Idea to Use brushed motor dyno for brushless
01-25-2008, 04:37 PM
#31
I am curious if the amound of load place on the shaft during a dyno run on a novak brushless motor is enough to prevent damage to the rotor as novak has made it known that free reving the motor can cuase damage....
I know that the aluminum flywheel does not put much load on a shaft and the RPM's the motor turns during a dyno pull is close to almost free reving just a thought here whats the general concensus on this??????????is it worth the risk of damaging a motor to get info that to me isnt all that important with a brushless motor esecialy when all your going to do is make gearing changes from the info you get from a dyno (whitch with on track testing you can get the same info it just takes longer but heah it's track time and we all know what practice does) or you can buy many motors and use it to find the one with the best #'s.....my point is with a brushless motor you can practice all you want and make gearing and timing changes etc and compare lap times something you couldnt accuarately do with brushed and to me spending time on the track is way more valuable then sitting on your butt in front of a dyno and grunting like Tim Allen when your motor is at peak RPM arhhhhh arhhhhh ooooohhhh.........................
I know that the aluminum flywheel does not put much load on a shaft and the RPM's the motor turns during a dyno pull is close to almost free reving just a thought here whats the general concensus on this??????????is it worth the risk of damaging a motor to get info that to me isnt all that important with a brushless motor esecialy when all your going to do is make gearing changes from the info you get from a dyno (whitch with on track testing you can get the same info it just takes longer but heah it's track time and we all know what practice does) or you can buy many motors and use it to find the one with the best #'s.....my point is with a brushless motor you can practice all you want and make gearing and timing changes etc and compare lap times something you couldnt accuarately do with brushed and to me spending time on the track is way more valuable then sitting on your butt in front of a dyno and grunting like Tim Allen when your motor is at peak RPM arhhhhh arhhhhh ooooohhhh.........................
01-26-2008, 01:40 AM
#32
Actually you'll have to change the inertia settings in the Robitronic dyno software since the normal settings are for a heavy brushed armature and not a lightweight brushless rotor. The figures you get for brushless, without altering those inertia settings, are not comparable to any brushed measurements whatsoever.
But it's still a good comparison the way you do it now, just don't try to compare to brushed and don't consider the numbers you get as real.
But it's still a good comparison the way you do it now, just don't try to compare to brushed and don't consider the numbers you get as real.
01-29-2008, 04:08 PM
#34
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Were using the CE Turbo Dyno - output hooked to the input of the ESC (using both GTB and LRP) with the ESC switch on, when the dyno is started it puts a set voltage to the ESC and with the radio throtte held full, the motor spins.
Check LEFTHANDER-RC.com under brushless
Check LEFTHANDER-RC.com under brushless
I checked Lefthander, I didn't see information on the dyno setup.
02-08-2008, 09:51 AM
#35
Good point there Reto about the inertia settings. I will have to have a play with the setting to see how much it varies the torque.
Would be handy if I had the inertia values of the varius rotors.
I did a test of an lrp compared to gtb and posted the results in the electronics forum.
Would be handy if I had the inertia values of the varius rotors.
I did a test of an lrp compared to gtb and posted the results in the electronics forum.
02-08-2008, 10:30 AM
#36
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Can someone point me to some instructions for connecting a brushless to a dyno? Thanks!
02-08-2008, 11:29 AM
#38
02-08-2008, 02:55 PM
#39
05-10-2008, 02:24 PM
#40
05-10-2008, 03:05 PM
#41
Torque was not fixed, you are looking at the effect of the current limiter.
It can be set in: file - preferences - current limiter
While you are there you might want to change the rotor inertia setting, default is 4.2 so maybe 2 to 3 would be better for brushless.
It can be set in: file - preferences - current limiter
While you are there you might want to change the rotor inertia setting, default is 4.2 so maybe 2 to 3 would be better for brushless.
05-10-2008, 08:38 PM
#42
I saw some of the brushed ESCs like KO PROPO VFS-1 do include a current limiter, range from 40-240 amp. but not any brushless system has one yet?
05-10-2008, 08:47 PM
#43
so what you saying is the current limiter is intergated at the robtroincs.
anyways, Really thx for showing the test data, I have a much better idea about how the motor works now.
great test, it helps a lot to chose the right motor for each track.
anyways, Really thx for showing the test data, I have a much better idea about how the motor works now.
great test, it helps a lot to chose the right motor for each track.
05-11-2008, 04:47 AM
#44
At the Robitronic dyno there is an adjustable currentlimiter integrated. Could be adjusted in the software.
05-11-2008, 01:06 PM
#45
Yes that's correct, the dyno unit has the current limiter built into it.
I know the tekin has current limiting but also maybe the gm genius.
I'm looking forward to Tekin's sensored system which should have a current limiter. I also really like this feature and I think it would be very usefull for brushless due to the obscene amounts of torque they can create.
Glad you like the info I posted, I plan to do more work but it is on the back burner for now.