Search found 121 matches

by T2
Sat, 12 Jun 2010, 14:41
Forum: Electric motors and controllers
Topic: big batteries and step up DC converters
Replies: 69
Views: 19559

big batteries and step up DC converters

I think it's always good to bring up all options regardless. As options go this one is probably worth pursuing. Sure the Upconverter adds further complexity but it reduces battery pack complexity big time. The reduction in the number of battery interconnects, contactor safety disconnects and BMS mo...
by T2
Fri, 11 Jun 2010, 05:06
Forum: General EV Discussion
Topic: 2 Speed Gearbox
Replies: 309
Views: 57390

2 Speed Gearbox

-EV2GO The purpose of a gearbox is to accelerate the mass quicker. When the change takes more time then the benefit of the gear change it results in a negative benefit (i.e better off leaving it in the same gear). History repeats itself. Eaton Corporation's white paper published in EVS '83 described...
by T2
Sat, 05 Jun 2010, 11:14
Forum: General EV Discussion
Topic: Government EV Policy
Replies: 35
Views: 5610

Government EV Policy

What's your point? I guess I was being facetious in the face of despair that our govt is not doing enough. There have been demo models driving around the nation's capital for what seems like forever. The public gets an invite downtown to one of these dog and pony shows. You get to take a trip in th...
by T2
Fri, 04 Jun 2010, 09:44
Forum: General EV Discussion
Topic: Government EV Policy
Replies: 35
Views: 5610

Government EV Policy

-marcopolo            let me give yet another view of Darryl McMahon and EVAC. Although I've known Darryl since 1981, I have not had opportunity to converse with him lately, and casual attempts to contact him via email on the econogics.com website have not been successful either. So let me say that ...
by T2
Thu, 03 Jun 2010, 23:33
Forum: Electric motors and controllers
Topic: big batteries and step up DC converters
Replies: 69
Views: 19559

big batteries and step up DC converters

Sheesh I almost wish I hadn't brought it up ! The inductor was sourced from a 400 Amp Willey DC controller. Of laminated costruction with its volume approximating a 4" cube the output inductor was rated for only 4khz operation. I have previously experimented with it and a single device (MJ11031) at ...
by T2
Tue, 01 Jun 2010, 15:46
Forum: Technical and conversion discussion
Topic: Solutions Knowledge Base
Replies: 20
Views: 3131

Solutions Knowledge Base

It is simple in theory but trying to actually convert 50-100kW at 100V to 200V+ is both expensive and complicated to get working Should be easier than buck regulator. Since inductor could be "empty" when you come back on. I'll post later on DC upconverter thread in the coming weeks. Yep I think we ...
by T2
Tue, 01 Jun 2010, 10:37
Forum: Electric motors and controllers
Topic: big batteries and step up DC converters
Replies: 69
Views: 19559

big batteries and step up DC converters

-HeadsUp In the process of building, I've been looking at an Upconverter in the event that my system input voltage may need some boosting as well. I have been getting a Plan B going for this eventuality as adding batteries is not an option in my case. Er, 64v --> 500 vDC. Like everything else modera...
by T2
Sat, 29 May 2010, 11:52
Forum: Technical and conversion discussion
Topic: Solutions Knowledge Base
Replies: 20
Views: 3131

Solutions Knowledge Base

johny you wrote -        If my car cannot do Tollway/Freeway speeds then it's not really viable Then what you are doing is really high end, IMO. Please accept the fact that few people have both the mechanicaI and electrical knowledge to reach that level. It's great that you're able to do it today a...
by T2
Fri, 28 May 2010, 11:33
Forum: Technical and conversion discussion
Topic: Solutions Knowledge Base
Replies: 20
Views: 3131

Solutions Knowledge Base

I've been searching for gaps in my knowledge also and it is hard to get people to stay on a topic, with things being so related. We do need a moderated 'sticky' heading for each technical forum that can be referred back to. There is room for improvement in our delivery of basic concepts. Sometimes I...
by T2
Thu, 20 May 2010, 16:31
Forum: Members Machines
Topic: Red Suzi
Replies: 217
Views: 59113

Red Suzi

I make it 361 VAC under load. OK johny, I took 576-72Vdc           Then divided by root 2 ....   To give rms value between legs that are 180 deg apart           Then multiplied by (root 3)/2 i.e. 0.866 ....   To correct for 120 deg between legs              I get 306Vac but then since the output wa...
by T2
Tue, 18 May 2010, 09:57
Forum: Members Machines
Topic: Red Suzi
Replies: 217
Views: 59113

Red Suzi

-acmotor IMO your machine isn't quite getting the performance of which it might be capable. You seem to have done a lot of the right things so I did an evaluation of the Impact's system in greater depth than I had bothered before, to see what I could learn. Their Pb-acid Battery system is one third ...
by T2
Mon, 17 May 2010, 19:59
Forum: Technical and conversion discussion
Topic: Multiple Motors vs Transmissions
Replies: 21
Views: 4171

Multiple Motors vs Transmissions

-woody,johnny, yeah, you turned me. I figured that a sharp 180 degree would only be undertaken at low speed. The low frequency and low excitation voltage could be less effective and the likelihoood of large circulating currents between stators quite small. The induction generator itself could be pus...
by T2
Mon, 17 May 2010, 13:00
Forum: Technical and conversion discussion
Topic: Multiple Motors vs Transmissions
Replies: 21
Views: 4171

Multiple Motors vs Transmissions

I see no reason to abandon the single controller with two motors model. It would be necessary for each of the two motors to have its own encoder. A possible strategy would be for the controller to provide an output which would be preferential to the slower motor. When an opposing differential in spe...
by T2
Sun, 16 May 2010, 16:29
Forum: Technical and conversion discussion
Topic: Multiple Motors vs Transmissions
Replies: 21
Views: 4171

Multiple Motors vs Transmissions

Look fellas,             could we follow this thread only to vehicles that meet current posted speed limits +15mph. So as not to stretch motor RPMs ? Particularly as most are not going to be driving even at 80mph.        The Impact (EV1) was limited to 75mph. Although it was geared 10.5:1 The Prius ...
by T2
Sun, 16 May 2010, 14:47
Forum: Technical and conversion discussion
Topic: How to convert a hybrid
Replies: 132
Views: 26766

How to convert a hybrid

coulomb - As a point of interest, and in brief, what were the issues with the old equipment? When you join a supposedly prestigious organisation like the BBC you expect to be working with SOTA equipment and not feel like the curator of a radio museum ! The two RCA TXs were backup for the six 250Kw M...
by T2
Sat, 15 May 2010, 12:57
Forum: Technical and conversion discussion
Topic: How to convert a hybrid
Replies: 132
Views: 26766

How to convert a hybrid

-coulomb Are you saying that these failures are common ? No, I am not. The several vehicles that I read about that were picked up 'as is' turned out not to be fixable. You probably know also that Toyota has been allowing 'secret' warranties in NA to avoid bad press. With serviceable transaxles appea...
by T2
Fri, 14 May 2010, 12:28
Forum: Technical and conversion discussion
Topic: How to convert a hybrid
Replies: 132
Views: 26766

How to convert a hybrid

Could it be you missed that we are talking (among other things) about a NHW10 Prius? Sure did ! My mistake. I was looking back and saw you got it powered up the next day. And reason left me ! Neither the inverter nor ECU was fried, and no shorted windings in MG1,MG2 ? In North America these usually ...
by T2
Thu, 13 May 2010, 17:10
Forum: Members Machines
Topic: Red Suzi
Replies: 217
Views: 59113

Red Suzi

ACMOTOR - Great work well done!! But I have some queries if you have the time. Too bad I am late to the party. But it so happens I have lying around a DANFOSS product catalog which devotes 69 pages to the VLT 5000 series, I therefore became more interested in how you might or might not be abusing th...
by T2
Sun, 09 May 2010, 22:40
Forum: EV Motoring
Topic: ABC Lateline
Replies: 30
Views: 5450

ABC Lateline

I, for one, don't see Toyota getting it wrong with the Prius either. They were putting out untried technology as far as the automotive sector is concerned. They were setting themselves up for enough risk with liquid cooled high power inverters. You think they should have put themselves on the line f...
by T2
Sat, 08 May 2010, 08:52
Forum: Technical and conversion discussion
Topic: Multiple Motors vs Transmissions
Replies: 21
Views: 4171

Multiple Motors vs Transmissions

Of course the Impact was the first pure electric concept vehicle to adopt twin motors. The Impact was built around 1989 by Allan Cocconi et al. at Aerovironment under contract to General Motors USA. A short video "Imagine the Impact" was released. It is probably on YouTube. It shows a competition ru...
by T2
Sat, 08 May 2010, 07:54
Forum: Technical and conversion discussion
Topic: How to convert a hybrid
Replies: 132
Views: 26766

How to convert a hybrid

Congrats Mr Mik,                  You lucky bleeder !! Hoping that is the correct Australian parlance. I've just registered with AEVA but not to discuss the Prius specifically. I would like to add some Canadian perspective. Over here on this continent we now have a population of around million Prius...