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 The World Of Motors and Batteries

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Richy
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PostSubject: The World Of Motors and Batteries   Sat Jul 12, 2008 6:34 am

First off, a huge quote that everyone uses in the rc world, your motor is only as good as your batteries
so if u want to spend money on making your electric rc better start with the batteries!
but, you need to make sure your esc and motor can handle the batteries before you get them.

start with motors since thats what yoshi asked about.
the standard motor that comes with most electric rcs when stock are brushed motors
brushed motors are cheap and wear out eventually and make the motor sliggish, and then need to be replaced
(we are talking at least a year or so depending on how much you drive your vehicle)
motor sizes are rated in "t" generally the lower the number the faster it is, and the more acceleration.
since with drifting you dont do anything but slid you dont need much of a motor to get you going.
generally somewhere between 12t - 15t is good for bashing when off road. of for a fast street car.

Brushless motors, have absolutely no reason to be in a drifter hahaha
they are fully sealed and have no brushes, meaning no maininence.
they generally resemble a 8-10t brushed motors power.
so there really fast, but with the speed comes a price
most brushless motors come attached to a esc that can handle it, in a combo
a well known combo that i have personaly used is the Mamba Max combo from castlecreations, its about $200 for esc and motor.

ESCs! stands for..... Electronic speed controller
aka sends controlled amounts of electricity to the motor.
esc have a motor limit, and a cell limit, so dont run motors it cant handle, and make sure your not shoving too much voltage into it. its possible but thats beyond what u need to be doing lol.

batteries!
NiCD = extinct
NiHM = generally what most use. the cell count determined the power of the battery, the more cells the more voltage. the second number generaly int he thousands range is the mah of the battery or the capacity, the larger the number the longer the run times, and u also get a bit more power with more mah
if your going to get some good high quality batteries i highly suggest you run a connector plug called deans. they wont melt like those white box ones that come on there stock.

the last typ of battery that im gonna tell you about is Lipo!!
its very light, has much more power, and can provide much longer run times
but its quite spendy and you need A LOT of knowledge to know how to safely use them, they can burst into flamies if improperly handled.
ill put it this way, it will move my off road rc at 45mph+ for 30+ minutes.

if anybody is having any heating issues lmk
its normally a matter of bad gearing.
on a pinion - less teeth = more acceleration, less top end colder temps
more teeth is the exact opposite.

EDIT:
understanding which brushless motor is correct for u...
heres the key to electric, the motor has a certain rpm limit you cant go past or else it could break.
most limits are in the 40 - 60 thousand range....
not 100% sure but i think the mamba max motors have a limit of 40k rpm.... same with the vxl motor
so you wana be close but not over.

the 2 important things are the kv of the motor
and the voltage of the batteries.
a 7 cell battery is 7.4 volts
the vxl motor is 3500kv
so 7.4v x 3500kv = 29500rpm
which is no where near what the motor is capable of!
thats why you want more kv
7.4v volts with a 4600kv motor gets you to just over 34,000 rpm
which is getting closer to the motors limit which means your actualy using it.

im running a 3s lipo which is 11.1 volts on a 3500kv motor
which is just under 40k rpm (about 38k rpm)
perfect

so if you have less voltage u want more kv
and if u have more voltage (like me) u want less kv

so that you can stay around the ideal rpm limit and also to keep temps cool
the ideal setup is more voltage with less kv, thats how u run nice and cool and efficiently.



lmk if theres anything else u want me to cover, or somthing in more detail...

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Last edited by Richy on Sun Sep 14, 2008 3:23 am; edited 1 time in total
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PostSubject: Re: The World Of Motors and Batteries   Sat Jul 12, 2008 6:41 am

Wow...thank you very much for that Richy!!!! Im more than positive that people will use this!!! Very good job!!!!!!

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Richy
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PostSubject: Re: The World Of Motors and Batteries   Sun Sep 14, 2008 3:23 am

bump

added some stuff about brushless motors in case any of you get into off road and would like to upgrade to a high powered brushless system!

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