Search found 100 matches

by gmacd33
Thu, 24 Mar 2011, 19:52
Forum: Technical and conversion discussion
Topic: VW Type 1 conversion... maybe
Replies: 30
Views: 5004

VW Type 1 conversion... maybe

LSD and stronger gearbox will be great for the high torque of a DC motor. In the range we are talking about, the gain in having a gearbox is an order of magnitude greater than the amount of time to shift gears (although you probably wouldn't need 1st, and maybe 2nd gear - traction issues). Also the ...
by gmacd33
Thu, 24 Mar 2011, 13:16
Forum: Technical and conversion discussion
Topic: VW Type 1 conversion... maybe
Replies: 30
Views: 5004

VW Type 1 conversion... maybe

Hi Richard, welcome to the forum! EVs are great for acceleration, because of the torque curve of an electric motor. You can certainly get 6 seconds and better! (I'm designing one for about 3 seconds.) An elec motor of a certain peak kW rating will give acceleration times of a petrol engine of a much...
by gmacd33
Tue, 22 Mar 2011, 19:06
Forum: The Lounge
Topic: I want to go home!
Replies: 21
Views: 2114

I want to go home!

Regarding A123 availability - I've tried a few times to get hold of them for specs and pricing of cells, but they haven't returned my messages. The message on their website reads: "Please be aware that A123 is focused on high volume commercial applications and does not supply battery cells or system...
by gmacd33
Thu, 17 Mar 2011, 22:49
Forum: Technical and conversion discussion
Topic: Vehicle weights post EV conversion
Replies: 12
Views: 2091

Vehicle weights post EV conversion

To get good range from minimum weight you could look at an AC motor - even on the highway without regen it's more efficient, thus more range. AC motors also tend to be lighter than DC motors of the same power. There are also much lighter batteries available, with just as much capacity, power etc - i...
by gmacd33
Wed, 16 Mar 2011, 21:50
Forum: The Lounge
Topic: Howto convince your partner to let U build an EV
Replies: 33
Views: 3935

Howto convince your partner to let U build an EV

You could just say that it's something you really want to do, because you will enjoy the challenge etc of doing it. I like Richo's suggestion of getting her advice, making her feel like she is involved, so she doesn't feel like "it's taking you away from her" BTW if AC stands for Alternating Current...
by gmacd33
Tue, 15 Mar 2011, 17:04
Forum: AEVA QLD Branch
Topic: March Meeting
Replies: 2
Views: 1216

March Meeting

Hey folks, quick reminder about the AEVA meeting tomorrow night.

We're expecting a big turnout, so be sure to get there early for good seats!

Greg
by gmacd33
Tue, 15 Mar 2011, 16:30
Forum: Electric motors and controllers
Topic: In wheel Motor by Protean
Replies: 17
Views: 6355

In wheel Motor by Protean

I would agree with those limitations of wheel motors. Another issue is that you can't use a multi-stage gearbox, so you have only one gear ratio - this limits acceleration, or top speed, or both. I think the only benefit is possibly increased efficiency, without the losses of the gearbox and/or diff...
by gmacd33
Mon, 14 Mar 2011, 14:59
Forum: EV Racing
Topic: 200mph what to use AC or DC??
Replies: 109
Views: 15001

200mph what to use AC or DC??

That thinking is correct for ICE vehicles, but with a DC motor the max torque is at slow speeds from standing - at any gearing.

I realise now that it was "The Spog" who is using the separate motor for acceleration - my bad.
http://www.ibys.org/shed/?p=394
by gmacd33
Sat, 12 Mar 2011, 15:01
Forum: EV Racing
Topic: 200mph what to use AC or DC??
Replies: 109
Views: 15001

200mph what to use AC or DC??

Hey Spog folks!

Why are you using a separate motor to accelerate from standing? Those DC motors have max torque from 0rpm, so would be best to accelerate I would have thought?!?

by gmacd33
Fri, 04 Mar 2011, 22:01
Forum: AEVA QLD Branch
Topic: March Meeting
Replies: 2
Views: 1216

March Meeting

Image
by gmacd33
Fri, 18 Feb 2011, 22:47
Forum: General EV Discussion
Topic: Blade EV - New model
Replies: 104
Views: 13233

Blade EV - New model

So if it's not referring to the motor or controller, then it must be the transmission, differential, drive shaft etc? My understanding is that those parts come from a Hyundai Getz, which is not made in Australia?!? Not to mention the fact that many people use the term DRIVE TRAIN to mean the same as...
by gmacd33
Tue, 15 Feb 2011, 18:02
Forum: AEVA QLD Branch
Topic: February 2011 Meeting
Replies: 0
Views: 923

February 2011 Meeting

Hi all Meeting this Wednesday for Feb, same time same place: Albion Peace Hall 102 McDonald Rd, Albion 7:30pm Don is home sick with Hooping Cough, and will stay away to avoid spreading germs. As such I've agreed to hold the meeting. The plan is to - continue discussions re the EV festival, - look at...
by gmacd33
Tue, 08 Feb 2011, 21:41
Forum: General EV Discussion
Topic: Pre or post 1995 model donors
Replies: 8
Views: 1178

Pre or post 1995 model donors

My understanding is that a home-converted vehicle is an Individually Constructed Vehicle (ICV). These are exempt from the requirements for ABS, Stability Control, crash testing for airbags etc. Air-con is tricky either way - you need to find a motor and controller to provide 1-2kW. This is difficult...
by gmacd33
Mon, 07 Feb 2011, 19:39
Forum: General EV Discussion
Topic: DC Regen from practical and personal experience.
Replies: 37
Views: 6491

DC Regen from practical and personal experience.

I looked into this myself when designing the first prototype, ie using DC/DC converters to get regen from a DC motor. However the cost of converters is pretty high, and I found that you get more for your money if just spent on extra batteries. If building the DC/DC converter yourself it may be diffe...
by gmacd33
Mon, 13 Dec 2010, 16:15
Forum: General EV Discussion
Topic: Regen breaking on series wound dc motor
Replies: 17
Views: 3224

Regen breaking on series wound dc motor

That's an interesting point about interpoles; I have heard before the voltage limitation before advanced timing is required, which prohibits regen. Anyone know of any disadvantages of using interpoles - ie why don't Netgain and ADC use them?!?
by gmacd33
Wed, 20 Oct 2010, 17:53
Forum: General EV Discussion
Topic: List of conversion workshops in Australia
Replies: 52
Views: 23930

List of conversion workshops in Australia

WRT to QLD Conversion Workshops, there are 2 more: I'm setting up a business to do conversions in Brisbane: EVolve Motors Runcorn Greg MacDonald gmacd33@gmail.com 0438984089 I'll be doing medium to high-end DC conversions, with highway speeds, air-con, power steering, 100km range etc. Fairly customi...
by gmacd33
Fri, 08 Oct 2010, 17:01
Forum: General EV Discussion
Topic: Contactors - GIGAVAC
Replies: 12
Views: 2130

Contactors - GIGAVAC

Geoff, another problem may be the rating of the contactor - is it rated for the voltage you are switching, and specifically is it made for DC? AC contactors rely on the zero crossing of the current in the sine wave cycle, which does not require as much spring force to break the contacts.
by gmacd33
Fri, 08 Oct 2010, 16:59
Forum: General EV Discussion
Topic: Contactors - GIGAVAC
Replies: 12
Views: 2130

Contactors - GIGAVAC

WRT the contactor not turning off, my colleagues have had similar problems with installations in industrial sites - usually the leakage current of the transistor switching the contactor is too high, so that once the contactor is on it can't switch off. What are you using to switch the contactor coil?
by gmacd33
Tue, 24 Aug 2010, 20:22
Forum: General EV Discussion
Topic: How many EVs on the roads?
Replies: 6
Views: 1091

How many EVs on the roads?

Apparently there are 8 registered in Brisbane - not sure about the rest of the state though... would be interesting to know
by gmacd33
Fri, 20 Aug 2010, 23:15
Forum: General EV Discussion
Topic: New Member :)
Replies: 22
Views: 2069

New Member :)

I have to agree that $10k budget for a conversion is mighty optimistic, even if you accept a very slow vehicle with a very low range - and if you do all the welding, milling and fabrication work yourself, as well as the mechanical engineering design etc.
by gmacd33
Fri, 29 Jan 2010, 08:43
Forum: Batteries, charging, management and monitoring
Topic: Battery required for 12V system?
Replies: 4
Views: 639

Battery required for 12V system?

I've been reading about using a separate battery for the 12V system on the car (for lights, accessories etc), which is charged by a DC-DC converter powered from the main battery pack. The question is: why is a 12V battery required? Surely the 12V circuit can be powered directly from the DC-DC conver...
by gmacd33
Fri, 29 Jan 2010, 07:51
Forum: Electric motors and controllers
Topic: Chinese EV Kit
Replies: 8
Views: 2447

Chinese EV Kit

What is the max torque and power on this kit?
by gmacd33
Thu, 28 Jan 2010, 16:21
Forum: Electric motors and controllers
Topic: Kostov Motors
Replies: 1
Views: 962

Kostov Motors

Anyone had experience with the Kostov motors, esp the 17R? Are they any good? Wondering how they compare to Netgain and ADC?
Thanks, Greg
by gmacd33
Thu, 28 Jan 2010, 03:49
Forum: AEVA QLD Branch
Topic: Certification Engineers Brisbane
Replies: 3
Views: 1622

Certification Engineers Brisbane

Hi all, wondering if people can recommend a good certification engineer in Central/North Brisbane, or at least where to go to find reasonable ones? I'm about to start the conversion work, and have been advised to talk to the certification guys early. Also how much are they likely to cost?!? cheers G...
by gmacd33
Thu, 28 Jan 2010, 03:46
Forum: AEVA QLD Branch
Topic: Electric Motors
Replies: 6
Views: 2996

Electric Motors

I see Kostov motors have recently appeared on the EV Works website - anyone have any experience of them? I see they are a fair bit cheaper than the Netgain ones of similar size?!?