Power consumption BLDC Motors

[hadjrami]

I have a problem with my propulsion system. I am using:

- Alien power outrunner BLDC motor 6374 170KV (powered with 24V). http://alienpowersystem.com/shop/63mm/a ... kv-3200wa/
- Kaplan KC 150mm

It works fine until we reach the full speed and the motor release (a voltage fall and a current that reach 120 amps). I am using a voltage and current sensor that allow me to make real time simple.
The current exceed the maximum current of the motor.
You can find below the logged data. In the file the second column contains the speed (0: full reverse 0.5: middle point 1: max forward speed), the third one the current , and the forth represents the voltage. the same line contain sample of the different quantities token in the same time. the sampling rate is 1 sps.

I didn't understand what's wrong with the brushless motor. I wonder if you accept to give explication of the phenomena according to your point of view.



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[rossrov]

Hello hadjrami. You really need to supply some information regarding the wiring and power supply. Also, telling the forum a bit about your project would assist in getting you help with the problem. Please.
Aside from that, looking at the logged data suggests to me that the motor controller is not getting enough voltage (voltage sag on battery/power supply, and/or voltage drop between battery/power supply and motor controller), and trying to compensate, thus drawing much bigger current to try to get desired RPM. In other words, the battery could be too small and the wires too thin and too long.

[hadjrami]

I am using 6s lipo battery of gens ace (good quality). I am using 10 AWG wiring to extend the esc output wiring but I didn't use long wiring between the battery and the ESC (advise I find it here: http://www.rcgroups.com/forums/showthread.php?t=1869246 and here: http://www.rcgroups.com/forums/showthre ... engin+wire).