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

[amazuki]

here I am ben, will start crawling from page 1, dont know when i will reach the current posting

[sawickm]

Originally Posted by TheSGC

What schematic program should I use?

The schematic program that you use has to be compatible with your PCB layout software? It would be nice if could post PDF file of your AC Controller schematic for us to view.

My power section section will be completely independent of the logic

I'm glad to hear that your "logic" controller will be separate from your power PCB. Doing that makes your whole system scalable, just like Paul's DC controller system. It works out well to have the controller PCB, Driver PCB, and Power PCB separate.

Looking forward to seeing more of your project !!!

- Mark

[TheSGC]

Originally Posted by sawickm

The schematic program that you use has to be compatible with your PCB layout software? It would be nice if could post PDF file of your AC Controller schematic for us to view.



I'm glad to hear that your "logic" controller will be separate from your power PCB. Doing that makes your whole system scalable, just like Paul's DC controller system. It works out well to have the controller PCB, Driver PCB, and Power PCB separate.

Looking forward to seeing more of your project !!!

- Mark

I'll start off using ExpressPCB and make a PDF out of it. I have tomorrow free so I will see how much of it I can get done.

I figure if I take enough time on the Power Section, Paul will come out with a logic section.

[dave koller]

Originally Posted by TheSGC

I'll start off using ExpressPCB and make a PDF out of it. I have tomorrow free so I will see how much of it I can get done.

I figure if I take enough time on the Power Section, Paul will come out with a logic section.

I'll take a copy of that ExpressPCB as it will drop into my ExpressPCB David LOL!

My next Saturn is going to be AC - so I got my eye on what comes of your design - and Pauls logic ( or my own "old school" logic - Jack B and I have lots of that old school !)

[justanothernoob]

I am quite interested if there has been any further progress in the A/C controller. I was browsing through Ebay the other day and noticed there are "brushless" motor controllers capable of 200 amps for about 40 dollars + shipping. I assume these are split phase rather than 3 phase controllers. Any chance of doing a bit of reverse engineering to see if these low cost circuits can be beefed up and used on an EV A/C motor? How many amps at what voltage does one have to expect using a 3 phase A/C motor in a ~3000 pound EV? Is split phase possible and/or easier to achieve? I realize with split phase initial motor amps to start would be rather high but maybe easier to implement in regards to timing 2 versus 3 phases. Or is it possible to design a poly-phase controller that uses say 6 or 9 even 12 or more phases just as easy as say a 3 phase device? My thoughts there would be a really low starting current required to start the motor moving using the multiple phasing and added effiency in the motor operation at higher speeds.

[roguethunder]

Originally Posted by justanothernoob

I am quite interested if there has been any further progress in the A/C controller. I was browsing through Ebay the other day and noticed there are "brushless" motor controllers capable of 200 amps for about 40 dollars + shipping. ...

Huh, would you mind linking to those? Most I could find for around there were 72v "45A" (peek... lol) 1.5KW (aka continous... which is around... 21A given the wattage) controllers of the sort.

XD Your questions are good that said. And I too am curious as to progress on this shiny project.

[justanothernoob]

Hello,

Well I guess I am not allowed to post links yet. Type in brushless motor controller in Ebays search box and several will show up. Specs I saw were 200 amps at 22.6 v. I hope this helps!

[MPaulHolmes]

Dang! The nice thing is, brushless and 3 phase motors can use the same controller, but with different software I think. I really want to do the 3 phase controller. It will be done soon.

[justanothernoob]

Hello Paul,

I was doing some research and was wondering if you have ever thought about the possibility of controlling a motor design like the Kawai? It seems like a very efficient design and rather simple to implement using some fairly common parts. He used a mechanical timing device but I do believe it could be done all electronically using todays selection of devices available. 0 back EMF and one could easliy add a 2nd stator ring/rotor magnet assembly on both ends to make a very compact and powerful motor design. Also the magnetic gap motors seem like they would be pretty easy to implement into an EV motor/controller setup using todays electronic controls as well. Just a thought to consider. Dennis

[roguethunder]

Originally Posted by justanothernoob

Hello,

Well I guess I am not allowed to post links yet. Type in brushless motor controller in Ebays search box and several will show up. Specs I saw were 200 amps at 22.6 v. I hope this helps!

Hmmm, found em. Too bad the voltage is so low on them... I doubt they could be adapted all that much higher without major effort and cost. Though... maybe if someone was aiming for say... An electric motorcycle. Might be able to do something like rig them up to a pair of fairly high amperage say ~24V motors... and get operational performance out of it pretty cheap.
... Not that I'm sure of any of said. But its what little comes to mind.

Originally Posted by MPaulHolmes

Dang! The nice thing is, brushless and 3 phase motors can use the same controller, but with different software I think. I really want to do the 3 phase controller. It will be done soon.

*drools*
And yeah, a lot of the 48-72V ~21A cont. controllers on eBay state they can work for either brushless or 3 phase. So that sounds right.

Edit: Particularly excited since I might actually have MONEY this fall to start a project xD...