Siemens frequency converter
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Question: When a Siemens inverter is operating normally, how do the three-phase voltage and current entering the inverter change? Is it related to the output frequency of the inverter and the current of the motor? I just graduated and know little; I hope experts can give me some guidance!
First, it is rectified to 530V DC, and then inverted into controllable AC, usually with a u/f = constant relationship
It is a process of rectifying to direct current and then inverting it back to “alternating current”. The 380V, 50Hz alternating current is first rectified into direct current of over 500 volts, and then an alternating current of the corresponding frequency is generated based on the frequency signal source. The alternating current produced here is not a standard sine wave, but its effects are equivalent to those of a standard sine voltage.
Throughout the entire frequency conversion process of AC–DC–AC, the resulting AC signal contains certain harmonics, and it cannot be a sine wave.