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An other thing you will have to design/buy is for the charging of the Capacitor, you will have regulate the charging current if you do not want to surcharge the alternator/electrical system of the car when they are empty/low voltage. The system you are designing is similar to what Im use to design, where you need a constant current input in the cap and a large discharge current in short burst at your load.
When you will designing your power stage(depending on what type of motor you choose), always think that wire in the motor are like long water pipe, you can stop feeding them abrutly, or you will endup with high voltage spike destroying the FET
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