Question on ESCs: Help!
10-26-2002, 06:50 AM
#1
Question on ESCs: Help!
Hi everyone, I'm a bit curious as to ESCs.
anyone can tell me why there is such a thing as motor limit. eg 12-turn limit. is the reason the esc cannot handle lets say, 9 turn motors because of the amp draw of the motor is too high during low speed(or is it high speed?), or is it the ESC is unable to dissipate heat fast enough to handle the 9 turn motor at low speeds and thus burns out?
is there a way to calculate what esc can be used for a certain motor if i know the max amp load of the motor and the rated current of the ESC?
thx in advance!
anyone can tell me why there is such a thing as motor limit. eg 12-turn limit. is the reason the esc cannot handle lets say, 9 turn motors because of the amp draw of the motor is too high during low speed(or is it high speed?), or is it the ESC is unable to dissipate heat fast enough to handle the 9 turn motor at low speeds and thus burns out?
is there a way to calculate what esc can be used for a certain motor if i know the max amp load of the motor and the rated current of the ESC?
thx in advance!
10-26-2002, 06:17 PM
#4
most escs on the market alreadi have the motor limit stated,it's should of like a market standard,...eg the lrp quantum competition has a limit of 5 turns...
should b of no problem when u obey the instructions n keep within the limit...
should b of no problem when u obey the instructions n keep within the limit...
10-26-2002, 06:31 PM
#5
Originally posted by Nipple
How do you know the Max Current draw of your Motor??
The Pulse draw to get it spinning or Continous at loaded or unloaded??
How do you know the Max Current draw of your Motor??
The Pulse draw to get it spinning or Continous at loaded or unloaded??
10-27-2002, 01:15 AM
#6
Re: Question on ESCs: Help!
Originally posted by huasze
Hi everyone, I'm a bit curious as to ESCs.
anyone can tell me why there is such a thing as motor limit. eg 12-turn limit. is the reason the esc cannot handle lets say, 9 turn motors because of the amp draw of the motor is too high during low speed(or is it high speed?), or is it the ESC is unable to dissipate heat fast enough to handle the 9 turn motor at low speeds and thus burns out?
is there a way to calculate what esc can be used for a certain motor if i know the max amp load of the motor and the rated current of the ESC?
thx in advance!
Hi everyone, I'm a bit curious as to ESCs.
anyone can tell me why there is such a thing as motor limit. eg 12-turn limit. is the reason the esc cannot handle lets say, 9 turn motors because of the amp draw of the motor is too high during low speed(or is it high speed?), or is it the ESC is unable to dissipate heat fast enough to handle the 9 turn motor at low speeds and thus burns out?
is there a way to calculate what esc can be used for a certain motor if i know the max amp load of the motor and the rated current of the ESC?
thx in advance!
10-27-2002, 05:23 AM
#7
i see...so the motor limit is due to the FETs and not to the max current the ESC can take.
just 1 more question on thermal protection: does this mean that, if i use dual motors on a, lets say, top end esc with thermal protection like the LRP F1 pro or the ipc 7.1 which have no turn limit for 1 motor but don't specify 2 motors, and the esc cannot take it, the thermal protection will kick in and i don't conk off the esc. ie. so i simply try-try the dual motor config until the esc says..."STOP ITS TOO HOT!"
just 1 more question on thermal protection: does this mean that, if i use dual motors on a, lets say, top end esc with thermal protection like the LRP F1 pro or the ipc 7.1 which have no turn limit for 1 motor but don't specify 2 motors, and the esc cannot take it, the thermal protection will kick in and i don't conk off the esc. ie. so i simply try-try the dual motor config until the esc says..."STOP ITS TOO HOT!"
10-27-2002, 04:36 PM
#8
not all esc r built 2 take in more than 1 6 cells batt pack,u will have 2 check the esc's spec 1st.
10-27-2002, 06:07 PM
#9
Originally posted by huasze
i see...so the motor limit is due to the FETs and not to the max current the ESC can take.
i see...so the motor limit is due to the FETs and not to the max current the ESC can take.
As for twin motor load, (not all motor comes with dyno tag) look for current it draws, combine both n should be lower than ESC current (amps) handling spec.
The easy way is take from ppl experience, copy them. Or your method of trial and error-but this would be costly...
all providing that you have the correct gearing.
hope this helps
Last edited by GTO2; 10-27-2002 at 06:10 PM.
10-27-2002, 06:29 PM
#10
as mentioned by ijnek, most esc cannot handle 2 x 6 cell packs... some esc like the super rooster is able to handle up to a 10 cell pack. if u put the 2 x 6 cell packs in parallel, it shouldn't be a problem but u are not increasing ur voltage (top speed), just your capacity (run time).
i'm not sure about this but i think not only the esc will be fried if u pump in too high a voltage, but also the reciever as well. cos the reciever is powered thru the esc. to achieve more cells without fried reciever, u can try powering the reciever seperately by a rx pack. to do this, u will have to remove the red wire from the esc to the reciever leaving only signal and ground. even by doing this, the number of cells will still be limited by the esc FET rating. this just insures the reciever.
i'm not sure about this but i think not only the esc will be fried if u pump in too high a voltage, but also the reciever as well. cos the reciever is powered thru the esc. to achieve more cells without fried reciever, u can try powering the reciever seperately by a rx pack. to do this, u will have to remove the red wire from the esc to the reciever leaving only signal and ground. even by doing this, the number of cells will still be limited by the esc FET rating. this just insures the reciever.
10-27-2002, 08:51 PM
#11
the heart is the microcontroller chip which determines the heartbeat freq
The MircoProcessor Control the FET Switching (On and off).
Then there is a Amplifer to Amplify the current??
If large current but little FET,the FET gets hot, and burnt out. So More FET mean can support high current= higher end ESC???
Last edited by Nipple; 10-27-2002 at 08:59 PM.
10-28-2002, 01:27 AM
#12
Originally posted by Nipple
I thought it is the FET that produce the output Freq .
The MircoProcessor Control the FET Switching (On and off).
I thought it is the FET that produce the output Freq .
The MircoProcessor Control the FET Switching (On and off).
10-28-2002, 07:15 AM
#13
hmm so if the combined total current of the 2 motors don't exceed the max limit of the ESC, then i'm likely to be in business, if not the ESC will have that auto-protection feature turned on rite? LRP users, tell me so...! i got a LRP F1 Bullet(the old one before F1 Pro)
if can confirm then i will go get a couple of 11 to 13 turn motors to play with...
temp for me is no problem, i can get custom made heatsinks and install fan if necessary.
if can confirm then i will go get a couple of 11 to 13 turn motors to play with...
temp for me is no problem, i can get custom made heatsinks and install fan if necessary.
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