Paul and Sabrina's Cheap 3 Phase Inverter (AC Controller) with Field Oriented Control

[thingstodo]

An second update from Dec 21

I have no video from this part .. the file is corrupted and I cannot recover it ..

So to summarize the rotation check:

- the DC motor turns CW facing the rear or aux shaft, just like before
- the AC motor turns that same shaft CW

So the 'brakes' still resist the rotation of the DC motor. I managed to connect the wires back the same way that they were before the Heat sink experiment

[MPaulHolmes]

You can use electrolytics. You just have to be more careful about turnoff spikes, and make sure they don't get too hot.

Oops, I'll update github with the latest code probably tomorrow.

I don't have a hardware repository. That would be a good idea though. Off to watch Quick draw mcGraw with my 4 year old! haha

[ale0502]

sorry if I misspoke, I have 12 IGBT in total. 4 per phase, 2 to B+ and 2 to B-.

How do you indicate to the DSP to rotate in reverse?

thanks!

[MPaulHolmes]

You just command negative Iq. In other words, give it positive throttle and it will spin one way, and "negative" throttle makes it spin the other way. super easy!

[ale0502]

OK, i understand that, but for the throttle you have only a potentiometer, how do you give negative or positive?

[MPaulHolmes]

You just declare "zero" throttle to be somewhere in the middle of the throttle range.

[ale0502]

For regen brake, I need IGBTs with diodes inside? In my case i dont have it, I should add external power diodes?
What else should I know in my design to include regenerative braking?

thanks

[ale0502]

I saw your new design and you added transistors in push-pull configuration to handle the IGBT, I am using 6 x FOD3184, It´s not enough for directly manage the IGBT gates?

[MPaulHolmes]

I'm sure the FOD3184 would be fine. You would want to keep the gate resistor values to around 8 or 10 Ohm I suppose (or larger), but that's not that big of a deal. I just did this approach so I could do like 12amp of gate drive, which allows for 2Ohm gate resistors, which reduces heat loss on very large IGBT half bridge modules.

[thingstodo]

An update from Dec 21 - troubleshooting after AC controller power up

https://youtu.be/ruXD3osjh0U