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

[thingstodo]

Originally Posted by thingstodo

What would you suggest as a 'foot off the pedal' value for the accelerator?

I think Paul said the range was 0.5 - 4.5V ... so maybe 0.6V? I'll try that and see if anything changes.

I tried 0.50V, power up, run, config, didn't bother to change the Kp and Ki and did run-pi-test. It never comes back

I tried 0.60V.

I tried 2.50V,

And that's it for tonight.

Lastly, I checked the 3 phase motor to make sure that it was still connected correctly to the controller. It is.

[thingstodo]

Originally Posted by MPaulHolmes

Zero is actually about 2.5v, since the throttle was configured as a wig wag. But I don't know what the state of the code is on the instructable. It may still be filler that I was going to get to.

Um .. I should have remembered that ...

And if I didn't remember it, I should have looked in the code.

I'm not using the code from the instructable, I'm still running the code that you/we loaded at your place. But I can't build it

[Astro]

Originally Posted by MPaulHolmes

Zero is actually about 2.5v, since the throttle was configured as a wig wag. But I don't know what the state of the code is on the instructable. It may still be filler that I was going to get to.

Not sure about the instructables code but the code i have has :
while (ADThrottle < savedValues.minRegenPosition || ADThrottle > savedValues.minThrottlePosition)

I remembered the minThrottlePosition but forgot about the minRegenPosition.
For testing i can see that wig wag type setup would work well.
For in vehicle use though holding the throttle at that mid point (2.5v) may be tricky.

I have been meaning to ask for a while about how the regen behaves.
When the throttle is in the regen zone if the car is rolling then the regen slows the motor and charges the battery.
But what if the car is stationary. If the throttle is in the regen zone then does it do nothing? Or will it cause a reversal of the motor direction?

[thingstodo]

Originally Posted by Astro

I have been meaning to ask for a while about how the regen behaves.
When the throttle is in the regen zone if the car is rolling then the regen slows the motor and charges the battery.
But what if the car is stationary. If the throttle is in the regen zone then does it do nothing? Or will it cause a reversal of the motor direction?

I do not have code snippets to back this up, but watching the video that Paul posted implies that the absolute value of the speed reduces. The regen will not reverse the direction.

Full regen at zero speed should do nothing.

[thingstodo]

Paul - I'm going to work on the larger motor (siemens AC motor) coupled to the warp9 with the built-in encoder on the AC motor. Let me know when you get the new combined code tested - hopefully on MPlab X - so I can do a built and use debug to see what is holding me out from continuing my testing.

Did you get a BOM written up for the new DC board? I can get parts ordered and start playing with that between working on the AC controller testing.

[MPaulHolmes]

OK, I'll install mplab x tomorrow. Which new DC board? Do you mean the driver boards?

At the moment, the throttle is configured so that the middle is zero throttle, and twisting the throttle one way makes the motor spin clockwise, and then twisting the throttle the other way makes the motor spin the other way. If the motor is spinning in any particular direction, and you twist the throttle to fight against the direction it wants to spin, it goes into regen mode. I need to add a couple lines of code so that you don't come to a stop at a stop light, and start driving backwards. haha.

[thingstodo]

Originally Posted by MPaulHolmes

OK, I'll install mplab x tomorrow. Which new DC board? Do you mean the driver boards?

If you have the time to install MPlab X, that would be great. If you check out your code on the older MPlab, I'll muddle around trying to get it to compile on MPlab X

I guess I meant the BOM for the driver boards. I think of them as a 'DC' board because that's what I was going to test them on first

[MPaulHolmes]

242 Meg out of 369Meg so far on MPLab X. Hopefully the install goes smoothly.

edit: Now installing compiler... I'm bored, so I figure I'd type here...20% done.. haha

[MPaulHolmes]

The "combined PI Loop tuning & AC controller code" compiled when I installed mplab X and the XC16 compiler. I didn't have to make any changes.

[thingstodo]

Originally Posted by MPaulHolmes

The "combined PI Loop tuning & AC controller code" compiled when I installed mplab X and the XC16 compiler. I didn't have to make any changes.

Great! Where can I grab a copy?