Search found 168 matches

by Mesuge
Tue, 14 Jul 2009, 08:44
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 28785

Hemonster's ACIM conversion

Speaking of cylindric cells, one of the most underestimated problems is the correct vibration free mounting, especially the early adopters in EV bikes destroyed many packs by too much force applied on the contacts. Here are some clever hints how to approach building a better frame-pack: http://www.e...
by Mesuge
Mon, 13 Jul 2009, 07:34
Forum: Electric motors and controllers
Topic: Changing an induction motor voltage
Replies: 433
Views: 111841

Changing an induction motor voltage

Hang on, mesuge, are you confusing vibration frequency with operating frequency ? Exactly, that's the single line question I should have asked in the first place (ohh the joys of foreign language), I'm not sure and it makes more intuitive to derate the drive in step with higher operating freq. but ...
by Mesuge
Mon, 13 Jul 2009, 07:17
Forum: Electric motors and controllers
Topic: Changing an induction motor voltage
Replies: 433
Views: 111841

Changing an induction motor voltage

As I mentioned I hate to place a tangent topic and pls. correct me if I'm completely off base here but this thread is also about running ACIMs at <200Hz, right? Now, I'm confident we don't have to start debate about the automotive grade electronics/case design v. stationary & indoor use only of indu...
by Mesuge
Mon, 13 Jul 2009, 06:53
Forum: Electric motors and controllers
Topic: Changing an induction motor voltage
Replies: 433
Views: 111841

Changing an induction motor voltage

OK, pls. allow for one little tangent here, do you guys realize that industrial VFDs are quite sensitive to G forces, I've noticed in several spec sheets by different vendors that after >60Hz it goes to hell (like <<<0.5G only), so upper 60-200Hz territory will be funny for the longevity prospects o...
by Mesuge
Sun, 12 Jul 2009, 23:07
Forum: Electric motors and controllers
Topic: Changing an induction motor voltage
Replies: 433
Views: 111841

Changing an induction motor voltage

But as I'm saying to weber.... were talking a few % change, however, I'm looking at the *(x4 or x12) magnitudes ! In terms of the "big guns" did you attempt to *pre-consult the specific model selection with your "contact" at ABB for this goal, or are you just going completely experimental route to ...
by Mesuge
Sun, 12 Jul 2009, 10:17
Forum: Electric motors and controllers
Topic: Changing an induction motor voltage
Replies: 433
Views: 111841

Changing an induction motor voltage

ACmotor> How do you define your peak: 150% 60sec or 200% 2sec? :@ ) Are you talking about that Delta's VFD-VE (0-600Hz) range in E1 frame size (catalogue: 370x595x260mm@50kg, no braking transistor built-in; only upto C framesize, for >D available as optional external box)? Looks quite similar to the...
by Mesuge
Sun, 12 Jul 2009, 06:18
Forum: Electric motors and controllers
Topic: Changing an induction motor voltage
Replies: 433
Views: 111841

Changing an induction motor voltage

Tuarn, nice test & write up! Looks promising for 11kW if specific suitable ACIM model can be found and similar wiring undertaken. However, we are still missing affordable 80-100kW (peak capable) inverters for this kind of setup. Nobody even bothered to replicate that fully documented microchip 100kW...
by Mesuge
Sat, 11 Jul 2009, 06:24
Forum: Members Machines
Topic: Camira Conversion
Replies: 33
Views: 6061

Camira Conversion

Hi John, you developed some very interesting projects. I'm wondering about your long experience with Piktronik programmable charges, so the shift from Pb to Li-ion batts. was uneventfull in that regard? I've got one smaller Piktronik for assisted bicycle but only since mid 2007 and so far so good. T...
by Mesuge
Thu, 18 Jun 2009, 07:33
Forum: Electric motors and controllers
Topic: Changing an induction motor voltage
Replies: 433
Views: 111841

Changing an induction motor voltage

What perhaps has not been stressed in this thread is the question of efficiency when rewiring/using smaller drivetrains based on the industrial platform (we briefly debated it in the AC drives thread). For instance 7.5kW motors are <<90% efficient, wtf? even Prius has got 98% inverter and >>90% emot...
by Mesuge
Thu, 18 Jun 2009, 06:54
Forum: Electric motors and controllers
Topic: ABB motor and VFD selection
Replies: 74
Views: 16177

ABB motor and VFD selection

Hi e-Ghia> Good approach, that's an idea to consider: ABB motor + VFD combo => demand discount! Obviously the pricing for this brand is on the expensive side. Here is some "fly by night" pricelist not sure whether this is the factory one, which is usually shaved a bit off at the dealers.. http://www...
by Mesuge
Thu, 04 Jun 2009, 08:42
Forum: For Sale/Wanted
Topic: REGEN in now available in all sizes
Replies: 18
Views: 1326

REGEN in now available in all sizes

Goombi> did you ever open the case of that chinese sepex controller and/or motor for inspection? To have reliable sepex system in higher voltage (>100V) with decent power output is not that easy, that's why there are few/none on the market suitable for the diy conversion scene.. And the "quality" br...
by Mesuge
Sat, 30 May 2009, 02:58
Forum: Members Machines
Topic: Proton Satria (Kim Ryan)
Replies: 21
Views: 5017

Proton Satria (Kim Ryan)

I have also removed the gearbox and now the vehicle is direct drive via the front wheels using a RAV4 rear diff @ 3.1:1 ratio. Vehicle Specs: 1997 Proton Satria Motor: Chinese 9.5" , 8.5kw cont 80kg Controller: Curtis 1221C Batterys: AGM 85ah Charger: Chinese 15amp pulse charger Performance: 0 to 6...
by Mesuge
Wed, 15 Apr 2009, 04:25
Forum: General EV Discussion
Topic: Red's Go Green
Replies: 31
Views: 2899

Red's Go Green

The BYD's range estimates sounds like from 10-15 japanese driving cycle certification or similar (<<50km/h), so much less demanding than american EPA/DOT or NEDC cycles in the EU which are more realistic with good portion of highway passage and thus higher score/lower range. We can estimate what can...
by Mesuge
Sat, 11 Apr 2009, 07:56
Forum: Members Machines
Topic: Weber and Coulomb's MX-5
Replies: 1698
Views: 334117

Weber and Coulomb's MX-5

Yes, according to "Parker SSD/Eurotherm" VFD manual, there is defined limit of 750VDC for the DC bus, so 208x cells @ 3.6V, allowing for regen safety overhead looks reasonable, also there might be hidden few % extra as safety margin beyond that in the drive. Btw. I think only the Danfoss brand can g...
by Mesuge
Fri, 10 Apr 2009, 09:15
Forum: Members Machines
Topic: Weber and Coulomb's MX-5
Replies: 1698
Views: 334117

Weber and Coulomb's MX-5

Hm, just realized that these UK made "Parker SSD/Eurotherm" VFD drives, when fitted with comm., cloose loop, and breaking boards are not that much competetive anymore to the other brands we discussed in the AC thread. I'm talking about the power range of ~45kW nominal. Perhaps for your higher output...
by Mesuge
Wed, 08 Apr 2009, 03:09
Forum: Electric motors and controllers
Topic: motorcycle class hub motor
Replies: 5
Views: 1866

motorcycle class hub motor

Very interesting project, Mark said he is also developing his own controller (half the price of Kelly's) for the moto hubmotor kit, also page #9 reveals some "secrets" as Todd Kollin advised him to perform one time only/first parallel charge of LFP/TS batts., that way they are suppose to stay in bal...
by Mesuge
Sun, 05 Apr 2009, 03:57
Forum: Batteries, charging, management and monitoring
Topic: Battery Chargers
Replies: 9
Views: 3080

Battery Chargers

There are some CTEK clones (Made in PRC?) floating around, google is your friend. There has been actually some comparison tests performed between those and all was ok, if I remember correctly. Btw. for individual charging method you need at least 3stage type of charger (not 2!), i.e. including some ...
by Mesuge
Fri, 03 Apr 2009, 04:05
Forum: General EV Discussion
Topic: Red's Go Green
Replies: 31
Views: 2899

Red's Go Green

Hi Woody, thanks for your reply, btw. that 2006 Dateline is definately among the top educational/outreach videos about EVs ever made, personally it's my #1 because it covers so much ground in few minutes and with passion. I think there must be floating some higher res version of it on the internets ...
by Mesuge
Fri, 03 Apr 2009, 03:53
Forum: Members Machines
Topic: Weber and Coulomb's MX-5
Replies: 1698
Views: 334117

Weber and Coulomb's MX-5

This topic would be perhaps more appropriate in the dedicated technical thread, but are you still after the following spec. for your desired VFD (EValbum): "Control Techniques, Likely 75/90 kW SK5402" ? I've found some dealer's pricing on them, and it looks quite *attractive < £2,500 for a new drive...
by Mesuge
Thu, 02 Apr 2009, 23:51
Forum: General EV Discussion
Topic: Red's Go Green
Replies: 31
Views: 2899

Red's Go Green

SBS Dateline is fantastic production, don't forget their famous expose of Plasma boy's "White Zombie" and the EV scene of California&Pacific Northwest in the U.S. "Electric cars in California" /aired 14 Sep 06 http://www.youtube.com/watch?v=LXv6sO52xFY PS is anybody going to record the new "BYD" sho...
by Mesuge
Thu, 02 Apr 2009, 10:23
Forum: Batteries, charging, management and monitoring
Topic: Headway cylindrical LiFePO4 & DC-DC charging
Replies: 0
Views: 718

Headway cylindrical LiFePO4 & DC-DC charging

I'd like to draw your attention to the following interesting project. They are using "Headway" cylindrical LiFePO4 cells (serio-parallel setup), sourced from chinese brand which competes with prismatic TS. Another feature is Vicor MegaPAC PSU multi channel (8x48V) charger and DC-DC converter BMS cha...
by Mesuge
Thu, 02 Apr 2009, 04:35
Forum: The Lounge
Topic: Electricity Meter
Replies: 20
Views: 8903

Electricity Meter

Clipsal and similar products start north of $250.
I'm not sure but this project might be relevant, it scans the meter optically via ordinary webcam and feeds your PC, which decodes the data, more details forthcomming/needed:
http://www.electric-echo.com/blog/?p=56
by Mesuge
Thu, 02 Apr 2009, 04:03
Forum: General EV Discussion
Topic: Heater-- Demister
Replies: 91
Views: 16311

Heater-- Demister

Yet another water pump based heater-demister for <$40, 850-1500W @ 120VDC, probably the same co. sourced from Amazon

http://www.evprogress.org/Heater/Heeater.htm
http://www.evalbum.com/1601
by Mesuge
Wed, 01 Apr 2009, 12:10
Forum: Batteries, charging, management and monitoring
Topic: More Li batteries
Replies: 84
Views: 10214

More Li batteries

HiPower batteries have been used in several projects so far, there are perhaps some performance tests done at endlessphere, visforvoltage, diyelectriccar and other major sites. In automotive, the project to watch is perhaps this Audi A2/AzureD conversion, the guy just bought 100x 50Ah HiPower cells ...
by Mesuge
Wed, 01 Apr 2009, 06:27
Forum: EV Motoring
Topic: EVme $70K
Replies: 48
Views: 12625

EVme $70K

Interesting quote from the review article above: "Dr Coop and his small team of software experts, engineers and mechanics have spent between $2 million and $3 million developing the evMe for commercial use." Well, I think the pricetag is "justified" for the top drivetrain, charging and bms component...