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Advice about high torque motors ? Answered

So recently I've been wanting to to build some kind of electric mini car/gocart but I have no idea about battery and motor requirements.
Basically what I want to know is what would be some battery and motor requirements for such a vehicle, I need to know how many volts, amps, rpm, amp hours, kg per sq cm, motor type etc. I know I'm asking a lot , probably way too much but I'd be really greatful if I could obtain even some of this information.:-)

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iceng

Best Answer 2 years ago

You get Torque as the product of Force XDistance.. So a large diameter brushless motor will be able to develop a lot of torque with many MMF Pole pairs that will allow a lower speed then conventional motors that need a speed reducing gearbox like a staged planetary gear set.

How heavy are you and your gocart ?

How far and how fast do you want to travel ?

How heavy are the weapons you will carry with you ?

TQmotor.pngwheel-hub-motor-retrofit-kit.jpghub-motor-internals.png
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rickharrisiceng

Answer 2 years ago

Darn - I didn't think of that last one!

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rickharris

2 years ago

https://www.instructables.com/id/Building-an-electr...

there are other electric vehicle instructabes so try a search.

Much depends on how fast you want to go, How quickly you want to accelerate. How far you want to go. How much weight you need to carry.

This isn't a trivial project and will take some time and money.

You need to work out how to steer the car, how to stop the car as well as how to make it go.

Come back when you have read my instructable above AND looked at the greenpower site linked in that instructable at least twice.

Many of your questions will have been answered, you will still have others but they will be better formed.

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DIYWEAPONSrickharris

Answer 2 years ago

unluckily ebay will not be an option for me, I'll have to just buy from a.local store, if I used bike gearing it would have to b a very good chain to cope with the torque, although there shouldn't be as much strain with gears. I assume you used deep cycle car battery?

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DIYWEAPONSDIYWEAPONS

Answer 2 years ago

I was thinking about making a 3 wheeler, the front being the front of a bike and the back, well I'll just have to improvise, would you recommend having single or double wheel drive?

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rickharrisDIYWEAPONS

Answer 2 years ago

3 wheels is done.

https://www.google.co.uk/search?q=velomobiles&biw=...

Will be heavier so your going to need a motor that will give you 500 watts.

Depending on where you are in the world a washing machine may provide a suitable DC motor, maybe even 12 volts

KEY build very light.

Stopping is as important as moving.

Maybe you can get some thing out of a powerful radio control motor they advertise power rating in the 100's of watts. it will be at 30,000 RPM though so you will more then likely need to drive onto the tire.

http://thestuffwebuild.com/2014/06/the-story-of-ho...

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rickharrisrickharris

Answer 2 years ago

Single wheel drive is easyiest and no different to double except for traction which won't bother you.

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DIYWEAPONS

2 years ago

right, thanks for the info, I'm 175lb, I have no idea how heavy the cart will be since I having started building it yet, I'm hoping not more than 200lb. I would like the top speed on flat to be at least 18mph, distance not a big deal , 10miles or more. Weapons will not be necessary, I was thinking about using bicycle style gearing, would this work?

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rickharrisDIYWEAPONS

Answer 2 years ago

No need to gear up - 250 watts at 12 volts is plenty for your specification. Build it VERY light. Minimum aluminium, ideally carbon fiber. See my instructable linked below.

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DIYWEAPONSrickharris

Answer 2 years ago

You think I'll be able to get good speed and good torque without gears? Ok then, how much should I spend on a decent motor, and what about batteries. As for carbon fibre there is no way I can afford or even get ahold of that stuff, more likely it will be steel and pvc,

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rickharrisDIYWEAPONS

Answer 2 years ago

I think you will be able reach your stated aims if you build a very light cart.

The motor I used cast £150 but the chances are we don't live near each other. Try Ebay, Google.

The batteries were 2 standard car batteries.

Did you read all of my Instructable and the links in there?

https://www.google.co.uk/#q=electric+go+kart+:+sit...

is all of the instructables here covering electric go karts.

or go carts

https://www.google.co.uk/#q=electric+go+cart:+site...

I didn't use gears, an electric motor has very good low speed torque HOWEVER you need to have the right gearing for your wheel size otherwise you may find it won't start off from stationary without a push.

Many contestants in the races used bike gears it's up to you. We didn't.

Read the instructable thoroughly .