18-12-2012, 04:03 PM
[Potential thread hijack - sorry. ESC info]
Well, you know me by now Jason. "Have I... got a link... for you" (using my best Tony Packard Holden advertisement voice).
I believe this information relates to your ESC temperatures as I don't think CC Ice series have AFW (Active Free-Wheeling). Also check out the other videos from this guy. He is a legend in the electric helicopter forums. There are videos by this guy (Tony) where he explains why some ESCs get hot and others don't (again, AFW) under same/similar loads.
To translate the contents of the video for the non-electronic folks, what this person is saying is that when an ESC is controlling the speed of a motor, it is switching voltage on and off very rapidly (thousands of times per second). Each time the power is switched off to the motor, a magnetic field collapses that generates power as it does so. This power is bled off as heat in the ESC (to get rid of it). The more current you are drawing and if you are at mid throttle, the most switching of this power will occur (and therefore a lot of heat).
With Active Free Wheeling, the current from the collapsing magnetic fields are turned back in to the motor with no heat being created in the ESC. The motor gets hot instead (but it is designed to handle it easy). The ESC stays quite cool if it has Active Free Wheeling. Unfortunately, AFW is not found in low cost ESCs.
Looking at your graph again I think you need to get some airflow over the heatsink. Temperature is usually measured on the heatsink (internal side). I think that would knock about 30 deg C off the temp. I also can see you flew on a stinking hot day as the heatsink was logging 35 deg C before you even throttled up. I believe with ventilation you will be flying with much cooler temps. I don't think CC will come back to you with any useful information other than the ESC is working fine (albeit "hot").
http://www.youtube.com/watch?v=uqzOQGiwGnE&list=UU7lc_DFDwD3wDHd-ixH1gfA&index=3
Well, you know me by now Jason. "Have I... got a link... for you" (using my best Tony Packard Holden advertisement voice).
I believe this information relates to your ESC temperatures as I don't think CC Ice series have AFW (Active Free-Wheeling). Also check out the other videos from this guy. He is a legend in the electric helicopter forums. There are videos by this guy (Tony) where he explains why some ESCs get hot and others don't (again, AFW) under same/similar loads.
To translate the contents of the video for the non-electronic folks, what this person is saying is that when an ESC is controlling the speed of a motor, it is switching voltage on and off very rapidly (thousands of times per second). Each time the power is switched off to the motor, a magnetic field collapses that generates power as it does so. This power is bled off as heat in the ESC (to get rid of it). The more current you are drawing and if you are at mid throttle, the most switching of this power will occur (and therefore a lot of heat).
With Active Free Wheeling, the current from the collapsing magnetic fields are turned back in to the motor with no heat being created in the ESC. The motor gets hot instead (but it is designed to handle it easy). The ESC stays quite cool if it has Active Free Wheeling. Unfortunately, AFW is not found in low cost ESCs.
Looking at your graph again I think you need to get some airflow over the heatsink. Temperature is usually measured on the heatsink (internal side). I think that would knock about 30 deg C off the temp. I also can see you flew on a stinking hot day as the heatsink was logging 35 deg C before you even throttled up. I believe with ventilation you will be flying with much cooler temps. I don't think CC will come back to you with any useful information other than the ESC is working fine (albeit "hot").
http://www.youtube.com/watch?v=uqzOQGiwGnE&list=UU7lc_DFDwD3wDHd-ixH1gfA&index=3