From the course: Electrical Systems: Panel Boards, Frequency Drives, and Transformers
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Major components of a VFD
From the course: Electrical Systems: Panel Boards, Frequency Drives, and Transformers
Major components of a VFD
- [Instructor] There are three major components that all variable frequency drives have. They are a rectifier section, which is a group electronic components that convert the incoming AC current into DC current, usually using diodes. A DC-BUS section. This is where the converted DC current lives and its manipulated, typically to reduce the DC strength that will be converted back to AC power with a different frequency, and an inverter section. Here the manipulated DC current is converted back to use for AC current for the motor. When a variable frequency drive is in use, the voltage arrives on the left-hand side here with the incoming section. What goes into the rectifier, the rectifier then converts this AC signal into DC and it leaves the rectifier and goes into the DC-BUS. Within this DC-BUS, the current is then switched on and off repeatedly and quickly. This helps the drive create this artificial type of AC current. Then the power is handed off to the inverter where the DC is…
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