Variable frequency drive
I have another question discussing maglev theory and i was directed that the true way to build this project was to use 3-phase power!
So this question, although related, is also an entirely new project in its own right!
Now to the point, i have been researching single to 3-phase conversion, and there are a few options available like rotary or static phase converters, but i have been intruiged by a device called a variable frequency drive!
Okay so what i understand so far (i think) is that these convert ac to dc, run that dc through a H bridge rectifier using igbt's and then convert the 3 outputs back to ac...... okay assuming my analogy is correct so far, to my question,
1. How are the igbt's triggered in the h bridge? do they use a function generator with altering timesteps to create the seperate phases?
2. Also how are these kept in sequence with eachother?
Many thanks in advance for any help you can provide!