Paul & Sabrina's cheap DIY 144v motor controller

[jyanof]

Originally Posted by bones007

I have a question about pre-charging the controller. Is there any reason why we shouldn't just put a resistor in parallel with the main contactor and just leave it there. If we do so then the controller caps will always be charged up and there is no need to wait some time before closing the contactor.

Aside from the other reasons mentioned above, I think an important reason is to protect the controller during charging. My 144V pack will reach 183V during equalization. While everything in the controller is rated for 200V, there's no need to expose it to high voltage. A capacitor's voltage rating can decrease with age. A malfunctioning charger can push the voltage past your set point. If your charger isn't isolated, voltage spikes from the AC line can fry your controller components too.

so, overall it's a cheap way to avoid some failure modes while making things a little safer.

[jackbauer]

A new era of testing begins

[MPaulHolmes]

holy cow. Holy cow!!!!! On a separate note, I watched the Secret of Roan Inish yesterday. IT was really good.

[jackbauer]

It gets better

This is a shot of the gate emitter of number 4 igbt. I think i had the coupling set wrong. Not bad for a "cheap" scope

[dave koller]

Originally Posted by MPaulHolmes

holy cow. Holy cow!!!!! On a separate note, I watched the Secret of Roan Inish yesterday. IT was really good.

Ah, now do you believe in Selkies Paul?

[MPaulHolmes]

hahahaha yes! I believe! I also believe that little boy would have sunk in his little raft if he got much older! hahahaha

I'm almost ready to test the bms and charger! super super super close!

[jackbauer]

I promised Adam i'd hook the logic analyser up to the controller. Quite tedious but i got there. Still don't quite know how to use the thing!

Also did a few measurements using the new dso on the 1000amp controller. Noticed some ringing at over 500khz measured across the switch. hmmmm .....

I like old style test gear. Nothing like hearing the big fans running up to speed and waiting for the display to warm up! These days its all colour oled displays and fancy self tests. Not the same

[dave koller]

Originally Posted by jackbauer

I like old style test gear. Nothing like hearing the big fans running up to speed and waiting for the display to warm up! These days its all colour oled displays and fancy self tests. Not the same

LOL - Been there squinting at the CRT to say "was that a glitch?" ....

[ludiagsm]

hey today i have first test run on 48 volts in the beginning i have 30km/h on second gear and after that 38km/h on 3-th the batteries was't charged properly but after 2 km ride i tried to take this video :

http://www.youtube.com/watch?v=jiNtPZCV7z0

[ludiagsm]

It seems that i need different setup those 6 inch motors are very weak ,i need to bay powerful one 9 or 11 inch like those AC motors, DC motors, Grinders - Kostov Motors