Principle of servo electronic transformer

Brand CFS series servo electronic transformer is specially designed for ac servo motor of small electrical electronic transformer. It goes with the traditional power frequency transformer is essentially different, have qualitative leap in performance volume price and installation, is a good choice to upgrade power frequency transformer. Tap voltage is fixed power frequency transformer to be both safe and is not very suitable for a very prominent characteristics of servo motor. Ac servo motor of high precision high reactivity and strong ability to resist load mutation need low impedance power guarantee, otherwise will not be able to play its high performance. Popular said, ac servo quick reaction capability need power supply can be timely provided to its powerful current. But in servo drive and power of indirect isolation transformer, power servo system need only through the magnetic field to provide isolation transformer, in today's soaring copper prices environment, isolation transformer capacity generally greater than the capacity of the servo system is not much, only when the servo motor with overload start or overload, and so on and so forth, the need to provide several times at the moment of grid current, then hou isolation transformer core will be over the saturation point, reduce the output voltage, of course, also can't provide the size of current, so the servo system of the slow reaction, mechanical properties become soft, lose the advantages of servo system. , of course, this can be addressed by increasing the capacity of the power frequency transformer, general to ensure the performance of the servo system, the isolation transformer capacity of the servo system capacity is greater than 4 times the left and right sides, apparently, no one match like this. Eliminate the energy transfer between grid and servo system bottleneck is the most important electronic transformer design ideas, so it is designed to be a dynamic current gate, it through continuous tracking servo drive power feeder small voltage changes to adjust the current gate opening speed, thus resolving the problem of low power frequency transformer output impedance and very low impedance through the grid to the servo drive, to ensure the rapid energy supply of servo system. Security is a problem that nots allow to ignore, many people are worried about electronic transformer breakdown, internal components into 380 v voltage drive, drive burnt down. It is impossible to happen. Electronic transformer is not cause overpressure drive is not determined by the internal circuit structure and components, but is determined by the electrical principle, in order to achieve absolute security, electronic transformer input zero line is introduced, specially the connection, even if the all-pass electronic transformer, the voltage produced by the servo drive needs also happens to be rated voltage, so there was no overvoltage conditions at any time, only the user had a little trouble - more - - - To access the zero line. Added a wiring for absolute drive safety, no matter how you look at it, are all worth it. Moreover, stability under the condition of same capacity, electronic overload capacity than weak electrical device. The electronic components used in the power adjustment, in general, the main factors influencing the stability and longevity are: temperature, impact current, reverse current rising rate, reverse voltage rising rate and the quality of the main power device, etc. These factors more than limit state will lead to different damage phenomenon: the temperature exceeds limit state, cause chip internal melt overheat, cause short circuit, electronic transformer internal input from the grid current short circuit directly out from inside the chip, because the input impedance of the servo driver is much higher than short-circuit point, equivalent to disconnect, so electronic transformer internal input air switch trip short circuit can only lead to the front. To rise ultralimit state, a reverse current rising rate and reverse voltage will cause power chips with live effect, cause all-pass, servo driver get full voltage, components quality is easy to understand, good quality, imported, allowance for large components price is high, in this regard, price factor, is crucial. This company produces the main power electronic transformer device generally take about five times the allowance, all imported from Germany, the actual work itself does not exist in the heating phenomenon, environment temperature does not exceed 65 ℃. CFS series electronic transformer basic models from 3 kva to 30 kva, more than 30 kva need to customize. General match 0. Eight times the power of servo motor. CFS series servo motor electronic transformer has a characteristic, is the output terminal with a multimeter is the actual voltage. That use multimeter measuring power frequency transformer tap voltage installation personnel does not adapt, and even afraid to try. Actually for CFS electronic transformer output is dynamic current, ( Strictly within a dynamic adjustment circuit, current size) , it's just a adjustment device, there is no output voltage levels compare said. So it is cheap, to measure the real voltage, must be on both ends of the filter capacitance of the servo drive to measure dc voltage RMS transform again. But one thing is certain, the main electronic transformer zero at the input lines do not meet fire, how to answer the servo driver is likely to generate overvoltage, the internal circuit structure determines the breakdown, even if the power device on the servo driver inside the filter capacitor voltage conversion and only 230 v ac input valid value.