robotmickey
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Okay, so I have been making an electric Radio Flyer go kart, and everything was working fine, until I removed the throttle connecter to take it off the kart, then when I put it back on and turn the machine on, it takes off full tilt!!
So after a lot of experimenting with an ohm/volt meter and a power supply, I have deduced how these work and why it takes off.
Okay, so the way it works on my go kart is the controller sends something like 11.6 volts to the throttle, and all the throttle does is send it some portion of it back, like 3.8 or 4.5 or whatever. When it is working properly, the controller will start to turn the motor at around 3.2V, the slightest turn of the throttle, just until the wheels barely start to turn. Then, at WOT the controller sees back something like 6.4V, even though the controller supplies the throttle with 11.6, I figure this is some kind of governing?
Anyway, the problem is that the throttle is letting through like 3.8V without even touching it, so the controller thinks that someone is turning it and tells the motor to start going. So the solution was to put in a resistance to bring the voltage down, so the motor wouldn't start when the throttle wasn't being turned. The only problem was that then it brought down the top end too. (Again I still don't know why it suddenly stopped working.)
So we came up with another plan:
We designed a circuit that would bring down the initial voltage, but then have an amplifier in it so that the top end wouldn't be effected, in fact, instead of going to just 6.2V it should now go to 9.2V, making the motor go faster.
I feel like I didn't explain that very well, feel free to ask questions and what not.
So after a lot of experimenting with an ohm/volt meter and a power supply, I have deduced how these work and why it takes off.
Okay, so the way it works on my go kart is the controller sends something like 11.6 volts to the throttle, and all the throttle does is send it some portion of it back, like 3.8 or 4.5 or whatever. When it is working properly, the controller will start to turn the motor at around 3.2V, the slightest turn of the throttle, just until the wheels barely start to turn. Then, at WOT the controller sees back something like 6.4V, even though the controller supplies the throttle with 11.6, I figure this is some kind of governing?
Anyway, the problem is that the throttle is letting through like 3.8V without even touching it, so the controller thinks that someone is turning it and tells the motor to start going. So the solution was to put in a resistance to bring the voltage down, so the motor wouldn't start when the throttle wasn't being turned. The only problem was that then it brought down the top end too. (Again I still don't know why it suddenly stopped working.)
So we came up with another plan:
We designed a circuit that would bring down the initial voltage, but then have an amplifier in it so that the top end wouldn't be effected, in fact, instead of going to just 6.2V it should now go to 9.2V, making the motor go faster.
I feel like I didn't explain that very well, feel free to ask questions and what not.