Search found 168 matches

by Mesuge
Wed, 01 Apr 2009, 02:41
Forum: General EV Discussion
Topic: Finnish project - volume order AzureD
Replies: 0
Views: 448

Finnish project - volume order AzureD

From the depths of the internets comes this project, basically group of EV fans in Finland came up with the idea to make ~500x Corolla conversions based on the same e-drive train technology. This includes some sort of deal on the hardware, volume order by the group should push the price a bit lower,...
by Mesuge
Sun, 29 Mar 2009, 04:23
Forum: General EV Discussion
Topic: Factory backed EV to hit NZ
Replies: 8
Views: 837

Factory backed EV to hit NZ

The trick is the separator used inside these batteries, even LiCo chemistry could be made relatively safely..
by Mesuge
Fri, 20 Mar 2009, 05:18
Forum: Technical and conversion discussion
Topic: Prius Plugin
Replies: 10
Views: 1691

Prius Plugin

Well, perhaps take as point of departure the exact segment/needs of your future/desired car. Prius is in fact midsized - bordering on big 5seats sedan type of car. It's heavy even without the hybrid drivetrain installed, one of the magics is "good" aerodynamics and low roll pneu/wheels. Now to have ...
by Mesuge
Tue, 17 Mar 2009, 02:35
Forum: Electric motors and controllers
Topic: ac pm motor starting
Replies: 23
Views: 3585

ac pm motor starting

V12 is for use on our front lawn, for when the grid power goes off. Or any Friday / Saturday night that things are a bit quiet according to Andrew. lol http://forums.aeva.asn.au/smileys/smiley4.gif Seriously, this is very interesting project you are doing for the university, I gather that the 1/10 ...
by Mesuge
Sun, 15 Mar 2009, 06:26
Forum: Members Machines
Topic: Red Suzi
Replies: 217
Views: 52980

Red Suzi

Tuarn, any milestones ahead for your Suzi, first 1 000km or 5 000km on the same Pb batt. pack? Pls. keep us in the loop Image
by Mesuge
Sat, 14 Mar 2009, 01:52
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

Richo, has anyone established the price tag on this puppy so far?
It looks dangerously similar to ACP/Tesla emotors..
by Mesuge
Thu, 12 Mar 2009, 11:45
Forum: Members Machines
Topic: First drive of industrial ac hilux
Replies: 60
Views: 8211

First drive of industrial ac hilux

Mal, I've already dispatched congrats via your blog, amazing progress indeed, pls. keep us updated with more performance data/statistics and perhaps even more/detailed videos as your time allows. Thanks
by Mesuge
Wed, 04 Feb 2009, 06:23
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

Thanks for the reply, we follow the same train of thought so far regarding the variable torque input as the master control unit for this setup. However, two very efficient(~95%) differentials working together will be <<90% efficient for the entire vehicle, right? Also, I doubt you can switch to 50:5...
by Mesuge
Wed, 04 Feb 2009, 02:28
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

For instance, in daily city driving the variable power distribution would be more economical than say "drag racing" or "sporty" or "flood/snow" 1:1 setup. Also it's easier to source "small" 2x VFDs than one ~150kW giant..
by Mesuge
Tue, 03 Feb 2009, 15:35
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

You have them on the same shaft, or one driving the front wheels, one the back. Run them both off the same throttle input. I thought the combined torque and power curve of the two systems will be a nice compromise. Haven't done the numbers completely yet, but: Flat torque until the 4 pole hits volt...
by Mesuge
Sat, 24 Jan 2009, 06:16
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

According to his latest post, MG_Kermit fried his VFD (two IGBTs) most likely due to prior removal of the DC bus capacitor bank. He blames the (unaccounted for) increased inductance of wiring+batt. pack going directly into IGBTs..
http://kermitthecar.blogspot.com/2009/01/snubbed.html
by Mesuge
Sat, 24 Jan 2009, 05:41
Forum: Batteries, charging, management and monitoring
Topic: Home grown BMS ideas !
Replies: 781
Views: 111693

Home grown BMS ideas !

Tuarn, I think you are musing in the right direction. Just look at the AC bigboys, for instance ACP/eBOX frontend seems to indicate they data log only subpacks performance and possibly the highest/lowest VDC cell as an outlier, which should be enough to detect/service any problem with the cells/enti...
by Mesuge
Wed, 21 Jan 2009, 03:10
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

I'm not sure if I get the idea from latest posts, please explain for us slow brained, 690VAC VFDs are usually x-times bigger than 380-500VAC, also many industrial manufs. start at higher output power for these like >400kW. This doesn't seem as much practical for diy, unless you want to electrify you...
by Mesuge
Tue, 20 Jan 2009, 15:20
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

Would you pls. verify this part of efficiency/energy losses chain, i.e before ... gearbox/tires/drag/... and the rest of it. Assume full power/load under max. accel. scenario (few seconds): Batt. pack/ESR/TS40@5C (~25%) -> Wiring (* %) -> VFD (97%) -> Wiring (~4.5% combined*) -> ACIM 18.5 3000RPM (9...
by Mesuge
Tue, 20 Jan 2009, 08:38
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

Antiscab> thanks for confirming this observation, however this probably holds true for non-climatized pack only, pls. define warm, is it much more >25°C in your book? Woody> M3AA 131 316 looking good, but what we loose in the top, max. load/torque RPMs band in comparison to 4D>2D, how many hundreds:...
by Mesuge
Tue, 20 Jan 2009, 04:31
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

Woody, I recalculated your ouput for that BMW example on previous page in my more humble spreadsheets and you seem to be spot on in terms of ESR <30% (perhaps plus some unaccounted small % of wiring losses). However, I think that abusing 704VDC nom. /TS40Ah pack in ~5C for long 7-20sec repeatedly, i...
by Mesuge
Mon, 19 Jan 2009, 17:26
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

This is likely topic for another thread but are there any positive outcomes from the hybrid packs (high discharge/continuous), for instance say EVPST/TS, Polymer/TS or capacitors/TS, and/or other combinations? Some experiments have been posted in the past (other forums or science projects) but nothi...
by Mesuge
Sun, 18 Jan 2009, 02:47
Forum: Electric motors and controllers
Topic: AC Tuning
Replies: 27
Views: 3997

AC Tuning

a4x4kiwi wrote: The motorbike in the video was very timely.


Congratulations, looking very smooth.

Btw. this is at least second EV related video this week with similar
"Attack from the planet ICE" soundtrack, I think they do it on purpose..Image
by Mesuge
Sat, 17 Jan 2009, 03:07
Forum: Batteries, charging, management and monitoring
Topic: Home grown BMS ideas !
Replies: 781
Views: 111693

Home grown BMS ideas !

woody wrote: Same site has links to about 15 differnet BMSes available, in progress.


Apart from BMS and his MiniEV build, there are couple of interesting CANbus links as well (lower folder level).
http://carrott.org/cgi-bin/twiki/view/BMS/WebHome
by Mesuge
Fri, 16 Jan 2009, 09:39
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

Re: air v. water cooling preferences, fair enough. But we're the creatures from the water planet afterall http://forums.aeva.asn.au/smileys/smiley33.gif Re: rewind induced losses, yes this is likely the less prominent parameter among the other listed (gradebility, several consequtive stop&run cycles...
by Mesuge
Fri, 16 Jan 2009, 07:37
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

Yes, sorry, it gets a bit confusing here, I'm talking about the rewind setup - in fact THE topic of this thread as nicely summarized in Woody's second post from the top on this page - you are now talking about your current stock unmodded 415V motor and Dan VFD combo, right? But as mentioned before o...
by Mesuge
Fri, 16 Jan 2009, 06:12
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

Ok, but the context we are talking here is about 230V delta (rewound) on 415VAC VFD: <6x overload (kW) and <3x overload (Nm) on aircooled thingy.. Be it just for a few seconds in the top overclock range, the temps and overload peaks will be an issue to some degree (hopefully manageable) in the real ...
by Mesuge
Fri, 16 Jan 2009, 04:33
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

While ACIMs are designed to be operated in servere conditions, their operating limits may be exceeded by a long steep hill climb. Retaining the gearbox maye be needed so that the climb can be done at a lower gear, keeping the torque within the motor's capability. Say, 10% grade, 3.9:1 diff, 600mm d...
by Mesuge
Thu, 15 Jan 2009, 19:49
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

Yes, I meant mainly the first 2pages of this thread and the basic idea rewinding for 230V delta on 415VAC vfd, no torque boost magic (ordinary vfd), "~5.3x overclocking," seems too good to be true. Woody thanks for the reply. btw. I'm worried will this hackenstein work out of the box in all the mode...
by Mesuge
Thu, 15 Jan 2009, 15:55
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 66722

AC motors, multipoles, torque

Here is a comparison between an ACIM and the std BMW 318i E30 motor. http://forums.aeva.asn.au/uploads/274/BMW_ICEvEV.JPG The ACIM would be a 11kW 4-pole 132-frame Tn=72Nm Tm=2.9xTn=209Nm. Except it is rewound for around 200V. So it can be used up to 2 x sync freq (3000RPM=22kW) It would weigh abou...