How to change the frequency of the inverter?

by:V&T Technologies     2019-11-11
First look at the rectifier circuit, the current inverter is diode rectification, with capacitor filtering, inverter components using IGBT and other switching devices. Neither of them can control the amplitude of the voltage. The so-called frequency conversion transformer and Transformer actually 'impersonates' sine waves with rectangular waves of equal width through the principle of area equivalence. Therefore, the output voltage of this type of inverter is unchanged, then change the frequency of the inverter, will the output voltage change? As far as the frequency of the inverter is currently changed, we can modify the acceleration and deceleration time of the inverter, and then use the digital terminal to perform cyclic switching to create a pulse with a period of 10s for frequency switching. However, no matter what control mode, speed regulation below the base frequency, change the output frequency, and the output voltage will change; Speed Regulation above the base frequency, change the output frequency, and the output voltage is constant (Rated voltage of motor)No change. In addition, only changing the frequency does not change the voltage, which is easy to cause the motor overvoltage, easy to burn, causing certain safety hazards, so you need to pay attention when using.
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