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No, that doesnt look right... Potentiometer Expert Needed! Answered

Hi All!

My brother and I are building an e-bike and we THINK we know how to attach a throttle, but it might blow up the battery... if worse comes to worse then we have a toggle button we can install but it's not really ideal.

I've attached a circuit diagram below of how everything goes together, but this is my thinking;

With nobody touching the throttle, in my circuit, wont i have a current flowing from the battery anode via the potentiometer straight back into the battery cathode? This results in a huge waste of energy doesnt it? And the battery would drain even when the bike is stored in a hallway overnight. 

So, does anybody know if this circuit will work? i need it to take energy from the battery ONLY when active.


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steveastrouk
steveastrouk

5 years ago

No, it won't work. Look for real motor controllers.

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Downunder35m
Downunder35m

5 years ago

Is that for a real E-bike or just a tabl top model?
A potentiometer capable to handle the currents of these motors would bemade from quite thick Nichroe wire - and it would act as a really good heater in the winter.

Maybe you want to do some homework with Google on motor controllers or check ebay for scooter motor controllers that fit the voltage and amps of your motor(s) - which you failed to mention.

By the way: you use a resistor-voltage-devider (potentiometer in your case) for volage but not for amps - it's a signal thing not a power thing.

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Tsimbilakis
Tsimbilakis

5 years ago

This is the circuit, whether i use the upper left or upper right version depends on the throttle in question.

Untitled Sketch 2_schem.png