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General RC Car & Truck discussion General Discussion about R/C topics

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Old 11-03-2005, 07:29 PM   #11
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when u accelerat HARD (as in a race, off the line or out of a corner) the esc needs more juice... now if ur turning u can overload the servo and hurt it... the capacitor keeps an even amount of energy stored for the servo so u dont fry it....
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Old 11-03-2005, 09:10 PM   #12
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You guys talking about the power capacitor??? The big cap is soldered on the input voltage going into the ESC (-/+ power from battery). An ESC in an RC car uses pulse width modulation, meaning you are really pulsing power to the motor to control it's speed. You know when you hear the term "drive frequency", this is exactly that - how many times does a second, the esc pulse power to the motor to drive it. You don't decrease voltage to the motor to change speeds, you feed full voltage but at a varying frequency to change speeds. However, during each pulse, you are drawing a huge current from the battery, when you draw current, the voltage drops. Imagine if your drive freq was 2KHz, the voltage feeding your speedo is pulsating at 2KHz!!! In some cases it can hurt the electronics. The power capacitor stabilizes the input voltage to the speedo so the pulsations is not as bad!...
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