Hi all!
Sorry if this seems to be a stupid question, but I am beginning my EE journey.
I am working on a concept project and I am looking to take it to the next stage. Could someone explain to me how I can implement come kind of controller which will switch the motor on when the battery powering the system is becoming drained, say 6v, and then switch the motor off when the battery is fully charged?
may the moment, I need to manually switch the motor on and off when using.
Thanks in advance.
Matt

 

It sounds fairly easy,
but without any details,
and an good explanation of what this arrangement is supposed to do exactly,
it's hard to give any suggestions.
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.
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Battery type and voltage. 12V automotive?
Motor voltage and current? 120vac 1A or 12V 2A?
6V=drained battery. What power does the motor run on when there is no battery left?
Battery=charged? Need battery type and voltage to know.

 

For starters define "the motor" and what is does relative to battery charging, and also define "The Battery".
And a rather detailed description of how switching the motor on relates to the battery becoming charged again.

And that sort of question is not at all similar to any of the class questions that I had in the first two years of engineering school.
By the time we got to that sort of stuff we already understood circuit theory very well, as well as active devices like tubes and transistors.
The fact is that almost none of the folks here are able to read the missing information from the minds of those posing questions. So the details really do matter. Without details random guesses abound.

 

If it's a 12V lead-acid battery than 6V doesn't equal drained battery, it equals dead battery.
Look in the battery datasheet - drained battery is usually around 10.8V

 

Here is a guess, which is that "the motor" actually means an internal combustion engine of some kind powering a generator of some kind to somehow apply power to a charging circuit of some kind that charges "the battery" that powers "the system."
If "the motor" does not have a separate starting power source, then probably nothing useful will happen.

And it is not at all clear if "The Motor" is actually an engine (aka prime mover) or an electric motor. There is a whole lot of difference.
We can guess, but I will not bother to guess what the intention is. Let the person explain with more specific words.
So rather than make guesses I can wait for the missing information.

 

My guess? He wants the motor to run the generator that will charge the battery.

 

It has been a very long time since an electric motor was used to spin a generator to charge a battery. That is the reason for my guess being a gas engine to spin an alternator to charge the battery. Or it might be the engine (motor) in a car, or possibly a larger boat. The system in a boat that starts the APU is not simple at all.. (APU= Auxiliary Power Unit)