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A200S 16S 200A

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TechAUmNu
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The V2 version is now up for preorder on my site http://teamtriforceuk.com/a200s-v2/ at £250 each.

Order goes in on 18th February, boards back in 3 weeks from then.

 

 

thewho
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I have a bunch of 5s lipo packs so I´d love a version that could take 20s so I could get the speed up a bit on my bmx bike a bit. Any plans for something like that?

I guess the shunt amplifiers are the limiting components in that case?

TechAUmNu
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Yeah the size goes up a lot once you go over 75v, as you either need isolated shunt amplifiers or hall sensor based ones.

Here is a quick video of testing I was doing the other night.

 

strelokvc
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Very interesting project!
Tell me please, are you planning to manufacture ESC operating at 30S (126V) at 270A? I need about 35kW of maximum power on my engine.

Watching the project!

TechAUmNu
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I would like to do a higher power version soon, but not got time to work on one for a while.

district9prawn
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Ha 40% saturation compensation. What happens without it? Lose tracking at high current? 

Is it any better if you enter a lower inductance value. 

TechAUmNu
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I actually managed to turn that back down to 0. I think it was because I was trying to start at 200A in current mode, it works fine if I increase the throttle slowly using a remote and ppm app.

district9prawn
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I tried the new 3.48 firmware on my v1.3 board but unfortunately it still locks up above 40khz switching frequency. On v6 hardware 60 khz worked great but it can't be good for the drv.

TechAUmNu
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That's weird... how could different hardware cause it to lock up.

TechAUmNu
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Also where did you get that firmware?

district9prawn
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The bin files in the new vesc tool. Sources aren't up on github yet.

I'm pretty sure the stock 75/300 file on 3.48 is built for 0.00005/3 shunt, 20v/v current sense amp and 2.2k/56k vsense divider if you want to play around. I'm using 22r gate resistors so the dead time was surely wrong. Low speed sensorless was rough and startup was poor.

 

TechAUmNu
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Yeah I use all the same values as 75/300 So can use that file. Although I sent out the prototype to be tested on a low inductance motor. So can't try it out.

district9prawn
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Derp. I had sample in v0/v7 disabled on my v6 which let it switch faster but with the current control loop running at half fsw. So no, the new firmware can't run the current control loop any faster than the old. We just assumed it could =.=. 

Pretty sure this is what Benjamin has done in his 75/300 video to get higher pwm frequency.

TechAUmNu
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Ah that makes sense. I guess you could probably hit 70kHz then with that off.

district9prawn
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Yes pretty much exactly double the limit with sample in v0/v7. Pwm frequency is actually half with the vesc so at 100k erpm you get about 20 pwm pulses per electrical revolution. 

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