BLDC Driven Paxton

[golgothapro]

I've been running a Paxton Novi 2000 at around 1:3 with a 2 1/2" 8mm belt-drive off a Me 0913 72vdc 250 amp BLDC in my 87" Camaroe with a .060 over smblk 350 for years. It makes 8 psi w.o the engine running with a 300 amp initial surge and selltles to about 160 A while operating. Typicall the duty cycle is less than 15 seconds. I power it with six 40 -50 ah AGMs in series. Two where each back seat use to go, and two in the trunk well. I can charge them on the fly with six cheap 2A smart chargers plugged three each into a couple of 1.5K inverters that are powered from a second aux electrical system. . I started back around 02' when I saw my first LEMCO PM motor displayed at a trade show for amusement rides on a go-cart frame. It was 36v and about 10 hp yet made only a couple of lbs. next I went to a 72v 12 hp Lemco D-127 and got 4lbs, and then I discovered three phase Me 0913 BLDC. If I upgrade I plan to try one of the new axial flux motors because I think they show the most promise to date. Most people underestimate how much power it takes to pump under pressure. Had I known from the beginning I probably would have never even tried. That blower that comes on the Hellcat takes 60 hp off the crank for about 8 psi according to a factory video i saw on it. That's a hellova lot; however, I think that much power might be possible to obtain now with axial flux motors because they can be stacked. The biggest drawback is battery power and life vs weight. All totalled my blower unit (mounted on the sway bar directly in front of the engine) weighs in at around 100 lbs and the batteries almost a couple of hundred more. It doesn't matter for a vehicle on a roll, (I can rule on the interstate); but for drag it's a drag and LiPOs are still too expensive if you ask me. The less the ah of the battery, the less time they last before they have to be replaced. Also I think it's a good idea to have voltage indication of each (I use cheap $3.50 tiny digital ones off Ebay) so I can make sure I have max voltage before each hit because it makes a dramatic difference in the output. I activate with chargers on. Thing is, with traffic being what it is now in Kissimmee FL, I rarely have an opportunity where I really need it.

 

[cmoalem]

Welcome to the forum ... nice to have you here with all of your experience.

Since 2002 ... wow ... I bet the log book of your journey fills a LOT of pages, not just the very interesting intro post.

Looking forward!
(and yeah, having enough ah with high enough discharge rate to power a street driven all day use blower setup has perplexed me as well. A smart on board charging with high enough charge rate is needed to actually keep the batteries as energy buffer topped up "at all times" ... broblem is the ratio/duty cycle for the blower motor vs the charge rate and time ... but lets discuss further at a different thread)

 

[AlexLTDLX]

Thanks for joining! As I've said on youtube, I've run across your project in the past. I really do think it's worth re-visiting the battery issue in your case. With some careful shopping on ebay, you can now find some flavor of lithium batteries for relatively cheap, a lot lighter and with at least 10x the life of the AGM batteries you're using now. Though I COMPLETELY feel your pain about the traffic issue. I live in the DC area, and I rarely even drive my car anymore. The roads are parking lots filled with people who really shouldn't be driving. A good commute to work for me (14 miles each way) is an hour and fifteen minutes in and an hour and forty five minutes back home. That's why I'm moving in the next year or at the most two to a small coastal town in Texas with a population of under 10,000. We should discuss your setup in the main forum. Can you post up a thread with pics and details of your setup? A Novi 2000 is a nice blower.