Larry
Senior Heliman
Location: SE Florida
| Hey all,
I am starting to figure out how the n pot setting now works.
here is a summary.... values can be substituted in the equations as needed for different gear ratios and motor....
the 24-5 turns 435/volt of power.......
the 24-4 turns 570/volt......
What we need to do is determine where the voltage of the pack is at different times to determine the begining, middle, ending rpm range....
I am using a 10s lipo pack.. it starts at 42 volts but of course doesnt hold it.... Lets say we average 40 volts..........Im not sure if this is accurate but i will cycle the 10s4p tonight on the computer to figure this out.....
24-5 motor analysis with 25 tooth pinion....
so
40 * 435 * .80 efficiency/reserve factor == motor speed 13920
then we take the motor speed over to the next equation solving for speed motor..
13920= rotor speed *8.8
Rotor speed = 1581 maximum sustainable rpms with reserve for loading....... assuming that the voltage is 40 volts... i know we start at 42 and not sure where we average or finish off at...
Then we take the 13920 speed into the n pot equation..
tick =1+(13920-2500)/1500
=8.61 ticks on the n pot....
with this setting as long as the voltage does not go below 40 volts the controller will have no problem holding the rpms even with load........any voltage above 40 will just be reserve but the governor will hold the rpms at 1581 based on the n pot setting and the transmitter at 100% throttle....
I feel like a mathematician....
BTW Gear ratios are as follows
8.8 25 tooth
9.16 24 tooth
9.56 23 tooth
larry |
