Paul & Sabrina's cheap DIY 144v motor controller

[mrbigh]

Originally Posted by watt-a-mezz

Thanks Paul. Tried the HF Meter and I have it set at 200 Ohms. When I find ground it goes from 1 to 005-7. Is this what it is supposed to do? I am about
green as grass with electronics, Trying to learn. Appreciate the little parts. Will try to get the rest when I get the CB sorted out. Watt.

If you can't make head or tails about the assembly and or troubleshooting of your board (s), bring the assemblies to your local TV-electronic's repair shop and ask for help in debugging the boo boos you made. For a few bucks you will have everything professionally checked and corrected,; and probably a new friend for the future.

[watt-a-mezz]

Hi,All. Good news. I did find the ground plane, and the solder joints
read as 1. Found out what I needed by touching the probes together
which reads as a short. Learned something for sure. Good idea
to take it to a tv repair shop, but they are few and far between here.
Tvs are a throwaway item anymore. Watt.

[Weisheimer]

Originally Posted by watt-a-mezz

Hi,All. Good news. I did find the ground plane, and the solder joints
read as 1. Found out what I needed by touching the probes together
which reads as a short. Learned something for sure. Good idea
to take it to a tv repair shop, but they are few and far between here.
Tvs are a throwaway item anymore. Watt.

Hi Watt,

Have you seen that some of the folks in your neck of the woods are working
to get a formal EV group together?
Northeast Ohio EV Home Page
is the site to check. I'm sure someone would be willing
to help check that over with you. One of the fellows is
Rod Hower. I'm in Columbus and would be happy to help as well.
I get up to your area at least once a month.
It does sound like you are making progress, but nice to have
an option if you want it!

I've ordered the control board and MCU and expect to have it
sometime next week, so I'll be joining the fun!

Mark

[watt-a-mezz]

Hi Mark. Good to hear from another Ohio ev'er. Did attend a couple
of the meetings in Tallmadge. There was some interest in the "open
revolt" controler, maybe they will order a few. The control board isnt
too bad if you are familiar with electronics. I never have worked with
this stuff, I will be glad when it is done and operating! Good luck. Watt

[jackbauer]

Paul just thinking that as i'm running at 8mhz then all the timer loops in the micro are running at twice the intended delay. Will this effect things like the throttle ramp rate etc?

[mrbigh]

Originally Posted by jackbauer

Paul just thinking that as i'm running at 8mhz then all the timer loops in the micro are running at twice the intended delay. Will this effect things like the throttle ramp rate etc?

Jack, why did you switch from 16 to 8 KHZ micro speed? Shut-off time in the IGBT gates or else?

[dcb]

Didn't want to spend the $0.67 on a crystal and caps?

[MPaulHolmes]

Originally Posted by jackbauer

Paul just thinking that as i'm running at 8mhz then all the timer loops in the micro are running at twice the intended delay. Will this effect things like the throttle ramp rate etc?

Yes! hehe. But if you just set the throttle ramp rate to maybe 16 instead of 8, then it's all good. And you may want to double the Kp and Ki constants, but your motor is so freakishly big, that maybe you need small Kp and Ki.

I wish I knew why in the heck it wasn't working with an 8MHz crystal (DCB! hahahaha Jack's not that cheap! You are thinking of Scottish people! Just kidding Scottish people). I bet it's something simple.

[dcb]

LOL, Jack is very generous, I'm just kidding around of course

[jackbauer]

I found the igbt and freewheel were much happier at 8khz. My igbt is '05 vintage ex vfd. It did run at 16khz but i had problems with ringing at turn off. I just got an email from fran with v1.4 that , while untested , generates a 8khz pwm while running at 16mhz! Now I have the fun prospect of changing the crystal back to 16mhz while still in the car That said i'm building up another control board so may test it on that first. I'm running v0.9 in the car with great results i'd just like to be able to use newer versions of the code as it evolves. I don't know how or if the lower frequency would effect the mosfet design but mabey someone could run a test?