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

[MPaulHolmes]

Originally Posted by mitsui

1.I have Lem La 100-p current sensors at hand and these things require +-15V supply voltage.If I connected these to the circuit with 5v and ground would they work like yours?(like 2.5V at 0A and ~5V at max current)
If not is it possible to make an external circuit that will make the sensor reading the same format with it?

Maybe with some op amps you could do a level shift and scale of the -15v to 15v output to 0-5v.

Originally Posted by mitsui

2.Is it possible to replace 5x22uF MLCC ripple smoothing capacitors feeding bjts with single 100 uF electrolytic aluminum-tantalum ones with the polarity in mind or would reverse transients blow up these ones? If it is possible what were the reasons for choosing 60 pieces of relatively expensive capacitors?

This is a very severe environment for caps. Like 8 or 12amp pulses. Must be super low ESR. You might be able to get away with an electrolytic if it is low ESR and rated for 105degC and you keep the pulse current low by using a large gate resistor (10 Ohms or more). But in that case, you can skip the whole boost stage and just use the 2.5amp drive from the white fod8316.

Originally Posted by mitsui

3.If I supplied the dc bus voltage from a rectified high power 3 phase transformer with no ground connection and 24V from AC-DC converter fed with same grid would it cause a isolation & short circuit fault?

rectified 3 phase would probably work pretty well since it's low ripple by nature. Generally AC-DCs are isolated, so you should be fine.

[MPaulHolmes]

Originally Posted by thingstodo

AWESOME! If you would like someone to critique/comment on the instructions - I am available!

Paul - what do you say to an official release version number? Change the firmware from 1.00 to .. 1.1? 2.0? Make no other changes and post the source and executable, schematic files, etc on your web site?

Do you have a revision number for the instructions? Maybe 2.0?

That sounds like a good idea! It's so hard to commit sometimes because I'm always adding something. Let's say 1.1. haha.

[Thalass]

So I've been following this thread for a while, and while I hate to admit it many of the details have whooshed right over my head. So can I ask what the overall status of the project is right now? It sounds to me like you're close to a produce-able design?

[MPaulHolmes]

Yes, I just submitted a surface mount board that is all one sided, so I could assemble it at home much faster than the other board. I'm planning on saving up for something like this:
http://www.liteplacer.com/

I think I'll then stick the soldered board on the website my wife made. Completed controllers would probably be more popular. I just don't want to get sued. "Bill was driving down the road, and crashed into a little old lady. He claims that none of his extensive modifications were related to the cause of the crash. You are going to jail!"

[WindyDrew]

Originally Posted by MPaulHolmes

Yes, I just submitted a surface mount board that is all one sided, so I could assemble it at home much faster than the other board. I'm planning on saving up for something like this:
LitePlacer | The Low Cost Prototype Builder's Pick and Place Machine

I think I'll then stick the soldered board on the website my wife made. Completed controllers would probably be more popular. I just don't want to get sued. "Bill was driving down the road, and crashed into a little old lady. He claims that none of his extensive modifications were related to the cause of the crash. You are going to jail!"

Set up an LLC, they're cheap!

[jackbauer]

I just built one of the resolver to encoder boards that Paul kindly sent to me. Will be testing it out on a Lexus GS450h motor tomorrow. Plan to build one of these controllers as soon as I get a PCB from Paul

[MPaulHolmes]

There were a few things to look out for that just involved swapping cables (sin+ and sin-, cos+ and cos-. I think I had it cos- and cos+), and also a few settings so that the index pulse happens when QEA is high. With my regular encoder, I could do "index pulse must happen when QEA is low" in the configuration at the start of the program. But with this, index very rarely registered with that setting, so I had to do index pulse happens when QEA is high, and then it was totally glitchless. So, if it acts a little weird at first, just know that some such thing could be lurking in the shadows, but they aren't serious.

[jackbauer]

the Lexus gearbox motor loves the Paul resolver board worked straight out of the box. Now if I just had those controller pcbs.....

[MPaulHolmes]

HURRAAYY!!!!!!!

They will be here in a couple weeks. sorry about the delay. To get them made cheap(er) (still really expensive) I do a long manufacturing time (4 layer). But they let me fix the silk screen so now the one mistake on the board (silkscreen mirror on 2 parts) is fixed. I also ordered some other boards set to 12 days, so sometimes what they do over there is ship the 18 day boards with the 12 day boards to save them shipping. So, it might be here in like 10 days instead of 15 or whatever.

[Thalass]

Awesome! Does the controller have a communication bus or something? I am interested in keeping 4WD on the subaru I want to convert, having two motors would be neat.