Summary of Variable Frequency Drives Explained - VFD Basics IGBT inverter

00:00:00 - 00:15:00

This video explains the basics of variable frequency drives, which use IGBT inverters to control the speed of electrical motors. The current flow is alternately directed through diodes in a three-phase supply, and the oscilloscope shows an alternating sine wave pattern. The controller controls the opening and closing times of switches to vary the output frequency and voltage.

• 00:00:00 Variable frequency drives (VFDs) are used to control the rotational speed of an electric motor. They work by varying the frequency of the electricity being supplied to drive the motor, and by doing this, they can control the rotational speed of the motor. Electron flow is what's actually occurring when we use an oscilloscope to look at the electrical waveform of DC, and this flat line at the maximum voltage in the positive region is what we would see if we cut the power to a VFD. If we turn a VFD on and off repeatedly, we get a square wave pattern between zero and maximum. If we pulse the switch to open and close over different lengths of time, we get a pulsating pattern. Finally, the voltage is not constant in this type of electricity - it repeatedly moves from zero up to its peak then back to zero, then through the negative peak, and finally back to zero again.
• 00:05:00 The video explains how variable frequency drives (VFDs) work and how they convert a DC source into AC electricity. The video also covers the rectifier and inverter sections of a VFD.
• 00:10:00 The video explains the basics of variable frequency drives, which use IGBT inverters. The current flow is alternately directed through diodes in a three-phase supply, and the oscilloscope shows an alternating sine wave pattern. The controller controls the opening and closing times of switches to vary the output frequency and voltage. This setup can be used to control the speed of electrical motors, and unlock energy savings in various systems.
• 00:15:00 In this video, the basics of variable frequency drives are explained. IGBT inverter technology is discussed, and how it can be used in various applications.