Hi all I am trying to run a 12VDC 100w motor on me sons gokart but I have a problem.
I have the motor a 12V 9amp/hr battery and a switch as throttle but it has no torque.
Even if I lift the wheels off the floor it takes a few seconds to spin up and then it goes like the clappers.
The motor came from a scooter but I have been reading it all so came with a controller whice I dont have .
Does the controller increase the amps to in turn increase torque.
If I do need a controller can I make one simple enough or are they cheap?.
A 100 watt motor is pretty weak for a gocart. My brother has RC toys that run far higher wattages than that.
I set up a electric scooter for my niece that is running a 600 watt motor and thats about right for her 75 pound body and the 25 pound scooter. For me and her dad however, at 250 pounds, it doesn't get very far very fast when we ride it.
Any idea what yor battery voltage pulls down to when you load it up?
The motor came from a scooter and my mate rode it before ripping it a part he said it went really well with him on it and he is a big man but now it has no power at all.
I dont know the voltage when under load I can check I assume I hook up me multimeter to battery run engine and see what the volts drop to??????????.
Yes you need to try it with a bigger battery.
Also you have not told us how you geared it.
The gearing is vary important.
Sounds like it is not a geared motor.
I just spoke to my mate and he said he had it working using a car battery.
I am still convinced it has one of them controller boxes before on the scooter.
The motor is not geared just the gears fron the original gokart.
I have noticed all so that when I lift the kart off the floor and run the wheels all the wires get hot and the connections is this because the motor is pulling to much amps then the wires can handle or because the battery cant handle the rqiured amps needed?
EDIT
Though if I wire the motor directly to the battey the motor wires still get hot so must be the battery surely?
If the wiring is large enough (12 ga should be more than enough) and still gets hot without any load on the motor the motor is most likely cooked and has partially shorted windings in it.
It may be that without the controller you are giving it to much power but more likely it is a bad motor if you are shore it is a 12 volt motor and you are running it off 12 volts.
Is there any friction in the drive? If you take the motor out or disconnect the drive and run it with nothing connected to it do the wires still get hot?
Unfortunately if its drawing high amps at no load it is not a broken wire issues but rather the insulation has been burned right off them and they are shorted out in multiple places. A 100 watt 12 volt motor should only draw 1 - 2 amps no load and around 9 at full rated load.
Odds are if you take it apart you find the commutator is burned blue and the enamel insulation on the windings is burnt black and falling apart.