How to make a Variable Frequency Drive (VFD) | 2: Hardware Design

Can you give me a complete wiring diagram please?

Cod?

Excellent ❤

You can't have 2 grounds ,,,, if you lost ground on the HV side for some reason the gap in the ground plane will be dangerous ....

Why didn't you try to use STM8S, it has 1 advanced control timer with 3 complementary PWM pairs?!

i wondered if you could use a FET to discharge the caps, after switch-off...or a tiny relay off the AC input, to switch on the bleed resistors...or an optoisolator, from the AC input, which pulls down the gate of the discharge FET (a bit of RC, too) until the AC goes away, at which point the FET gets biased on, and pulls down the capacitors to some lower voltage...

One issue with a charging resistor is that it doesn't solve huge current spikes during normal operation due to a very short conduction angle. Such large capacitance means that the peak current through the rectifier is many times the current draw of the device. This leads to higher losses and, more importantly, a lot of harmonics introduced. High power diode rectifiers like that create a lot of noise on the AC side which may affect other electronics.
Even without PFC rectifiers, this can be partially remedied by adding a relatively large inductance after the rectifier. A 10 mH choke would smooth out the current spikes and it may also remove the need for the charging resistor altogether since the current is now limited by how quickly the choke current can raise since there's no longer a dead short between L and N.
Cost-wise, the charging resistor circuit is a lot cheaper than appropriately sized choke (which is still cheaper than a 2 kW active rectifier) so it may be fine for a diy solution.

Kindly show wiring connections for single phase motor!

your work is marvelous but i face some difficulty with your program which have (ISR (TIMER0_OVF_vect);
{ ) This error..could you help me if you have some free time.

sir please send me the gerber file

Very informatic. good luck

It is posible to make vfd for 10Hp three phase motor from single phase power source with your diagram?

Awesome project to begin with! I am also designing my own VFD and use your videos as a reference design guide. However, I do have a question about the DC-bus capacitors. As shown in the video you used the following formula: Farad = Ampere*second/Volt. The formula itself is clear, but in the sidenotes of the schematics you used 8[A] as current for the capacitors. How did you determine this? Since it is DC I thought it could be done with I=P/U, but then I don't get the same value.

Can it run 0.75 kw motor?

I learn it more and more.

I also build my own vfd, yours was way much better. The difference is the motor driver ic, the relay and bleeding resistor, 1 phase to 3 phase capabilities, and i just use arduino uno because i was too lazy to build my own atmega 328 circuit. Nice job👍

Add: I do not see a step up transformer, your 2kw motor will only ouput around 1.5k without it.

Sir, how did you calculate for the bus capacitors. Your calculated value is 26665 micro farad but you use less than that on the capacitor bus. Can you clarify pls. Thanks

Hi Matan very interesting project :))) Is the schematic of your project published anywhere ?

Thank you Mr. Pazi. This is one of the clearest explanations of VFD operation and design I have seen. I plan to share this with my engineers and technicians to improve their understanding of VFD theory and operation. As a side note, what CAD software do you use? Thanks again. Kind regards, John Stilwell

Good work, thanks 👍!