Electric Vehicle C

[MontyBuilder]

Thanks that's awesome
!!!!!!!

[MontyBuilder]

i understnad that well
ty a lot
one more question

i have planned and designed a way to put all of that onto my vehicle
i just want to know, does the "micro swtich" depicted in the picture act as the momentary switch that you recomended... are they the same thing?
yes im just as stupid as I sound, im new to this stuff

[Dark Sabre]

Yes, the "micro switch" is the momentary switch. You can get one at Radioshack if you don't have one around.
One like this: http://www.radioshack.com/product/index ... PerPage=60
I'd avoid one with a roller (like: http://www.radioshack.com/product/index ... PerPage=60).

If you didn't gather from earlier, these kinds of switches have three terminals P (I call it power), NO (normally open), and NC (normally closed). They are usually labelled as such on the plastic housing. If you put the (+) from a battery on P and hooked NO to Motor A and NC to Motor B (and the other terminals of the motors to (-) on the battery), then Motor A (NO) wouldn't be running and Motor B (NC) would be. When you pressed the switch, Motor A would start and Motor B would stop. In the case of the wiring diagram earlier, you are hooking the switch in such that it is normally powering the motor, but when the wingnut presses the switch, it connects the two motor terminals together.

[MontyBuilder]

is the black wire that comes from No on the momentary/micro switch going to "connect" with the other black wire between the negative end of the motor and the negative end of the connecter and battery back. What happens at that intersection?

[andrewwski]

It just means that you're connecting that pin to ground (negative). Doesn't matter where you physically connect it to, as it's going to be a negative-ground system. Theoretically you don't need that wire though as you only need to break the circuit.

[MontyBuilder]

It just means that you're connecting that pin to ground (negative). Doesn't matter where you physically connect it to, as it's going to be a negative-ground system. Theoretically you don't need that wire though as you only need to break the circuit.

so it isn't necessary
i can take it out
hb

[Dark Sabre]

Right, you don't actually need it unless you are wanting to try the eddy-current brake.

"A simple application of Lenz's law can be seen in the eddy current brake. A simple eddy current brake can be easily made by connecting the two terminals of a DC motor."

The motor stopping and the wingnut jamming against the switch will probably be enough, but try it the other way if it isn't.

[MontyBuilder]

i thought exactly the same thing

thanks that's great

ive designed it on the paper,
and I've found the best way to fit it on a car

the only other thing to do before starting to build is trying to equalize the mass on both sides of the car so it goes striaght, is that actually necessary since the car is going at a very low velocity?

[MontyBuilder]

oh
how much $ is a momentary switch?

[andrewwski]

Probably $3-$5 retail.