Search found 61 matches

by Crash
Thu, 11 Jul 2013, 15:26
Forum: Members Machines
Topic: ELMOFO Electric Radical SR8
Replies: 44
Views: 6748

ELMOFO Electric Radical SR8

was quoting Stiive, 13th June earlier in this thread. I didn't think Hunter EV festival had any races for fully fledged race cars and is unusual to call a 20min race an enduro, hence interested to find out what he was referring to.
by Crash
Wed, 10 Jul 2013, 06:29
Forum: Members Machines
Topic: ELMOFO Electric Radical SR8
Replies: 44
Views: 6748

ELMOFO Electric Radical SR8

<The endurance race is about 20mins - last year it was a 40deg day>

What was the 20min endurance race called and where held?

Thanks
Wayne
by Crash
Wed, 10 Jul 2013, 06:13
Forum: Scooters, mopeds and electric toys
Topic: Segway clone project motor choice help
Replies: 10
Views: 3847

Segway clone project motor choice help

I wouldn't be suprised if some of the motor controllers that are available have features in them that create problems with torque reverse to motor direction, also they can have a bit of cogging at slow speeds which may interfere with the segway balancing algorithms but would be interested to see how...
by Crash
Wed, 10 Jul 2013, 05:58
Forum: Scooters, mopeds and electric toys
Topic: The world's lightest electric vehicle?
Replies: 8
Views: 2849

The world's lightest electric vehicle?

There is a great instructable on how to make a mini in wheel bldc motor for a razer typr scooter here http://www.instructables.com/id/Make-Your-Own-Miniature-Electric-Hub-Motor/ . It would be good to see someone producing these commercially in large quantities. Would have potential to simplify one s...
by Crash
Wed, 03 Jul 2013, 04:57
Forum: EV Racing
Topic: Electric Karts
Replies: 19
Views: 2675

Electric Karts

Is Formula E karts in NZ a hire kart track or a club track for privately owned racing karts?
by Crash
Wed, 03 Jul 2013, 04:56
Forum: EV Racing
Topic: Electric Karts
Replies: 19
Views: 2675

Electric Karts

OK point taken, suspension may not the best idea but its also not the main point of the thread. What batteries, how many, where to mount them, what motors, one or two and how do we get a few electric karts built and start racing. If there are ideas such as suspension that are contentious, what bette...
by Crash
Tue, 02 Jul 2013, 07:05
Forum: EV Racing
Topic: Electric Karts
Replies: 19
Views: 2675

Electric Karts

A 125cc kart is reported on karting sites at about 90kg including chassis and motor. Mtb coil over spring shock units are around 500g (total 2 kg) each 8x aluminium arms which can be easily cut from ali plate as size is small adds about another 1.5kg, bolts and joints allow about 500kg Total of abou...
by Crash
Mon, 01 Jul 2013, 16:15
Forum: EV Racing
Topic: Electric Karts
Replies: 19
Views: 2675

Electric Karts

People said that about mountain bikes when they started to emerge.

I wouldn't expect a suspension system for a kart to be anywhere near as heavy as motor or batteries.
by Crash
Mon, 01 Jul 2013, 06:08
Forum: EV Racing
Topic: Electric Karts
Replies: 19
Views: 2675

Electric Karts

I can't help thinking that it is about time we started to see electric kart racing starting to appear in Australia. with the eFXC motorbike racing demonstrating feasibility of an electric racing formula and an international open wheeler formula not far away. The question I have is should electric ka...
by Crash
Mon, 01 Jul 2013, 05:43
Forum: Electric motors and controllers
Topic: Torque Vectoring or Traction Control - Twin motors
Replies: 32
Views: 4137

Torque Vectoring or Traction Control - Twin motors

Sensors are simple, only need to monitor wheel speed of the wheels. Logic for controlling power input is based on a) comparing the speed of each wheel and b) if wheel acceleration exceeds a preset maximum which is the maximum possible acceleration for the vehicle in ideal conditions. a) would probab...
by Crash
Fri, 28 Jun 2013, 03:13
Forum: Electric motors and controllers
Topic: Torque Vectoring or Traction Control - Twin motors
Replies: 32
Views: 4137

Torque Vectoring or Traction Control - Twin motors

There was a guy from New Zealand that figured it out, at least for one electric motor in an electric powered Arial Atom. I agree it could be pretty complex if you want a full vehicle stability control system. To manage control of a vehicle in slides with yaw, suspension control, tyre pressure, accel...
by Crash
Thu, 27 Jun 2013, 16:02
Forum: Electric motors and controllers
Topic: Torque Vectoring or Traction Control - Twin motors
Replies: 32
Views: 4137

Torque Vectoring or Traction Control - Twin motors

So it seems fairly established that the big car makers use CAN bus with other secondary and independent bus systems to control the numerous systems in a modern car and Tritium has developed a sophisticated system along these same lines. However if you were looking to develop a very simple system pur...
by Crash
Wed, 19 Jun 2013, 07:17
Forum: Electric motors and controllers
Topic: Torque Vectoring or Traction Control - Twin motors
Replies: 32
Views: 4137

Torque Vectoring or Traction Control - Twin motors

I'm impressed there is this sort of knowledge out there offered so freely. In a few years time when auto companies need this expertise and you are working for them, you might not be allowed to offer free advice. Do the current products have the ability to control dual motors based on inputs from var...
by Crash
Wed, 19 Jun 2013, 05:39
Forum: Electric motors and controllers
Topic: Torque Vectoring or Traction Control - Twin motors
Replies: 32
Views: 4137

Torque Vectoring or Traction Control - Twin motors

Fun doesn't need wheel spin. Going far too fast into a corner and letting the traction control do its magic while watching your passenger reach for the grab rail is a recent pleasure but I'm sure is just a taste for what is possible with the precision of electric control. Watch https://www.youtube.c...
by Crash
Wed, 19 Jun 2013, 03:26
Forum: Electric motors and controllers
Topic: Torque Vectoring or Traction Control - Twin motors
Replies: 32
Views: 4137

Torque Vectoring or Traction Control - Twin motors

Thanks for all the great discussion. I'm comfortable that the natural characteristics of motors will allow sufficient variation in rotation speed for cornering as per Tritium James comments. The application in question is a rwd car with belt drive to each wheel to eliminate the diff and gearbox. The...
by Crash
Tue, 18 Jun 2013, 06:50
Forum: Electric motors and controllers
Topic: Torque Vectoring or Traction Control - Twin motors
Replies: 32
Views: 4137

Torque Vectoring or Traction Control - Twin motors

Hi, Does anyone have any experience with electronic torque control between two (or more) motors in the one vehicle? Has anybody tried or know someone that has played around with a picaxe or arduino board to take a single throttle pot input and output to two controller throttle inputs with the abilit...
by Crash
Mon, 03 Dec 2012, 15:23
Forum: EV Racing
Topic: 2012 eV Challenge Perth Teams
Replies: 8
Views: 1736

2012 eV Challenge Perth Teams

Average speed of cars is about 40km/h. Fastest lap times of the 1 22 on a 960m track. The battery packs are limited by the rules to 432 Wh. If you allowed them to be bigger we would still run them to the limit. Get a good battery management system and you can run them to the limit safely. The idea o...
by Crash
Wed, 24 Oct 2012, 04:42
Forum: Members Machines
Topic: Stuart's Work in progress
Replies: 58
Views: 9634

Stuart's Work in progress

Thats a pity, was looking forward to the east coast challenge. Even looked at taking our cars across for the Hunter EV Challenge, but unfortunately the rules were not even remotely close and their rules are completely unsuited to cars with 3 or 4 wheels.

by Crash
Fri, 19 Oct 2012, 15:42
Forum: Members Machines
Topic: Stuart's Work in progress
Replies: 58
Views: 9634

Stuart's Work in progress

Hi Stuart,
Haven't heard from you for a while, how is the build going? Are you on track to be here for an East coast challenge on the West Coast's EV race? I think we could use it to help get some press coverage if you are?

Wayne
by Crash
Fri, 19 Oct 2012, 15:36
Forum: EV Racing
Topic: 2012 eV Challenge Perth Teams
Replies: 8
Views: 1736

2012 eV Challenge Perth Teams

How are your 2012 cars going? The race is on next weekend at the RAC Driver training centre. This is one of a handful of races for battery electric cars and it seems to be the only electrathon style event in Australia. There is a wide array of locally built cars from schools, tafe, colleges and priv...
by Crash
Tue, 29 May 2012, 16:47
Forum: EV Racing
Topic: FIA Formula E Championship
Replies: 73
Views: 13127

FIA Formula E Championship

FIA to Establish Electric version of F1 The FIA are moving on establishing what they see as being the top international electric racing formula. An expression of interest closed earlier in the year for manufacturers to put forward proposal to construct up to 24 electric racing cars for the champions...
by Crash
Tue, 29 May 2012, 16:28
Forum: EV Racing
Topic: Grass roots electric racing class
Replies: 10
Views: 1054

Grass roots electric racing class

Personally I'd be keen to go to the next level having built several electrathon cars and build an open wheeler / SAE style car. I don't think this has to be the high cost exercise that people may assume if there are reasonable limits on the power and capacity of motor/controller and battery and stru...
by Crash
Fri, 13 Apr 2012, 05:19
Forum: EV Racing
Topic: Australian Grass Root EV Racing
Replies: 47
Views: 6262

Australian Grass Root EV Racing

Well it looks like we would be up to at least 4 or 5 entrants for a higher speed electrathon style event that does not try and restrict it to efficiency trials and provides some racing. That said, last years WA electrathon had some great 'racing' even though it was officially racing with the event d...
by Crash
Wed, 28 Mar 2012, 07:12
Forum: EV Racing
Topic: Australian Grass Root EV Racing
Replies: 47
Views: 6262

Australian Grass Root EV Racing

US Electrathons are running about 70lbs (30kg) of lead batteries and top competitors are doing just over 60 miles (96km) in a 1 hour event. Looks like they often use oval tracks and don't have driver changes which would mean pit stops and corners would not be affecting average speeds like the EV Cha...
by Crash
Thu, 22 Mar 2012, 17:13
Forum: EV Racing
Topic: Australian Grass Root EV Racing
Replies: 47
Views: 6262

Australian Grass Root EV Racing

Yes, Am part of the River Raiders team that has competed in the EV Challenge for the last few years. Part of the motivation for having this discussion was that the EV Challenge organisers see there event more as an efficiency trial and do not seem to want to grow the event to include "racing" or hig...