Wuhan UHV specializes in producing series resonant withstand voltage devices. Next, we will share with you the series resonant manufacturer's introduction to reactors. Reactor related information: The reason for the low power factor on the input side of the frequency converter is very different from that of the low power factor of the power frequency motor Due to the fact that the motor is a reasonable series resonant load, the current lags behind the operation of irregular voltage phases, and the power factor depends on the phase relationship between current and voltage. The low output power factor of the frequency converter is due to its circuit industry structure. The driver is usually a "always deposit" structure, which means that the three-phase rectifier bridge and filter capacitor convert the DC three-phase AC power into adjustable frequency AC power through the control circuit 22 and inverter tube. In the process of rectification, only when the instantaneous value of the student AC power supply is greater than the DC system voltage UD, the rectifier diode will conduct, and there will be its own charging control current in the rectifier bridge. Obviously, the charging current can always appear in a discontinuous pulse signal waveform near the peak of the power supply for a limited time. This non sinusoidal wave has strong higher-order harmonic components The harmonic part of the instantaneous power "+" and the other part "a" are attributed to reactive power. This reactive power can result in a lower power factor of approximately 0.7 to 0.75 for China's variable frequency speed regulation technology system.

Because the input power factor of the inverter decreases. It is not a current waveform that lags behind the voltage, but rather a high-order harmonic current that can be formed, so we cannot simultaneously improve the power factor by analyzing parallel compensation capacitors But to minimize high harmonic currents as much as possible, the specific measure is to connect reactors JT is a DC reactor connected between the rectifier bridge and the filtering capacitor. The use of either method has a significant impact, and the joint development and application of both methods can improve the power factor to above 0/95. In addition to the improvement of power factor in DC reactors. It can also constrain the charging surge current at the moment of connecting the power supply system. Other than that, it is not allowed to connect capacitors at the output end of the frequency converter, which is connected to the motor 

Due to the so-called sine wave inverter output, the pulse width and duty cycle are actually the size of the dispersed pulse width sine modulation wave. This pulse sequence is the frequency of the inverter conduction tube of the converter, which is constantly alternately configured. If the output is connected to the terminal capacitor, during the alternating conduction process of the inverter tube, not only does it need to provide current, but it also increases the charging and discharging current of the capacitor motor, which can cause damage to the inverter tube. 

For most frequency converters, reactors are not standard technical equipment, but optional accessories. You should choose according to your needs. To reduce costs, sometimes equipment contributes without touching AC reactors, and the tolerance inverter system operates at low power factors.