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Can i use capacitors to run a motor instead of a battery and how do i control the voltage to the motor?
Wiki User
∙ 12y ago
You COULD use a huge capacitor, like a bank of 1-farad car stereo caps, to run a motor, because a cap is basically a battery that doesn't hold very much electricity. And if you did it, you'd control the voltage to the motor the same way you would with a battery--resistors, potentiometers, voltage regulators, whatever you like.
I wouldn't do it, though, because a capacitor doesn't hold enough electricity to let the motor run for very long.
Quick note: single phase AC motors all have "run capacitors" and "start capacitors" but those are something else entirely.
CommentI don't think that you will ever find a 1-F (one farad) capacitor! A farad is a HUGE amount of capacitance! Practical capacitors are expressed in picofarads (10-12 farad) or microfarads (10-6 farad), never in farads! Bear in mind that capacitance is directly proportional to the area of its plates -so imagine how huge a 1-F capacitor would have to be!
Running a motor from a capacitor is completely impractical. A capacitor will completely discharge in 5 CR, where Cis the capacitance of the capacitor and R is the resistance connected across its plates.
So, let's pretend from one moment that you can find a 1-F capacitor and let's say the motor has a armature resistance of, say, 50 ohms (quite high!), then the capacitor would completely discharge in 5 x 1 x 50 = 250 s, or a little over 4 minutes!!!! However, if we used a capacitor with a realistic value of capacitance (in microfarads), then the discharge time would be measured in milliseconds! So, not much use for driving a motor!!!
Wiki User
∙ 12y ago
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