rainy weather it had many advantages. These yashikis were formerly the property of Daimios, but are now occupied by the Foreign Office and the War Department. Inside the enclosure there are many shade-trees, and they make a cooling contrast to the plain walls of the buildings. The Japanese rarely paint the interior or the exterior of their buildings. Nearly everything is finished in the natural color of the wood, and very pretty the wood is too. It is something like oak in appearance, but a trifle darker, and is[Pg 120] susceptible of a high polish. It admits of a great variety of uses, and is very easily wrought. It is known as keyaki-wood; and, in spite of the immense quantity that is annually used, it is cheap and abundant. "Shut it," said Charlotte, with a sigh like that which had risen when the lead first struck her. "If I could be moved ever so little,--" she said. "That's his look-out, madam. If the sick lady isn't Charlotte Oli'--" The truth is that Doctor Allingham had not been able to summon the courage to make a further examination of the Clockwork man; and he had permitted himself to assume that there would be no immediate developments. So far as was possible he had allowed himself that very necessary relaxation, and he had insisted upon Gregg sharing it with him. The Clockwork man was not quite what either of them had, alternatively, hoped or feared. From Allingham's point of view, in particular, he was not that bogey of the inhuman fear which his original conduct had suggested. True, he was still an unthinkable monstrosity, an awful revelation; but since the discovery of the printed instructions it had been possible to regard him with a little more equanimity. The Clockwork man was a figment of the future, but he was not the whole future. Skip this postscript if you don't want your sensibilities all Larry took a swift, sharp look around the enclosure. His railroad friend again came up with some hot coffee and broiled meat, and explained that after the train had reached a station some miles out it got orders to run back and clear the track for some trains of troops from the Army of the Potomac which were being rushed through. The Deacon's heart almost sank in despair, but he took the coffee and meat, and helped the boys to it. As they were all eating they heard a voice outside which struck on the chords of their memories: "Whose head'll you knock off?" said a burly man, thrusting himself in front of the lawyer, with his fist doubled. "Why," said Si, "I supposed that they was too tired to do anything but lay down and go to sleep. What'd they do?" "It isn't me. I only asked for a little time to think it over, and then you go and cool off." These tricks were never unkind, for David and William were the most benevolent little boys. They saw life through a golden mist, it smelt of milk and apples, it was full of soft lowings and bleatings and cheepings, of gentle noses to stroke and little downy things to hold. For the first time since it became Reuben's, Odiam made children happy. The farm which had been a galley and a prison to those before them, was an enchanted land of adventure to these two. Old Beatup, who remembered earlier things, would sometimes smile when he saw them trotting hand in hand about the yard, playing long hours in the orchard, and now and then[Pg 385] pleading as a special favour to be allowed to feed the chickens, or help fetch the cows home. He seemed to see the farm peopled by little ghosts who had never dared trot about aimlessly, or had time to play, and had fed the fowls and fetched the cows not as a treat and an adventure, but as a dreary part of the day's grind ... he reflected that "the m?aster had learned summat by the others, surelye." "My lord," said the intrepid yeoman, "I had a right to defend my dwelling against unlawful assault." Here Calverley's quick ear caught the sound of the tramping of a horse—his heart beat quick—it might be a traveller journeying to Gloucester, but it was more probable that it was the messenger. He threw the bridle of his horse over the branch of a tree, sprang to the end of the path, and, concealing himself behind the under-wood, discovered in a moment, by the dark medley hue of the rider's dress, that it was the man he expected. He hurried back, and, mounting his steed, waited till the echo of the horse's hoofs could no longer be distinguished; and then, giving the impulse to his own spirited animal, he was the next moment bounding at full speed after the messenger, followed at a distance by his accomplice. No reply was given, but the door was instantly unclosed by Holgrave. Black Jack stood in the shade, just beyond the light that streamed from within, but so close that Holgrave, without crossing the threshold, merely leant his head forward, and heard him say, "Stephen Holgrave, do you remember the cross-roads and Hailes church-yard?" HoME 欧美videosgratis浓毛ENTER NUMBET 002www.i-im.com.cn
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