變頻器外文文獻(xiàn)翻譯---變頻器設(shè)計(jì)使用參考-其他專業(yè)-全文預(yù)覽
【正文】 and Guozainengli. Torque match: in this case constant torque load or slow down when the device may have occurred. 4) the use of highspeed motor drive inverter, because of the highspeed motor, antismall, high harmonics lead to increased output current value increases. So for highspeed 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 confirmation of the installation environment Converter Operating temperature: highpower converter is the internal electronic ponents, vulnerable to the effects of temperature, product general requirements for 0 ~ 55 ℃ , but in order to ensure the safe, reliable, the use of room to be taken into account, the best control in 40 ℃ below. In the control box, the converter box should generally be installed in the upper and strictly ply with the Manual of installation requirements, absolutely not be allowed to heating elements or ponents easily fever close to the converter installed at the bottom. Ambient temperature: the temperature is too high and large temperature changes, within easy converter there is dew, the insulation properties will be greatly reduced, or even shortcircuit caused the accident. When necessary, to be added to the desiccant in the box and heater. In water treatment, generally heavier than water vapor, if the temperature changes, then this problem would be more prominent. Corrosive gases: the use of the environment if the corrosive gas concentrations, will not only lead corrosion of ponents, printed circuit boards, but it will also accelerate the aging of plastic devices, reducing insulation properties. Vibration and shock: the control cabi with converter by vibration and mechanical shocks will cause electrical connection is bad. Huaian thermoelectric there such a problem. Apart from raising the control cabi at this time of the mechanical strength, vibration and shock away from the source, we must also use seismic rubber pad fixed within and outside the control cabi, such as electromagic switches have a vibration ponents. Equipment operation after a period of time and should conduct inspections and maintenance. Electromagic interference: Inverter at work due to rectification and frequency, produce around a lot of electromagic interference, these highfrequency electromagic waves in the vicinity of the instrument, apparatus, a certain interference. Therefore, the cabi instrumentation and electronic systems, it should be optional metal, shielding the inverter instrument interference. All the ponents should be reliable grounding, in addition, the electrical ponents, equipment and instrumentation should use the connectivity between the shielding control cables, and the shield should be grounded. If handled properly electromagic interference, often cause the entire system does not work, leading to the control unit failure or damage. 2) Drives and determine the distance between the electrical cables and wiring methods Drives and motor the short distance should be as much as possible. This reduces the capacitance of the cable, reducing the emission source of interference. Control
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