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Old 04-05-2014, 03:45 PM  
bean-aid
So Fucking Banned
 
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Join Date: Jun 2011
Location: the land of woke sleuths
Posts: 16,493
Quote:
Originally Posted by Nathan View Post
BTW, re your question about power and battery life...

The work being done today to make electric motors more efficient has to do with:

1) less loss in friction and similar other forces.
2) Bigger batteries with higher power density
3) Batteries that can be charged faster.

In general though, a battery has X amount of energy and a motor converts this energy into rotational forces or torque and horsepower. Horsepower is nothing else than work, which is Watts. Watts = Volt * Ampere. So, a 1.5V battery that stores 2000mAh (like your AA does) will NEVER EVER be able to generate more than 1.5V*2000mAh = 3000mWh or 3Wh. Just as an example, a 200 horsepower petrol engine, is the same as 150kW or 150000W. So to power an electric engine that generates 200horsepower of work for 1 hour straight, or 150kW for 1 hour straight would require 150kWh of energy, or 150000Wh of energy, or the equivalent amount of energy as in 50000 AA batteries.

This is physics. It can not be changed or pushed "better" this is AS GOOD AS IT GETS. This is actually WORSE in real life since you have losses everywhere.
Well sheetz... I don't know... saw it on youtube and yes, seems to be a very common and simple motor not used because the amps it draws. Way more energy then justifies the motor.

...HOWEVER...

I am telling you, I just tried it again and pulled apart the bottom so no way it touched the magnet. It started spinning right away.

I also ran down the first battery... took about 12 minutes to kill it.
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