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Old 05-09-2011, 04:40 PM   #1
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Default Motor, Controller.....??

Ok, as a former motorcycle drag racer that has been 150 MPH many times and ran 9 second 1/4 miles on a naked bike drag, racing a cart is pretty cool!

That said im a nube when it comes to electric power, i have been reading about motors controllers etc. If i have a stock Y2K DS 48 volt cart and i want to run say 25 MPH and kick the pshit out of the other grumpy..old men in the culgesac do i need to change the motor or controller or both? Give reasons for each if you would. I forgot to mention i am a cheap *** so a mega buck cart aint in the plan endless spending on toys aint happening anymore.........
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Old 05-09-2011, 05:27 PM   #2
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Question Re: Motor, Controller.....??

Electric 101. For a stock 48 volt cart.

Controller will give a cart more torque on the same voltage with nothing else changed.

Motor will make a cart faster on the same voltage.

More voltage will make it even faster. As in a typical motor build. Cubic inches mean speed. Stock rear end,motor and a 72 volt controller will make a stock motor scream. But with that it has it's limits as well it can be over reved and blow it apart.

A upgraded controller and motor together gives you quicker speed. What I mean is it will reach the top end quicker because of the torque the controller added to the motor asking for amps.
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Old 05-10-2011, 07:50 AM   #3
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Default Re: Motor, Controller.....??

1. So to get apx. 25 mph i need to change the controller to what a 48 volt 400 amp and a motor that can handle more amps and spin faster.

2. What RPM can a factory 48 v motor spin before it grenades?

3. If im thinking correctly the controller is the equivalent of a carb on an ICE and it controlls the amperage going to the motor.

4. How would a 72 volt controller help a 48 volt cart?

5. I understand by changing the map on a stock IQ cart you can gain about 6 mph by spinning the motor faster which is apx 50% so is that the safe limit to push a stock motor?
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Old 05-10-2011, 09:55 PM   #4
72 volts!
 
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Wink Re: Motor, Controller.....??

72 volt cart with a 275 amp controller will run circles around a 48 volt 700 amp controller. Most motors will gernade around 5500, 6000 depending on motor. This is at full speed for a long distance. Stock motor maybe even less.
I had a 4600 RPM in the mud buggie when I first built it. I was running around 45MPH when it gernaded. I guess over 5000 RPMS.

More voltage less amps! Less voltage more amps! to get the same results.
If you go with 72 volts make sure the motor will handle it. Robby or D&D motors would be my choices.
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Old 05-11-2011, 08:23 AM   #5
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Default Re: Motor, Controller.....??

Andy, is number 3 correct? Is 3600 RPM the stock speed or 1750?

I understand that more volts the better, what i dont understand is how a 72 volt controller on a 48 volt cart will help there is only 48 volts unless you add more batterys.

On a stock 48 volt motor how much voltage and amps will they take?
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Old 05-11-2011, 08:35 AM   #6
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Default Re: Motor, Controller.....??

Yes the suggestion was to add more voltage.
Amperage = Torque
Voltage = Speed

What are you going to use this cart for?
How many people will it seat?
What size tires?
What type of terrain?


Typically....this is not a thing that can be cheaply done.
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Old 05-11-2011, 10:12 AM   #7
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Default Re: Motor, Controller.....??

Scotty, i plan to ride around the neighborhood and some mild off roading and i want to beat the other carts in the area...at the same time learn about electric cars, plenty of experience in racing ICE bikes. Electric cars seem to be the wave of the future so i figure this is the best way to learn about them.

I will ask you the same questions what is the stock rpm of a 48v CC cart, how much voltage and amperage will they take? Can you just add another 12v battery to a stock set up for more voltage? Is the controller the carb... on an electric cart?

In due time i will probably replace the motor and controller and what ever else is needed for speed but for now i want to know how to get the most from a stock...setup. If i toast the motor...time for an aftermarket or modified one. 215-40-12 tires.
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Old 05-11-2011, 06:12 PM   #8
72 volts!
 
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Question Re: Motor, Controller.....??

Don't use a 12 volt with a set of 8 volts or 6 volts. The amp hrs are differant and the charge rate is differant. You will burn up the 12 volt very quickly if you do use it.

If you want a 48 a little faster get a controller that handles up to 72 volt and it will handle anything between 48 & 72. You could add 1 or 2 more 8 volts and make it a 56 or 64 volt cart. The 48 volt motor would be fine.
A stock 48 volt motor is rated as a 36 volt. 8000RPM max safe for 60 minutes basiclly. You start getting over 4600RPM on any stock motor and it's going to gernade on you.
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Old 05-12-2011, 07:04 AM   #9
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Default Re: Motor, Controller.....??

Andy, you said a 48v motor is rated as a 36v???? And Its 8000 rpm max safe but it will grenade at 4600 or above??? Dont understand either.

Is the controller like a carb on an ICE???
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Old 05-12-2011, 07:25 AM   #10
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Default Re: Motor, Controller.....??

Go to alltrax.com They have a lot of info you can read about how electric vehicles work.
The controller is a valve that regulates how much amperage the motor can draw. Connected directly the motor would draw all the available amperage.

Basically any stock motor can be safely run on 48v. Above that they become a little less reliable. Best to have something built for 60 or 72v IMHO.
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