变频器设计使用参考外文文献翻译.doc

毕业论文(设计)外文资料翻译 姓 名　 学 号 年 级 专 业 系　（院） 指导教师评语： 签名： 年 月 日  外文文献及译文 Converter reference design (1) Converter Selection:  Selection to determine the frequency converter when the following points:  1) The purpose of a variable frequency; constant pressure to control or constant current control.  2) the load converter types such as leaves or pump volume pumps, with special attention to load the performance curve, the performance curve of the decision of the ways and means.  3) the frequency converter and load matching  Voltage match: a rated voltage converter with a rated voltage line with the load. Current matches: ordinary pump, the rated current inverter and motor rated current match. For special load such as deep-water pumps, and so on need to refer to the electrical performance parameters to determine the most current inverter current and Guozainengli. Torque match: in this case constant torque load or slow down when the device may have occurred.  4) the use of high-speed motor drive inverter, because of the high-speed motor, anti-small, high harmonics lead to increased output current value increases. So for high-speed motor inverter Selection, its capacity to be slightly larger than the ordinary motor selection.  5) If the frequency converter to a long cable run, this time to take measures to curb the long cable to the impact of capacitive coupling, inadequate efforts to avoid converter, so in this case, the drive to enlarge the capacity of a file or the converter Output installed output reactor.  6) For the application of some special occasions, such as high temperatures, high altitude, at this time would cause the down converter capacity, the drive to enlarge the capacity of a block.  (2) inverter control schematic design:  1) First con