Using a capacitor to run a motor

[frank_des_j]

Homework Statement

Hi I'm starting a school project. I need to use a supercapacitor to run a DC motor. How do I wire (to charge and discharge) and calculate the variables for the super capacitor. The capacitor would need to be charged by a generator that would be turned by hand. I think the DC motor could be turned to charge the supercapacitor and then the same motor could be powered by this same supercapacitor. I have basic electronic knowleadge.

 

[Valkarie]

Homework EquationsI'm not sure what equations I need to calculate the variables for the supercapacitor.The Attempt at a SolutionTo wire the supercapacitor to charge and discharge, you will need to use a charging circuit. This can be done with a resistor and diode connected in series with the capacitor. The resistor will limit the current and the diode will prevent backflow of current. The value of the resistor is determined by the desired charge current and the capacitor's capacitance. The diode should have a forward voltage drop of 0.6V to 1V. To calculate the variables for the supercapacitor, you will need to know the desired voltage and capacitance. The capacitance of the supercapacitor can be calculated using the equation C = Q/V, where C is the capacitance, Q is the charge stored and V is the voltage. To calculate the charge (Q) stored by the supercapacitor, you can use the equation Q = I x t, where I is the current flowing and t is the time it takes for the capacitor to charge.