Quote:
Originally Posted by seg9585
Can you explain how running 6 CIMs at 40 amps each will not trip the 120amp breaker switch after a few seconds?
Did you use the JVN Design calculator to figure your expected motor currents with that configuration? Although I don't have the other specs that I need of your design (wheel diameter, weight on wheels), I did some guessing and the resulting "pushing match" current (in this case accelerating from 0) runs up to 152 amps per motor.
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6 CIMs at 40 amps draws 240 amps. AndyMark's data sheet for the 120 amp breaker states that at 200% of the rated current (lets say a bit more because of other electronics) it can last a bit less then 10 seconds. It takes less then 10 seconds for me to reach 75mph. And the 50 amps only happen for like half a second when switching, and the cim snap breakers can draw that for a couple seconds.
wheel diameter is 4in
weight is around 50lbs (the 10lbs for electronics is added in, but not shown)
the pushing match current is if you are pressed up against a wall. in which case, this drivetrain is more then likely power limited which is why the current drawn is so high.
Quote:
Originally Posted by GeeTwo
How much runway and time do you calculate that you'll need to reach top speed?
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Im a perfect world with no opposing force, it would take a 75m runway to reach 75mph. Im guessing it would be around 100 irl.
i'll post all of my calculations when i get home.