Search found 20 matches

by dcb
Apr 13 2018 3:21pm
Forum: Motor Technology
Topic: Buick Lacrosse 2012 e-assist moto-alternator
Replies: 152
Views: 18080

Re: Buick Lacrosse 2012 e-assist moto-alternator

I *think* with pmac it is more about field weakening (which can be done w/FOC), change the angle of the synchronized stator to push back on the magnets or something (which I think is why you can have more battery current than motor current in pmac, it is kind of a boost converter), and hope your con...
by dcb
Apr 12 2018 11:05am
Forum: Motor Technology
Topic: Buick Lacrosse 2012 e-assist moto-alternator
Replies: 152
Views: 18080

Re: Buick Lacrosse 2012 e-assist moto-alternator

do you have a CSV file by any chance? Motenergy ME115 I've not heard of a 115, it looks a bit like a water cooled me1304 though. motenergy has a me1304 72v graph which looks like about 12hp (at 140 amps peak). https://sep.yimg.com/ty/cdn/yhst-129399866319704/ME1304dynoplot.pdf from here: http://www....
by dcb
Mar 27 2018 5:56pm
Forum: Motor Technology
Topic: Buick Lacrosse 2012 e-assist moto-alternator
Replies: 152
Views: 18080

Re: Buick Lacrosse 2012 e-assist moto-alternator

first off thanks for all this vector, great stuff here. Very rare to see someone actually dyno. I've seen the AD2S1210, but would still be interested in what a $10 dual channel adc stm board can do (and I prefer software problems to high pin count smd and pcb manufacturer), though a simple encoder i...
by dcb
Mar 25 2018 8:41am
Forum: Motor Technology
Topic: Buick Lacrosse 2012 e-assist moto-alternator
Replies: 152
Views: 18080

Re: Buick Lacrosse 2012 e-assist moto-alternator

well I've got a function generator on the way, guess I will have to experiment. I get groups of 3 for poles, just not 10 poles. looking at: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?ResolverToQuadratureConverter taking the samples at fixed points in the excitation cycle makes a lot of sense, as does ...
by dcb
Mar 19 2018 4:58pm
Forum: Motor Technology
Topic: Buick Lacrosse 2012 e-assist moto-alternator
Replies: 152
Views: 18080

Re: Buick Lacrosse 2012 e-assist moto-alternator

I picked up one of these motors, is there a 10 pole resolvers for dummies video somewhere?
by dcb
Nov 20 2015 1:55pm
Forum: Battery Technology
Topic: 12s1p (~45v30ah) leaf LiMnO4 battery charger suggestions?
Replies: 7
Views: 505

Re: 12s1p (~45v30ah) leaf LiMnO4 battery charger suggestions

48v, 10a power supply, $50, comically large case for a bike: http://www.ebay.com/itm/400963671920?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT did some initial tests with this, have not got the built in current limiting working, so that is a problem, also it cannot stay connected to t...
by dcb
Sep 27 2015 2:26pm
Forum: Battery Technology
Topic: Charge a 36v4.4AH pack with another 36v4.4AH pack?
Replies: 5
Views: 476

Re: Charge a 36v4.4AH pack with another 36v4.4AH pack?

you have a hoverboard, and my "invention" is too complicated? ;)
by dcb
Sep 27 2015 12:54pm
Forum: Battery Technology
Topic: Charge a 36v4.4AH pack with another 36v4.4AH pack?
Replies: 5
Views: 476

Re: Charge a 36v4.4AH pack with another 36v4.4AH pack?

you need a way to transform it without a lot of power loss (i.e. buck converter). With a boost converter you could go the other way as well, but the boost (or buck) becomes the limiting factor then. You might be able to set up a pack that has a slightly higher voltage, i.e. where its discharge volta...
by dcb
Sep 21 2015 11:32pm
Forum: Battery Technology
Topic: 12s1p (~45v30ah) leaf LiMnO4 battery charger suggestions?
Replies: 7
Views: 505

Re: 12s1p (~45v30ah) leaf LiMnO4 battery charger suggestions

I hear ya, the limn2o4 is pretty safe chemistry, mostly don't want to overcharge it because it shortens the lifespan. And I don't leave freddy alone for long. The 48v supply doesn't have sense wires so it will err on the side of less power to the battery by default. Whatever I sort out to control it...
by dcb
Sep 21 2015 8:52pm
Forum: Battery Technology
Topic: 12s1p (~45v30ah) leaf LiMnO4 battery charger suggestions?
Replies: 7
Views: 505

Re: 12s1p (~45v30ah) leaf LiMnO4 battery charger suggestions

Thanks for the replies! fwiw, I dug up some "freddy charger" bits out of the garage for now (manual bottom balanced first). I'm gonna take a stab at shutting one of these off with a microcontroller or something: 48v, 10a power supply, $50, comically large case for a bike: http://www.ebay.com/itm/400...
by dcb
Sep 20 2015 2:35pm
Forum: Battery Technology
Topic: 12s1p (~45v30ah) leaf LiMnO4 battery charger suggestions?
Replies: 7
Views: 505

Re: 12s1p (~45v30ah) leaf LiMnO4 battery charger suggestions

was hoping to use 4v/cell (ok, 4.02) as an approximation of 80% ish charge (good for cycle life), so 48v was the desired termination resting voltage, 4.1v would still be conservative enough for me though, so 49.2 at most if you got it. 115v source. 4.2 is asking for cell degradation IMHO. 1200w max ...
by dcb
Sep 19 2015 4:35pm
Forum: Battery Technology
Topic: 12s1p (~45v30ah) leaf LiMnO4 battery charger suggestions?
Replies: 7
Views: 505

12s1p (~45v30ah) leaf LiMnO4 battery charger suggestions?

Hi all, anyone using 3 leaf modules modded for 12s1p and know an inexpensive charger to use? the greenworks appears to stop at 13s.

120v input, 4 to 25 amps output, automatic shut off, shut off at 80% preferred (48v cv).

Thanks!
by dcb
Mar 10 2015 5:19pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: A1Mo-Gen/DC motor...Aprilia RS50 build
Replies: 3
Views: 676

Re: A1Mo-Gen/DC motor...Aprilia RS50 build

This one can do overunity (if you have the golden touch) :/ www dot energeticforum dot com/271235-post61.html Y'all been warned. for the uninitiated, overunity folks think they can get more energy out of a motor than they put in. kinda violates the law of thermodynamics, but they make a lot of crazy...
by dcb
Oct 02 2014 9:34pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: 40kw E-Taljet Dragster. Thoughts?
Replies: 43
Views: 5125

Re: 40kw E-Taljet Dragster. Thoughts?

I just wanted to weigh in on the cvt stuff while I was thinking about it. Using weights and springs and helixes to program your transmission ratio is like using a carburetor in a sea of fuel injectors, only many times worse. You need something like a throwout bearing to control the ratio (and maybe ...
by dcb
Sep 23 2014 11:14pm
Forum: Battery Technology
Topic: Nissan Leaf Cells Test Data
Replies: 383
Views: 73434

more leaf battery fun

I thought I'd share this reconfiguration to 15v, hoping to get these three modules wired to 45v for a 4hp scooter project. connected "internally" with a couple lengths of 6 gauge, 4 or two would be better, but you might have more patience than me (trial and error). plastic cover still kinda fits aft...
by dcb
Dec 05 2012 9:30pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: 6 phase hub motor?
Replies: 16
Views: 12526

Re: 6 phase hub motor?

yes, old thread, I know I know. I *think* 6 phase is the same as 3 phase if you use 6 poles instead of 12. If you were to use all 12 poles in the above picture the resolution change, the potential improvement in smoothness, and power transfer would be more obvious, though I don't really know what th...
by dcb
Nov 12 2012 9:46am
Forum: Motor Technology
Topic: coasting (vs complexity) sepex vs pm brushed
Replies: 6
Views: 614

Re: coasting (vs complexity) sepex vs pm brushed

I think the cogging is a bit of a red herring now that I look into it, it would not be noticable if the poles were not ferrous, the issue really is eddy currents (a magnet passing by a conductor). I would be looking at an EMC-ME0909 (or two) if I went pm, so how many hp does it take to spin a discon...
by dcb
Nov 12 2012 5:53am
Forum: Motor Technology
Topic: coasting (vs complexity) sepex vs pm brushed
Replies: 6
Views: 614

Re: coasting (vs complexity) sepex vs pm brushed

There is the cooling fan too. It would be simple enough to bolt on an electric blower and temp controller and remove the internal fan. But I don't know if there is much energy to recapture there, though certainly there is some if you only cool as needed independant of rpm + improved coasting. I migh...
by dcb
Nov 11 2012 10:25pm
Forum: Motor Technology
Topic: coasting (vs complexity) sepex vs pm brushed
Replies: 6
Views: 614

Re: coasting (vs complexity) sepex vs pm brushed

hmm, wonder if looking at a common unversal motor would give me a clue (i.e. take the motor out of a 120v drill and see how it spins). I do recall at the local science store a magnetic device that slowed down a penny when dropped, probably something like that going on in a pm motor as well as coggin...
by dcb
Nov 11 2012 9:55pm
Forum: Motor Technology
Topic: coasting (vs complexity) sepex vs pm brushed
Replies: 6
Views: 614

coasting (vs complexity) sepex vs pm brushed

Hi, I'm thinking through a KISS ev conversion for a motorcycle. regen seems complicated (and not as efficient as coasting) so I want to focus on being able to coast well, but would like to leave out the mechanical freewheel/sprag clutch if the motor will freewheel on its own well enough. Do PM motor...