Fun, Learning, Friendship and Mutual Respect
START  HERE


Unregistered
Go Back   HeliFreak > R/C Electronics Support > HobbyWing ESC's


HobbyWing ESC's HobbyWing ESC Support


Reply
 
Thread Tools Display Modes
Old 05-03-2012, 09:56 PM   #1
tokenlefty
Registered Users
 
Posts: 166
 
My HF Map location
Join Date: May 2009
Location: AL
Default 120HV - Ground Strap to motor

After working with the timing I still have a hot esc unless I move the timing very low. I'm not sure where the built in thermal protection will cause the esc to start to shut down or what the maximum temp of the HW 120a HV is but it's running around 150F at 12khz and 15 degrees and it certainly has that hot electronics smell when its back on the ground.

After a lot of research and help from fellow freaks in the 7HV group, running the scorpion 4035-560 at low timing is a horrible idea as it can generate magic smoke quickly.

Which leads me to the question about "grounding" for lack of a better word. I currently have my ESC bolted to the carbon frame. This is the first time I haven't used velcro and a strap etc. The ohms are very low to the motor but it still has some resistance.

So for the point. Should the ESC be left floating (the case not touching the frame) or should I run a wire from the case of the ESC to the motor? And any help on what the shutdown temp of the ESC is would also be helpful. I can't find that information anywhere. So I don't know if 150F is well within spec, near it, or too hi.

Thanks
tokenlefty is offline        Reply With Quote
Old 05-04-2012, 01:23 AM   #2
P.I.Engineer
Registered Users
 
Posts: 3,626
 

Join Date: Jan 2009
Location: Redondo Beach, CA
Default

check all your solder joints
__________________
Compass 7HV(ikon); Gaui X3(ikon)
TX: Fr-Sky Taranis

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
P.I.Engineer is offline        Reply With Quote
Old 05-04-2012, 06:59 AM   #3
tokenlefty
Registered Users
 
Posts: 166
Thread Starter Thread Starter
 
My HF Map location
Join Date: May 2009
Location: AL
Default

The solder joints are basically perfect. I just ran an ohm check on all of them and no resistance in any of them.
tokenlefty is offline        Reply With Quote
Old 05-04-2012, 06:51 PM   #4
chucky21022002
Registered Users
 
Posts: 425
 

Join Date: Jan 2008
Location: Bedfordshire , UK
Default

On a sunny day I flew my 7hv on throttle curve mode because i forgot to put a common ground on the esc when I change my BEC to a flightpack. The max temp I got was 78F at 100% throttle. The location of the esc is completely covered so I decided to install a brushless fan on top of the heatsink which I bough it from a computer shop.
__________________
Copter X Hybrid Fubar
Trex 500 Vbar Trex 600 Vbar
Compass 7HV HC3SX Compass 6HV Vbar
Trex 550 Vbar
chucky21022002 is online now        Reply With Quote
Old 05-04-2012, 08:08 PM   #5
tokenlefty
Registered Users
 
Posts: 166
Thread Starter Thread Starter
 
My HF Map location
Join Date: May 2009
Location: AL
Default

OK I finally had a chance to run a few tests. I just posted this in the 7Hv section but figured I should follow up here also. The timing is set to 12Khz for all timing tests.

Each flight was done from a hover just doing pitch pumps to 10 feet and back to 3 feet for 5 minutes. Then recording the temp as fast as I could get the canopy off after landing. The temperature starts climbing after it's off since the motor doesn't have the fan running on it. So overall these values are close. The ambient air temp outside is 89 degrees.

7.5 degrees Motor 170 ESC 164F
11.25 degrees Motor 170F ESC 163F
15 degrees Motor 150F ESC 143F
18.75 degrees Motor 141F ESC 129F

I stopped at 18.75 as its performance with the governor turned on is incredible. No weird under speed or over speed issues at 18.75 compared to the other values with the scorpion motor. I also just sounds better at this value. Like it's not laboring. Hard to explain but I'm sticking with 18.75 until I get a few flights for real on it.

Thanks for the help.

Chucky what voltage does the fan run at?
tokenlefty is offline        Reply With Quote
Old 05-04-2012, 09:02 PM   #6
chucky21022002
Registered Users
 
Posts: 425
 

Join Date: Jan 2008
Location: Bedfordshire , UK
Default

Quote:
Originally Posted by tokenlefty View Post
OK I finally had a chance to run a few tests. I just posted this in the 7Hv section but figured I should follow up here also. The timing is set to 12Khz for all timing tests.

Each flight was done from a hover just doing pitch pumps to 10 feet and back to 3 feet for 5 minutes. Then recording the temp as fast as I could get the canopy off after landing. The temperature starts climbing after it's off since the motor doesn't have the fan running on it. So overall these values are close. The ambient air temp outside is 89 degrees.

7.5 degrees Motor 170 ESC 164F
11.25 degrees Motor 170F ESC 163F
15 degrees Motor 150F ESC 143F
18.75 degrees Motor 141F ESC 129F

I stopped at 18.75 as its performance with the governor turned on is incredible. No weird under speed or over speed issues at 18.75 compared to the other values with the scorpion motor. I also just sounds better at this value. Like it's not laboring. Hard to explain but I'm sticking with 18.75 until I get a few flights for real on it.

Thanks for the help.

Chucky what voltage does the fan run at?
Hi, it is 12v. Since Im running a flightpack 2s which is 7.4v and regulated to 5.5v I soldered a booster regulator to make it 12v. Brushless fan is so quite and running at 5000rpm so the esc is nice and cool now. I'll upload some pics later.
__________________
Copter X Hybrid Fubar
Trex 500 Vbar Trex 600 Vbar
Compass 7HV HC3SX Compass 6HV Vbar
Trex 550 Vbar
chucky21022002 is online now        Reply With Quote
Old 05-05-2012, 01:52 AM   #7
chucky21022002
Registered Users
 
Posts: 425
 

Join Date: Jan 2008
Location: Bedfordshire , UK
Default

Heres the pics as promised...

Sent from my GT-I9100 using Tapatalk 2
__________________
Copter X Hybrid Fubar
Trex 500 Vbar Trex 600 Vbar
Compass 7HV HC3SX Compass 6HV Vbar
Trex 550 Vbar
chucky21022002 is online now        Reply With Quote
Old 05-05-2012, 12:25 PM   #8
tokenlefty
Registered Users
 
Posts: 166
Thread Starter Thread Starter
 
My HF Map location
Join Date: May 2009
Location: AL
Default

Excellent Mod Chucky. It's interesting that Hobbywing has fans on the Car ESC's since they don't get much airflow. I wonder if we could convince them to have the option for a Heli setup when under the canopy. It would be easy enough for them to implement. They did a good job on the anti-spark connector and the extra capacitor pack.
tokenlefty is offline        Reply With Quote
Old 05-09-2012, 02:13 PM   #9
tokenlefty
Registered Users
 
Posts: 166
Thread Starter Thread Starter
 
My HF Map location
Join Date: May 2009
Location: AL
Default

Just a quick update now that I have a dozen flights on the 7HV. The HW 120HV internal governor is so inconsistent that I have completely given up on it. It needs a major software upgrade but as the performance of the gate circuits degrade with temperature changes it becomes much worse. I'm flying throttle curves now and it works well. I see why the V-bar guys like these with the vbar governor. But I wouldn't recommend the HW internal governor at this point until they make some major changes to it.
tokenlefty is offline        Reply With Quote
Old 05-09-2012, 03:30 PM   #10
tokenlefty
Registered Users
 
Posts: 166
Thread Starter Thread Starter
 
My HF Map location
Join Date: May 2009
Location: AL
Default

Chucky, where did you get the boosted regulator for the fan?
tokenlefty is offline        Reply With Quote
Old 05-13-2012, 12:11 AM   #11
chucky21022002
Registered Users
 
Posts: 425
 

Join Date: Jan 2008
Location: Bedfordshire , UK
Default

Quote:
Originally Posted by tokenlefty View Post
Chucky, where did you get the boosted regulator for the fan?
I bought it from here http://www.fast-lad.co.uk/store/33-9...0-p-17599.html

Sent from my GT-I9100 using Tapatalk 2
__________________
Copter X Hybrid Fubar
Trex 500 Vbar Trex 600 Vbar
Compass 7HV HC3SX Compass 6HV Vbar
Trex 550 Vbar
chucky21022002 is online now        Reply With Quote
Reply




Unregistered
Go Back   HeliFreak > R/C Electronics Support > HobbyWing ESC's


HobbyWing ESC's HobbyWing ESC Support

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


Copyright © 2004-2011 - William James - Helifreak.com