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Kyphonii
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Post by Kyphonii » Mon, 11 Feb 2013, 23:35

Hi I'm new to the forum.
I have started a project in the hope that I will eventually have a very capable All Terrain Vehicle.
The vehicle will have a specific purpose and that dictates the path I will inevitably take.
I have a Subaru 1986 running gear as a starting point. 3.9:1 ratio diff with a 5 speed and high and low range.
The drive line has been shortened to a wheel base similar to a polaris.
and the width is also similar to a polaris.
To start the project I will fab a aluminium body that will evolve as required.
The power source is a disused golf buggy, A Yamaha 36 volt cart.
We don't intend to stay with the GE 2.2kw 36 volt system but it will start the project.
The vehicle will need to travel at no more than 20 kph and to have as much range as possible.
When required the vehicle will need the power to scale very difficult terrain at slow speed.
I have a quite capable 19 year old nephew that is in to all thing electric. I have little knowledge but will learn.
I would welcome any information that may lessen the pain and hardship that could follow this endeavour.
Cheers.


Canberra32
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Post by Canberra32 » Tue, 12 Feb 2013, 01:11

As a build it from scratch man I say enjoy the pain :)
Just remember that pointless turning wheel in the middle of nowhere turned a boy into Conan.

Best advice I got is google till your fingers hurt then know exactly what questions to ask

Kyphonii
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Post by Kyphonii » Tue, 12 Feb 2013, 01:22

Question.
If you could have the ideal set up what would that be?
Motor size and type. The Electric Polaris utilizes a 48 volt 30 hp Ac motor.
Controller?
Power supply type and size?
I have a total weight of 800kg that includes 200kg battery and 200 kg occupants.

Edit the polaris is a 30hp AC 48 volt.
Last edited by Kyphonii on Mon, 11 Feb 2013, 14:27, edited 1 time in total.

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jonescg
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Post by jonescg » Tue, 12 Feb 2013, 01:27

With those sorts of weights you might as well use everything that goes into a typical conversion. A 200 kg battery is at least 25 kWh, maybe 30 kWh. Just 'ruggedise' everything, especially the battery so it doesn't get shaken to pieces. Depending on the money you want to spend of course, you could get a respectable 40 kW AC motor in there. One like this seems logical for small vehicles?
http://ev-power.com.au/-95-EV-Motors-AC-Induction-.html
AEVA National Secretary, WA branch vice-chair

unheardofinstruments
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Post by unheardofinstruments » Tue, 12 Feb 2013, 02:35

A friend did just that but welded a hydraulic motor from a forklift to the input shaft of the gearbox and had an electric hydraulic pump running from 4 batteries with a bleed valve running from the accelerator pedal. He now has replaced the electrics with a diesel stationary motor. It has incredible torque and traction, he tows his tractor out of bogs with it and does very steep terrain like nothing else. It now has hydraulic lifters and an old saw blade from a mill as a front slasher all running off another tiny light hydraulic motor. It is very basic and runs on large quad bike wheels and cut down drive shafts. Very mad max.

Canberra32
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Post by Canberra32 » Tue, 12 Feb 2013, 02:40

Look I don't see why it needs to be that weight.
I got a 268kg batt and a 100kg motor and the whole full size car tops out at 750kg
If you come in at more than 500kg you have done something wrong.
Stick with say a 10kw and gear it as you say no more than 20kph
Ditch the suberu parts and get atv parts.
Only reason you would need the suberu parts and big power is if you want a top speed of 120kph+
Basically your building an off road golf buggy.

I'm just saying dont bring a tank to a bicycle race

Kyphonii
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Post by Kyphonii » Tue, 12 Feb 2013, 03:06

Canberra32 wrote: Look I don't see why it needs to be that weight.
I got a 268kg batt and a 100kg motor and the whole full size car tops out at 750kg
If you come in at more than 500kg you have done something wrong.
Stick with say a 10kw and gear it as you say no more than 20kph
Ditch the suberu parts and get atv parts.
Only reason you would need the suberu parts and big power is if you want a top speed of 120kph+
Basically your building an off road golf buggy.

I'm just saying dont bring a tank to a bicycle race


The end result will probable be Atv components but to start we used what was laying around.
I have been looking for ATV but no one wants to give them away.
The Aluminium body will just be adapted to what is required, I work in aluminium as it easy for me.
We will also try to make the body float but we will see how that works out.
front ends and rear end are optional.
The weight of a similar electric polaris is 780 kg dry and they have less than 12 kWh of battery.
It will end up light but like the motor/system it will evolve over time.

Canberra32
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Post by Canberra32 » Tue, 12 Feb 2013, 03:23

A car with 22" rims and 1.7x2.6 tire print on the road a 5speed and a 27kwh battery is coming in at 750kg...
What the hell is wrong with a Polaris that they make it weigh so much and have so little power...
Led acid?

Check out motorbike parts trader :) you will find all sorts of goodies there.
Or get a cheap Chinese quad and molest it for parts and build your own frame.
Looked at one for the kids and it was 1200 :)

Hunt hunt hunt

Kyphonii
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Post by Kyphonii » Fri, 22 Feb 2013, 20:54

The motor we have is 36 volt DC GE from a Yamaha Golf buggy.
2.2 kw for 30min at 40'c. 77amp.
wound series. insulation class F.
Is this motor capable of more performance by increasing volts and changing to a better controller.
cheers


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Kyphonii
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Post by Kyphonii » Fri, 22 Feb 2013, 21:01

motor to gearbox adaptor. Trial run.



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antiscab
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Post by antiscab » Sat, 23 Feb 2013, 13:54

Kyphonii wrote: 2.2 kw for 30min at 40'c. 77amp.
wound series. insulation class F.
Is this motor capable of more performance by increasing volts and changing to a better controller.


the commutator will limit how high a voltage you can go

the motor seems to be rated to 70A for 30 mins, I would suspect a similar rating at higher voltage

I wonder what rpm it develops 2.2kw @ 36v?

the upper rpm limit is usually 4-5000rpm, it actually gets lower as the motor temp goes up

Matt
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2007 vectrix - 156'000km
1998 prius - needs Batt
1999 Prius - needs batt
2000 prius - has 200 x headway 38120 cells

Kyphonii
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Post by Kyphonii » Sat, 23 Feb 2013, 14:38

The motor plate has 2450rpm with a max safe rpm of 8000.

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