机械专业外文文献翻译-外文翻译--恒压供水变频器

1、Constant pressure water supply frequency changer The transistor frequency changer not only overcame has formerly exchangedvelocity modulation many shortcomings, moreover the velocity modulation performance might compare favorably with the direct current motor velocity modulation performance.The three-phase asynchronous motor has the service to be convenient, merit andso on price small advantage, power and rotational speed adapt breadth, its frequency conversion velocity modulation technology in

2、the miniaturization, the low cost and the redundant reliable aspect holds the obvious superiority. To the end of the 80s, the alternating current machine frequency conversion velocity modulationtechnology rapidly develops into a mature technology, it will supply the alternatingcurrent machine the labor frequency alternating current supply to turn direct currentafter the diode rectification, again by component and so on IGBT or GTR module counter will turn the alternating current supply which the

3、 frequency might move,will drive the electrical machinery by this power source to move under the speedchange condition, and automatic suitable strain load condition. After it changed in the traditional industry the electrical machinery to start only can by the ratedpower, decide the rotational speed the sole movement way, thus achieved the energy conservation goal. The modern frequency conversion velocity modulationtechnology applies in the electric power water pump water supply system. Because

4、the frequency conversion velocity modulation has the velocity modula-tion the physical characteristics well, efficiency high, velocity modulation scope-wide, precision high, adjusting character curve smooth, may continual realize, thesteady velocity modulation, the volume small, the maintenance simple is conven-ient, the automated level higher a series of prominent merits but time peoples favor. When it applies especially in the air blower, the water pump and so on the large capacity load, may o

5、btain the energy conservation effect which other velocity modulation ways is unable to compare. The frequency conversion velocity modulation system main equipment is provides the frequency conversion power source the frequency changer, the frequency changer may divide into exchange - direct current - to exchange the frequency changer and the exchange - exchanges the frequency changer two big kinds, at present domestic mostly uses handsover - is straight - hands over the frequency changer.Has bee

6、n published since the general frequency changer, the frequency conversion velocity modulation technology obtained the widespread application in each domain. The frequency conversion modulates velocity the permanent waterlevel feed water equipment by its energy conservation, security, high quality meritand so on water supply quality, caused our country to supply water the profession technical equip level to start from the beginning of the 90s to experience a leap. The constant pressure, the perma

7、nent water level water supply velocity modula-tion system realization water pump electrical machinery step less speed regulation, rests on with the water level change regulator system movement parameter, in the water consumption change regulator system movement parameter, changes whenthe water consumption maintains the hydraulic pressure to be constant and the water level constantly by satisfies the water used request, is now most advanced,the reasonable energy conservation water supply system.

8、Obtained the very big development in the practical application. Along with the electric power electronic technology rapid development, the frequency changer function more and more isalso strong. Fully uses each kind of function which in the frequency changer sets, to the reasonable design frequency conversion velocity modulation constant pressurefeed water equipment, reduces the cost, guaranteed aspect and so on product quality has the extremely vital significance.In the short several years, the

9、 frequency conversion velocity modulation constant pressure water supply system experienced the developing process which consummated gradually, the early time has pumped the velocity modulation constant pressure system to pump only the velocity modulation system to replace gradually. Although only pumps the velocity modulation system design simple reliable, but because only pumps the electrical machinery depth velocity modulation to create the water pump, the electrical machinery operating efficiency lowly, but pumps the velocity modulation system investment more to save, the operating efficiency is high, by the actual proof is the most superior system design, very quickly develops into the leading product. The Semens frequency changer design level compares with various brands frequency changer, the function is formidable, impeccable! If again can from the design consider will service convenient to the future, The nature and enhanced the compon

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