Does the teacher know the working principle of the inverter?
Very basic questions, the principle of fine you go online search, everywhere, I do not like to copy someone else, I simply tell you about:
Voltage type inverter
Three-phase alternating current to the rectifier module, converted into DC, filter stored in the electrolytic capacitor, IGBT + and - from the electrolytic capacitor to take energy, by the DSP (or other controller) output PWM pulse control IGBT turn on and off, So the output AC, the AC and input AC waveform is very different, so that the inverter is also a source of interference.
Current filter in the middle of the filter is the inductor non-capacitance, we are more commonly used on the market and the economic converter are mostly voltage-type inverter.
The AC power rectification of the grid input is changed to direct current, and then the direct current is changed from AC by the control circuit according to the user's setting. The frequency is determined by the user. The motor is operated at this frequency to reach the change frequency. the goal of.
At present the main inverter is Mitsubishi you can go to their domestic sales site to find a specific inverter manual has a detailed explanation
Also popular said that the inverter is to change the operating frequency of some mechanical equipment control devices, such as motors, pumps, etc.
The frequency converter is an AC-DC-AC power electronic device that converts 50 Hz AC sine wave into straight high voltage direct current and then converts it into an AC power that can control the voltage and frequency, driving the three-phase AC motor.
